Patent Application
20110057068
Winders are machines that roll lengths of paper, commonly known as paper webs, into rolls. These machines are capable of rolling lengths of web into rolls at high speeds through an automated process. Turret winders are well known in the art. Conventional turret winders comprise a rotating turret assembly which support a plurality of mandrels for rotation about a turret axis. The mandrels travel in a circular path at a fixed distance from the turret axis. The mandrels engage hollow cores upon which a paper web can be wound. Typically, the paper web is unwound from a parent roll in a continuous fashion, and the turret winder rewinds the paper web onto the cores supported on the mandrels to provide individual, relatively small diameter logs. The rolled product log is then cut to designated lengths into the final product. Final products typically created by these machines and processes are toilet tissue rolls, paper toweling rolls, paper rolls, and the like.
The winding technique used in turret winders is known as center winding. A center winding apparatus, for instance, is disclosed in U.S. Pat. Reissue No. 28,353 to Nystrand, which is incorporated herein by reference. In center winding, a mandrel is rotated in order to wind a web into a roll/log, either with or without a core. Typically, the core is mounted on a mandrel that rotates at high speeds at the beginning of a winding cycle and then slows down as the size of the rolled product being wound increases, in order to maintain a constant surface speed, approximately matching web speed. Center winders work well when the web that is being wound has a printed, textured, or slippery surface. Also, typically, center winders are preferable for efficiently producing soft-wound, higher bulk rolled products.
A second type of winding is known in the art as surface winding. A machine that uses the technique of surface winding is disclosed in U.S. Pat. No. 4,583,698. Typically, in surface winding, the web is wound onto the core via contact and friction developed with rotating rollers. A nip is typically formed between two or more co-acting roller systems. In surface winding, the core and the web that is wound around the core are usually driven by rotating rollers that operate at approximately the same speed as the web speed. Surface winding is preferable for efficiently producing hard-wound, lower bulk rolled products.
A problem found in both center and surface winders involves the winder shutting down when a condition such as a core load fault or a web break fault occurs. If a core on a turret winder, for instance, is not properly loaded onto the mandrel, the machine must shut down for the fault to be corrected. Similarly, a web break fault in a surface winder will also result in shutting the machine down. This results in a production loss and the immediate requirement to obtain repair services. The present invention provides a way of eliminating such problems by allowing the machine to continue to produce rolled product even though a fault condition has occurred. Additionally, the invention incorporates the advantages of both center and surface winding to produce rolled products having various characteristics by using either center winding, surface winding, or a combination of center and surface winding.
Another problem with both conventional center and surface winders is that the winders provide limited control over the properties of the resulting rolled product. For instance, with respect to center winders, the only control mechanism for controlling the roll bulk of the finished product is web tension. Thus, center winders can only produce products having a limited range of roll bulk without causing excessive delay or increasing product strength to undesirable levels.
Surface winders are also similarly limited in the ability to control the roll bulk of resulting products. Surface winders, for instance, depend on surface friction to drive the winding roll. Attempts to produce products with a relatively high roll bulk require that the contact pressure between the material being wound and the surface winding device be decreased. Decreasing contact pressure, however, also decreases friction and results in loss of control over the product being formed leading to quality issues and productivity issues associated with log instability in the winding pocket. Surface winders also have problems running at relatively higher speeds when producing products with higher roll bulks.
In view of the above, a need currently exists for a system and process that is capable of producing rolled products having a greater range of roll bulk characteristics. In addition, a need exists for a system and process capable of producing products either having a low roll bulk or a high roll bulk while also producing the products at relatively high speeds and without interruption.
In the prior art, a winder is typically known as an apparatus that performs the very first wind of that web, generally forming what is known as a parent roll. A rewinder, on the other hand, is an apparatus that winds the web from the parent roll onto a roll that is essentially the finished product. It is to be noted, the prior art is not consistent in designating what is and is not a winder or rewinder. For instance, rewinders are sometimes called winders, and winders are sometimes referred to as rewinders.
Objects and advantages of the invention will be set forth in part in the following description, or may be obvious from the description, or may be learned from practice of the present invention.
As used herein, “winder” is generic to a machine for forming a parent roll, and a machine (rewinder) for forming a roll/log from a parent roll. In other words, the word “winder” is broad enough to cover both a “winder” and “rewinder”.
The present invention may include a web transport apparatus for conveying a web to a winder for winding the web to produce a rolled product. Also, a plurality of independent winding modules may be present. The winding modules are independently positioned to independently engage the web as it is conveyed by the web transport apparatus. The winding modules engage the web and wind the web to form a rolled product. The winding modules are configured to wind using center winding, surface winding, or a combination of center and surface winding. The winding modules are controlled and positioned independent of one another. Therefore, if one winding module is disabled another winding module may still operate to produce the rolled product without having to shut down the winder.
