Patent Grant
12358277
The present disclosure relates to systems and methods for preventing or minimizing printing defects.
References considered to be relevant as background to the presently disclosed subject matter are listed below:
The following patent applications/publications to the Applicant provide potentially relevant background material, acid are all incorporated herein by reference in their entirety:
Acknowledgement of the above references herein is not to be inferred as meaning that these are in any way relevant to the patentability of the presently disclosed subject matter.
The inventors of the present invention have developed a s and a method that prevents and/or minimize printing defects associated with undesired depletion of at least one ingredient used in a printing process. The ingredient was found to be of great importance to the quality of the printed image and depletion thereof significantly affected same.
In particular, the inventors of the present invention utilized a system for printing process e.g., an indirect printing process, in which a release surface of an intermediate transfer member (ITM) is pre-treated (e.g., coated) with a treatment formulation (e.g., an aqueous treatment formulation) before deposition of an ink image thereto. The treatment formulation is applied to a surface of an ITM to form thereon a thin wet treatment layer which is subjected to a drying process on the ITM release surface to leave a thin substantially dried treatment film on the ITM release surface. Then after, droplets of an aqueous ink, which comprises at least one organic polymeric resin and at least one coloring agent in an aqueous carrier, are deposited (e.g. by ink-jetting) onto the thin substantially dried treatment film to form an ink image thereon. The formed ink-image is then subjected to a drying process to leave a substantially dry ink image residue on the substantially dried treatment film. The substantially dried ink-image is then transferred, together with the thin substantially dried treatment film, from the ITM surface to a final printed substrate (e.g. foil-based, paper-based or plastic-based).
Examples of such printing processes and systems are disclosed in the aforementioned patent applications/publications to the Applicant (e.g., WO2013/132418, and WO2017/208152) which content thereof is incorporated herein by reference.
During the printing process, there is a need to refill the ink and the treatment formulations due to consumption thereof in the printing process and for the printing purpose.
The inventors of the present invention have found that the quality of the ink image which is produced in the above printing process may be reduced as the printing process proceeds. At times, the quality of the printed image may be reduced at various stages of the printing process, at times even at the very beginning of the printing process, implying that the reductions in the printing quality might not be related to the performed number of printing cycles.
Further, the inventors of the present invention have surprisingly found that the reduction in the printed image quality, which at times may be reflected in the graininess of the image, is strongly dependent on the presence of at least one ingredient in the treatment formulation. The inventors have found that in the absence of said ingredient the printed image is of very low quality.
The inventors have further found that reduction in the printing quality may not be related to the physical characteristics of the treatment formulation (e.g., viscosity and surface tension) neither to the age (freshness) of the treatment formulation or the temperature thereof.
Furthermore, the inventors of the present invention have surprisingly found that at times the refill required amounts of the treatment formulations exceed the amount which is expected based on the calculated amount of treatment formulation per printed substrate.
The inventors of the present invention have surprisingly found that the ingredient which is important to image printing quality (and as such to the performance of the printing process) may be depleted during the printing process or even when no active printing is in progress. It is noted that the depletion of said ingredient is not due to the consumption thereof in the printing process for the printing purposes but is rather a result of an undesired reaction with a contaminant which unintentionally reaches a reservoir which is holding the formulation with the aforementioned ingredient (e.g., treatment formulation). In particular, the contaminant can be originated from the ink formulation used in the printing process. The inventors have found that the contamination has significant negative effect on the quality of the formulation that comprises the aforementioned ingredient.
The aforementioned specific ingredient which is important to image printing quality and wherein depletion thereof negatively affects the printing quality is referred to herein as “a depletable chemical agent” or any lingual variation thereof e.g., “depleted chemical agent” “chemically depleted agent” etc.
To avoid reduction and/or to prevent or minimize reduction in the quality of a printed image, the inventors have developed the novel systems and processes detailed herein.
In particular, the inventors have found that in order to negate the reduction in the printing quality which is associated with insufficient quality of a treatment formulation used in an indirect printing process, there is no need to replenish the whole treatment formulation (all the ingredients thereof including a carrier). The performance of the treatment formulation may be repaired by merely adding thereto the depleted chemical agent. This provides an advantage both in terms of costs and waste reduction, rendering the disclosed systems and process more environmentally friendly.
The systems and the methods of the present invention also beneficially assures printing quality stability.
Thus, the present invention provides in one of its aspects a system for printing, comprising:
In another one of its aspects the present invention provides a method for preventing or minimizing printing defects in a printing process, wherein the printing defects are associated with a reduction in a first amount of at least one depletable chemical agent comprised within a liquid formulation (optionally in a liquid carrier), the method comprising:
In a further one of its aspects the present invention provides a method for preventing or minimizing printing defects in a printing process, the method utilizes the system described herein.
Yet, in a further one of its aspects the present invention provides a system and a process as herein described.
In order to better understand the subject matter that is disclosed herein and to exemplify how it may be carried out in practice, embodiments will now be described, by way of non-limiting example only, with reference to the accompanying drawings, in which:
The present invention is based on a novel concept of assuring quality of a printed image obtained in a printing process by replenishing a specific ingredient used in the printing process.
Thus, the present invention provides in one of its aspects a system for printing, comprising:
In another one of its aspects the present invention provides a method for preventing or minimizing printing defects in a printing process, wherein the printing defects are associated with a reduction in a first amount of at least one depletable chemical agent comprised within a liquid formulation (optionally in a liquid carrier), the method comprising:
Various embodiments will be detailed herein in connection the aforementioned aspects. It is noted that one or more embodiments which are detailed in connection with the system of the invention may also be applicable to the method of the invention mutatis mutandis and vis-versa.
In some embodiments the first amount and second amount of the depletable chemical agent in the liquid reservoir and in the replenishment reservoir, respectively, are provided in % w/w (e.g., gram of the depletable chemical agent per 100 gram of the formulation/solution it is comprised within).
Unless stated otherwise, the term “concentration” refers to a w/w—i.e. a weight of a component of a formulation/solution/dispersion (e.g., treatment formulation, printing liquid such as ink formulation and the like) per total weight of that formulation/solution/dispersion. At times, the concentration is provided in w/w % (which is interchangeable with % w/w or % by weight) i.e., a weight of a component of a formulation/solution/dispersion (e.g., treatment formulation, printing liquid such as ink formulation and the like) per 100 grain of the formulation/solution/dispersion it is comprised within.
The system and the method of the present invention are aimed to improve printing quality by negating effects associated with depletion of at least one depletable chemical agent which presence thereof in the printing process is significant to the performance of the printing process and to the quality of the resulted printed image. Unless otherwise noted, the depletion of said depletable chemical agent may be reflected in one or more of the following “reduction” scenarios which system and method of the invention are aimed to negate:
In some embodiments, the depletion of the depletable chemical agent may be reflected in a reduction in the first amount of the depletable chemical agent below a predetermined threshold value.
In some embodiments, the depletion of the depletable chemical agent may be reflected in a reduction in the functionability of the at least one depletable chemical agent.
In some embodiments, the depletion of the depletable chemical agent may be reflected in a reduction in the first amount of the depletable chemical agent relative to an amount of at least another component in the formulation.
The below disclosure further elaborates on the above detailed reduction scenarios.
Accordingly, the at least one depletable chemical agent is present in the formulation in a first amount being substantially equal to or greater than a predetermined threshold value.
The term “predetermined threshold value” is used herein in connection with an amount of the at least one depletable chemical agent in a formulation (which is being hold in a liquid reservoir) said value being equal to or less than the a first amount and denotes an essentially distinct value (namely a distinct integer ±standard deviation) predetermined based on a reference formulation with qualities that fulfill one or more of stability, functionality and compatibility (e.g., with a printing process utilizing the formulation) of the formulation. These qualities may be directly related to the quality of an image produced utilizing the formulation in a printing process.
As used herein the phrase “and/or” is to be envisaged as defining one or the other or both terms to which said phrase refers.
In accordance with the present invention, the depleted chemical agent fulfills one or more functions which, alone or in combination, are of importance to the performance of the formulation in the printing process, wherein said performance may also be reflected in the image printing quality. Thus, as used herein, the terms “functionability”, “functionality” or any lingual variations thereof used with respect to the depletable chemical agent refer to said one or more functions.
Non limiting examples of functions that the depletable chemical agent may have are one or more of affecting: solubility; wettability; viscosity; elasticity; cohesiveness; hygroscopicity; density; porosity; and tensile strength of the formulation.
Further non limiting functions of the depleted chemical agent are to provide one or more of good wettability of a surface of an ITM coated with the formulation comprising the depletable agent; good cohesiveness of the film formed on the ITM; improved quality ink image (which may be reflected in low graininess of the image); good ink wetting and ink spreading on the coated ITM characteristics. To this end, in some embodiments, the depleted chemical agent may serve as one or more of a wetting agent, a surface active agent and an anchoring agent (the latter may inter-alia serve to improve pinning of the treatment formulation to the ITM and reduce coalescence of the wet treatment coating from the ITM).
In some embodiments the function that the depletable chemical agent fulfills is being one or more of a surface active agent, a wetting agent, and an anchoring agent.
In some embodiments the function that the depletable chemical agent fulfills is providing good wettability of a surface of an ITM coated with a treatment formulation comprising the depletable agent.
The functionability of the depletable agent may be directly related to the amount thereof in the treatment formulation according to the present invention which is utilized in a printing process. Thus, at times, the reduction in the functionability of the at least one depletable chemical agent is directly related to a reduction in the first amount of the depletable chemical agent in the formulation below a predetermined threshold value.
In some embodiments, e.g., when utilized in an indirect printing process, a reduction in the functionability of the at least one depletable chemical agent and/or a reduction in the first amount of the depletable chemical agent below a predetermined threshold value are directly related to the printing quality.
In some embodiments the printing quality may be reflected in the graininess of a printed image (the lower the graininess the better the quality). To this end, the depletable chemical agent may play a function related to the graininess of the image.
In some embodiments the first amount of the depletable chemical agent may be substantially equal to or greater than the aforementioned predetermined threshold value.
In some embodiments the amount of the depletable chemical agent may be provided in weight, volume or concentration.
In some embodiments the replenishment reservoir is configured to hold only the at least one depletable chemical agent, optionally in at least one liquid carrier i.e., no other functional ingredients of the formulation in the liquid formulation are present in the replenishment reservoir and the replenishment is merely of the depletable chemical agent.
In some embodiments the at least one depletable chemical agent is present in the replenishment reservoir in a liquid form solution or dispersion, optionally in a liquid carrier being same or different from a liquid carrier present in the liquid reservoir).
In some embodiments, the replenishment reservoir and liquid reservoir may be in liquid communication (e.g., via a fluid conduit) permitting transfer (e.g., upon identifying a reduction in the first amount of the depletable chemical agent below the predetermined threshold value, or a reduction in the functionability of the at least one depletable chemical agent) of an amount (e.g., at least a portion of said second amount) of the at least one depletable chemical agent from the replenishment reservoir to the liquid reservoir.
