Patent Application
20090114360
The present invention relates to a papermaking raw material processor, adapted to reform papermaking raw materials before served to a paper machine or more particularly to deink waste paper.
Papermaking process consists mainly of chemically processing woodchips to pulp them, followed by subjecting it to a paper machine and drying it. Before subjecting it to a paper machine, pulp is disaggregated in water, e.g. beaten to remove impurities. Incidentally, endeavors are being made, mainly for the sake of savings in resources, to recycle used paper into pulp to manufacture recycled paper. Such recycled pulp, as additive to put in the above prior step in accordance with the quality of paper to make, needs to undergo a deinking step in which printing ink on the used paper is separated and removed from pulp fiber before added in the prior step. Conventionally, such deinking process involves use e.g. of a kneader taking advantage of friction among fibers, a disperser by means of shearing force of blade and fibers in order to detach ink from fibers, however, making troubles such as aggravated damage of fibers, reattachment of detached ink to fibers, etc., resulting in limited applications of recycled paper such as newspapers, corrugated fiberboard, etc.
On the other hand, when applied e.g. to mechanical paper as subjected to high degree whiteness processing, it requires chemicals, also controlling the temperature of the processing with chemicals, with the risks of complicating the deinking process or pushing up the costs. Moreover, undetachable substances such as toner, UV resin ink, etc. used e.g. for a copying machine are more and more mixed, with diversification of waste papers, resulting in the risks of giving more mechanical burden e.g. on a kneader, while facing problems such as degraded strength, dimensional stability, curls, etc. due to shortened fibers per se, a higher content of fine fibers, twisted fibers, etc.
To cope with the above problems, the Applicant proposed to make use of cavitation jet technique for reforming processing (see patent document 1). With this pulp processor, cavitation bubbles are actively introduced into pulp suspension at the step of manufacturing recycle pulp from used paper in order to remove polluting substances such as ink from pulp fibers, inorganic particles, etc. thanks to the intensive impact when the cavitation bubbles collapse.
Patent document 1: International Publication WO 2005/012632 A1
It has been recognized that the pulp processor disclosed in the above patent document 1 can improve whiteness, less damaging the fibers, without needing chemical processing or temperature control, enabling low-concentration processing with sterilization without reattachment or imprinting of detached ink.
Then, the present invention has an object of offering a papermaking raw material processor enabling the above pulp processor to be installed in pulp manufacturing process.
As technical means to attain the above object, the present invention relates to a papermaking raw material processor, bringing cavitation bubbles generated by cavitation into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles, characterized in that it comprises: a processing unit to supply suspension containing the papermaking raw material and to generate cavitation; a pump to generate pressure to jet the suspension into the processing unit; a jet to jet the suspension and generate the cavitation bubbles by the jet stream; and a tank to store the suspension, and that the suspension is jetted from the pump via the jet into the processing unit to feed the papermaking raw material, processed in the processing unit, to the downstream steps or to return it to the supply tank.
In other words, suspension is jetted into the processing unit from the jet in the form of a nozzle, orifice pipe, venturi tube, etc. to generate cavitation, thereby carrying, out a processing thanks to collapse of cavitation bubbles, inside the processing unit. Processed liquid discharged from the processing unit after subjected to reforming by cavitation is fed to downstream steps, when usable as it is, or returned to the supply tank, when not sufficiently processed yet, to be jetted again to the processing unit to be further reformed. Processing at processing unit should be repeated a sufficient number of times for papermaking raw material to be obtained in desired conditions, in accordance with the pressure to jet suspension, generation of cavitation at processing unit, etc. Then, suspension to be used for reforming is fed to the supply tank. When batch processing is performed, collecting used liquid after a required number of times repetitions of processing at processing unit, this feeding operation is performed, on completion of processing, but when it is performed, while collecting used liquid, an equivalent amount of suspension as collected is continuously fed.
Processing of papermaking raw material, thanks to cavitation, according to the present invention, here mentioned, involves steps of using cavitation to generate cavitation bubbles in suspension containing papermaking raw material, bringing the cavitation bubbles into contact with papermaking raw material contained in suspension, in order to process pulp fibers. For example, it involves steps of beating pulp fibers to achieve a desired freeness and improve the strength, preparing a hydrophilic surface of pulp fiber, external fibrillation of pulp fiber, and deinking steps of removal of hydrophobic substances such as ink attached to the pulp, decomposition of organic coloring ingredients, etc.