Also according to the present invention, a winder is disclosed as above where the plurality of independent winding modules may each have a core loading apparatus and a product stripping apparatus.
Also disclosed according to the present invention is a winder as set forth above where the plurality of independent winding modules each have a center driven mandrel onto which the web is wound to form the rolled product.
Also disclosed according to the present invention, is a method of producing a rolled product from a web. This method includes the step of conveying the web by a web transport apparatus. Another step in the method of the present invention may involve winding the web into the rolled product by using one or more winding modules. This may involve winding the web by one or more winding modules of the plurality of winding modules at any given time. The process that is used to wind the web may be center winding, surface winding, or a combination of both center and surface winding. The winding modules may act independently of one another to allow one or more winding modules to still wind the web to produce a rolled product without having to shut down the plurality of winding modules if any of the remaining winding modules fault or are disabled. The method according to the present invention also includes the step of transporting the rolled product from the winding module.
Another exemplary embodiment of the present invention may include a winder that is used for winding a web to produce a rolled product that has a web transport apparatus for conveying a web. This exemplary embodiment also has a plurality of independent winding modules mounted within a frame where each winding module has a positioning apparatus for moving the winding module into engagement with the web. Each winding module also has a mandrel that is rotated onto which the web is wound to form the rolled product. The winding modules are operationally independent of one another where if any of the winding modules are disabled, the remaining winding modules could continue to operate to produce the rolled product without having to shut down the winder. The rotational speed of the mandrel and the distance between the mandrel and the web transport apparatus may be controlled so as to produce a rolled product with desired characteristics. The winding modules are configured to wind the web by center winding, surface winding, and combinations of center and surface winding.
Another aspect of the present invention includes an exemplary embodiment of the winder as immediately discussed where each winding module may have a core loading apparatus for loading a core onto the mandrel. This exemplary embodiment also has a rolled product stripping apparatus for removing the rolled product from the winding module.
For example, in one embodiment, the core loading apparatus may comprise a core loading assembly slidably mounted on a mandrel. The core loading assembly may include a gripping device and a stabilizer. The gripping device can include at least two gripping members that are movable towards and away from each other. For instance, the gripping members may be pneumatically or hydraulically actuated. The stabilizer, on the other hand, can be slidably engaged on the mandrel for stabilizing the mandrel as the gripping device pulls a core onto the mandrel. The stabilizer, for instance, may have a configuration similar to the gripping device. The stabilizer may include at least two stabilizing members that are movable towards and away from each other and that surround the mandrel. Similar to the gripping device, the stabilizing members can be pneumatically or hydraulically actuated.
The core loading assembly can be attached to an actuator that is configured to move the core loading assembly back and forth across the mandrel. In this embodiment, in order to load a core onto the mandrel, the gripping members of the gripping device engage a core at the first end of the mandrel while the actuator moves the core loading assembly towards the second end of the mandrel thereby pulling a core onto the mandrel. The actuator, for instance, may comprise a linear track that is powered by a servo motor.
In one embodiment, the gripping members have a shape that surrounds a substantial portion of the core as it is pulled across the mandrel. For instance, the gripping members may define a rectangular-like cross-sectional shape that is configured to engage a core without harming the core.
In one embodiment, a controller, such as a microprocessor, may be placed in communication with the actuator and the core loading assembly. The controller can be configured to load a core onto the mandrel according to a predetermined sequence for positioning the core at a particular location.
Once the core is loaded on the mandrel, a web of material is wound onto the core to form a roll. In one embodiment, the core loading assembly can be used also to push a formed roll off the mandrel.
Another aspect of the present disclosure is directed to an apparatus for breaking a moving web while the web is being wound onto the mandrels. In particular, the apparatus for breaking the web is particularly well suited to breaking the web in order to form a new leading edge without having to stop or slow down the web.
In one embodiment, for instance, the apparatus can include a first rotating arm and a second rotating arm that are positioned adjacent to a conveying surface. The first rotating arm can be spaced upstream from the second rotating arm. The first rotating arm defines a first contact surface that contacts the conveying surface when the arm is rotated and the second rotating arm defines a second contact surface that also contacts the conveying surface when the arm is rotated.
In order to break a moving web on the conveying surface, both arms are rotated causing each of the contact surfaces to contact the moving web on the conveying surface simultaneously. The second rotating arm, however, is rotated at a faster speed than the first rotating arm during contact with the moving web causing the moving web to break in between the first and second contact surfaces.
In one embodiment, for instance, a perforation line can be formed into the moving web that is generally perpendicular to the direction of movement. The perforation line can be positioned in between the first and second contact surfaces of the rotating arms during the breaking process causing the web to break along the perforation line.
