JP2011241491A - Dewatering device for wet paper and waste paper-recycling apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dewatering device for wet paper and a waste paper-recycling apparatus which can prevent decrease of water absorption efficiency of a water absorption part at a press roller.SOLUTION: A dewatering device for wet paper P comprises: dewatering belts 12, at least one of which is formed from a material having water permeability; a press roller 17 which is placed on the inward side of the dewatering belt 12 which is formed from a material having water permeability and provided with a water absorption part 37 to absorb water caused by nip pressing wet paper 64 on outer periphery of which; and nip pressure set and release means 27 which set a pair of press rollers 16, 17 to nip wet paper 64 at a predetermined pressure when operating dewatering of the wet paper 64, and release the nip pressure upon operation stop. The press roller 17 provided with the water absorption part 37 is accommodated in a drawer unit 90 which is placed on the inward side of the dewatering belt 12, and the drawer unit 90 is configured to be detachable to the device body 28 when releasing a nip pressure.

Description

  The present invention relates to a wet paper dewatering device and a used paper recycling apparatus.

Conventionally, there is known a wet paper dewatering device that dehydrates and dries a wet paper obtained by making a paper raw material liquid. Patent Document 1 listed below is composed of a pair of upper and lower parts made of felt or the like and having water absorption. A technique is disclosed in which a wet paper web is sandwiched between dewatering belts, and the wet paper web is sucked and pinched by a suction roller for dehydration.

Since this dewatering device uses a very large suction device for pinching and dewatering while sucking with a suction roller, a large space is required to install this suction device, and the entire used paper recycling apparatus is large. This is the cause of

Therefore, in Patent Document 2 below, dewatering is performed by a press roller having a dewatering layer instead of the suction roller. Since the dewatering layer can absorb the water generated by the pressure of the wet paper, it is not necessary to install a large suction device, and the device can be downsized.

Japanese National Patent Publication No. 9-506937 JP 2008-174877 A

However, in the dehydration apparatus described in Patent Document 2, the dehydration layer is made of a porous material having fine continuous pores. Such a material is easily deteriorated, and the water absorption is reduced within a short period of time. There is a problem that it ends up.

The present invention solves the above-described problems, and an object of the present invention is to provide a wet paper paper dewatering device and a used paper recycling processing device that can improve the reduction in water absorption efficiency of a water absorption portion provided in a press roller.

  In order to achieve the above object, the wet paper web dewatering device according to claim 1 includes a pair of endless dewatering belts that sandwich and transport wet paper webs in the wet state, and an inner side of the pair of dewatering belts, respectively. And a pair of press rollers for narrowing the wet paper sandwiched between the pair of dewatering belts through the dewatering belt, and at least one of the dewatering belts is formed of a material having water permeability, A wet paper web dewatering device is provided with a water absorbing portion that absorbs moisture generated by clamping the wet paper web on the outer peripheral surface of the press roller installed inside the dewatering belt formed by the material having A pair of press rollers is set to hold the wet paper at a predetermined pressure during the dehydrating operation of the wet paper, and is provided with a holding pressure setting releasing means for releasing the holding pressure when the operation is stopped, and is provided with a water absorption portion. Roller is housed in the drawer unit provided inwardly of dewatering belt having a water-permeable, the drawer unit when releasing the clamping pressure, are the configuration which is provided detachably with respect to the apparatus main body.

According to a second aspect of the present invention, in the wet paper web dewatering device according to the first aspect, the drawer unit is pulled out along the axial direction of the press roller with respect to the apparatus main body.

According to a third aspect of the present invention, there is provided the wet paper web dewatering device according to the first or second aspect, wherein the nipping pressure setting release means is on the side of the dewatering belt in the width direction and the wet paper web is conveyed. It is provided on the side plate of the drawer unit arranged along the direction.

  Further, according to a fourth aspect of the present invention, in the wet paper web dewatering device according to the first or second aspect, the nipping pressure setting releasing means pivotally supports the rotating shaft of a press roller having a water absorbing portion, and the guide Are provided with a slidable contact plate for sliding contact with the side plate of the drawer unit and a slidable sliding drive unit for sliding the slidable contact plate for clamping along the side plate.

Furthermore, the invention according to claim 5 is a used paper pulp liquid production apparatus for producing a used paper pulp liquid by stirring the used paper together with water supplied from a water supply unit, and a used paper pulp liquid produced by the used paper pulp liquid production apparatus. The wet paper web forming apparatus that forms the wet paper with the paper making wire and the wet paper web dewatering apparatus according to claim 1 or 4 for dehydrating the wet paper web formed by the wet paper web forming apparatus. The present invention relates to a used paper recycling apparatus.

The wet paper web dewatering device according to claim 1 sets the pair of press rollers so as to pinch the wet paper at a predetermined pressure during the wet paper spin-drying operation and also sets the clamping pressure to release the pinching pressure when the operation is stopped. A press roller provided with a release means and provided with a water absorbing portion is accommodated in a drawer unit provided inside a water-permeable dewatering belt, and the drawer unit is detachably provided to the apparatus main body. Therefore, the clamping pressure setting release means releases the pressing pressure of the press roller when the wet paper web dehydration operation is stopped, and the press roller with reduced water absorption can be replaced very easily by pulling out the press unit. It is possible to improve the decrease in water absorption efficiency of the water absorption portion provided on the roller.

  According to the second aspect of the present invention, since the drawer unit is pulled out along the axial direction of the press roller with respect to the apparatus main body, it can be pulled out while maintaining the posture of the press roller. Can be easily replaced.