In some embodiments, the transfer means may further comprise regulation means configured to regulate the transferred amount of the depletable chemical agent from the replenishment reservoir to the liquid reservoir and/or to avoid opposite flow of liquid from said liquid reservoir to said replenishment reservoir.
In some embodiments, the system of the invention may further comprise means (e.g., regulation means) to avoid opposite flow of liquid from the liquid reservoir to the replenishment reservoir (e.g., to avoid contamination e.g., ink contamination that may be originated from ink penetration into the liquid reservoir). In some embodiments said means comprise at least one security valve permitting one way flow of liquids, from the replenishment reservoir to the liquid reservoir. For example, the closed valve may be interposed between the liquid reservoir and the replenishment reservoir and when the closed valve is opened, it permits replenishment fluid to be transferred from the replenishment reservoir to the liquid reservoir. In some embodiments the system of the invention may further comprise means for operation of the valve to an open condition and means for closing same when the replenishment is completed e.g., when the amount of the at least one depletable chemical agent in the liquid reservoir reaches (upon said transfer) a value being equal to or greater that the aforementioned predetermined threshold value.
In some embodiments the replenishment may be considered completed when the amount of the at least one depletable chemical agent in the liquid reservoir reaches (upon said transfer) a value being below the first amount but greater than a detected/measured value that is lower than the predetermined threshold value.
In some embodiments the replenishment may be considered completed when the amount of the at least one depletable chemical agent in the liquid reservoir reaches (upon said transfer) a value being below the first amount but greater than the predetermined threshold value.
In some embodiments the second amount of the at least one depletable chemical agent in the replenishment reservoir (e.g., wt. %) may be greater than the first amount of the at least one depletable chemical agent in the liquid reservoir (e.g., wt. %) and upon transfer, dilution of the transferred portion of the depletable chemical agent occurs in the liquid reservoir.
The method and system of the invention may involve mixing of the at least one depletable chemical agent e.g., to provide homogeneity. Thus, in some embodiments the system may optionally further comprise mixing means (e.g., in one or more of the liquid reservoir and the replenishment reservoir) configured to mix (and/or homogeneously disperse) the at least one depletable chemical agent in the liquid reservoir and/or replenishment reservoir. To this end, the method of the invention may further comprise the corresponding mixing.
The system of the invention comprises transfer means configured to transfer of at least a portion of said second amount of the at least one depletable chemical agent from the replenishment reservoir to the liquid reservoir. In some embodiments the system may further comprise a metering pump for pumping a controlled amount of the depletable chemical agent from the replenishment reservoir into the liquid reservoir and optionally mixing means e.g., a mixing device, for mixing the transferred amount in the liquid reservoir.
In some embodiments according to the invention the transfer may be achieved manually e.g., by the system operator.
In some embodiments the added amount of the depletable chemical agent (present in the replenishment reservoir) may be provided in a solid form. To this end, the depletable chemical agent is present in the replenishment reservoir in a solid form and the system may optionally further comprise means to mix, dissolve (e.g., solubilize) disperse the solid depletable chemical agent e.g., in at least one liquid carrier which may be the same or different from a liquid carrier of the formulation which is comprised in the liquid reservoir. To this end, the method of the invention may further comprises mix, dissolve (e.g., solubilize) or disperse the depletable chemical agent present in the replenishment reservoir.
In some embodiments the method may further comprise mixing the at least a portion of the second amount of the at least one depletable chemical agent in the liquid formulation.
In some embodiments the method and the system may involve heating to assist in solubilizing the solid depletable agent. To this end, the system of the invention may further comprise heating means configured to assist in solubilizing the solid depletable chemical agent. To this end, the method of the invention may further comprise corresponding heating (to assist in solubilizing the solid depletable chemical agent).
In some embodiment the system and the method of the invention are for indirect printing.
In some embodiments, the system of the invention may further comprise at least one printing liquid reservoir (e.g., print bar) configured for holding a printing liquid, wherein the printing liquid optionally being an ink, further optionally a water based ink (e.g., aqueous ink formulation).
In some embodiments the system may further comprise an intermediate transfer member (ITM).
In the method and the system of the invention, in some embodiments the formulation in the liquid reservoir is a treatment formulation configured to be applied onto at least a region of a release surface of an ITM and to form a coating layer thereon (e.g., substantially as herein described).
In some embodiments the formulation is applied onto the release surface before said printing liquid (e.g., aqueous ink formulation) is applied thereon.
As used herein the term “treatment formulation” is meant that the formulation is for use with an ITM of a printing system for the purpose of treating a release surface of the ITM with said formulation. The treatment formulation may also be used for cooling in and/or cleaning the release surface of the ITM.
In some embodiments the method and the system of the invention may utilize one or more detection means (such as a detection unit) configured to identify, optionally continuously, the presence of the depletable chemical agent in the formulation e.g., treatment formulation) and to measure and/or calculate its amount in the formulation and/or calculate the percentage thereof with respect to the formulation amount or with respect to other components of the formulation. Non limiting examples of such detection means are spectroscopic means [e.g., visual (colorimetric), infrared], physical means, conductivity measurement means, pri measurement means, refractive index measurement means, density measurement means, specific gravity measurement means or any combinations thereof. The detected values (e.g., measured and/or calculated) may then can be compared with the predetermined threshold value and the amount of the depletable chemical agent is replenished when so required.
In some embodiments the detection means are selected from visual means, spectroscopic means, spectrophotometric means, electronic means, chemical means, physical means, print quality based means or any combinations thereof.
In some embodiments according to the invention the detection means are configured to measure and/or calculate a reduction in the first amount of the depletable chemical agent below a predetermined threshold value. To this end, the method of the invention may involve measuring and/or calculation said reduction.
In some embodiments according to the invention the detection means are configured to detect/measure the amount of the at least one depletable chemical agent in the liquid reservoir and the system is configured to calculate based on the detected/measured amount a reduction in the first amount of the at least one depletable chemical agent below a predetermined threshold value. To this end, the method of the invention may involve detecting/measuring and/or calculating said reduction.
In some embodiments the method of the invention further comprises identifying a reduction in the first amount of said least one depletable chemical agent below a predetermined threshold value, wherein said identifying is accomplished by detection means selected from visual means, spectroscopic means, spectrophotometric means, electronic means, chemical means, physical means, print quality based means or any combinations thereof and wherein said method further comprises calculating based on the identified reduction in said first amount of said least one depletable chemical agent the reduction in the first amount of said least one depletable chemical agent relative to an amount of another one or more components in the formulation.
In some embodiments according to the invention the detection means are configured to measure and/or calculate a reduction in the first amount of the depletable chemical agent relative to an amount of at least another component in the formulation. To this end, the method of the invention may involve measuring and/or calculating said reduction.
In some embodiments according to the invention the detection means are configured to measure and/or calculate a reduction in the functionability of said at least one depletable chemical agent. To this end, the method of the invention may involve measuring and/or calculation said reduction.
In some embodiments the system comprises means to detect, measure or calculate the concentration of the depletable chemical agent in the formulation which is comprised within the liquid reservoir and calculate therefrom the reduction in the first amount of said depletable chemical agent.
In some embodiments the method comprises detecting and/or measuring and/or calculating the concentration of the depletable chemical agent in the liquid formulation and calculate therefrom the reduction in the first amount of said depletable chemical agent.
In some embodiments according to the invention the detection means are configured to record and/or report (e.g., to a system operator) one or more of the aforementioned reductions.
In some embodiments according to the invention the detection means are configured to activate the transfer means once one or more of the aforementioned reductions have been identified.
In some embodiments according to the invention the system may further comprise a control unit configured to control replenishment of the at least one depletable chemical agent in the liquid reservoir and optionally configured to activate the transfer means once a reduction in the first amount of said depletable chemical agent below a predetermined threshold value and/or a reduction in the functionability of the at least one depletable chemical agent has been identified.
In some embodiments the control may be automatic or semi-automatic (combination of machine and human operation).
In some embodiments the transfer may be manual.
In some embodiments according to the invention the system may further comprise communication means configured to transfer data/information between the detection means to the control unit.
In some embodiments according to the invention the transfer means may be one or more of pressure based means, jetting means, spraying means or gravitational means. Other means known in the art may as well be suitable. To this end, the method of the invention may further involve utilizing same.
In some embodiments the detection means may be configured to specifically identify a reduction in the amount of the depletable chemical agent as herein disclosed based on the chemical and/or physical characteristics thereof. To this end, the method of the invention may involve quantifying the amount of the depletable chemical agent in the formulation based on the chemical and/or physical characteristics of said agent.
In some embodiments the system of the invention may further comprise a kit configured to quantify the amount of the depletable chemical agent in the formulation based on the chemical and/or physical characteristics of said agent.
In some embodiments the depletable chemical agent comprises nitrogen atoms and the detection/measurement means and/or kit are specific for detection of same.
In some embodiments the depletable chemical agent is a nitrogen containing agent (e.g., polyethylenimine) and said detection unit comprises spectroscopic means (e.g., in the visible and/or infrared) configured to detect a nitrogen containing agent based on a reaction of copper cation/salt with said nitrogen containing depletable chemical agent. To this end, the system of the invention may further comprise a kit configured to quantify the amount of the depletable chemical agent in the formulation, wherein the kit comprises a solution of copper ions and instructions for use.
In some embodiments the system and the method of the invention may further comprises sampling an aliquot from the liquid formulation for analysis (e.g., identifying/determining/measuring/calculating the amount of said at least one depletable chemical agent in the formulation). To this end, the system of the invention may further comprise at least one sampling unit configured to withdraw an aliquot of the formulation from the liquid reservoir for further analysis.
In some embodiments the sampling is performed upon demand and/or at predetermined time intervals and/or after a predetermined number of printing cycles.
In some embodiment the sampling unit is configured to withdraw an aliquot of the formulation from said liquid reservoir upon demand e.g., when low printing quality is observed and there is need to determine the amount to be replenished, and/or at predetermined time intervals and/or after a predetermined number of printing cycles.
In some embodiments the system of the invention may further comprise means to detect and/or measure and/or calculate the concentration of the depletable chemical agent in the formulation which is comprised within the liquid reservoir and calculate therefrom the reduction in the first amount of the depletable chemical agent. To this end, the method of the invention further comprises detecting and/or measuring and/or calculating the concentration of the depletable chemical agent and calculating therefrom the reduction in the first amount of the depletable chemical agent e.g., below a predetermined threshold value.