The conveying surface in one embodiment can comprise a rotating roll that rotates at generally the same speed as the web is moving. For instance, in one particular embodiment, the conveying surface may comprise a vacuum roll that not only rotates but holds the web onto the conveying surface.
During the breaking process, the first contact surface can be moving at generally about the same speed as the moving web during contact. The second contact surface, on the other hand, can be moving from about 2% to about 200% faster than the first contact surface. When the contacting surfaces are simultaneously contacting the moving web, the contacting surfaces can be spaced any suitable distance apart. For instance, in one embodiment, the contact surfaces may be from about 2 inches to about 12 inches apart, such as from about 4 inches to about 8 inches apart.
Yet another exemplary embodiment of the present invention includes a winder as substantially discussed above where each of the winding modules has a center winding means, a surface winding means, and a combination center and surface winding means.
In one embodiment of a process and system made in accordance with the present disclosure, center and surface winding are used in combination to control at least one property of the rolled product being formed. In one embodiment, for instance, the process includes the steps of unwinding a tissue web from a parent roll and conveying the tissue web downstream on a web transport apparatus at a tension. A plurality of winding modules can be positioned adjacent to the web transport apparatus. Each winding module can include a mandrel that is in operative association with a driving device. A rotating mandrel can be positioned adjacent to the transport apparatus for forming a nip between the web transport apparatus and the mandrel.
A tissue web can be conveyed into the nip formed between the mandrel and the web transport apparatus so as to initiate winding of the web onto the mandrel. In accordance with the present disclosure, the nip pressure, the incoming tension, and/or the torque of the mandrel can be controlled in order to control the roll bulk of a roll being wound. In particular, the above process is capable of producing rolled products having a wide range of roll bulk characteristics. For instance, nip pressure, incoming tension and mandrel torque can all be controlled in combination to produce rolled products having a desired roll bulk of anywhere between from about 2 cc/g to about 14 cc/g, such as from about 3 cc/g to about 13 cc/g.
As described above, each winding module is capable of operating independently from another winding module in the system. In this manner, different winding modules can be configured to produce products having the same or different characteristics. For instance, in one embodiment, one winding module may be configured to produce products having a certain roll bulk while another winding module in the system may be configured to simultaneously produce products having a different roll bulk. In addition to different roll bulks, the different modules can also produce products having different roll diameters.
Reference will now be made in detail to exemplary embodiments of the invention, one or more examples of which are illustrated in the drawings. Each example is provided by way of explanation of the invention, and not meant as a limitation of the invention. For example, features illustrated or described as part of one exemplary embodiment can be used with another exemplary embodiment to yield still a third exemplary embodiment. It is intended that the present invention include these and other modifications and variations.
A winder is provided in the present invention that is capable of winding web directly from a parent roll to form a rolled product. The winder may comprise a winding module that has a rotating mandrel that engages the leading edge of a moving web. Upon transfer of the leading edge of the web to the core, the winding mandrel is disengaged from the transport apparatus removing any nip pressure for the remainder of the wind. The web may be wound about the core through the rotation of the center driven mandrel. This type of winding is known as center winding. Additionally, the mandrel may be placed onto the web to form and maintain nip pressure between the winding mandrel and the web. The web may be wound about the core through the rotation of the surface driven mandrel. This type of winding is a form of surface winding. As such, the winding module of the present invention may wind web into a rolled product by center winding, surface winding, and combinations of center and surface winding. This allows for the production of rolled products with varying degrees of softness and firmness.
For example, in one embodiment, the winding apparatus may include a driven mandrel and a driven transport belt and the apparatus may include control over the position of the mandrel, the drive control of the mandrel, and the drive control of the transport belt in a manner that controls web tension, nip forces and torque generation between the center drive and the surface drive to increase the product winding capability. In this manner, for instance, the apparatus may be used to produce products having relatively low roll bulks, products having relatively high roll bulks, and products having roll bulks anywhere in between. In addition, the improved control over winding conditions also allows for reduced perforation strengths when producing perforated products. Of particular advantage, all of the above products can be produced at relatively fast speeds, such as at speeds greater than 1500 feet per minute, such as at speeds greater than 1800 feet per minute, such as even at speeds greater than 2000 feet per minute.
Also, the present invention provides for a winder that has a plurality of independent winding modules. Each individual winding module may wind the web such that if one or more modules are disabled, the remaining modules may continue to wind without interruption. This allows for operator servicing and routine maintenance or repairs of a module to be made without shutting down the winder. This configuration has particular advantages in that waste is eliminated and efficiency and speed of the production of the rolled product is improved.
The present invention makes use of a winding module 12 as shown in
Referring to
If not done before, the web 36 may be cut once the desired length of web 36 has been rolled onto the core 24. At this point, the leading edge of the next web 36 will be moved by the web transport apparatus 34 into contact with another winding module 12.