Further, the clamping pressure setting canceling means according to claim 3 is provided on the side plate of the drawer unit disposed in the width direction of the dewatering belt and along the conveyance direction of the wet paper web. The operation of the means can be easily performed, and it is possible to quickly face even when a problem occurs.

  Further, according to the invention described in claim 4, the clamping pressure setting releasing means supports the rotating shaft of the press roller having the water absorption portion, and is slidably contacted with the side plate of the drawer unit while being guided by the guide. Equipped with a plate and a sliding drive unit for clamping the sliding contact plate for clamping along the side plate, it is easy to set and release the wet paper web clamping pressure of the press roller to the optimum size. This can be easily performed using a simple structure.

Furthermore, according to invention of Claim 5, the used paper pulp liquid manufacturing apparatus which stirs used paper with the water supplied from the water supply part, and manufactures a used paper pulp liquid, and the used paper manufactured with the said used paper pulp liquid manufacturing apparatus A wet paper forming apparatus that forms pulp with a paper making wire to form a wet paper, and a wet paper dewatering apparatus according to claim 1 or 4 that dehydrates the wet paper formed by the wet paper forming apparatus. Since it is integrated, when the waste paper recycling unit is shut down, the pressure of the wet paper web by the press roller is released and the drawer unit is removed from the main unit, so that the press roller can be easily replaced and the dewatering efficiency of the dewatering device can be restored. It is possible and the quality of the recycled paper obtained can be improved.

1 is a schematic configuration diagram of a used paper recycling processing apparatus according to an embodiment of the present invention. It is the schematic which shows the internal structure of the used paper pulp liquid manufacturing part of the said used paper reproduction | regeneration processing apparatus. It is the top view and sectional drawing of the deinking process part of the said used paper reproduction | regeneration processing apparatus. It is the block schematic diagram of the wire apparatus of the said used paper reproduction | regeneration processing apparatus. FIG. 2 is a schematic configuration diagram of a wet paper web dewatering device of the used paper recycling apparatus. It is the block schematic diagram of the drying apparatus of the wet paper of the said used paper recycling processing apparatus. It is an expansion perspective view of the drawer | drawing-out unit of the said dehydrator. It is the elements on larger scale of the said dehydration apparatus. It is a disassembled perspective view of the press roller of the said dehydration apparatus, a squeezing member, clamping pressure setting cancellation | release means, and squeezing pressure setting cancellation | release means. It is the elements on larger scale of the said dehydration apparatus. It is the schematic of the drive part of the said dehydration apparatus.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a used paper recycling apparatus according to the present invention. In FIG. 1, a used paper recycling apparatus 100 is integrally provided with a used paper pulp liquid production unit 1, a deinking pulp unit 2, a paper making unit 3, a finishing unit 4, and a drainage processing unit 5.

The waste paper pulp liquid production unit 1 is for producing waste paper pulp by breaking the waste paper 6, and the deinking pulp part 2 is for deinking the waste paper pulp produced in the waste paper pulp liquid production part 1. The paper making unit 3 makes paper from the deinked pulp obtained in the deinking pulp unit 2, and the finishing unit 4 performs finishing by cutting the recycled paper before finishing made in the paper making unit 3. Thus, recycled paper 7 is obtained.

(Waste Paper Pulp Production Department)
FIG. 2 is a schematic diagram showing the internal structure of the waste paper pulp liquid production unit 1. The used paper pulp liquid manufacturing unit 1 is constituted by a used paper pulp liquid manufacturing apparatus W and includes a pulper 18. The pulper 18 disintegrates the waste paper 6 into fibers, that is, waste paper pulp, in water and a disintegration accelerator liquid.

The pulper 18 is provided with a stirring tank 181 into which used paper 6 is charged, a water supply unit 182 for supplying water to the stirring tank 181, and a disaggregation accelerator supply unit 183. As the disaggregation accelerator for promoting disaggregation of the waste paper 6 supplied from the disaggregation accelerator supply unit 183, sodium hydroxide, sodium carbonate, etc. can be used, and sulfamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, aluminum sulfate can be used. Acids such as sodium chlorite, sodium hypochlorite, sodium chlorite, hydrogen peroxide and other oxidizing agents, surfactants, bleaching agents, PH stabilizers, chelating agents, dispersing agents, and the like can also be used supplementarily.

At the bottom of the agitation tank 181, a stirring blade 184 is provided for stirring and separating the waste paper 6 together with the water supplied from the water supply unit 182, and has a driving means 188 such as a motor for rotating the stirring blade 184. ing. Moreover, the used paper pulp liquid extraction part 187 for taking out the obtained used paper pulp liquid is provided.

(Deinking pulp section)
As shown in FIG. 1, the deinking pulp unit 2 includes a pre-deinking dilution unit 21 and a deinking processing unit 22, and a transfer unit (not shown) including a pipe, a pump, and the like is provided between the units. .

  The pre-deinking diluting section 21 is a fiber concentration suitable for deinking the waste paper pulp liquid sent from the pulper 18, here about 0.1 wt% to 5.0 wt%, more preferably 0.3 wt% to The liquid is diluted to about 2.0% by weight, and is provided with a diluting liquid supply unit (not shown) for supplying diluting water, a surfactant as a deinking agent, and the like. By setting the fiber concentration to 0.1 wt% to 5.0 wt% in the pre-deinking dilution unit 21, the toner component and the deinking agent are efficiently brought into contact with each other in the subsequent deinking processing unit 22. It can be easily removed.