In some embodiments according to the present invention the reduction in the first amount of the depletable chemical agent may be relative to an amount of another one or more components of the formulation i.e., the amount of the another one or more components of the formulation remains constant e.g., the relative concentrations therefore in the treatment formulation, while only the concentration of the depletable chemical agent is reduced. In other words, the depletable chemical agent is the only agent that is depleted while the rest of the components maintain a constant amount e.g., wt. %, relative to each other.
In some embodiments the system of the invention is configured to identify a reduction in the first amount of the at least one depletable chemical agent relative to an amount of at least another component in the formulation. In some embodiments the system is configured to provide a signal indication, indicating the need to add said at least one depletable chemical agent to said liquid formulation to thereby reestablishing the first amount of the depletable chemical agent in said liquid formulation to be substantially equal or greater than said predetermined threshold value and hence to negate the reduction in the first amount of the at least one depletable chemical agent relative to an amount of at least another component in the formulation. In this respect, the method of the invention comprise identifying a reduction in the first amount of the at least one depletable chemical agent relative to an amount of at least another component in the formulation and adding to the formulation at least a portion of a second amount of the at least one depletable chemical agent to thereby reestablishing the first amount of the depletable chemical agent in said liquid formulation to be substantially equal or greater than the predetermined threshold value and hence to negate the reduction in the first amount of the at least one depletable chemical agent relative to an amount of at least another component in the formulation. To this end, the method may further provide a signal indication, indicating the need to add the at least one depletable chemical agent to said liquid formulation.
It is noted in this respect that the depletion of the depletable chemical agent is to be envisaged as one not being due to consumption of the depletable chemical agent for the printing process purposes e.g., consumption of the treatment solution for the purpose of coating the ITM). In the printing process the depletable chemical agent is being consumed e.g., in a controlled manner according to a predetermined program, together with the other components of the formulation. Thus, the relative amount of the depletable chemical agent with respect to the amounts of the other components of the formulation is to be maintained substantially constant during the printing process. Once depletion of the depleted chemical agent occurs (e.g., due to ink contamination) the aforementioned relative amount varies according to the extent of the depletion. The system and method of the invention are utilized to counteract such a depletion by adding a further amount of the depletable agent to repair the depletion thereof, and as such minimize the negative effect associate with such a depletion (e.g., reduction in the printing quality).
In some embodiments, in the method and system of the invention, upon identifying a reduction in the first amount of the depletable chemical agent below the aforementioned predetermined threshold value e.g., a desired amount of the at least one depletable chemical agent is added to the liquid formulation e.g., to reestablishing the first amount of the depletable chemical agent in the liquid formulation or at least to increase the amount to be equal or above the predetermined threshold value. The addition may be provided in a predetermined profile referred to herein as a predetermined replenishment profile.
In some embodiments the predetermined replenishment profile is selected to increase the amount of the depletable chemical agent to reach a value being substantially equal to or greater than the aforementioned predetermined threshold value, or at times to reach any other predetermined value that is below/above the predetermined threshold value.
To this end, the system of the invention may further comprise a control unit configured to control replenishment of the at least one depletable chemical agent in the liquid reservoir, in accordance with said replenishment profile.
Reference is now made to
One example of such transfer unit 106 is a fluid conduit permitting transfer of an amount of the at least one depletable chemical agent from the replenishment reservoir 104 to the liquid reservoir 102. To this end, the system optionally further comprises a security valve configured to avoid opposite flow of liquid from the liquid reservoir 102 to the replenishment reservoir 104.
In
The system may further comprise a sampling unit (not shown in
The system optionally further comprises a control unit 110 configured to control replenishment of the at least one depletable chemical agent in the liquid reservoir 102, by activating the transfer of an amount of the depletable chemical agent from the replenishment reservoir 104 to the liquid reservoir 102.
The control unit 110 can control the replenishment upon demand, e.g. based on a feedback from the detection unit and/or can periodically activate the replenishment based on a predetermined replenishment profile (e.g. a predetermined amount of the depletable chemical agent once in a predetermined period of time).
In some embodiments the system 100 in
In some embodiments the system of the invention, e.g., system 100 in
In some embodiments the system of the invention may further comprise a processing utility.
In some embodiments the processing utility may be configured, upon identifying a reduction in the first amount of the depletable chemical agent below the aforementioned predetermined threshold value and/or upon identifying a reduction in the functionability of the at least one depletable chemical agent (which may be reflected in the quality of a printed image), to provide a user (e.g., a system operator) with a signal indication, indicating the need to replenish the at least one depletable chemical agent in the liquid reservoir.
In some embodiments the signal indicator may be a visual signal, an audio signal or a combination thereof.
In some embodiments replenishment may be performed by the user e.g., according to a profile to be determined based on the printing conditions, optionally according to a predetermined replenishment profile, or may be automatically performed by the control unit e.g., upon approval by the system operator e.g., by activating the controller e.g., ON/OFF switch, e.g., according to a predetermined replenishment profile.
In some embodiments the system may optionally further comprise means to halt the printing process and resume same once replenishment is accomplished/completed.
In some embodiments the replenishment profile may define one or more of: the amount (e.g., volume) of the at least one depletable chemical agent to be transferred from the replenishment reservoir to the liquid reservoir; the frequency of the replenishment, the duration of the transfer; the manner of the transfer (e.g., being continuous or sequential); the transfer rate.
In some embodiments the replenishment profile may be determined based on one or more of: the first amount and/or the second amount of the depletable chemical agent; the extent of said reduction; detected reduction (e.g., the amount of the depletable chemical agent remained in the liquid reservoir after the reduction); the relative amount of the depletable chemical agent with respect to the formulation amount or the amount of other one of more components comprised within the formulation.
In some embodiments the replenishment profile may be defined based on one or more of the printing conditions e.g the nature of the printing medium, printing time/duration, number of printing cycles, number or printed pages, printing temperature/s, printing rate, the quality/age of the formulation, the quality/age of the ITM, extent of contamination of the formulation by external contaminants, such as ink.
In some embodiments the system and the method of the invention further comprise processing an image produced by the printing process and assess the image printing quality thereof, wherein when said image printing quality is below a predetermined required quality, replenishment/addition of the depletable chemical agent in the liquid formulation is required (thus, addition of the at least a portion of the second amount of the at least one depletable chemical agent to thee liquid formulation is performed). To this end, the system of the invention utilizes the processing utility which is configured to process the image and to assess the printing quality thereof, wherein when the image printing quality is below a predetermined required quality, the control unit of the system is configured to control replenishment of the at least one depletable chemical agent in the liquid reservoir.
In some embodiments the method and the system of the invention generate an output indicative of the quality of the image, wherein when the output is below a predetermined threshold parameter, replenishment/addition of the depletable chemical agent in the liquid formulation is required (thus, addition of the at least a portion of the second amount of the at least one depletable chemical agent to thee liquid formulation is performed). To this end, the system of the invention utilizes the processing utility which is configured to generate said output and wherein when said output is below a predetermined threshold parameter the control unit is configured to control or cause replenishment of said at least one depletable chemical agent in said liquid reservoir.
In some embodiments the image printing quality is determined based on the graininess of the image (the lower the graininess the better the quality). To this end, the output reflects a value indicative of the graininess of the image.
In some embodiments the system and method of the invention display said output on visual display unit, an audio device or combination of same. To this end, the system of the invention may further comprise a display unit.
In some embodiments the predetermined threshold parameter comprises an essentially distinct value or a range of values representing a desired quality of the printed image (e.g., the printing quality may be determined based on one or more image pixels, the threshold parameter being a distinct value of one pixel, an average of some pixels or a range of values of the various pixels).
In some embodiments, when the output is below a predetermined threshold value (e.g., indicating a defective image), the system of the invention is configured to provide, and the method provides an alert to the user and at times, automatically stop the printing process and optionally resume same once replenishment of the depletable chemical agent (in the liquid reservoir) is completed.
In some embodiments the system of the invention may further comprise a user interface. At times the user interface may be for allowing a user to introduce into the processing utility one or more desired printing conditions for a printing process.
In some embodiments the system of the invention may further comprise a memory comprising a database of image quality predetermined threshold parameter/s of a printing processes.
In some embodiments the processing utility is configured to correlate the image quality predetermined threshold parameter from the database to the output generated in a printing process.
In some embodiments the system of the invention may further comprise means to record the replenishment history. To this end, the system may be configured to record and optionally store in a memory the replenishment occurrences. The system may be further configured to determine based on the latter the quality of the treatment formulation and in case wherein a predetermined certain amount of replenishment cycles and/or certain amount of the depletable chemical agent was replenished and/or certain amount of the depletable chemical agent in the replenishment reservoir was consumed, to halt the printing process and/or provide an indication to the user regarding the replenishment history, optionally followed by decision making by the user (or automatically/semi automatically) to proceed with further replenishment or to discard the formulation in the liquid reservoir (when the quality thereof is insufficient e.g., due to a great number of replenishment cycles that exceed a predetermined replenishment cycles number) and fill it with a new (fresh) formulation.
In some embodiments the reduction in the first amount of the depletable chemical agent or a reduction in the functionability of the at least one depletable chemical agent may be due to an undesired side reaction of the depletable chemical agent.
In some embodiments the undesired side reaction of the depletable chemical agent results with a formation of an undesirable byproduct.
As used herein the term “undesirable byproduct” refers to a byproduct produced upon reaction of at least one ingredient that does not form part or fulfill any functionality in the treatment formulation, with the depletable chemical agent, the byproduct having no functionality in the formulation e.g., in the treatment formulation and/or in the printing process.
In some embodiments the system and the method of the invention may further comprise detection of the formation of the undesirable byproduct and optionally measure the amount thereof. To this end, the system of the invention may further comprise means to detect same and to measure/determine/calculate the amount of the byproduct in the liquid reservoir.
In some embodiments the method and system of the invention may further comprise correlating between the detected formation of the undesirable byproduct and the reduction in the first amount of the depletable chemical agent. To this end, the system of the invention may further comprise means configured to correlate between the detected formation of the undesirable byproduct and the reduction in the first amount of the depletable chemical agent. In some embodiments the system may further comprise means configured to calculate from the amount of the undesirable byproduct in the liquid reservoir the reduction in the first amount of the depletable chemical agent.
In some embodiments reduction in the first amount of the depletable chemical agent may be due to contamination of the formulation (in the liquid reservoir) with at least one contaminant and formation of at least one undesired byproduct resulted from interaction (which may be reversible interaction or irreversible interaction) between the at least one depletable chemical agent and at least one contaminant.
In some embodiments the method and the system of the invention are for printing. To this end, the system further comprises at least one printing liquid reservoir (e.g., an ink reservoir) configured for holding a printing liquid (e.g., and ink formulation) and wherein the reduction in the first amount of the depletable chemical agent being due to printing liquid contamination (e.g., ink contamination) in the liquid reservoir holding the treatment formulation according to the invention (e.g., entrance of ink components into the liquid reservoir which holds a treatment formulation with the depletable chemical agent).