On the other hand, cavitation processing according to the present invention covers pulps made from softwoods, hardwoods, fibers other than timber, etc. more specifically, such as chemical pulp e.g. like kraft pulp, mechanical pulp e.g. like groundwood pulp, thermo mechanical pulp or e.g. recycled pulp made from waste paper e.g. like newspaper or flyer, ground wood paper, coated paper, thermosensible paper, pressure sensitive paper, simili, colored wood free paper, electrophotographic transfer paper, computer output paper, waste paper of their mixture or any material containing cellulosic fibers.
The papermaking raw material processor according to the invention of claim 2 is characterized in that the pump is a high-pressure pump.
It means that pump suspension is jetted with a high-pressure for the purpose of efficient generation of controllable cavitation.
The papermaking raw material processor according to the invention of claim 3 is characterized in that it comprises discharging pressure regulating means to detect the pressure of the suspension jetted from the discharging outlet of the pump and to control the pump discharging pressure, based on the detected value.
It has means to regulate the discharging pressure of the pump in order that the pump should discharge at a pressure kept appropriate for generation of cavitation. For example, it detects the discharging pressure and sets a pressure regulator.
The papermaking raw material processor according to the invention of claim 4 brings cavitation bubbles generated by cavitation into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles and is characterized in that it comprises: a processing unit to supply suspension containing the papermaking raw material and to generate cavitation; a first pump to generate pressure to jet the suspension into the processing unit; a jet, communicating with the first pump, to jet the suspension and generate the cavitation bubbles by the jet stream; a tank to store the suspension; and a second pump to circulate in the supply tank the suspension stored in the supply tank, while feeding it to the processing unit and that the suspension is jetted from the first pump via the jet into the processing unit to feed the suspension from the supply tank to the processing unit thanks to the second pump to bring it in contact with cavitation bubbles generated inside the processing unit to feed the papermaking raw material, processed in the processing unit, to the downstream steps or to return it to the supply tank.
That is to say, suspension to reform is jetted into a processing unit and jet liquid is jetted onto the suspension in order to generate cavitation. The jet liquid can be fresh water, reused water collected during papermaking process, pressed-pulp water, white water, pulp suspension, etc. The suspension is fed to the supply tank and the jet liquid is fed to the first pump to be jetted into the processing unit by the first pump. On the other hand, the suspension is jetted with the second pump into the processing unit. The jet liquid and the suspension collide against each other in the processing unit, while processed by the blast when the cavitation bubbles collapse.
The papermaking raw material processor according to the invention of claim 5 brings cavitation bubbles generated by cavitation into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles and is characterized in that it comprises: a processing unit to supply suspension containing the papermaking raw material and to generate cavitation; a first supply tank to store jet liquid; a second supply tank to store the suspension; a first pump, communicating with the first supply tank at the suction inlet and with the second supply tank at the discharging outlet to generate pressure to jet the suspension into the processing unit; a jet, communicating with the first pump, to jet the suspension and generate the cavitation bubbles by the jet stream; and a second pump communicating with the second supply at the suction inlet and with the processing unit at the discharging outlet and that the jet liquid is jetted into the processing unit via the jet via the first pump, while feeding the suspension from the second pump into the processing unit to bring it in contact with cavitation bubbles generated inside the processing unit in order to feed the papermaking raw material, processed in the processing unit, to the downstream steps or to return it to the second supply tank.
In other words, it is equipped with a first supply tank for jet liquid and a second supply tank for suspension. A tank other than that for suspension was arranged for convenience of continuous supply of pressed-pulp water or white water i.e. liquid generated during papermaking process and temporarily in store before used, even though the jet liquid can also be e.g. fresh water, as already explained.
The papermaking raw material processor according to the invention of claim 6 is characterized in that it is switchable to put the first and second supply tanks in communication with each other or to separate them from each other.
When only suspension is jetted into the processing unit to generate cavitation, the first and second tanks are put in communication. On the other hand, to jet the suspension and jet liquid, those first and second tanks are separated from each other to store the suspension and the jet liquid separately.
The papermaking raw material processor according to the invention of claim 7 brings cavitation bubbles, generated by cavitation, into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles and is characterized in that it comprises: a processing unit to supply suspension containing the papermaking raw material and to generate cavitation; a first supply tank to store jet liquid; a second supply tank to store the suspension; a first pump, communicating with the first supply tank at the suction inlet and with the second supply tank at the discharging outlet to generate pressure to jet the suspension into the processing unit; a jet, communicating with the first pump, to jet the suspension and generate the cavitation bubbles by the jet stream; a second pump communicating with the second supply at the suction inlet and with the processing unit at the discharging outlet; and a piping communicating the second supply tank and the suction inlet of the second pump with a piping receiving the process raw material, thereby feeding the process raw material to the second supply tank and that the jet liquid is jetted into the processing unit via the jet via the first pump, while feeding the suspension from the second pump into the processing unit to bring it in contact with cavitation bubbles generated inside the processing unit in order to feed the papermaking raw material, processed in the processing unit, to the downstream steps or to return it to the second supply tank.