 FIG. 3A shows a plan view of the deinking processing apparatus B constituting the deinking processing unit 22, and FIG. 3B shows a cross-sectional view taken along the line AA in FIG. The deinking treatment apparatus B is for producing a deinked pulp by separating printing components such as an ink component and a toner component dissolved or mixed in a waste paper pulp liquid, and includes a deinking tank 221, a blade 222, An overflow tank 223 is provided.

The deinking tank 221 circulates used paper pulp liquid containing printing components such as an ink component and a toner component that are adjusted to a predetermined concentration by supplying a diluent in the pre-deinking dilution unit 21. The deinking tank 221 is partitioned into a plurality of deinking chambers 225 by a plurality of partition walls 224. As shown in the plan view of FIG. 3A, the left or right side of the partition walls 224 are alternately arranged. All the deinking chambers 225 communicate with each other by opening. As shown in FIG. 3B, a bubble supply unit 226 is provided at the bottom of each deinking chamber 225 for supplying fine bubbles into the waste paper pulp liquid flowing through the deinking tank 221. .

Further, in the deinking tank 221, a stirrer blade (not shown) for stirring the used paper pulp liquid in a predetermined position where the flow rate of the used paper pulp liquid decreases and the used paper pulp liquid easily stagnates and flows downstream. Is arranged. There are various types of stirring blades, and examples include a stirring blade having a structure in which a plurality of blades are arranged radially around the rotation axis. Furthermore, an inflow part 229a for allowing the waste paper pulp liquid to flow into the deinking tank 221 and an outflow part 229b for allowing the deinking pulp liquid containing the deinking pulp generated after the deinking process to flow out of the deinking tank 221 are provided. ing.

Moreover, although the temperature sensor 227 for detecting the temperature of the used paper pulp liquid in each deinking chamber 225 and the heater 228 are provided on the front and back surfaces of the partition wall 224, the temperature management of the used paper pulp liquid is not performed. However, the temperature sensor 227 and the heater 228 may be omitted.

The blade 222 is provided above the deinking tank 221 and reciprocates while being guided by the guide rail 222b by the driving of the motor 222a. Air bubbles floating above the deinking tank 221 are removed from the peripheral wall of the deinking tank 221. For overflowing to the overflow tank 223 side.

As shown in FIG. 3A, the overflow tank 223 is provided so as to surround the outer periphery of the deinking tank 221, and bubbles supplied from the bubble supply unit 226 into the waste paper pulp liquid overflow from the deinking tank 221. This is what catches these bubbles. As shown in FIG. 3 (b), the overflow tank 223 is provided with a liquid supply means 211 for washing and defoaming bubbles and fibers adhering to the inner wall surface of the overflow tank 223. The liquid supply means 211 includes a liquid supply pipe 212 arranged over the entire circumference of the upper and middle stages of the inner wall surface of the overflow tank 223, and the liquid supply pipe 212 has a plurality of liquid supply ports 213. It is formed at a predetermined interval.

The liquid supply pipe 212 is connected to a tap water supply unit (not shown) for supplying tap water and a white water tank 54 (see FIG. 1) for storing white water, which will be described later, and is controlled by the control unit. The liquid is supplied from this.

Furthermore, the overflow tank 223 may be provided with a wind supply unit (not shown) or the like that extinguishes bubbles by blowing hot air or hot air on the generated bubbles and blowing off the moisture of the bubbles, if necessary.

At the bottom of the overflow tank 223, an extraction section 214 for taking out the liquid collected in the overflow tank 223 is provided. The liquid collected in the overflow tank 223 includes at least one of a defoaming liquid and a cleaning liquid supplied from the liquid supply port 213, and water and ink overflowing from the deinking tank 221 with the bubbles generated by the disappearance of the bubbles. It is a drainage liquid in which printing components such as components and toner components and a liquid containing waste paper pulp and the like are mixed. A pipe (not shown) connected to the extraction unit 214 is connected to a drainage tank 53 (see FIG. 1).

(Paper making)
The paper making unit 3 is constituted by a paper making apparatus S including a wire unit 32 shown in FIG. 4 for making a used paper pulp liquid after deinking, a dehydrating unit 33 shown in FIG. 5, and a drying unit 34 shown in FIG. Is done. The wire part 32 is constituted by a wet paper forming apparatus K, and a head box 31 is provided in the wire part 32. The upper part of the head box 31 is opened, and a waste paper pulp liquid supply port 31a is formed in the lower part. ing. At both ends in the width direction of the used paper pulp liquid supply port 31a, guide members 31b having a predetermined length are cantilevered along both side edges of the papermaking wire 323 for making the used paper pulp liquid. The guide member 31b prevents the waste paper pulp liquid supplied from the head box 31 onto the papermaking wire 323 from flowing outward from the side edge of the papermaking wire 323, and makes the papermaking width of the wet paper 64 a predetermined length. Set and maintain.

The papermaking wire 323 is stretched over a plurality of rotating rollers 321 to form an endless track. Further, below the upper papermaking wire 323a, a water receiving portion 325 for receiving water flowing down from the mesh of the papermaking wire 323 is provided. The water receiving unit 325 is connected to a white water tank 54 (see FIG. 1) of the drainage processing unit 5 described later.