In some embodiments the system of the invention may further comprise means to remove ink image residue or treatment formulation residue from the release layer surface of the ITM and recycle the treatment formulation residue (to the liquid reservoir). To this end, the system of the invention may further comprise one or more of:
In some embodiments the ink contamination is originated from the recycling of the treatment formulation residue.
In some embodiments the ink contamination may be due to one or more of: ink spill; ink splash (e.g., from an ink jet nozzle); insufficient removal of the ink image residue; present of ink residues in the recycled treatment formulation residue (e.g., due to insufficient transfer of the ink from the ITM to a final substrate).
In some embodiments the ink contamination may be due to one or more of ink spill, ink splash and recycling process of the treatment formulation.
In some embodiments the ink contamination may be due to recycling process of the treatment formulation.
At times, the ink contamination may increase with increased printing cycles due to undesired buildup of ink contamination.
In some embodiments the printing liquid is an ink (e.g., an ink formulation) that comprises at least one binder (e.g., a negatively charged organic polymeric resin) and at least one colorant (e.g., coloring agent consists of pigment) and wherein the reduction in the first amount of the depletable chemical agent or the reduction in the functionability of the at least one depletable chemical agent being due to an undesired side reaction of the depletable chemical agent with the at least one hinder to form an undesirable byproduct (in the liquid reservoir holding the treatment formulation according to the invention).
In some embodiments, in the system according to the invention, the replenishment reservoir is positioned sufficiently remote (sufficiently spaced apart) from the at least one ink reservoir (e.g., print bar) to avoid effects of ink contamination of the replenishment reservoir (e.g., due to ink splash/spill).
In some embodiments the system of the invention may further comprise a protecting unit configured to protect the liquid reservoir (holding the treatment formulation of the invention) from contamination ink contamination. To this end, the method of the invention further comprises protecting the liquid formulation from contamination.
In some embodiments the protecting unit may selectively trap one or more ink components utilizing selective filters e.g., that chemically interact with the one or more ink components e.g., binder. The protecting unit may be positioned downstream or at close proximity to the opening of the liquid reservoir or at the opening of the liquid reservoir. To this end, the system may further comprise connecting means configured to connect the protecting unit to the liquid reservoir. The system may further utilize same protecting unit to protect the replenishment reservoir.
In some embodiments the method and system of the invention may further comprise removal of the undesired byproduct. To this end, the system of the invention may further comprise means configured to remove said byproduct (e.g., once formed and/or once detected) from said liquid reservoir. Such means may enable further performance of the treatment formulation and optionally avoid undesired side effects associate with said byproduct e.g., clogging one or more of the system components/units.
Non limiting examples of means to remove the undesired by products are one or more of: filtration e.g., wherein the byproduct is a solid or semi solid which may be physically filtered out from the liquid treatment formulation; phase separation e.g., in cases wherein the byproduct forms a different phase such as a gel that forms a separate phase from the liquid formulation; circulation optionally followed by decantation of the liquid components (solution) and discarding the byproduct e.g., in cases wherein the byproduct is a solid product, and recirculation of the liquid components to the liquid reservoir.
In some embodiments the method and system of the invention further comprise measurement of the volume of the liquid formulation (in said liquid reservoir), wherein when the measured volume is below a predetermined minimum volume, the printing process is halted and refill of the liquid formulation with an additional volume of the liquid formulation to reach a volume being substantially equal or above said predetermined minimum volume. To this end, the system of the invention may further comprise measuring means configured to measure the volume of the liquid in said liquid reservoir and the system (e.g., the control unit or the processing unit) is configured to indicate to a user to refill the liquid reservoir with a new liquid formulation. Similarly, the system of the invention may further comprise measuring means configured to measure the amount (e.g., volume/liquid or weight/solid) of the depletable chemical agent in the replenishment reservoir, wherein when the measured amount is below a predetermined minimum amount the control unit is configured to indicate to a user to refill the replenishment reservoir with an additional amount (volume/weight) of the depletable chemical agent.
As described above, the system of the invention comprises several units. As appreciated by those versed in the art, these units may communicate using wired or wireless communication module.
In some embodiments the depletable chemical agent may be a polymeric agent containing amine nitrogen atoms in a plurality of functional groups which need not be the same and can be combined (e.g. primary, secondary, tertiary amines or quaternary ammonium salts which may be linear, branched or cyclic).
In some embodiments the depletable chemical agent may be a polymeric agent having a relatively high charge density.
In some embodiments the depletable chemical agent may be a polymeric agent having molecular weight equals or greater than 10,000 g/mole.
In some embodiments the depletable chemical agent may be a polymeric agent having at least one of (a) a positive charge density of at least 3 meq/g of said agent and an average molecular weight of at least 5,000, (b) a positive charge density of at least 6 meq/g of said agent and an average molecular weight of at least 1,000, (c) a nitrogen content of at least 1 wt. % and an average molecular weight of at least 50,000, and (d) a nitrogen content of at least 18 wt. % and an average molecular weight of at least 10,000.
In some embodiments the depletable chemical agent may be a polymeric agent having:
(2) a nitrogen content of at least 18 wt. % and an average molecular weight of at least 10,000.
In some embodiments the depletable chemical agent may be a polymeric agent having a positive charge density.
In some embodiments the positive charge density may be at least 0.5 meq/g, at least 1 meq/g, at least 2 meq/g, at least 3 meq/g, at least 4 meq/g, at least 5 meq/g, 6 meq/g, at least 7 meq/g, at least 8 meq/g, at least 9 meq/g, at least 10 meq/g, at least 11 meq/g, at least 12 meq/g, at least 13 meq/g, at least 14 meq/g, at least meq/g, at least 16 meq/g, at least 17 meq/g, at least 18 meq/g, at least 19 meq/g, or at least 20 meq/g of said agent.
In some embodiments the depletable chemical agent may be a polymeric agent having an average molecular weight of at least 500, at least 800, at least 1,000, at least 1,300, at least 1,700, at least 2,000, at least 2,500, at least 3,000, at least 3.500, at least 4,000, at least 4,500, at least 5,000, at least 10,000, at least 15,000, at least 20,000, at least 25,000, at least 50,000, at least 100,000, at least 150,000, at least 200,000, at least 250,000, at least 500,000, at least 750,000, at least 1,000,000, or at least 2,000,000.
In some embodiments the depletable chemical agent may be a polymeric agent having an average molecular weight of at least 2,000, at least 10,000 or at least 25,000.
In some embodiments the depletable chemical agent may be a polymeric agent comprising one or more positively chargeable nitrogen atoms.
As used herein the terms a “positively chargeable polymer” or “positively chargeable group” is meant a polymer or chemical moiety which either can readily add a proton (e.g. —NH2) or has a permanent positive charge (e.g. —N(CH3)3+). In some embodiments these terms refer to an inherent property of the polymer or moiety, and thus may encompass polymers or moieties which are in an environment in which such protons are added, as well as polymers in an environment in which such protons are not added. In contrast, the term “a positively charged” polymer or group refers to a polymer or group in an environment in which one or more such protons have been added or which has a permanent positive charge. In some embodiments, the one or more chargeable nitrogen atoms of the depletable chemical agent are selected from the group of primary, secondary and tertiary amines and quaternary ammonium groups and combinations of such groups. In some embodiments, such groups are covalently hound to a polymeric backbone and/or constitute part of such a backbone. In some embodiments the one or more nitrogen atoms are part of a cyclic moiety.
In some embodiments the one or more nitrogen atoms constitute at least 1%, at least 1.4%, at least 2%, at least 5%, at least 8%, at least 10%, at least 15%, at least 18%, at least 20%, at least 24%, at least 30%, at least 35%, at least 40%, at least 45%, or at least 50% by weight of the depletable chemical agent.
In some embodiments the depletable chemical agent is a polymeric agent that includes poly(diallyldimethylammonium chloride)
unit.
In some embodiments the depletable chemical agent is a polymeric agent that includes polyallylamine
unit.
In some embodiments the depletable chemical agent is a polymeric agent that includes poly(4-vinylpyridine)
unit.
In some embodiments the depletable chemical polymeric agent is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethyammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer (Viviprint 131), a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer (Viviprint 200), a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate (Viviprint 650), a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride.
In some embodiments the depletable chemical polymeric agent is polyethyleneimine (PFI) (e.g., Loxanol P, Loxanol MI 6730)
In some embodiments the concentration (e.g., the first amount) of the depletable chemical polymeric agent in the formulation (in the liquid reservoir) is equal to or less than about 5 wt. %, 4 wt %, 3 wt. %, 2 wt. %, 1 wt. %, 0.5 wt. %, 0.4 wt. %, 0.3 wt. %, 0.2 wt. %, 0.1 wt. %, or equals to or being at least about 0.01 wt. %, at time at least about 0.05%.
In some embodiments the depletable chemical agent is PEI and the first amount thereof is a concentration, by weight, in the formulation (in the liquid reservoir), is at least 0.01%, at least 0.05%, at least 0.10%, at least 0.15% or at least 0.20%.
In some embodiments the depletable chemical agent is PEI and the predetermined threshold value is a concentration, by weight, in the formulation (in the liquid reservoir), being at least 0.01%, at least 0.05%, at least 0.10%, at least 0.15% or at least 0.20%.
In some non-limiting embodiments according to the invention, the first amount of the PEI (in the liquid reservoir) may be 0.25% concentration, by weight, in the treatment formulation (for example 0.75 gr PEI in a liquid reservoir holding 300 L of the treatment formulation). The second amount of the PEI (in the replenishment reservoir) may be 25 wt. % (e.g., in water). When the first amount of the PEI (in the liquid reservoir) is reduced below a predetermined threshold value e.g., 0.01 wt. % (e.g., below said value the PEI no longer fulfill its functionability in the printing process), the method and the system of the invention is configured to transfer a portion of the second amount of the PEI, from the replenishment reservoir to the liquid reservoir, to thereby replenish the amount of the PEI (in the liquid reservoir) to a value being equal to or above the predetermined threshold value e.g., a value being equal to 0.01 wt. % or above 0.01 wt. %, or to replenish the amount of the PEI (in the liquid reservoir) to a value being equal to the first amount e.g., 0.25 wt. % (the latter is an example of a required ×100 dilution of the PEI while being transferred from the replenishment reservoir to the liquid reservoir i.e., transfer of 3 L of the replenishment 25 wt. % solution to the 300 L liquid formulation of the liquid reservoir).
In some embodiments the depletable chemical agent PEI and the first amount thereof is a concentration, by weight, in the formulation (in the liquid reservoir), being at most 6%, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2.0%.
In some embodiments the depletable chemical agent is PEI and the first amount thereof is a concentration, by weight, in the formulation (in the liquid reservoir), being range of 0.01 to 1%, 0.01 to 0.8%, 0.01 to 0.7%, 0.01 to 0.6%, 0.1 to 0.5%, 0.2 to 0.7%, 0.2 to 0.6%, or 0.2 to 0.5%.