Once the rolled product 38 with a core 24 is stripped from the mandrel 26, the mandrel 26 is moved into a core loading position as shown in
Situated adjacent to the frame 14 are a series of core supplying apparatuses 18. A plurality of cores 24 may be included within each core supplying apparatus 18. These cores 24 may be used by the plurality of independent winding modules 12 to form rolled products 22. Once formed, the rolled products 22 may be removed from the plurality of independent winding modules 12 and placed onto a rolled product transport apparatus 20. The rolled product transport apparatus 20 is located proximate to the frame 14 and web transport apparatus 34.
Each winding module 1-6 is shown performing a different function. Winding module 1 is shown in the process of loading a core 24 thereon. The plurality of independent winding modules 12 are provided with a core loading apparatus for placing a core 24 onto a mandrel 26 of the plurality of independent winding modules 12. Any number of variations of a core loading apparatus may be utilized in other exemplary embodiments of the present invention. For instance, the core loading apparatus may be a combination of a rod that extends into the core supplying apparatus 18 and pushes a core 24 partially onto the mandrel 26 and a mechanism attached to the linear actuator of the product stripping apparatus 28 that frictionally engages and pulls the core 24 the remaining distance onto the mandrel 26. As shown in
Referring to
As shown in
In addition to the linear actuator 208 as shown in
The mandrel 26 as shown is supported on one end by a bearing 214. On the opposite end, the mandrel 26 is engagable with a cupping arm 70. The cupping arm 70 is in communication with a motor 206. The motor 206 causes the cupping arm to rotate thereby engaging and disengaging the end of the mandrel 26. For example, in
As illustrated in
For example, in one embodiment, the gripping members 218 can be pneumatically or hydraulically actuated. In this regard, as shown in
In the embodiment illustrated in
The gripping members 218 of the gripping device 202 are intended to engage and hold the core 24 for pulling the core onto the mandrel 26 without damaging the core. For example, having the gripping members 218 be fluid controlled allows for fine adjustments in the amount of pressure being placed on the core 24. In addition, the gripping members 218 can pivot which allows for the gripping members to accommodate for some misalignment.
For instance, as shown in
The gripping members 218 can be made from any suitable material capable of engaging the core 24 without damaging the core. The gripping members 218, for instance, can be made for any suitable hard or soft material. In one particular embodiment, for instance, the gripping members 218 can be made from a metal.
As shown in
The core loading assembly 200 and the actuator 208 can be placed in communication with a controller, such as a microprocessor that is capable of actuating a sequence for loading a core onto the mandrel at a desired position and then stripping a rolled product from the mandrel. One sequence for loading a core onto the mandrel is illustrated in
For instance, as shown in
As shown in
Once the core is engaged, the core 24 is pulled onto the mandrel 26 as shown in
Once the core 24 is loaded onto the mandrel 26 as shown in
The core loading apparatus described above can provide various benefits and advantages when forming the rolled products. For example, the core loading apparatus as described above is capable of pulling the cores onto the mandrel into a fixed position. In addition, the mandrel is stabilized and held in position during the loading process. By minimizing positional changes of the core and of the mandrel, the likelihood of successful core loading is vastly improved, which maximizes productivity and minimizes waste with respect to core loading operations. Furthermore, the core loading apparatus as described above is conducive to various conditions of core material and rigidity. For example, limp or flaccid cores can be pulled onto mandrels instead of rigid paper material if desired. In addition, the core loading apparatus also serves as a log strip device after the rolled product is formed. This dual function is advantageous because it simplifies design and minimizes hardware.
Referring back to
Each of the plurality of independent winding modules 12 is provided with a product stripping apparatus 28 that is used to remove the rolled product 22 from the winding modules 1-6. Winding module 3 is shown as being in the process of stripping a rolled product 22 from the winding module 3. The product stripping apparatus 28 is shown as being a flange which stabilizes the mandrel 26 and contacts an end of the rolled product 22 and pushes the rolled product 22 off of the mandrel 26. Also, the product stripping apparatus 28 helps locate the end of the mandrel 26 in the proper position for the loading of a core 24. The rolled product stripping apparatus 28 therefore is a mechanical apparatus that moves in the direction of the rolled product transport apparatus 20. The product stripping apparatus 28 may be configured differently in other exemplary embodiments of the invention.
The winding module 4 is shown as being in the process of winding the web 36 in order to form the rolled product 22. This winding process may be center winding, surface winding, or a combination of center and surface winding. These processes will be explained in greater detail below.
Winding module 5 is shown in a position where it is ready to wind the web 36 once the winding module 4 finishes winding the web 36 to produce a rolled product 22. In other words, winding module 5 is in a “ready to wind” position.