The papermaking raw material processor according to the invention of claim 8 brings cavitation bubbles, generated by cavitation, into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles and is characterized in that it comprises: a processing unit to supply suspension containing the papermaking raw material and to generate cavitation; a first pump to generate pressure to jet the suspension into the processing unit; a jet, communicating with the first pump, to jet the suspension and generate the cavitation bubbles by the jet stream; a tank to store the suspension; and a second pump to circulate in the supply tank the suspension stored in the supply tank, and that the suspension is fed from the supply tank by the second pump to the suction inlet of the first pump to jet therefrom the suspension to the processing unit via the jet, to feed the papermaking raw material, processed in the processing unit, to the downstream steps or to return it to the supply tank.
In other words, the papermaking raw material processor according to the invention of claim 7 or 8 is adapted to jet suspension into the processing unit to generate cavitation, thereby performing a reforming processing, thanks to collapse of cavitation bubbles, inside this processing unit. This construction enables, unlike the papermaking raw material processor according to the invention of claim 1, change of mode to process suspension, thanks to the presence of two pumps that can be actuated or stopped or work with changed duct lines.
The papermaking raw material processor according to the invention of claim 9 is characterized in that it comprises discharging pressure regulating means to detect the pressure of the suspension jetted from the discharging outlet of the first pump and to control the pump discharging pressure, based on the detected value.
Such discharging pressure regulating means has been arranged for the first pump to jet suspension at a discharging pressure maintained appropriate to generate cavitation. For example, discharging pressure is detected to place a pressure regulator. Then, the jet liquid should preferably be jetted at a discharging pressure of 0.01 to 60 MPa, more preferably 0.5 to 30 MPa. Cavitation cannot be sufficiently generated at a discharging pressure less than 0.01 MPa, while a pressure higher than 60 MPa requires a special pump or pressure container, consuming more energy to push up costs disadvantageously, also damaging too much the pulp fibers that are not appropriately used as papermaking raw material any more.
The papermaking raw material processor according to the invention of claim 10 is characterized in that it comprises outlet pressure regulating means to seal the processing unit, detect the outlet pressure of the processing unit, and to control the pressure inside the processing unit, based on the detected value.
The papermaking raw material processor according to the invention of claim 11 is characterized in that the first pump is a high-pressure pump and the second pump is a fixed delivery pump.
Jet liquid is jetted with a high-pressure pump to generate cavitation, thereby jetting thus generated cavitation bubbles to the suspension jetted from a fixed delivery pump.
The papermaking raw material processor according to the invention of claim 12 is characterized in that the processing unit comprises a plurality of jets tilted so as to jet the suspension to the processing unit in a direction toward the downstream side of the processing unit, relative to the axial direction of the processing unit.
The processing unit supplies suspension to reform on one side and discharges processed liquid on the other side, for the suspension to flow from the supplying upstream to discharging downstream. Then, the suspension is jetted in a direction tilted relative to the direction of this flow, making the suspension, jetted from the respective jets, collide inside the processing unit. This collision collapses cavitation bubbles, formed by cavitation, to act on papermaking raw material in suspension. Cavitation is generated, as suspension is jetted at high pressure.
The papermaking raw material processor according to the invention of claim 13 is characterized in that the processing unit comprises a plurality of jets directed so as to jet the suspension to the processing unit in a direction almost parallel with the axial direction of the processing unit.
The direction to jet suspension is made parallel with the flowing direction inside the processing unit. The suspension hardly collides inside the processing unit, enabling smooth flow, thereby shortening the processing time inside the processing unit. Cavitation is generated, as suspension is jetted at high pressure.
The papermaking raw material processor according to the invention of claim 14 is characterized in that the processing unit comprises a plurality of parallel jets directed in a direction almost parallel with the axial direction of the processing unit and a plurality of jets tilted so as to direct the jet stream in a direction toward the center of the processing unit.
This construction is made to bring the suspension and the jet liquid in collision to each other. For example, cavitation bubbles generated by jetting of jet liquid are brought into collision with papermaking raw material in suspension to collapse and process the cavitation bubbles.