In some embodiments the PEI has an average molecular weight of at least 20,000, at least 50000, at least 100,000, at least 200,000, at least 350,000, at least 500,000, at least 700,000, at least 750,000 and optionally, at most 3,000,000, at most 2,500,000, or at most 2,000,000.
In some embodiments the PEI has an average molecular weight of 750,000
In some embodiments the depletable chemical agent is a polymeric agent being PEI, and wherein said PEI is a surface active agent, a wetting agent, an anchoring agent or any combination thereof.
In some embodiments the PEI is a surface active agent.
In some embodiments the PEI is a wetting agent.
In some embodiments the PEI is an anchoring agent.
In some embodiments the charge densities of the PEI polymer is in the range of 16-20 meq/g of material.
In some embodiments the PEI has a charge density of 8 meq/g.
In some embodiments the depletable chemical agent is silicone functionalized PEI [e.g., X 22 3939A (Shin Edsu.)], the silicon function being of the following structure:
In some embodiments the depletable chemical agent is a quaternary ammonium compound.
In some embodiments the quaternary ammonium compound is Larostat2641A (BASF).
In some embodiments the quaternary ammonium compound is Foamquat SAQ (Linoleamidopropyl Ethyldimonium Ethosulfate 90).
In some embodiments the depletable chemical agent is water dispersible (e.g., polymeric water dispersible).
In some embodiments the depletable chemical agent is water soluble (e.g., water soluble polymer).
In some embodiments the depletable chemical agent is solid at room temperature.
In some embodiments the least one binder in the ink formulation is an anionic binder e.g., an acrylic binder and/or a sulfonic binder. Similar anionic binder are within the scope of the present invention.
In some embodiments the at least one binder in the ink formulation is a negatively charged organic polymeric resin.
In some embodiments the average molecular weight of the negatively charged organic polymeric resin is at least 8,000.
In some embodiments the at least one binder in the ink formulation is an acrylic polymer and/or an acrylic-styrene co-polymer (e.g., with an average molecular weight around 60,000 g/mole).
In some embodiments the at least one binder in the ink formulation is Joncryl® 538 BASF.
In some embodiments the depletable chemical agent is PEI and the reduction in the first amount thereof being due an undesired side reaction thereof with said at least one basic binder e.g., having COO— or SOOO— groups as side chains.
In some embodiments the formulation (in the liquid reservoir) may further comprise at least one competing ingredient which is inert with respect to printing process i.e., possess no functionality in the printing process per-se, wherein the competing agent is selected to rapidly interact (relative to the depletable chemical agent) with the ink one or more contaminating ingredient (e.g., binder), thereby prevent or minimize the depletion of the depletable chemical agent e.g., PEI due to interaction of the competing ingredient (and not the depletable chemical agent) with the contaminating ink ingredients (e.g., ink binder). Non limiting example of such competing ingredient is a poly-anionic material.
To this end, in some embodiments the system may further comprise means to remove the product produced between the at least one competing ingredient and the one or more contaminating ink ingredient.
In some embodiments the system of the invention is for indirect printing, wherein the system further comprises:
In some embodiments the printing liquid is an ink which is optionally applied by jetting and the system further comprises:
In some embodiments the method in the method of the invention the liquid formulation is configured to be applied on a substrate on which an image is to be printed or on an intermediate transfer member in an indirect printing process.
In some embodiments the method of the invention is utilized in an indirect printing process, wherein the method further comprises:
In some embodiments the printing liquid is an ink, optionally an aqueous ink and the method further comprises:
As used herein the term “blanket” refers to a flexible transfer member that can be mounted within a printing device to form a belt-like structure on two or more rollers, at least one of which is able to rotate and move the blanket (e.g. by moving the belt thereof) to travel around the rollers.
As used herein, the terms “blanket” and “intermediate transfer member” (ITM) are used interchangeably and refer to a flexible member comprising at least a release layer used as an intermediate member configured to receive an ink image and to transfer the ink image to a target substrate, as detail herein.
In an operative mode, image forming station 14 is configured to form a mirror ink image, also referred to herein as “an ink image” (not shown), of a digital image on an upper run of a surface of blanket 12. Subsequently the ink image is transferred to a target substrate, (e.g., a paper, a folding carton, or any suitable flexible package in a form of sheets or continuous web) located under a lower run of blanket 12.
As used herein, the terms “ink image” and “image” are interchangeable. At times, said terms refer to a printed image formed on blanket 12 and transferred to a target substrate. At times they refer to the an image on the substrate itself (e.g., a paper, a folding carton, or any suitable flexible package in a form of sheets or continuous web). Thus, these terms should be interpreted in the context of the text in which they are used.
As used herein, the term “run” refers to a length or segment of blanket 12 between any two given rollers over which blanket 12 is guided.
In some embodiments, during installation blanket 12 may be adhered (e.g., seamed) edge to edge to form a continuous blanket loop (not shown). An example of a method and a system for the installation of the seam is described in detail in U.S. Provisional Application 62/532,400, the disclosure thereof is incorporated herein by reference.
In some embodiments, image forming station 14 typically comprises multiple print bars 22, each mounted (e.g., using a slider) on a frame (not shown) positioned at a fixed height above the surface of the upper run of blanket 12. In some embodiments, each print bar 22 comprises a strip of print heads as wide as the printing area on blanket 12 and comprises individually controllable print nozzles.
In some embodiments, image forming station 14 may comprise any suitable number of bars 22, each bar 22 may contain a printing fluid, such as an aqueous ink of a different color. The ink typically has visible colors, such as but not limited to cyan, magenta, red, green, blue, yellow, black and white. In the example of
In some embodiments, the print heads are configured to jet ink droplets of the different colors onto the surface of blanket 12 so as to form the ink image (not shown) on the surface of blanket 12.
In some embodiments, different print bars 22 are spaced from one another along the movement axis of blanket 12, represented by an arrow 24. In this configuration, accurate spacing between bars 22, and synchronization between directing the droplets of the ink of each bar 22 and moving blanket 12 are essential for enabling correct placement of the image pattern.
In some embodiments, system 10 comprises heaters, such as hot gas or air blowers 26, which are positioned in between print bars 22, and are configured to partially dry the ink droplets deposited on the surface of blanket 12.
This hot air flow between the print bars may assist, for example, in reducing condensation at the surface of the print heads and/or in handling satellites (e.g., residues or small droplets distributed around the main ink droplet), and/or in preventing blockage of the inkjet nozzles of the print heads, and/or in preventing the droplets of different color inks on blanket 12 from undesirably merging into one another. In some embodiments, system 10 comprises a drying station 16, configured to blow hot air (or another gas) onto the surface of blanket 12. In some embodiments, drying station comprises air blowers or any other suitable drying apparatus.
In drying station 16, the ink image formed on blanket 12 is exposed to radiation and/or to hot air in order to dry the ink more thoroughly, evaporating most or all of the liquid carrier and leaving behind only a layer of resin and coloring agent which is heated to the point of being rendered tacky ink film.
In some embodiments, system 10 comprises a blanket transportation assembly 26, configured to move a rolling ITM, such as a blanket 12. In some embodiments, blanket transportation assembly 26 comprises one or more rollers 28, wherein at least one of rollers 28 comprises an encoder (not shown), which is configured to record the position of blanket 12, so as to control the position of a section of blanket 12 relative to a respective print bar 22. In some embodiments, the encoder of roller 28 typically comprises a rotary encoder configured to produce rotary-based position signals indicative of an angular displacement of the respective roller.
Additionally or alternatively, blanket 12 may comprise an integrated encoder (not shown) for controlling the operation of various modules of system 10. The integrated encoder is described in detail, for example, in U.S. Provisional Application 62/689,852, the disclosure of which is incorporated herein by reference.
In some embodiments, system 10 comprises an impression station 18, wherein blanket 12 passes between an impression cylinder and a pressure cylinder 32, which is configured to carry a compressible blanket.
In some embodiments, system 10 comprises a control console (not shown), which is configured to control multiple modules and assemblies of system 10.
In some embodiments, blanket treatment station 20, which can also serve as a cooling station, is configured to treat the blanket by, for example, cooling it and/or applying a treatment fluid to the outer surface of blanket 12, and/or cleaning the outer surface of blanket 12. The treatment may be carried out by passing blanket 12 over one or more rollers or blades configured for applying cooling and/or cleaning and/or treatment fluid on the outer surface of the blanket.
In the example of
In some embodiments the liquid reservoir of the system of the invention forms part of station 20.
In some embodiments the replenishment reservoir of the system of the invention forms part of station 20.
In some embodiments, impression cylinder 30 of impression station 18, is configured to impress the ink image onto the target substrate, such as an individual sheet 34, conveyed by substrate transport module 36 (schematically shown) from an input stack 38 to an output stack 40 via impression cylinder 30. In some embodiments, the target substrate may comprise any suitable substrate, such as but not limited to a flexible substrate, a partially flexible substrate (e.g., having flexible sections and rigid sections or a rigid substrate.
In some embodiments, system 10 comprises an additional impression station (not shown), so as to permit duplex printing (i.e., printing on both sides of sheet 34).
In alternative embodiments, a different configuration of substrate conveyor 36 may be used for printing on a continuous web substrate. Detailed descriptions and various configurations of sheet-fed simplex and duplex printing systems and of systems for printing on continuous web substrates are provided, for example, in U.S. Pat. Nos. 9,914,316 and 9,186,884, in PCT International Publication WO2013/132424, in U.S. Patent Application Publication 2015/0054865, and in U.S. Provisional Application 62/596,926, the disclosure of each is incorporated herein by reference.
The particular configurations of system 10 are shown by way of example. Embodiments of the present invention, however, are by no means limited to this specific sort of example systems, and the principles described herein may similarly be applied to any other sorts of printing systems.
In some embodiments the formulation e.g., treatment formulation (in the liquid reservoir) may further comprise one or more of (a) at least one water soluble polymer; (b) at least one surfactant; (c) at least one humectant and (d) at least one wetting agent.
In some embodiments the formulation e.g., treatment formulation (in the liquid reservoir) may further comprise least one particulate material selected from (i) at least one thermoplastic polymeric particulate material; (ii) at least one thermosetting polymeric particulate material; or (iii) a combination thereof.
As used herein the term “thermosetting polymeric particulate material” or any lingual variations thereof refers to a particulate material which a is polymeric material (e.g., having relatively high molecular wright) that becomes irreversibly hardened upon being cured e.g., by the action of heat or suitable radiation). Once hardened this material cannot be re-melted.
Non limiting examples of thermosetting polymeric particulate material are polytetrafluoroethylene (PTFE), perfluoroalkoxy alkane (PEA) or fluorinated ethylene propylene (FEP).