Winding module 6 is shown in
Each winding module 12 may have a positioning apparatus 56 (
Therefore, each of the plurality of independent winding modules 12 may be a self-contained unit and may perform the functions as described with respect to the winding modules 1-6. Winding module 1 may load a core 24 onto the mandrel 26 if a core 24 is desired for the particular rolled product 22 being produced. Next, the winding module 1 may be linearly positioned so as to be in a “ready to wind” position. Further, the mandrel 26 may be rotated to a desired rotational speed and then positioned by the positioning apparatus 56 in order to initiate contact with the web 36. The rotational speed of the mandrel 26 and the position of the winding module 1 with respect to the web 36 may be controlled during the building of the rolled product 22. After completion of the wind, the position of the module 1 with respect to the web 36 will be varied so that the winding module 1 is in a position to effect removal of the rolled product 22. The rolled product 22 may be removed by the product stripping apparatus 28 such that the rolled product 22 is placed on the rolled product transport apparatus 20. Finally, the winding module 1 may be positioned such that it is capable of loading a core 24 onto the mandrel 26 if so desired. Again, if a coreless rolled product were to be produced as the rolled product 22, the step of loading a core 24 would be skipped. It is to be understood that other exemplary embodiments of the present invention may have the core 24 loading operation and the core 24 stripping operation occur in the same or different positions with regard to the mandrel 26.
The rewinder 10 of the present invention may form rolled products 22 that have varying characteristics by changing the type of winding process being utilized. The driven mandrel 26 allows for center winding of the web 36 in order to produce a low density, softer rolled product 22. The positioning apparatus 56 in combination with the web transport apparatus 34 allow for surface winding of the web 36 and the production of a high density, harder wound rolled product 22. Surface winding is induced by the contact between the core 24 and the web 36 to form a nip 68 (shown in
The plurality of independent winding modules 12 may be adjusted in order to accommodate for the building of the rolled product 22. For instance, if surface winding were desired, the pressure between the rolled product 22 as it is being built and the web transport apparatus 34 may be adjusted by the use of the positioning apparatus 56 during the building of the rolled product 22.
In addition to controlling the torque of the mandrel and the nip pressure as described above, web tension can also be controlled during the process. Web tension can be controlled in various ways. Web tension can be controlled, for instance, by varying a draw of the tissue web between the mandrel and a tension device upstream. The tension device upstream, for instance, may comprise the device that unwinds the parent roll or may comprise another web tension device positioned prior to the web transport apparatus. In one embodiment, for instance, a suction device, such as a vacuum roll, may be positioned in the system prior to the web transport apparatus 34. Web tension can then be controlled by varying the draw between the mandrel and the vacuum roll or by varying the draw between the mandrel and the web transport apparatus combined and the vacuum roll.
Instead of or in addition to the above, web tension can also be controlled in various other ways. For instance, web tension can also be controlled by controlling the mandrel speed in relation to the amount of force being exerted on the tissue web by the web transport apparatus.
Utilizing a plurality of independent winding modules 12 allows for a rewinder 10 that is capable of simultaneously producing rolled product 22 having varying attributes. For instance, the rolled products 22 that are produced may be made such that they have different sheet counts. Also, the rewinder 10 can be run at both high and low cycle rates with the modules 12 being set up in the most efficient manner for the rolled product 22 being built. The winding modules 12 of the present invention may have winding controls specific to each module 12, with a common machine control. Real time changes may be made where different types of rolled products 22 are produced without having to significantly modify or stop the rewinder 10. Real time roll attributes can be measured and controlled. The present invention includes exemplary embodiments that are not limited to the cycle rate.
The present invention is also capable of producing a wide spectrum of rolled products 22, and is not limited towards a specific width of the web 36.
In one particular embodiment, the present disclosure is particularly directed to a system that is capable of producing products having any desired roll bulk within a relatively large roll bulk range. The roll bulk of the resulting product, for instance, can be controlled by controlling at least one of the nip pressure, the incoming tension of the tissue web and/or the torque of the mandrel as described above. In one embodiment, for instance, only a single one of the above process conditions can be controlled to vary roll bulk, such as the nip pressure. In another embodiment, at least two of the above process conditions can be controlled to produce products. In still another embodiment, all three of the above process conditions can be controlled together to produce a product having a desired roll bulk. For example, softer rolls having relatively high roll bulk levels can be created by decreasing the torque of the mandrel, decreasing the nip pressure between the mandrel and the transport conveyor and/or decreasing incoming tension, which may be the tension between the mandrel and a tension device upstream, such as a vacuum roll. Conversely, more firm rolls having less roll bulk can be made by increasing the torque of the mandrel, increasing nip pressure, and/or increasing incoming tension.