As shown in FIG. 5, the dewatering unit 33 includes a dewatering device P, and includes a dewatering belt 10, a press roller 15, a squeezing member 24, a pinching pressure setting releasing unit 27, a squeezing pressure setting releasing unit 29, and a receiving unit. The water part 30 is provided. The dewatering belt 10 includes an upper endless dewatering belt 11 that conveys the wet paper 64 in a wet state transferred from the papermaking wire 323, and a lower dewatering belt 12 that is partially in contact with the dewatering belt 11 and travels. It has. The upper dewatering belt 11 is made of a material having little water permeability, such as a metal or a synthetic resin. On the other hand, the lower dewatering belt 12 is formed of a material having water permeability, and in particular, the dewatering efficiency of the wet paper 64 is formed by a material having not only water permeability but also water absorption such as felt. It is preferable in terms of improvement. The upper dewatering belt 11 and the lower dewatering belt 12 are stretched around a plurality of rotating rollers 35.

The press roller 15 includes a plurality of upper and lower press rollers 16 and 17 arranged in parallel along the conveyance direction of the wet paper 64. Each of the upper press rollers 16 is installed inside the upper dewatering belt 11 and presses the wet paper 64 from above via the upper dewatering belt 11. The upper press roller 16 is formed of a relatively rigid member such as metal or reinforced synthetic resin, and is installed upright on both sides of the upper dewatering belt 11 and the lower dewatering belt 12 in the width direction. It is pivotally supported by the frame 36 of the main body 28 so as to be rotatable.

Each of the lower press rollers 17 is disposed at an opposite position of the upper press roller 16 and inward of the lower dewatering belt 12, and the wet paper web 64 is moved downward through the lower dewatering belt 12. Press more. On the outer peripheral surface of the lower press roller 17, as shown in enlarged views in FIGS. 8 and 9, there is provided a water absorbing portion 37 that absorbs moisture generated by sandwiching the wet paper 64. The water-absorbing part 37 is formed by, for example, forming a synthetic resin such as polyurethane foam having a large number of fine open cells into a cylindrical shape and attaching a cloth such as felt or felt around the rotating shaft 44. And the like.

Moreover, as shown in FIG. 5, the squeezing member 24 presses the lower press roller 17 and squeezes out the water contained in the water absorbing portion 37, and is relatively rigid such as made of metal or reinforced synthetic resin. As shown in FIGS. 8 and 9, the squeezing member 24 in the present embodiment is configured by a squeezing roller 25 that is rotatably installed with the rotary shaft 50 as an axis. The squeezing roller 25 may be replaced with a member made of metal or the like, and water may be squeezed using a roller formed of a perforated plate material such as punching metal in a cylindrical shape.

As shown in FIG. 5, the lower press roller 17 and the squeezing roller 25 are accommodated in the drawer unit 90. The drawer unit 90 is pulled out from the apparatus main body 28 along the axial direction of the press roller 17. FIG. 7 shows an enlarged perspective view of the drawer unit 90. The drawer unit 90 includes a bottom plate 95 and side plates 91, 92, 93, 94 that are erected around the bottom plate 95. The side plates 91 and 92 are disposed along the axial direction of the press roller 17 and the squeezing roller 25, and the side plates 93 and 94 are oriented in a direction perpendicular to the axial direction of the press roller 17 and the squeezing roller 25, and are wet. It is arranged along the conveyance direction C of the paper 64.

The lower end edge of the side plate 91 on the upstream side in the conveyance direction of the wet paper 64 and the upstream end edge of the bottom plate 95 are separated by a predetermined length, an opening 99 is formed, and water accumulated in the drawer unit 90 due to dehydration is removed. The water is discharged from the opening 99 to the lower water receiving portion 30. Further, as shown in FIG. 7, a connector 96 projects from the upstream end of the right side plate 94. When the drawer unit 90 is attached to the apparatus main body 28 as shown in FIG. It is connected to a receiving connector 97 provided on the outer surface. Further, as shown in FIG. 7, an alignment member 98 having a hole 38 formed at the center of the thin plate protrudes from the front and rear edges of the right side plate 94 in the transport direction C. The hole 38 is inserted into an alignment pin 39 provided at a predetermined position on the outer surface of the frame 36 of the apparatus main body 28 shown in FIG. 5, and the drawer unit 90 is aligned and mounted at a predetermined position of the apparatus main body 28.

As shown in FIG. 5, the drawer unit 90 is removably received by a unit receiving portion 106 provided in the apparatus main body 28 of the dehydrating apparatus P. The unit receiving portion 106 includes a support member 107 that slidably contacts and supports the bottom plate 95 of the drawer unit 90, a front wall 108, and a rear wall 109.

The clamping pressure setting release means 27 sets and releases the wet paper web clamping pressure of the pair of press rollers 15, and in this embodiment, the installation height of the lower press roller 17 is raised and lowered to a predetermined position. By doing so, the pressing force on the upper press roller 16 is set and released. Further, the squeezing pressure setting releasing means 29 is for releasing the pressing force of the squeezing member 24 against the press roller 15 provided with the water absorbing portion 37, and lowering the installation height of the squeezing member 24, The pressing force on the press roller 17 is set and released. The clamping pressure setting releasing means 27 and the squeezing pressure setting releasing means 29 are respectively provided outside the left and right side plates 93 and 94 of the drawer unit 90.

FIG. 8 is an enlarged view of the upper and lower press rollers 16 and 17, the squeezing member 25, the clamping pressure setting release means 27, and the squeezing pressure setting release means 29, and FIG. 9 is an exploded perspective view thereof. The clamping pressure setting releasing means 27 includes a clamping sliding contact plate 48 that is in sliding contact with the outer surfaces of the side plates 93 and 94, and a clamping sliding drive unit 49 that slides the clamping sliding contact plate 48 along the side plates 93 and 94. I have. The squeezing pressure setting release means 29 includes a squeezing sliding contact plate 51 that slides at least one of the pressing roller 17 and the squeezing member 24 along the side plates 93 and 94, and the squeezing sliding contact plate 51 on the side plates 93 and 94. And a squeeze sliding drive unit 52 that is slid along. In the present embodiment, the squeezing pressure setting release means 29 slides the squeezing member 24 with respect to the lower press roller 17.