In some embodiments the thermosetting polymeric particulate material is PTFE.
As used herein the term “thermoplastic polymeric particulate material” or any lingual variations thereof refers to a particulate material which is a polymeric material (e.g., having relatively high molecular weight) that becomes pliable or moldable above a specific temperature and solidifies upon cooling. This material can be re-melted and reshaped.
Non limiting examples of thermoplastic polymeric particulate material are wax particulate materials.
In some embodiments the wax particulate materials is an oxidized polyethylene wax particulate material.
In some embodiments the wax particulate material is a coated wax particulate material.
In some embodiments the coated wax particulate material is a wax particulate material coated with silicon dioxide.
Treatment formulations comprising such particulate materials are disclosed in the U.S. Provisional Application No. 62/787,984, U.S. Provisional Application No. 62,825,568 and International Application No. PCT/IB2020/050001, the content of each is incorporated herein by reference.
In some embodiments the formulation e.g., treatment formulation (in the liquid reservoir) may further comprise at least one modified polysaccharide (e.g., cellulose derivative, cellulose ether, methylcellulose and hydroxypropyl methylcellulose).
As used herein the term “modified polysaccharide” refers to polymeric carbohydrate molecule composed of long chains of monosaccharide units bound together by glycosidic linkages wherein at least one of the hydrogen atoms of the hydroxyl groups in the monosaccharide unit is replaced with another group e.g., R.
Treatment formulations comprising such modified polysaccharides are disclosed in U.S. Provisional Application No. 62/790,890, U.S. Provisional Application No. 62,825,568 and International Application No. PCT/M2020/050001, the content of each is incorporated herein by reference.
In some embodiments the formulation (in the liquid reservoir) optionally may further comprise at least one antibacterial agent.
In some embodiments the formulation e.g., the treatment formulation (in the liquid reservoir) comprises:
In some embodiments the water soluble polymer may be at least one modified polysaccharide (e.g., cellulose derivative, cellulose ether, methylcellulose and hydroxypropyl methylcellulose).
In some embodiments the modified polysaccharide is hydroxypropyl methylcellulose.
In some embodiments the water soluble polymer may be selected from the group consisting of polyvinyl alcohol, water-soluble cellulose, polyvinylpyrrolidone (PVP), polyethylene oxide, and water-soluble acrylates.
In some embodiments the water soluble polymer may be Polyethylene oxide chain (PEO) or polypropylene oxide chain (PPO) based polymer.
In some embodiments the concentration of the water soluble polymer in formulation (in the liquid reservoir) may be within a range of 0.5 to 8%, 2.5 to 6.5%, 2.5 to 6%, 2.5 to 5.5%, or 2.5 to 5%, optionally being of at most 10% or at most 8% or at most 6% or at most 5%.
In some embodiments the solubility in water of the at least one water soluble polymer (in the liquid reservoir), at 25° C., is at least 2%, at least 7%, at least 10%, at least 12%, at least 15%, at least 20%, or at least 25%, and optionally, at most 80% or at most 60%.
In some embodiments the surfactant may be a non-ionic surfactant e.g., a non-ionic silicone-containing surfactant.
In some embodiments the formulation (in the liquid reservoir) has a total surfactant concentration of at least 0.3%, at least 0.5%, at least 0.75%, at least 1%, at least 2%, at least 3%, at least 4%, at least 5%, at least 6%, at least 7%, at least 8%, at least 9%, at least 10%, at least 11%, at least 12% and optionally, within a range of 6 to 40%, 6 to 30%, 6 to 20%, 7 to 30%, 7 to 20%, 7 to 15%, 8 to 25%, 8 to 20%, 8 to 15%, 8 to 13%, 9 to 25%, 9 to 20%, 9 to 15%, 9 to 13%, 10 to 25%, 10 to 20%. 10 to 15%, or 10 to 13%.
In some embodiments the formulation the liquid reservoir) contains at least 6%, at least 7%, at least 8%, at least 9%, or at least 10%, by weight, of the non-ionic surfactant.
In some embodiments the formulation (in the liquid reservoir) contains at most 18%, at most 16%, at most 15%, at most 14%, or at most 13%, by weight, of the non-ionic surfactant.
In some embodiments the concentration of the non-ionic surfactant within the formulation (in the liquid reservoir), by weight, is within a range of 0.5%-18%, 1-18%, 2-16%, 6.5-18%, 6.5-16%, 7.5-18%, 7.5-16%, 8.5-18%, 8.5-16%, 9.5-18%, 9.5-16%, 10.5-18%, or 10.5-16%.
In some embodiments the solubility in water of the non-ionic surfactant, at 25° C., is at least 2%, at least 8%, at least 10%, at least 12%, at least 15%, at least 20%, at least 25%, or at least 30%, and optionally, at most 80% or at most 60%.
In some embodiments the non-ionic surfactant is a polyethoxylated sorbitan ester.
In some embodiments, the polyethoxylated sorbitan ester includes at least one species or at least two species selected from the group consisting of PEG-4 sorbitan monolaurate, PEG-20 sorbitan monolaurate, PEG-20 sorbitan monopalmitate, PEG-20 sorbitan monostearate, and PEG-20 sorbitan monooleate.
In some embodiments an HLB number of said non-ionic surfactant is at least 11, at least 12, at least 13, at least 14, or at least 14.5, and optionally, at most 22, at most 21, at most 20, at most 19, at most 18, or at most 17, and further optionally, within a range of 11 to 25, 11 to 23, 11.5 to 21, 11.5 to 20, 11.5 to 18, 12.5 to 21, 12.5 to 20, 12.5 to 18, 13.5 to 21, 13.5 to 20, 13.5 to 18, 14 to 20.5, 14 to 18.5, 14.5 to 20, 14.5 to 19, 14.5 to 18, or 14.5 to 17.5.
In some embodiments the formulation the liquid reservoir) gins at least 6%, at least 7%, at least 8%, at least 9%, or at least 10%, by weight, of c non-ionic surfactant.
In some embodiments the formulation (in the liquid reservoir) contains at most 18%, at most 16%, at most 15%, at most 14%, or at most 13%, by weight, of the non-ionic surfactant.
In some embodiments the non-ionic surfactant n the formulation (in the liquid reservoir), by weight, is within a range of 2-18%, 5.5-18%, 5.5-16%, 6.5-18%, 6.5-16%, 7.5-18%, 7.5-16%, 8.5-18%, 8.5-16%, 9.5-18%, 9.5-16%, 10.5-18%, or 10.5-16%.
In some embodiments the solubility in water of the non-ionic surfactant, at 25° C., is at least 2%, at least 8%, at least 10%, at least 12%, at least 15%, at least 20%, at least 25%, or at least 30%, and optionally, at most 80% or at most 60%.
In some embodiments the concentration of the non-ionic surfactant within the treatment (in the liquid reservoir), by weight, is within a range of 2-18%, 1-18%, 1-15%, 1-12%, 1-10%, 1-8%, 2-18%, 2-15%, 2-12%, 2-10%, 2-8%, 3-18%, 3-15%, 3-12%, 3-10%, 3-8%, or 4-18%, 4-15%, 4-12%, 4-10%, or 4-8%.
In some embodiments the formulation (in the liquid reservoir) comprises a further non-ionic silicone-containing surfactant selected from a polysiloxane-polyoxyalkylene copolymer, and wherein optionally, a concentration of said polysiloxane-polyoxyalkylene copolymer is at least 0.3%, at least 0.5%, at least 0.75%, or at least 1.0%, by weight, and further optionally, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2%, or at most 1.75%, by weight.
In some embodiments the formulation (in the liquid reservoir) contains at least 0.3%, at least 0.5%, at least 0.75%, or at least 1.0%, by weight and optionally, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2%, or at most 1.75%, by weight, of the further, non-ionic silicone-containing surfactant.
In some embodiments, the further, non-ionic silicone-containing surfactant includes a polysiloxane-polyoxyalkylene copolymer, and wherein optionally, a concentration of said polysiloxane-polyoxyalkylene copolymer is at least 0.3%, at least 0.5%, at least 0.75%, or at least 1.0%, by weight, and further optionally, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2%, or at most 1.75%, by weight.
In some embodiments the formulation (in the liquid reservoir) contains at least 0.3%, at least 0.5%, at least 0.75%, or at least 1.0%, by weight and optionally, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2%, or at most 1.75%, by weight, of said further, non-ionic silicone-containing surfactant.
In some embodiments the formulation (in the liquid reservoir) has a total surfactant concentration of at least 2%, at least 6%, at least 7%, at least 8%, at least 10%, or at least 12%, and optionally, within a range of 6 to 40%, 6 to 30%, 6 to 20%, 7 to 30%, 7 to 20%, 7 to 15%, 8 to 25%, 8 to 20%, 8 to 15%, 8 to 13%, 9 to 25%, 9 to 20%, 9 to 15%, 9 to 13%, 10 to 25%. 10 to 20%, 10 to 15%, or 10 to 13%.
In some embodiments the formulation (in the liquid reservoir) comprises at least one wetting agent.
In some embodiments the wetting agent is PEI.
In some embodiments the PEI is one or nore of PEI detailed in Table 1 below:
In some embodiments the PEI is provided in an aqueous solution (Lupasol® PS, BASF).
Non limiting examples of applicable depletable chemical agents are N-Hance™ BF 17 cationic guar, N-Hance™ CCG 45 cationic guar, N-Hance™ HPCG 1000 cationic guar, N-Flance™ BF 13 cationic guar, N-Hance™ CG 13 cationic guar, N-Hance™ 3196 cationic guar (all from Ashland Specialty Ingredients)
In some embodiments the depletable chemical agent is guar hydroxypropyltrimonium chloride (GHPTC).
In some embodiments the depletable chemical agent is hydroxyl guar hydroxypropyltrimonium chloride (HGHPTC).
Further non limiting examples of applicable depletable chemical agents are listing in Table 2 below:
Further non limiting examples of applicable depletable chemical agents are listing in the Table 3 below:
Further details on treatment formulations suitable for the methods and systems according to the present invention are disclosed e.g., in WO2013/132418, WO 2013/132339 and WO2019/111223, the content of each is incorporated herein by reference.
Further details of non-limiting examples of ink compositions suitable for the printing processes and systems of the present invention are disclosed in WO 2013/132439, PCl/111313/51755 (WO2013/132439) or US2015/0025179, PCT/IB14/02395 (WO2015/036865) or U.S. Ser. No. 14/917,461, all of which are hereby incorporated by reference.
In some embodiments the formulations e.g., treatment formulations and ink formulations are as herein disclosed and exemplified.
It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention, which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any suitable sub-combination or as suitable in any other described embodiment of the invention.
The following examples are not in any way intended to limit the scope of the invention as claimed.