The system of the present disclosure, for instance, is capable of producing rolled products having a roll bulk anywhere between from about 2 cc/g to about 14 cc/g, such as from about 3 cc/g to about 13 cc/g. Conventional rewinders, such as surface driven winders or center driven winders, on the other hand, simply are not capable of producing products within such a broad range of roll bulks efficiently or at consistently high production speeds.
Of particular advantage, products can be made within the entire roll bulk range described above without having to substantially reduce the speed of the system. In particular, products having any desired roll bulk can be produced while the tissue web is traveling at a speed of greater than about 1500 feet/minute, such as greater than about 1800 feet/minute, such as greater than 2000 feet/minute. In one embodiment, for instance, the products can be produced while the tissue web is moving at a speed of from about 2000 feet/minute to about 3000 feet/minute, such as even greater than 2500 feet/minute.
In one particular embodiment, the system of the present invention is used to produce products having a relatively high roll bulk, such as products having a roll bulk of greater than about 8 cc/g, such as even greater than 10 cc/g. In producing products having a relatively high roll bulk, one of the advantages of the system of the present disclosure is that the tissue web can be fed to the mandrel at a web tension of substantially zero. In addition, once the product is produced on the mandrel, the tissue sheet can be cut at very low web tension, especially when using the cut-off module 60 as shown in
The plurality of independent winding modules 12 can be designed in such a way that maintenance may be performed on any one or more of the winding modules 1-6 without having to interrupt operation, as previously discussed with winding module 6. A winding module 12 may be removed and worked on while the rest keep running. Further, having a plurality of independent winding modules 12 allows for an increase in the time intervals available for the core 24 loading functions and the rolled product 22 stripping functions. Allowing for an increase in these time intervals greatly reduces the occurrence of loading and stripping errors. Also, prior art apparatuses experiencing interruption of the winding operation will produce a rolled product 22 that is not complete. This waste along with the waste created by the changing of a parent roll or product format change will be reduced as a result of the rewinder 10 in accordance with the present invention. Waste may be removed from the rewinder 10 by use of a waste removal apparatus 200 (
A horizontal linear support member 46 is also present in the plurality of independent winding modules 12. The horizontal linear support member 46 may communicate with a horizontal linear slide 54 (as shown in
The plurality of winding modules 12 may also be modified such that additional improvements are realized. For instance, a tail sealing apparatus 30 may be included on the plurality of independent winding modules 12. As shown in
In order to get the web 36 onto the mandrel 26, the mandrel 26 as shown in
One particular embodiment of a cut-off module 60 that is particularly well suited to breaking the web 36 while moving is shown in
As shown, the cut-off module 60 includes a rotating roll 300, such as a vacuum roll that rotates with the web 36 and defines a conveying surface 302. In this embodiment, the vacuum roll 300 is placed adjacent to a guide roll 304 which can receive the web 36 from a parent roll or directly from a papermaking process. Not shown is a perforation module 64. The web 36, however, can be perforated as it is unwound or can be pre-perforated.
As shown in
In the embodiment illustrated in
When it is desirable to form a break in the web, however, each of the arms 306 and 308 can be rotationally accelerated so that both contact surfaces 310 and 312 contact the moving web on the conveying surface 302 simultaneously. In order for the web to break, however, the second rotating arm 308 is rotated slightly faster than the first rotating arm 306. In this manner, the first rotating arm 306 serves to hold the web against the conveying surface while the second arm 308 pulls and breaks the web. In one embodiment, the arms are spaced a distance and the process is timed so that both contact surfaces 310 and 312 contact the web 36 when there is a perforation line located in between the two contact surfaces. In this manner, the break occurs along the perforation line.
More particularly, in order to form a break in the web, the first arm 306 is accelerated to a speed such that the contact surface 310 contacts the web 36 at a speed that is either slower or at substantially the same speed at which the web is moving.
As described above, the second arm 308 is rotated at a speed such that the contact surface 312 contacts the moving web at a speed greater than at which the first contact surface 310 is moving. For instance, in one embodiment, the second contact surface 312 can be moving at a speed that is from about 2% to about 200% faster than the speed at which the first contact surface 310 is moving. For example, in one particular embodiment, the second contact surface 312 can be moving at a speed that is from about 5% to about 30% faster than the speed at which the first contact surface 310 is moving when contact with the web occurs.
The contact surface 312 of the second arm 308, for instance, can be traveling at a speed that is substantially the same speed at which the web is moving when the speed of the first contact surface 310 is slower than the speed of the web. Alternatively, the second contact surface 312 may be moving at a speed faster than that at which the web is moving.