The papermaking raw material processor according to the invention of claim 15 is characterized in that the parallel jets are arranged on the upstream wall body of the processing unit and the tilted jets are disposed on the sidewall of the processing unit at appropriate intervals in the direction of the jet stream.
This construction provides a plurality of points to bring the suspension and the jet liquid into collision to each other. For example, suspension jetted from parallel jets is brought into collision with jet liquid jetted from tilted jets, a plurality of times during its flow inside the processing unit, thereby subjecting the papermaking raw material in suspension to the blast of collapsing cavitation bubbles generated by cavitation.
The papermaking raw material processor according to the invention of claim 16 is characterized in that the parallel jets jet the suspension and the tilted jets jet the jet liquid.
A mode of bringing the suspension and jet liquid into collision to each other is realized by this construction in which jet liquid is jetted in a slanting direction to suspension flowing in the direction of flow in the processing unit to bring them into collision.
The papermaking raw material processor according to the invention of claim 17 is characterized in that the processing unit comprises a plurality of parallel jets directed in a direction almost parallel with the axial direction of the processing unit, for an appropriate number of the parallel jets to jet the suspension and the rest of the jets to jet the jet liquid.
In other words, suspension and jet liquid are jetted along the flow direction of the processing unit.
The papermaking raw material processor according to the invention of claim 18 is a papermaking raw material processor, bringing cavitation bubbles generated by cavitation into contact with papermaking raw material in suspension to process the papermaking raw material with intensive impact from collapse of the cavitation bubbles, characterized in that it comprises a processing unit to supply suspension containing the papermaking raw material and to generate cavitation, the processing unit comprising: axially-directed central jet pipes, each with a nozzle, placed at the inlet of the processing unit; marginal jet pipes disposed at a plurality of points on the circumference around the axis; and surrounding wall jet pipes disposed on the surrounding wall of the processing unit, tilted relative to the axis, while directed toward downstream in the flowing direction inside the processing unit, allowing the suspension and the jet liquid to be jetted from any of the central jet pipes, marginal jet pipes or surrounding wall jet pipes at choice.
In other words, a plurality of jets different in jetting direction are arranged at a plurality of points at processing unit, allowing choice among such jets to modify the jetting mode in accordance with the quality of papermaking raw material depending e.g. on the kind of tree, waste paper, etc.
The papermaking raw material processor according to the invention of claim 19 is characterized in that a plurality of surrounding wall jet pipes are arranged at appropriate intervals on the surrounding wall of the nozzle short pipe, such nozzle short pipes are detachable from each other, allowing a given number of nozzle short pipes to be axially arranged.
It means that the number of jets disposed on the wall body of the processing unit for jetting in a slanting direction can be modified.
The papermaking raw material processor according to the present invention can make an efficient use of cavitation in processing inside a processing unit, enabling it to be installed in pulp manufacturing process.
The papermaking raw material processor according to the invention of claim 2 or 9 can jet the suspension into the processing unit at a high pressure, assuring generation of cavitation.
The papermaking raw material processor according to the invention of claim 3 can jet suspension into the processing unit at a pressure kept constant, thereby enabling constant processing.
The papermaking raw material processor according to the invention of claim 4 can efficiently bring cavitation bubbles into contact with papermaking raw material in the suspension, thanks to jet liquid jetted into the suspension inside the processing unit, thereby improving efficiency in processing.
The papermaking raw material processor according to the invention of claim 5 can store pressed-pulp water, white water, etc. discharged from pulp manufacturing process to use it as jet liquid, in order to assure continuous jet of jet liquid into the processing unit, thereby enabling efficient reuse of different kinds of water used and discharged during pulp manufacturing process, as well as continuous processing on installing such papermaking raw material processor in pulp manufacturing process.
The papermaking raw material processor according to the invention of claim 6 can generate cavitation only with suspension or by jetting jet liquid into suspension, on an optional basis, in order to perform processing in accordance with the quality of paper for a paper machine to make.
The papermaking raw material processor according to the invention of claim 7 or 8 can be installed in pulp manufacturing process for efficient use of cavitation in processing in a processing unit.
The papermaking raw material processor according to the invention of claim 10 can maintain constant pressure inside the processing unit to perform constant processing.
The papermaking raw material processor according to the invention of claim 11 generates cavitation from jet liquid jetted from a high-pressure pump and collide it onto suspension jetted from a fixed delivery pump, thereby assuring generation of cavitation and contact of generated cavitation bubbles with papermaking raw material.