The sandwiching sliding contact plate 48 is in sliding contact with the outer surfaces of the side plates 93 and 94, and the squeezing sliding contact plate 51 is in sliding contact with the outer surface of the sandwiching sliding contact plate 48. Both the slidable contact plate 48 for squeezing and the slidable contact plate 51 for squeezing are both guided by a guide 56 and are individually slidable in the vertical direction. The guide 56 is screwed onto the side plates 93 and 94 by screws 57, and is fixed by fitting a hole 59 to a protrusion 58 provided on the side plates 93 and 94.

A bearing 45 that pivotally supports the rotating shaft 44 of the lower press roller 17 is installed on the upper part of the sandwiching sliding contact plate 48. The rotating shaft 44 of the lower press roller 17 is rotatably supported by the bearing 45 after being inserted into an opening 46 formed in the side plates 93 and 94. A long hole 61 that is long in the vertical direction through which the rotary shaft 50 of the squeezing roller 25 is inserted is formed in the lower portion of the slidable contact plate 48 for clamping. The lower end portion of the sandwiching sliding contact plate 48 is provided with a bent portion 62 that is bent substantially at a right angle and protrudes outward. In the vicinity of both ends of the bent portion 62, a guide rod insertion hole 63 that constitutes a part of the sandwiching sliding drive portion 49 is formed penetrating in the vertical direction, and the guide rod 66 is inserted from below. Yes. Further, an insertion hole 86 constituting a part of the squeeze sliding drive unit 52 is formed in a substantially central portion on the upper surface of the bent portion 62 so as to penetrate downward, so that the squeezing pressure variable screw 68 is inserted from below. It has become.

In addition to the guide rod insertion hole 63, the sandwiching sliding drive unit 49 includes a coil spring 70, a guide rod 66, a base 71, a lifting platform 72, a clamping pressure variable screw 74, and a motor 75. The coil spring 70 has a guide rod 66 inserted therein, and an upper end thereof is in contact with the lower surface of the bent portion 62 via a motor support member 73 described later. The base 71 and the lifting base 72 are disposed below the sandwiching sliding contact plate 48. The base 71 is disposed between the two guide rods 66 and is provided with screw holes 77 formed so as to penetrate outward from the contact surfaces with the side plates 93 and 94. The base 71 is fixed to the side plates 93 and 94 by screwing the fixing holes 78 inserted into the side plates 93 and 94 into the screw holes 77. Further, a screw hole 80 is formed in the central portion of the upper surface of the base 71 so as to penetrate downward. In the screw hole 80, a holding pressure variable screw 74 for raising and lowering the holding sliding contact plate 48 is inserted from below and screwed.

The lifting platform 72 is disposed below the base 71, guide rods 66 are erected in the vicinity of both ends of the upper surface of the lifting platform 72, and a clamping pressure variable screw 74 penetrates downward in the center of the upper surface. An insertion hole 86 for insertion is formed. A thrust bearing 81 is fixed to the lower surface of the lifting platform 72, and a cap portion 83 of a clamping pressure variable screw 74 is fixed to the lower surface of the thrust bearing 81.

The clamping pressure variable screw 74 is constituted by a hexagon socket bolt, and a motor 75 is connected to the lower surface of the cap portion 83. Screws 88 and 89 are inserted into the motor support member 85, and the motor 75 is suspended from the lower surface of the lifting platform 72 by being screwed into the lower portion of the guide rod 66 and the motor 75.

By driving the motor 75, the holding pressure variable screw 74 rotates and the holding pressure variable screw 74 advances in the screw hole 80 of the base 71, so that the base 71 fixed to the side plates 93 and 94 is moved. The lifting platform 72 is close to. When the guide bar 66 is moved up and down as the elevator 72 is raised and the bent portion 62 is pushed up by the urging of the two coil springs 70, the holding slide contact plate 48 is raised, and the lower press roller 17 and The clamping pressure with the upper press roller 16 is set to a predetermined pressure required for dewatering the wet paper 64. On the other hand, when the lifting platform 72 is separated from the base 71, the force for pushing up the bent portion 62 caused by the urging of the two coil springs 70 is weakened, and the slidable contact plate 48 for lowering is lowered to lower the press roller. By separating 17 from the upper press roller 16, the clamping pressure of the wet paper 64 is released.

The squeezing sliding plate 51 is provided with a bearing 55 that supports the rotary shaft 50 of the squeezing roller 25. Then, the rotary shaft 50 of the squeezing roller 25 is inserted into the opening 46 of the side plates 93 and 94 and the long hole 61 of the slidable contact plate 48 for clamping, and then is rotated by a bearing 55 provided on the squeeze slidable contact plate 51. It is supported. A screw hole 79 is formed in a lower portion of the squeezing sliding plate 51 so as to protrude downward, and a squeezing pressure variable screw 68 is inserted and screwed from below.