Exemplary aqueous treatment formulation used in the present study and referred to herein as V1, V2 and V3 are provided in Table 4. Table 5 and Table 6 respectively.
The treatment formulation V1 was prepared by mixing the ingredients listed herein below in Table 4:
Treatment formulation V2 was prepared by mixing the ingredients listed herein below in Table 5:
Treatment formulation V3 was prepared by mixing the ingredients listed herein below in Table 6:
It is noted that the ingredients of the treatment formulation according to the present invention can be mixed in any suitable manner to form a composition that can be applied as a coating onto an intermediate transfer member. At times the mixed ingredients may form a dispersion. To this end, the system of the invention is configured to provide mixing means to provide a homogenous dispersion of the treatment formulation.
Preparation of Pigments
Pigments used in the examples described below are generally supplied with initial particle size of a few micrometers. Such pigments were ground to submicron range in presence of the dispersing agent, the two materials being fed to the milling device (bead mill) as an aqueous mixture. The progress of milling was controlled on the basis of particle size measurements (for example, a Malvern or Nanosizer instrument). The milling was stopped when the average particle size (dv50) reached 70 to 100 nm.
Exemplary Ink Composition
In the present example, the preparation of an ink composition is described: Heliogen® Blue D7079 was milled with Disperbyk® 190, as described, and the materials were mixed in the following proportion:
The milled concentrate, having a Dv50 of less than 100 nm, typically between 70 and 100 mn, was further diluted with 50 g water and extracted from the milling device at Ca. 12 wt % pigment concentration. The millbase concentrate was further processed as below described for the preparation of an ink composition.
In a first stage, 2.4 g of sodium dodecanoate were added to 200 g of the millbase concentrate to yield a millbase. The mixture was stirred to homogeneity (5′ magnetic stirrer at 50 rpm) and incubated at 60° C. for 1 day. The mixture was then left to cool down to ambient temperature.
In a second stage, ink ingredients were added to the millbase as follows:
The mixture was stirred for 30 minutes at ambient temperature, resulting in an ink-able ink composition having a viscosity of less than 10 cP.
A stock of the treatment formulation was prepared at an amount of about 200 L.
About 0.5 gr of the treatment formulation was consumed per printed page in the printing process, for the purpose of coating the ITM.
Replenishment of the treatment formulations with additional amount of the treatment formulation (all ingredients included) was required based on the amount consumed (about weekly replenishment of 100 L, out of total ˜300 L, total replenishment usage of about 300 L per month).
The inventors of the present invention have realized the need to replenish the treatment formulation in a very frequent manner that does not reflect the need to replenish it based on a calculation of 0.5 gr of the treatment formulation per printed page.
To reduce to minimum (zero) usage of the treatment formulations beyond printing needs the effect of various factors was tested as detailed herein below:
Viscosity and Surface Tension Measurements:
The viscosity and the surface tension of the treatment formulation were tested for a period of 6 months both at room temperature and at 50° C.
The results are illustrated in
Printing Quality Measurements as a Function of the Aging and the Temperature of the Treatment Formulation:
The printing quality as a function of the age and temperature of the treatment solution was studied.
Printing Quality Measurements as a Function of the Usage of Treatment Formulation:
Problematic treatment formulations from presses, that provided low printing quality determined based on print graininess, were tested.
No difference in the physical properties thereof compared to freshly prepared treatment formulation was measured.
Printing Quality Measurements as a Function of the Usage of Treatment Formulation and as a Function of the Aging of the Blanket:
The effect of the aging of the blanket and the combination thereof with utilizing a treatment formulation from press was tested.
The Effect of the Treatment Formulations Age and Temperature on the Image Graininess:
The effect of the temperature and the aging of the treatment formulation on the image quality as reflected from the graininess of the image was tested.
Fresh treatment formulations (not used in a printing process) were used.
Three time points were determined as t=0, t=1d (one day) and t=3d (three days), and two temperatures i.e., room temperature and 50° C.
The experiment was used utilizing 2 h aged Blanket at 135° C.
Graininess—K570, 70%, QEA (K570—black ink, 70%—coating percentage of black ink in printing, QEA—digital microscope).
As reflected in
The Effect of Ink Contamination and Filtration on the Image Graininess:
The effect of ink contamination on the image graininess was tested.
Fresh treatment formulations (not used in a printing process) were used.
Three time points were determined as t=0, t=1d (one day) and t=3d (three days). Two temperatures were studied: room temperature and 50° C.
The experiment was used utilizing 2 h aged Blanket at 135° C.
Graininess—K570, 70%, QEA (K570—black ink, 70%—coating percentage of black ink in printing, QEA—digital microscope).
Ink formulations (YMCK) were introduced into the fresh treatment formulations at 4% and 8% wt.
Some formulations were filtered as detailed below.
Timewise, it is noted that low printing quality was also observed with freshly prepared treatment formulation (at time zero) into which ink formulation was introduced (
The Effect of Ink Contamination on the PEI Performance:
The above results indicated that while aging of the treatment formulation and the temperature thereof do not affect the performance thereof, ink contamination strongly affects the function ability of the treatment formulation, resulting with the need to refresh the treatment formulation (i.e., to add fresh treatment formulation to the liquid reservoir holding same in the printing process. At times, the quality of the treatment formulation is harmed to such a great extent that discard of same was required.
The negative effect of the ink contamination was not negated by filtration of the contaminated treatment formulation, implying that it is a reaction between one of the inks components and the treatment formulation that affects the quality of the treatment formulation.
The inventors have studied the possibility that reduction in the amount of the chemical agent PEI in the treatment formulation will affect the quality thereof. Specifically, the inventors investigated if reduction in the amount thereof will negatively affect the wetting of the treatment formulation which is necessary for good performance thereof.
The inventors have surprisingly found that PEI interacts with the binder of the ink formulation.
The above results indicate that PEI solely can be replenished to repair the performance of the treatment formulation and that there was no need to replenish the treatment formulation as a whole. These results further illustrate that the reduction in the printing quality resulted from reduction in the amount of the PEI. This reduction was due to a reaction of the PEI with the binder of the ink formulation.
Without wishing to be bound by theory, the inventors believe that the observed immediate phase separation and precipitation upon addition of ink binder to the PEI solution (
The above results illustrate the importance of the present of the PEI in the treatment formulation. Even slight reduction in the concentration thereof in the treatment formulation affected the performance of the treatment formulation. Even relatively small amounts of the ink contamination in the treatment formulations negatively affected the functionability thereof.
The results of the above study indicate that ink contamination of the treatment formulation have a strong negative impact on the treatment formulation performance. The performance of the treatment formulation can be repaired by addition of PEI. This addition negated the reduction in the PEI concentration in the treatment formulation which was a result of an ink contamination that caused a fast reaction between the binder of the ink formulation and the PEI. The depletion of PEI strongly affected the quality of the coating of the ITM and as such the printed image quality. The findings of the above study are of great importance and contribute to the improvement in the costs involved with the printing process inter-alia since replenishment of the whole treatment formulation is not required but rather replenishment of merely PEI. Printing quality stability can be obtained along with reduction of unnecessary waste involved with otherwise the need to discard a great amount of low quality treatment formulation.
In order to determine if addition of PEI is required to repair depletion thereof in the treatment formulation, the concentration of PEI in the treatment formulations was detected utilizing spectroscopic means known in the art, see for example the following links:
https://www.sciencedirect.com/science/article/pii/S187853213001779
https://ww.ncbi.nlm.nih.gov/pubmed/12560058
https://onlinelibrary.wiley.com/doi/abs/10.1002/pol.1967.150050816
https://www.researchgate.net/publication/299346733_Validation_of_a_New_Method_for_Spectrophotometric_Determination_of_Polyethyleneimine
In particular, PEI detection was performed using an assay involving reaction with copper. PEI can be detected using addition of copper ions, resulting in blue color emission from the solution and strong absorption at 285 nm (it is noted that absorption at 650 nm may also be utilized, but the intensity thereof relative to that observed with 285 nm is lower).
The inventors tested various samples of the treatment formulation. 1 ml sample was introduced into a 3 ml bottle and Cu solution of 0.1 M was pipetted. The solution was mixed 3 seconds using vortex.
The following embodiments are illustrative and not intended to limit the claimed subject matter.
Embodiment 1 A system for printing, comprising:
unit.
Embodiment 66 The system according to any one of Embodiments 1 to 64, wherein the depletable chemical agent is a polymeric agent that includes polyallylamine
unit.
Embodiment 67 The system according to any one of Embodiments 1 to 64, wherein the depletable chemical agent is a polymeric agent that includes poly(4-vinylpyridine)
unit.
Embodiment 68 The system according to any one of Embodiments 1 to 67, wherein the depletable chemical polymeric agent is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer (Viviprint 131), a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer (Viviprint 200), a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate (Viviprint 650), a guar hydroxypropyltrimonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride.
Embodiment 69 The system according to Embodiment 68, wherein the depletable chemical polymeric agent is polyethyleneimine (PEI).
Embodiment 70 The system according to any one of Embodiments 1 to 69, wherein the first amount of the depletable chemical polymeric agent in the formulation in the liquid reservoir is equal to or less than about 5 wt. %, 4 wt. %, 3 wt. %, 2 wt. %, 1 wt. %, 0.5 wt. %, 0.4 wt. %, 0.3 wt. %, 0.2 wt. %, 0.1 wt. %, or equals to or being at least about 0.05 wt. %, or at times at least about 0.01% wt. %.
Embodiment 71 The system according to any one of Embodiments 1 to 70, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the predetermined threshold value is at least 0.01 wt. %, at least 0.05 wt. at least 0.10 wt. %, at least 0.15 wt. % or at least 0.2 wt. %.
Embodiment 72 The system according to any one of Embodiments 1 to 71, wherein the depletable chemical agent is a polymeric agent being PEI and wherein said first amount thereof in the liquid reservoir is a concentration by weight being at most 6%, at, most 5%, at most 4%, at most 3%, at most 2.5%, at most 2.0%.
Embodiment 73 The system according to any one of Embodiments 1 to 72, wherein the depletable chemical agent is a polymeric agent being PEI and wherein said first amount thereof in the liquid reservoir is a concentration by weight is within a range of 0.01 to 1%, 0.01 to 0.8%, 0.01 to 0.7%, 0.01 to 0.6%, 0.01 to 0.5%, 0.2 to 0.7%, 0.2 to 0.6%, or 0.2 to 0.5%.
Embodiment 74 The system according to any one of Embodiments 1 to 73 wherein the at least one depletable chemical agent is PEI, wherein the first amount thereof in the formulation in liquid reservoir is 0.25 wt. % and the second amount thereof in the replenishment reservoir is 25 wt. % in water.