The papermaking raw material processor according to the invention of claim 12 or 13 is adapted to generate cavitation by jetting suspension, thereby realizing a processor of simple structure.
The papermaking raw material processor according to the invention of claim 14 is adapted to jet so as to collide the jet liquid onto the suspension, thereby facilitating for cavitation bubbles generated by a jet of jet liquid to get into contact with papermaking raw material in suspension to improve efficiency in processing.
The papermaking raw material processor according to the invention of claim 15 can generate cavitation effects with a plurality of repetitions, going through the processing unit, thereby e.g. assuring removal of ink or the like from papermaking material after a plurality of repetitions of processing.
The papermaking raw material processor according to the invention of claim 16 can bring the suspension into contact with cavitation bubbles with a plurality of repetitions, thereby e.g. assuring removal of ink or the like from papermaking material after a plurality of repetitions of processing.
The papermaking raw material processor according to the invention of claim 17 can lengthen the time to keep the suspension and the jet liquid in contact with each other, thereby subjecting the papermaking raw material to sufficient reforming processing.
The papermaking raw material processor according to the invention of claim 18 can jet the suspension or the jet liquid from a jet chosen in accordance with the quality of the papermaking raw material, in order to realize the best processing.
The papermaking raw material processor according to the invention of claim 19 can change the number of jets to use in accordance with the amount of suspension to process, enabling optimum arrangement in papermaking process.
Now, the papermaking raw material processor will be explained more specifically, referring to an illustrated preferred embodiment.
First tank 3 communicates with the suction side of first pump 5, as introduced by inlet piping 3h. This first pump 5 is a plunger-type high-pressure pump. This first pump 5 should preferably have a discharge pressure of 0.5 MPa or more, keeping the inlet pressure at processing unit 2 more than 0.5 MPa, to prevent the efficiency in generation of cavitation bubbles from lowering. Inlet piping 3h has, on its way, intake 3i for sampling. First pump 5 communicates, on its discharging side, with the inlet of processing unit 2 via inlet piping 5a. On the other hand, first pump 5 has, on its discharging side, pressure regulating valve 5b which is opened, when first pump 5 discharges at a pressure higher than preset, to return a part of discharge to first tank 3 via piping 5c. Piping 5c has, on its way, flowmeter 5f, while inlet-piping 5a has, on its way, manometer 5d.
The second pump 6 communicates, on its suction side, with the second tank. This second pump 6 is a constant-volume pump. This second pump 6 communicates, on its discharging side, with the inlet of the processing unit 2 via piping 6a. This piping 6a has, on its way, branch pipe 6b for first tank 3 to be supplied with discharged liquid via open/close valve 6c. Piping 6a is equipped with flowmeter 6d, intake 6e, open/close valve 6f and manometer 6g. First tank 3 and second tank 4 are connected with each other by communication piping 7 having, on its way, open/close valve 7a that can be opened to enable communication.
Processing unit 2 is connected, at its outlet, with outlet piping 8 via which the liquid is returned to second tank 4, after reformed through processing unit 2. Outlet piping 8 is equipped with, in the order of the flow, manometer 8a, open/close valve 8b, intake 8c, open/close valve 8d, flowmeter 8e and liquid-level regulating valve 8f. Branch point 9 is connected at the middle point position between intake 8c and open/close valve 8d and equipped with check valve 9a and open/close valve 9b via which processed liquid is fed to downstream. Branch pipe 10 equipped with check valve 10a and open/close valve 10b is connected between open/close valve 8d and flowmeter 8e, in order that suspension to process or injection liquid is fed to tank 4 via branch pipe 10. Second tank 4 has liquid-level detecting/regulating meter 4a, which detects the liquid level in second tank 4, opens or closes liquid-level regulating valve 8f, in accordance with the detected liquid level to regulate the flow, thereby keeping the liquid level constant in second tank 4.
Now, the second embodiment of the present invention will be explained, referring to
Inlet flange 2a has, at its center, central nozzle pipe 2f i.e. parallel jet, and a plurality of marginal nozzle pipes 2g i.e. parallel jets there around. These central nozzle pipe 2f and marginal nozzle pipes 2g are all directed with their tips from the inlet (upstream) toward the outlet (downstream) of processing unit 2 i.e. in parallel with the direction of axis O of processing unit 2 toward the outlet. Then, central nozzle pipe 2f has a venturi tube 2h that may be replaced with an orifice. To this inlet flange 2a, inlet short pipe 2b is connected via a flange.