The squeeze sliding drive unit 52 includes a squeeze pressure variable screw 68 and a motor 69 in addition to the screw hole 79. The squeezing pressure variable screw 68 has an upper end abutted against the lower surface of the squeezing sliding contact plate 51 and a lower end connected to the motor 69. The motor 69 is suspended from the lower surface of the bent portion 62 by screwing the screw 90 onto the upper surface of the motor 69 via the motor support member 73. By driving the motor 69, the squeezing pressure variable screw 68, which is inserted through the insertion hole 86 of the bent portion 62 and is screwed into the screw hole 79 of the squeezing sliding contact plate 51, is lifted, so that the lower press The distance between the shaft centers of the roller 17 and the squeezing roller 25 is shortened, and the pressing force of the squeezing roller 25 against the lower press roller 17 is set to a predetermined pressure. On the contrary, the squeeze sliding contact plate 51 is lowered by the rotation in the screw hole 79 of the squeezing pressure variable screw 68, and the squeezing roller 25 is separated from the lower press roller 17, whereby the squeezing roller for the lower press roller 17. The pressing force of 25 is released.

In FIG. 10, the nipping pressure setting releasing means 27 and the squeezing pressure setting releasing means 29 are operated to hold the wet paper web holding pressure of the lower press roller 17 with respect to the upper press roller 16 and the squeezing roller 25 with respect to the lower press roller 17. The state where all the pressing forces are released is shown. As shown in the figure, the sandwiching sliding drive unit 49 is driven, and the sandwiching sliding contact plate 48, the guide rod 66, the lifting platform 72 and the motor 75 are driven against the side plates 93 and 94, the guide member 56 and the base 71. The lower press roller 17 is separated from the upper press roller 16 to release the clamping pressure. Then, the squeeze slidable contact plate 51 is driven, the squeeze slidable contact plate 51 is lowered with respect to the sandwiching slidable contact plate 48, and the pressing force of the squeezing roller 25 against the lower press roller 17 is released.

FIG. 11 shows an overview of the drive unit 110 of the upper and lower press rollers 16, 17 and the squeezing roller 25. The drive unit 110 is provided on the left side surface of the dewatering device P, and each rotary shaft 44 of the lower press roller 17 extends outward from the left side plate 93 and is connected to each other by a plurality of pulleys 111 and belts 112. Further, the rotating shaft 44a of the press roller 17a installed on the most downstream side in the conveyance direction C of the wet paper 64 is connected to the motor 113 by the pulley 111a and the belt 112a and is rotated. The upper press roller 16 and the squeezing roller 25 are driven by the rotation of the lower press roller 17.

When pulling out the press unit 90 from the apparatus main body 28, the belt 112a connecting the motor 113 and the rotating shaft 44a of the press roller 17a installed on the most downstream side is removed, and the drawer unit 90 is slid with respect to the support member 107 of the apparatus. Move.

As shown in FIG. 5, a water receiving portion 30 is provided below the squeezing roller 25, and the water generated when the wet paper 64 is pinched by the press roller 15 and squeezed out from the water absorbing portion 37 by the squeezing member 24. It is designed to catch the moisture that has been released. The water receiver 30 is connected to a white water tank 54 shown in FIG.

As shown in FIG. 6, the drying unit 34 is configured by a wet paper web drying device R. As shown in FIG. 6, a plurality of rotating rollers 351 and drying rollers 343 are arranged in a hood 341, and the plurality of rotations are arranged. A pair of upper and lower conveying belts 342 are provided between the roller 351 and the drying roller 343. The material of the conveyor belt 342 is not particularly limited. For example, the conveyor belt 342 is made of cloth, heat-resistant resin, metal, or the like, and the upper and lower conveyor belts 342 run with a part in contact with each other. The drying roller 343 is arranged. The drying roller 343 includes a heater 345 inside, a winding belt 342 is wound around the outer peripheral surface, and a temperature sensor (not shown) that measures the temperature of the surface of the drying roller 343.

(Finishing part)
As shown in FIG. 1, the finishing unit 4 includes a calendar unit 41 and a cut unit 42, and the calendar unit 41 includes a plurality of press rollers (not shown) for increasing the flatness of the paper, and the cut unit 42 includes a cutting blade (not shown) for cutting the paper into a predetermined sheet size.

(Drainage processing part)
As shown in FIG. 1, the drainage processing unit 5 has drainage tanks 53 and white water tanks 54, and the drainage in the drainage tank 53, which is highly contaminated and difficult to be reused, is necessary. After detoxification by performing predetermined waste liquid processing, the waste paper recycling processing apparatus 100 is configured to discharge the waste paper. The waste water in the white water tank 54, which is low in contamination level and can be reused, is removed through a filter, if necessary, after removing ink, toner, etc., neutralized by adding chemicals, etc. The ink is supplied to the pre-ink dilution unit 21 and can be used again.

(Operation of the first embodiment)
The operation of the used paper recycling apparatus 100 according to this embodiment will be described below.
First, as shown in FIG. 2, the waste paper 6 is put into the pulper 18. In the pulper 18, a predetermined amount of water is supplied from the water supply unit 182 in advance according to the amount of used paper 6 to be input, the driving means 188 is operated to rotate the stirring blade 184, and the water in the stirring tank 181 is stirred. Keep it. In this state, the used paper 6 is put into the stirring tank 181 as described above. And a disaggregation promoter is thrown into the stirring tank 181 from the disaggregation promoter supply part 183.

The used paper 6 is stirred in the stirring tank 181 by the rotation of the stirring blade 184 to form a used paper pulp liquid. The used paper pulp liquid containing the used paper pulp obtained in the pulper 18 is taken out from the used paper pulp liquid take-out section 187 and then sent to the deinking pulp section 2 as shown in FIG.