Embodiment 75 The system according to Embodiment 74 wherein when the first amount of the PEI in the liquid reservoir is reduced below a predetermined threshold value of 0.01 wt. % the system is configured to transfer a portion of said second amount of the PEI from the replenishment reservoir to the liquid reservoir, to thereby replenish the amount of the PEI in the liquid reservoir to a value being equal to or above said predetermined threshold value (0.01 wt. %) or to replenish the amount of the PEI in the liquid reservoir to a value being equal to the first amount (0.25 wt. %).
Embodiment 76 The system according to any one of Embodiments 1 to 75, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the average molecular weight thereof is at least 20,000, at least, 50,000, at least 100,000, at least 200,000, at least 350,000, at least 500,000, at least 700,000, at least 750,000 and optionally, at most 3,000,000, at most 2,500,000, or at most 2,000,000.
Embodiment 77 The system according to any one of Embodiments 1 to 76, wherein the depletable chemical agent is a polymeric agent being PEI, and wherein said PEI is a surface active agent, a wetting agent, an anchoring agent or any combination thereof.
Embodiment 78 The system according to any one of Embodiments 1 to 77, wherein the depletable chemical agent is a polymeric agent being PEI, wherein the charge densities of the PEI polymer is in the range of 16-20 meq/g of material.
Embodiment 79 The system according to any one of Embodiments 1 to 77, wherein the depletable chemical agent is a polymeric agent being PEI, wherein the charge densities of the PEI polymer is 8 meq/g.
Embodiment 80 The system according to any one of Embodiments 1 to 79, wherein the depletable chemical agent is silicone functionalized PEI.
Embodiment 81 The system according to any one of Embodiments 1 to 80, wherein the depletable chemical agent is a quaternary ammonium compound.
Embodiment 82 The system according to Embodiment 81, wherein the quaternary ammonium compound is Larostat264A (BASF).
Embodiment 83 The system according to Embodiment 81, wherein the quaternary ammonium compound is Foamquat SAQ (Linoleamidopropyl Ethyldimonium Ethosulfate 90).
Embodiment 84 The system according to any one of Embodiments 1 to 83, wherein the depletable chemical agent is water dispersible.
Embodiment 85 The system according to any one of Embodiments 1 to 83, wherein the depletable chemical agent is water soluble.
Embodiment 86 The system according to any one of Embodiments 1 to 85, wherein the depletable chemical agent is solid at room temperature.
Embodiment 87 The system according to any one of Embodiments 51 to 86, wherein the at least one binder in the ink is an anionic binder.
Embodiment 88 The system according to Embodiment 87, wherein said anionic binder is an acrylic binder and/or a sulfonic binder.
Embodiment 89 The system according to any one of Embodiments 51 to 88, wherein the at least one binder in the ink is a negatively charged organic polymeric resin.
Embodiment 90 The system according to Embodiment 89, wherein the average molecular weight of the negatively charged organic polymeric resin is at least 8,000.
Embodiment 91 The system according to Embodiment 89 or 90, wherein the at least one binder in the ink is an acrylic polymer and/or an acrylic-styrene co-polymer.
Embodiment 92 The system according to any one of Embodiments 51 to 91, wherein said binder is Joncryl 538 BASF.
Embodiment 93 The system according to any one of Embodiment 51 to 92, wherein the depletable chemical agent is PEI, and wherein the reduction in the first amount of PEI being due an undesired side reaction thereof with said at least one hinder.
Embodiment 94 The system according to any one of Embodiments 1 to 93, wherein said system further comprises means to detect, measure or calculate the concentration of the depletable chemical agent in the formulation which is comprised within the liquid reservoir and calculate therefrom the reduction in the first amount of said depletable chemical agent.
Embodiment 95 The system according to Embodiment 94, wherein the depletable chemical agent is PEI.
Embodiment 96 The system according to Embodiment 94, wherein said means are spectroscopic means configured to detect the PEI based on a reaction of copper with the PEI.
Embodiment 97 The system according to any one of Embodiments 1 to 96, wherein said printing system is an indirect printing system, the system further comprising:
unit.
Embodiment 149 The method according to any one of Embodiments 106 to 147, wherein the depletable chemical agent is a polymeric agent that includes polyallylamine
unit.
Embodiment 150 The method according to any one of Embodiments 106 to 147, wherein the depletable chemical agent is a polymeric agent that includes poly(4-vinylpyridine)
unit.
Embodiment 151 The method according to any one of Embodiments 106 to 147, wherein the depletable chemical polymeric agent is selected from the group consisting of linear polyethylene imine, branched polyethylene imine, modified polyethylene imine, poly(diallyldimethylammonium chloride), poly(4-vinylpyridine), polyallylamine, a vinyl pyrrolidone-dimethylaminopropyl methacrylamide co-polymer (Viviprint 131), a vinyl caprolactam-dimethylaminopropyl methacryamide hydroxyethyl methacrylate copolymer (Viviprint 200), a quaternized copolymer of vinyl pyrrolidone and dimethylaminoethyl methacrylate with diethyl sulfate (Viviprint 650), a guar hydroxypropyltritnonium chloride, and a hydroxypropyl guar hydroxypropyltrimonium chloride.
Embodiment 152 The method according to Embodiment 151, wherein the depletable chemical polymeric agent is polyethyleneimine (PEI).
Embodiment 153 The method according to any one of Embodiments 106 to 152, wherein the first amount of the depletable chemical polymeric agent in the formulation in the liquid reservoir is equal to or less than about 5 wt. %, 4 wt. %, 3 wt. %, 2 wt. %, 1 wt. %, 0.5 wt. %, 0.4 wt. % 0.3 wt %, 0.2 wt. %, 0.1 wt. %, or equals to or being at least about 0.05 wt. % or at times at least about 0.01% wt. %.
Embodiment 154 The method according to any one of Embodiments 106 to 153, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the predetermined threshold value is at least 0.01 wt. %, at least 0.05 wt. %, at least 0.10 wt. %, at least 0.15 wt. % or at least 0.20 wt. %.
Embodiment 155 The method according to any one of Embodiments 106 to 154, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the first amount thereof by weight, in the liquid formulation is at most 6%, at most 5%, at most 4%, at most 3%, at most 2.5%, at most 2.0%.
Embodiment 156 The method according to any one of Embodiments 106 to 155, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the first amount thereof, by weight, in the liquid formulation, is within a range of 0.01 to 1%, 0.01 to 0.8%, 0.01 to 0.7%, 0.01 to 0.6%, 0.01 to 0.5%, 0.2 to 0.7%, 0.2 to 0.6%, or 0.2 to 0.5%.
Embodiment 157 The method according to any one of Embodiments 106 to 156 wherein the at least one depletable chemical agent is PEI, wherein the first amount thereof in the formulation in liquid reservoir is 0.25 wt. % and the second amount thereof in the replenishment reservoir is 25 wt. % in water.
Embodiment 158 The method according to Embodiment 157 wherein when the first amount of the PEI in the liquid formulation is reduced below a predetermined threshold value of 0.01 wt. % a portion of said second amount of the PEI is added to said liquid formulation, to thereby replenish the amount of the PEI in the liquid formulation to a value being equal to or above said predetermined threshold value (0.01 wt.) or to replenish the amount of the PEI the liquid formulation to a value being equal to the first amount (0.25 wt. %).
Embodiment 159 The method according to any one of Embodiments 106 to 158, wherein the depletable chemical agent is a polymeric agent being PEI and wherein the average molecular weight thereof is at least 20,000, at least, 50,000, at least 100,000, at least 200,000, at least 350,000, at least 500,000, at least 700,000, at least 750,000 and optionally, at most 3,000,000, at most 2,500,000, or at most 2,000,000.
Embodiment 160 The method according to any one of Embodiments 106 to 159, wherein the depletable chemical agent is a polymeric agent being PEI, and wherein said PEI is a surface active agent, a wetting agent, an anchoring agent or any combination thereof.
Embodiment 161 The method according to any one of Embodiments 106 to 160, wherein the depletable chemical agent is a polymeric agent being PEI, wherein the charge densities of the PEI polymer is in the range of 16-20 meq/g of material.
Embodiment 162 The method according to any one of Embodiments 106 to 160, wherein the depletable chemical agent is a polymeric agent being PEI, wherein the charge densities of the PEI polymer is of 8 meq/g.
Embodiment 163 The method according to any one of Embodiments 106 to 162, wherein the depletable chemical agent is silicone functionalized PEI.
Embodiment 164 The method according to any one of Embodiments 106 to 163, wherein the depletable chemical agent is a quaternary ammonium compound.
Embodiment 165 The method according to Embodiment 164, wherein the quaternary ammonium compound is Larostat264A (BASF).
Embodiment 166 The method according to Embodiment 164, wherein the quaternary ammonium compound is Foamquat SAQ (Linoleamidopropyl Ethyldimonium Ethosulfate 90).
Embodiment 167 The method according to any one of Embodiments 106 to 166, wherein the depletable chemical agent is water dispersible.
Embodiment 168 The method according to any one of Embodiments 106 to 166, wherein the depletable chemical agent is water soluble.
Embodiment 169 The method according to any one of Embodiments 106 to 168, wherein the depletable chemical agent is solid at room temperature.
Embodiment 170 The method according to any one of Embodiments to 134 to 169, wherein the least one binder in the ink formulation is a negatively charged organic polymeric resin.
Embodiment 171 The method according to Embodiment 170, wherein the average molecular weight of the a negatively charged organic polymeric resin is at least 8,000.
Embodiment 172 The method according to Embodiment 170 or 171, wherein the at least one binder in the ink formulation is an acrylic polymer and/or an acrylic-styrene co-polymer.
Embodiment 173 The method according to Embodiment 170, wherein the binder is to Joncryl 538 BASF.
Embodiment 174 The method according to any one of Embodiments 106 to 173, wherein the depletable chemical agent is PEI, and wherein the reduction in the first amount of PEI being due an undesired side reaction thereof with said at least one binder.
Embodiment 175 The method according to any one of Embodiments 106 to 174, wherein said method further comprises detecting and/or measuring and/or calculating the concentration of the depletable chemical agent in the liquid formulation and calculate therefrom the reduction in the first amount of said depletable chemical agent.
Embodiment 176 The method according to Embodiment 175, wherein the depletable chemical agent is PEI and wherein said detecting and/or measuring and/or or calculating is performed by spectroscopic means utilizing a reaction of copper with said PEI.
Embodiment 177 The method according to any one of Embodiments 106 to 176 wherein said treatment formulation comprises:
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/IL2020/050384 | 3/30/2020 | WO |
| Publishing Document | Publishing Date | Country | Kind |
|---|---|---|---|
| WO2020/202145 | 10/8/2020 | WO | A |
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| Number | Date | Country | |
|---|---|---|---|
| 20220274411 A1 | Sep 2022 | US |
| Number | Date | Country | |
|---|---|---|---|
| 62827083 | Mar 2019 | US |