When the contact surfaces 310 and 312 contact the moving web, in one embodiment, the first contact surface 310 contacts the web prior to the second contact surface 312. Both contact surfaces 310 and 312, however, are generally both in contact with the web as the web is being broken. During the breaking process, the first contact surface 310 holds the web for a brief moment of time while the second contact surface 312 pulls on the web with sufficient force for the break to occur.
The spacing between the first arm 306 and the second arm 308 during contact with the web can vary greatly depending upon the particular type of web material being conveyed and various other factors. For instance, in one embodiment, the contact surfaces 310 and 312 can be spaced from about 1 inch to about 20 inches apart. When processing bath tissue, the contact surfaces, for instance, can be spaced from about 2 inches to about 12 inches apart, such as from about 4 inches to about 8 inches apart, during contact with the web. The spacing, for instance, can be set so that the arms do not interfere with each other and allows for accuracy in placing a perforation line in between the two contact surfaces.
The contact surfaces 310 and 312 can be made from the same material or from different materials. In one embodiment, for instance, the second contact surface 312 can have a higher coefficient of friction than the first contact surface 310. For instance, the second contact surface 312 can be made from a rubber-like material that better grips the web during the breaking process. The first contact surface 310, on the other hand, can be a low friction material that prevents interference with the moving web. For instance, in one embodiment, the first contact material 310 can be made from a textile material, such as a loop material.
The cut-off module 60 as shown in
Also shown in
It is believed that using a web transport apparatus 34 that has a vacuum conveyor or a vacuum roll will aid in damping the mandrel 26 vibrations that occur during transfer of the web 36 onto the mandrel and also during the winding of the mandrel 26 to form a rolled product 22. Doing so will allow for higher machine speeds and hence improve the output of the rewinder 10.
Each of the winder modules 1-6 of the plurality of independent winding modules 12 do not rely on the successful operation of any of the other modules 1-6. This allows the rewinder 10 to operate whenever commonly occurring problems during the winding process arise. Such problems could include for instance web breaks, ballooned rolls, missed transfers, and core loading errors. The rewinder 10 therefore will not have to shut down whenever one or more of these problems occurs because the winding modules 1-6 can be programmed to sense a problem and work around the particular problem without shutting down. For instance, if a web break problem occurred, the rewinder 10 may perform a web cut by a cut-off module 60 and then initiate a new transfer sequence in order to start a new winding about the next available winding module 1-6. Any portion of the web 36 that was not wound would travel to the end of the web transport apparatus 34 where a waste removal apparatus 200 could be used to remove and transport the waste to a location remote from the rewinder 10. The waste removal apparatus 200 could be for instance an air conveying system. The winding module 1-6 whose winding cycle was interrupted due to the web break could then be positioned accordingly and initiate removal of the improperly formed rolled product 22. Subsequently, the winding module 1-6 could resume normal operation. During this entire time, the rewinder 10 would not have to shut down.
Another exemplary embodiment of the present invention involves the use of a slit web. Here, the web 36 is cut one or more times in the machine direction and each slit section is routed to a plurality of winding modules 12. It is therefore possible to wind the web 36 by two or more modules 12 at the same time.
Exemplary embodiments of the present invention can allow for the winding process to be performed at the back end of a tissue machine. In this way, the tissue web 36 could be directly converted to product sized rolls 22 which in turn would bypass the need to first wind a parent roll during the manufacturing and subsequent rewinding process. Still another exemplary embodiment of the present invention makes use of only a single winding module 12, instead of a plurality of winding modules 12.
The exemplary embodiment of the rewinder shown in
The operation of the exemplary embodiment shown in
Winding modules 2 and 6 are located at the core loading position 100. However, these modules may be positioned such that maintenance can be performed on them, or be in the “ready to wind” position. Module 5 is at the stripping position 102. However, module 5 may also be in the process of just completing the stripping of a rolled product 22.
The present disclosure may be better understood with reference to the following example.
A winding system as shown in
During the winding process, the torque of the mandrel, the nip pressure, and the web tension were controlled in order to vary the roll firmness and the roll bulk. The following tests were conducted on the products:
Roll Bulk is the volume of paper divided by its mass on the wound roll. Roll Bulk is calculated by multiplying pi (3.142) by the quantity obtained by calculating the difference of the roll diameter squared in cm squared (cm2) and the outer core diameter squared in cm squared (cm2) divided by 4 divided by the quantity sheet length in cm multiplied by the sheet count multiplied by the bone dry Basis Weight of the sheet in grams (g) per cm squared (cm2).
Roll Bulk in cc/g=3.142.times.(Roll Diameter squared in cm2-outer Core Diameter squared in cm2)/(4.times.Sheet length in cm.times.sheet count.times.Basis Weight in g/cm2) or Roll Bulk in cc/g=0.785.times.(Roll Diameter squared in cm2-outer Core Diameter squared in cm2)/(Sheet length in cm.times.sheet count.times.Basis Weight in g/cm2).