In the deinking pulp unit 2, first, the waste paper pulp solution is supplied with dilution water and a surfactant as a deinking agent from the diluting solution supply unit so that the fiber concentration is suitable for deinking in the pre-deinking diluting unit 21. Dilute waste paper pulp liquor. Next, the used paper pulp liquid adjusted to a predetermined used paper pulp concentration is sent to the deinking processing unit 22.

In the deinking processing unit 22, the used paper pulp liquid flowing from the inflow portion 229 a into the used paper pulp liquid circulation tank 221 shown in FIG. 3 is sequentially distributed from the left or right opening of the partition wall 224 to the adjacent deinking chamber 225. Let In each deinking chamber 225, fine bubbles are blown from the bubble supply unit 226 into the waste paper pulp liquid in the presence of the deinking agent, and toner particles are formed on the surface of the bubbles generated in large quantities without disappearing due to the presence of the deinking agent. Hydrophobic foreign matters such as the like are attached and floated on the top of each deinking chamber 225. Further, if necessary, a stirring blade is operated so as to promote smooth circulation of the used paper pulp liquid in the used paper pulp distribution tank 221.

The hydrophilic waste paper pulp sequentially flows through the deinking chamber 225 together with water. In this way, deinking is performed to remove toner components and the like from the waste paper pulp liquid. At that time, if necessary, the temperature sensor 227 may detect the temperature of the used paper pulp liquid, and the heater 228 may control the temperature so that the used paper pulp liquid is maintained at a predetermined temperature. It is not always necessary to perform the temperature control.

After introducing the waste paper pulp liquid into the deinking processing unit 22, when a predetermined time has passed and the deinking process proceeds and air bubbles float above the deinking chambers 225, the motor 222 a is driven and the guide rail 222 b The blade 222 is reciprocated in the vertical direction in FIG. 3A while guiding the air to the bubble discharge tank 223 to sweep out bubbles floating above the used paper pulp liquid circulation tank 221. The bubbles swept out to the bubble discharge tank 223 are washed away by the cleaning liquid ejected from the cleaning liquid ejecting portion 223a, and the liquid containing the cleaning liquid, the deinking agent, the toner component and the like accumulated in the bubble discharge tank 223 is discharged to the drainage tank 53. Sent.

The used paper pulp liquid is distributed to all the deinking chambers 225 in the used paper pulp liquid distribution tank 221, and the used paper pulp liquid is deinked to obtain deinked pulp. The ink pulp liquid) is caused to flow out from the outflow portion 229b and sent to the papermaking portion 3.

In the paper making section 3, as shown in FIG. 4, the waste paper pulp-containing liquid after deinking is uniformly supplied to the guide member 31b on the paper making wire 323 running from the head box 31, and drained to remove moisture. The wet paper 64 which is a fiber layer containing a relatively large amount is formed. The water that flows down below the papermaking wire 323 is received by the water receiving unit 325 and sent from the water receiving unit 325 to the white water tank 54.

When the wet paper 64 on the papermaking wire 323 reaches the end of the forward path, it is transferred to the dewatering belt 11 on the upper side of the dewatering unit 33 as shown in FIG. Thereafter, the wet paper 64 is sandwiched between the lower dewatering belt 11, and the moisture contained in the wet paper 64 is guided downward by passing the lower dewatering belt 12 having water permeability. At the installation location, the wet paper web 64 is depressurized by the upper and lower press rollers 15 via the dewatering belts 11 and 12 and dehydrated. The upper and lower press rollers 15 are set to a predetermined pressure by the clamping pressure setting release means 27, and the pressing force of the squeezing member 24 against the lower press roller 17 is set to a predetermined pressure by the squeezing pressure setting release means 29. ing.

Moisture generated by pressing the wet paper 64 by the press roller 15 and water generated by pressing the water absorbing portion 37 by the squeezing member 24 accumulate in the lower part of the drawer unit 90 and flow downward from the opening 99. After being received by the water receiving part 30, it is sent to the white water tank 54 and stored.

The dehydrated wet paper 64 is conveyed to the drying unit 34 and is brought into contact with the sandwiching belt 342 in the hood 49 as shown in FIG. 6, and between the sandwiching belt 342 and the drying belt 56. It is nipped and transported. Then, the wet paper web 64 is dried by being conveyed while being brought into contact with the plurality of drying rollers 343 heated by the heater 345 and maintained at a predetermined temperature via the drying belt 56 and the sandwiching belt 342. A recycled paper 65 before finishing is obtained.

The recycled paper 65 before finishing exiting the drying unit 34 is sent to the calendar unit 41 shown in FIG. 1 and passed between a plurality of press rollers to improve the flatness of the recycled paper before finishing. The recycled paper 7 is completed by cutting into a predetermined size at 42.

The broken material of the recycled paper 65 before finishing, which is no longer necessary as a result of being cut at the cutting section 42, is returned to the pulper 18 as shown in FIG. 1, and is used again for the production of recycled paper.

Of the wastewater sent to the wastewater treatment unit 5 in each process, wastewater in the wastewater tank 53, which is highly contaminated and difficult to reuse, is subjected to a predetermined waste liquid treatment if necessary and then used by the used paper recycling processing apparatus 100. Discharge to the outside. The waste water in the white water tank 54 having a low degree of contamination and reusable is subjected to treatments such as removing ink components, toner components, etc. through a filter, adding chemicals, and neutralizing as necessary. It is supplied to the pre-deinking dilution unit 21 and used again.