To inlet short tube 2b, nozzle short tube 2c is connected via a flange. Nozzle short pipe 2c has, at four parts around itself, as shown in
The above outlet short pipe 2d has ventilation pipe 2k to evacuate air held up inside processing unit 2. In this embodiment, processing unit 2 is placed with its axis O kept more or less horizontal, requiring the presence of ventilation pipe 2k. However, ventilation pipe 2k is not needed when the axis O is kept almost vertical.
Outlet flange 2e has, in an eccentric position, outlet pipe 2j, from which suspension carrying e.g. pulp is evacuated after reformed going through processing unit 2.
As will be explained later, processing unit 2 may have inside itself an unillustrated baffle plate to intercept a jet from the nozzle. This baffle plate should preferably be set to provide to the inner wall face of processing unit 2 a gap in the order of 1 to 5 mm, enabling generation of cavitation by a jet from the nozzle, to generate second cavitation by going through the gap.
To jet the suspension of pulp fibers, nozzle tip 11a should preferably an inner diameter of 0.5 to 5.0 mm. An inner diameter smaller than 0.5 mm tends to congest with pulp fibers, also requiring processing at lower concentration to take longer time to process unit raw material and to consume more electric power. On the other hand, if greater than 5.0 mm, it lowers the efficiency in generation of cavitation, with the risk of failing to achieve the desired efficiency in reforming processing. The inner shape of nozzle tip 11a is not necessarily required to be circular. Nozzle tip 11a should preferably have a wall thickness of 1.5 mm to about three times greater than the inner diameter. If smaller than 1.5 mm, it threatens the strength against the high-pressure supply of suspension.
For quick maintenance, it should preferably have a structure, like this embodiment, in which nozzle tip 11a is replaceable when worn out.
In both of the first and second embodiments of papermaking raw material processors 1 and 20 respectively, first pump 5 has inlet piping 5a, on the discharge side, connected with marginal nozzle pipe 2g and surrounding wall nozzle pipe 2i, with open/close valves 31, 32a, 32b, 32c, 32d set on the respective duct lines, allowing adjustment of connection with the discharging outlet of first pump 5. On the other hand, second pump 6 is connected, at its discharging outlet, with central nozzle pipe 2f.
Explanation will be made about the working of the papermaking raw material processor according to the mode of realization of the present invention constructed as above.
In the case as shown in
In the case as shown in
In the case as shown in
In the case as shown in
In the case of batch processing in forming duct lines as shown in
Suspension, processed going through processing unit 2, is returned to second tank 4 through outlet piping 8. Consequently, suspension stored in second tank 4 is circulated between this second tank 4 and processing unit 2 to be processed each time going through processing unit 2. As the suspension has been appropriately reformed, open/close valve 9b is opened, while closing open/close valve 8d, in order to feed processed liquid from piping 9 to downstream operations.
In the case of forming duct lines as shown in
In the case of forming duct lines as shown in
In the case of papermaking raw material processor 20 according to the second embodiment, forming duct lines as shown in
In the case of papermaking raw material processor 1 according to the first embodiment, forming duct lines as shown in
Thanks to the schemes as shown in
In the case of intimate contact between a valve and a valve seat placed at a suction inlet, the close contact must be assured, since the first pump 5 is a high-pressure pump. However, when this first pump 5 is supplied with suspension containing pulps, pulp fibers may be attached to the driving coil spring to keep the close contact of the valve or even entangled there.
Nozzle 11 may also be clogged up with pulp fibers contained in suspension, jammed in nozzle tip 11a having a small inner diameter, requiring removal of the pulp fibers from nozzle tip 11a. Then, the nozzle should be shaped to prevent pulp fibers from being jammed.
For example, as shown in
Now, referring to diagrammatic sketches as shown in
On the other hand, as shown in
Explanation has been made about the above-explained embodiment, referring to a single line but a plurality of lines should preferably be arranged in parallel to perform reforming processing to enable quick response to increase or decrease in processing amount, when this papermaking raw material processor is actually installed.
The present invention relates to a papermaking raw material processor capable of simplifying the reforming step in the paper making process, while less damaging the fiber, in order to supply, to the filtering step, long-fiber pulp, thereby facilitating reuse of used paper and contributing to savings in resources by effective use of the paper.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2005-321231 | Nov 2005 | JP | national |
| Filing Document | Filing Date | Country | Kind | 371c Date |
|---|---|---|---|---|
| PCT/JP2006/321997 | 11/2/2006 | WO | 00 | 4/28/2008 |