The Kershaw Test is a test used for determining roll firmness. The Kershaw Test is described in detail in U.S. Pat. No. 6,077,590 to Archer, et al., which is incorporated herein by reference. The apparatus is available from Kershaw Instrumentation, Inc., Swedesboro, N.J., and is known as a Model RDT-2002 Roll Density Tester. During the test, a rolled product is placed on a spindle on a traverse table. The motion of the traverse table causes a sensing probe to make contact with the towel or bath tissue roll. The instant the sensing probe contacts the roll, the force exerted on the load cell will exceed the low set point of 6 grams and the displacement display will be zeroed and begin indicating the penetration of the probe. When the force exerted on the sensing probe exceeds the high set point of 687 grams, the value is recorded. After the value is recorded, the traverse table will stop and return to the starting position. The displacement display indicates the displacement/penetration in millimeters. The tester will record this reading. Next the tester will rotate the tissue or towel roll 90 degrees on the spindle and repeat the test. The roll firmness value is the average of the two readings. The test needs to be performed in a controlled environment of 73.4.+−.1.8 degrees F. and 50.+−0.2% relative humidity. The rolls to be tested need to be introduced to this environment at least 4 hours before testing.
The tensile test that was performed used tissue samples that were conditioned at 23.degree. C..+−0.1.degree. C. and 50%.+−0.2% relative humidity for a minimum of 4 hours. The samples were cut into 3 inch wide strips in the machine direction (MD) and cross-machine direction (CD) using a precision sample cutter model JDC 15M-10, available from Thwing-Albert Instruments, a business having offices located in Philadelphia, Pa., U.S.A.
The gauge length of the tensile frame was set to four inches. The tensile frame was an Alliance RT/1 frame run with TestWorks 4 software. The tensile frame and the software are available from MTS Systems Corporation, a business having offices located in Minneapolis, Minn., U.S.A.
A 3″ strip was then placed in the jaws of the tensile frame and subjected to a strain applied at a rate of 25.4 cm per minute until the point of sample failure. The stress on the tissue strip is monitored as a function of the strain. The calculated outputs included the peak load (grams-force/3″, measured in grams-force), the peak stretch (%, calculated by dividing the elongation of the sample by the original length of the sample and multiplying by 100%), the % stretch@500 grams-force, the tensile energy absorption (TEA) at break (grams-force*cm/cm.sup.2, calculated by integrating or taking the area under the stress-strain curve up the point of failure where the load falls to 30% of its peak value), and the slope A (kilograms-force, measured as the slope of the stress-strain curve from 57-150 grams-force).
Each tissue code (minimum of five replicates) was tested in the machine direction (MD) and cross-machine direction (CD). Geometric means of the tensile strength and tensile energy absorption (TEA) were calculated as the square root of the product of the machine direction (MD) and the cross-machine direction (CD). This yielded an average value that is independent of testing direction.
Elastic Modulus (Maximum Slope) E(kg.sub.f) is the elastic modulus determined in the dry state and is expressed in units of kilograms of force. TAPPI conditioned samples with a width of 3 inches are placed in tensile tester jaws with a gauge length (span between jaws) of 4 inches. The jaws move apart at a crosshead speed of 25.4 cm/min and the slope is taken as the least squares fit of the data between stress values of 57 grams of force and 150 grams of force. If the sample is too weak to sustain a stress of at least 200 grams of force without failure, an additional ply is repeatedly added until the multi-ply sample can withstand at least 200 grams of force without failure. The geometric mean modulus or geometric mean slope was calculated as the square root of the product of the machine direction (MD) and the cross direction (CD) elastic moduli (maximum slopes), yielding an average value that is independent of testing direction.
The following results were obtained. As shown below, roll bulk was varied between about 2 cc/g to about 14 cc/g.
125.5
It should be understood that the invention includes various modifications that can be made to the exemplary embodiments of the center/surface rewinder/winder described herein as come within the scope of the appended claims and their equivalents. Further, it is to be understood that the term “winder” as used in the claims is broad enough to cover both a winder and a rewinder
The present application claims priority to and is a continuation-in-part application of U.S. patent application Ser. No. 11/930,977, filed on Oct. 31, 2007, which is a continuation-in-part application of U.S. patent application Ser. No. 11/799,043, filed on Apr. 30, 2007, which is a continuation-in-part application of U.S. patent application Ser. No. 10/085,813, filed on Feb. 28, 2002.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11930977 | Oct 2007 | US |
| Child | 12750380 | US | |
| Parent | 11799043 | Apr 2007 | US |
| Child | 11930977 | US | |
| Parent | 10085813 | Feb 2002 | US |
| Child | 11799043 | US |