When the water absorption force of the water absorbing portion 37 of the press roller 17 decreases due to the use of the used paper recycling apparatus 100, the press unit 90 is pulled out from the receiving portion 106 of the apparatus main body 28, and the press roller 17 is moved to another new press roller. Replace with 17. In this way, the press roller 17 with reduced water absorption can be replaced very easily by pulling out the press unit 90. Temporarily, it is possible to suppress a decrease in dewatering efficiency, an increase in load on the drying unit 34, and a deterioration in the quality of the obtained recycled paper 7 that occur when the use of the press roller 17 having a reduced water absorption force is continued.

  As described above, the used paper recycling apparatus 100 according to the present invention includes the clamping pressure setting release means 27 and the lower press roller 17 provided with the water absorption portion 37 is accommodated in the drawer unit 90. Since the dewatering device P provided detachably with respect to the apparatus main body 28 is provided, when the operation of the used paper recycling apparatus 100 is stopped, the holding pressure of the wet paper 64 by the press roller 15 is released, and the drawer unit 90 is installed. By removing from the main body 28, the press roller 17 can be easily replaced, the dewatering efficiency of the dewatering device P can be recovered, and the quality of the recycled paper obtained can be improved.

In each of the above embodiments, the upper dewatering belt 11 is made of a material having little water permeability. However, in the wet paper dewatering apparatus according to the present invention, the upper dewatering belt 11 is replaced with the lower dewatering device. A material having the same water permeability as the dewatering belt 12 may be used. In this case, the upper press roller 16 installed on the inner side of the upper dewatering belt 11 may be provided with a water absorption part that absorbs moisture generated by the clamping pressure of the wet paper. You may provide the squeezing member which squeezes the water | moisture content of a water absorption part. Thereby, the dewatering efficiency of the wet paper can be improved. The squeezing member is pressed against the press roller on the upstream side of the rotary shaft of the upper press roller in the conveyance direction of the wet paper, and the water squeezed from the water absorbing portion by the squeezing member is pressed between the press roller and the squeezing member. After being accumulated above the part and guided to the side, it flows down from the outside of the dewatering belt 11 to the water receiving unit 30.

In addition, the squeezing member 24 is configured to be a pressure roller 15 that is pressed against the press roller 15 and rotates. ).

In the first embodiment, the used paper recycling apparatus 100 provided with the deinking pulp unit 2 is shown. However, the present invention is not limited to this, and the deinking pulp unit 2 may not be provided. Thus, when the deinking pulp part 2 is not provided, the used paper pulp liquid manufactured in the used paper pulp liquid manufacturing part is sent to the paper making part to perform paper making. When the used paper recycling apparatus is a recycled paper manufacturing apparatus using waste paper as a raw material, the used paper pulp liquid supplied to the head box and made by the paper making wire is in a state containing a printing component.

Further, the press roller is formed by a combination of a rigid press roller and a press roller having a water absorption part, but both of the press rollers having rigidity have a downstream side of the press roller pair including the press roller having the water absorption part. You may install in. Thus, on the wet paper transport path, the wet paper is efficiently dehydrated while absorbing water with a press roller having a water absorbing portion at a position where the moisture content of the wet paper is high, and at a position where the moisture content is low, it is higher with a rigid press roller. Dehydration due to the clamping pressure can drastically improve the dewatering rate of the wet paper.

P Dewatering device S Papermaking device W Waste paper pulp liquid production device 32 Wet paper forming device 334, 334e Press roller pair 44 First press roller 45 Second press rollers 47, 47a, 47e Water absorbing belts 10, 11, 12 Dewatering belt

Claims (5)

A pair of endless dewatering belts that sandwich and convey wet paper in a wet state;
A pair of press rollers that are respectively installed inside the pair of dewatering belts and narrow the pressure of the wet paper sandwiched between the pair of dewatering belts through the dewatering belt;
At least one of the dewatering belts is formed of a material having water permeability,
Wet paper dewatering, in which a water absorbing part that absorbs moisture generated by clamping the wet paper is provided on the outer peripheral surface of the press roller installed inside the dewatering belt formed of the material having water permeability. A device,
A pair of press rollers is set to hold the wet paper at a predetermined pressure at the time of dehydration operation of the wet paper, and includes a holding pressure setting release means for releasing the holding pressure when the operation is stopped.
The press roller provided with the water absorbing portion is accommodated in a drawer unit provided inside the dewatering belt having water permeability,
The drawer unit is a wet paper web dehydrator provided so as to be detachable from the apparatus body when the clamping pressure is released. 2. The wet paper web dewatering apparatus according to claim 1, wherein the drawer unit is pulled out along the axial direction of the press roller with respect to the apparatus main body. 3. The wet paper web according to claim 1, wherein the nipping pressure setting releasing means is provided on a side plate of the drawer unit that is disposed in the width direction side of the dewatering belt and along the conveyance direction of the wet paper web. Dehydration equipment. The clamping pressure setting release means pivotally supports the rotary shaft of a press roller having a water absorption part, and a sliding contact plate for clamping that slides on the side plate of the drawer unit while being guided by the guide,
The wet paper web dewatering device according to any one of claims 1 to 3, further comprising a clamping slide drive unit that slides the clamping sliding contact plate along the side plate. Waste paper pulp liquid production equipment that stirs waste paper with water supplied from the water supply unit to produce waste paper pulp liquid;
Wet paper pulp liquid produced by the waste paper pulp liquid production apparatus, paper making using a paper making wire, wet paper forming apparatus for forming wet paper,
5. A used paper recycling apparatus that integrally includes the wet paper web dewatering device according to claim 1 or 4 for dewatering the wet paper web formed by the wet paper web forming apparatus.

Images