JP5724078B2 - Waste paper recycling processor - Google Patents

Description

  The present invention relates to a used paper recycling apparatus.

2. Description of the Related Art Conventionally, in Japan, a technology and a social system have been established for recovering used paper, such as used newspaper and office paper, and recycling the used paper.
However, when recycled paper is made from used paper, the consumption of paper in residential areas, offices, etc., where old newspaper is collected as recycled products, and the papermaking factory that recycles paper from used paper are separated. Cost and energy are required to collect and transport waste paper. Also, in the office, there is a risk that confidential information and the like written on the paper will be leaked to the outside by taking out the used paper.

 Therefore, in Patent Document 1 below, a recycled pulp section for separating recycled paper to prepare a recycled pulp, a deinked pulp section for bleaching the recycled pulp to prepare a deinked pulp, and paper making the deinked pulp Thus, there is described a used paper recycling processing apparatus that is integrally provided with a papermaking section for preparing recycled paper.

JP 2009-299228 A

In the above-mentioned Patent Document 1, when recycled pulp prepared from recycled paper raw material is transferred to each part of the subsequent stage in the recycled pulp section, the recycled pulp may remain in the middle of the transfer path. All of them could not be used effectively for the production of recycled paper.

The present invention solves the above-described problems, and an object of the present invention is to provide a used paper recycling apparatus in which recycled pulp prepared from used paper raw materials is prevented from remaining in the transfer path.

In order to achieve the above object, a used paper recycling apparatus according to the present invention has a pulper for producing recycled pulp by breaking up used paper raw materials, and a recycled pulp section that supplies recycled pulp to a papermaking section at a later stage, In a used paper recycling apparatus comprising a papermaking unit for papermaking a recycled pulp supplied from a recycled pulp unit and preparing a recycled paper, in the middle of a transfer path for transferring the recycled pulp from the pulper to the papermaking unit, upstream of the transfer path A storage tank for storing the recycled pulp flowing in from the side and supplying the recycled pulp to the downstream side of the transfer path is provided, and the storage tank has a stirring blade for stirring the recycled pulp stored therein, and driving of the stirring blade Means and an outlet for flowing out the recycled pulp formed on the bottom surface of the storage tank to the downstream side. Pulp, said scraper unit scrape to the outlet provided, the scraper unit, either formed integrally with the stirring blade, or scraper unit scraper member constituting being fixed to said stirring blade Is.

Further, the scraping portion has a hollow portion recessed backward with respect to the rotation direction of the stirring blade, and the hollow portion passes above the outlet when the stirring blade rotates. Is.

According to the used paper recycling apparatus of the present invention, when the recycled pulp stays in the lower part of the storage tank provided in the middle of the transfer path for transferring the recycled pulp from the pulper to the papermaking unit, is it formed integrally with the stirring blade? or raked portion Ki out the scraper member constituting that scrape the recycled pulp to the residence by scraper portion which is fixed to the stirring blade to the bottom surface which is formed in the outlet of the storage tank, waste paper raw material It is possible to suppress the regenerated pulp prepared from the remaining in the transfer route.

Further, when the scraping portion has a hollow portion recessed backward with respect to the rotation direction of the stirring blade, and the hollow portion passes above the outlet when the stirring blade rotates, a storage tank The reclaimed pulp staying on the bottom surface of the water can be scraped by the scraping portion and collected in the hollow portion, and can be sent from the outlet to each subsequent portion, so that the recycled pulp can be scraped efficiently.

1 is a schematic configuration diagram of a used paper recycling processing apparatus according to an embodiment of the present invention. It is the structure schematic of the recycled pulp manufacturing part of the said used paper reproduction | regeneration processing apparatus. It is the structure schematic of the storage part of the said used paper reproduction | regeneration processing apparatus. It is a top view of the storage tank of the said storage part. It is an expansion perspective view of the principal part of the storage tank. It is a schematic perspective view of the papermaking part and the finishing calendar part of the used paper recycling apparatus. It is a top view of the storage tank of the used paper recycling processing apparatus concerning other embodiments. It is an expansion perspective view of the principal part of the storage tank. It is a top view of the storage tank of the used paper recycling processing apparatus concerning other embodiment. It is an expansion perspective view of the principal part of the storage tank.

(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 includes a recycled pulp unit 1, a storage unit 8, a dilution processing unit 9, a deinking unit 2, a paper making unit 3, a finishing unit 4, a drainage processing unit 5, and a control unit 10. It is prepared for. The recycled pulp unit 1 separates the waste paper raw material 6 to produce recycled pulp, the storage unit 8 temporarily stores the recycled pulp from the recycled pulp unit 1, and the dilution processing unit 9 includes the storage unit 8. The deinking unit 2 deinks the recycled pulp from the dilution processing unit 9, and the paper making unit 3 makes the recycled pulp from the deinking unit 2 and recycles the recycled pulp. 7 is prepared, the finishing unit 4 performs finishing by cutting the recycled paper 7 from the paper making unit 3, and the drainage processing unit 5 is configured to remove the waste liquid generated by the used paper recycling process. It is something to process. The control unit controls the operation of each unit.

(Recycled pulp part)
FIG. 2 is a schematic configuration diagram of the recycled pulp unit 1. As shown in FIG. 2, the recycled pulp unit 1 includes a used paper raw material supply unit 14, a measurement unit 17, and a pulper 18.

As the used paper material 6, shredder paper obtained by shredding standard paper such as A4, B5, etc. with a cutting device such as a shredder is used, but it is also possible to use standard paper instead.

The used paper raw material supply unit 14 includes a shredder tank 12. The shredder tank 12 stores the waste paper raw material 6. A discharge port 13 for used paper raw material 6 is formed at the bottom of the shredder tank 12. The discharge port 13 is configured to be freely opened and closed by swinging as shown by a two-dot chain line in FIG.

The measuring unit 17 includes a tray 16 and a measuring instrument 15 such as a load cell. The tray 16 is configured to be tiltable from a horizontal posture to a tilted posture that tilts toward the pulper 18.

The pulper 18 includes a stirring tank 23, a water supply unit 24, and a stirring unit 25. The pulper 18 stirs the waste paper raw material 6 in water and disaggregates it into fibers, that is, recycled pulp. The water supply unit 24 is connected to a tap water supply unit (not shown) such as tap water and a white water tank 52 (see FIG. 1) of the drainage processing unit 5 described later. Among the white water stored, any water is supplied to the stirring tank 23.

A regenerated pulp take-out port 28 is formed in the bottom surface of the stirring tank 23, and a pipe 78 is connected to the take-out port 28. An open / close valve 79 and a pump 77 are disposed in the middle of the pipe 78. As the pump 77, a snake pump, a Mono pump, a tube pump, or the like can be used. When the pump 77 is a tube pump, it is possible to prevent the flow of the liquid containing the regenerated pulp in the pipe 78 by stopping the operation of the tube pump. Absent.

(Reservoir)
3 is a schematic configuration diagram of the storage unit 8, FIG. 4 is a plan view of the storage tank 85 of the storage unit 8, and FIG. 5 is an enlarged perspective view of the lower part of the storage tank. The storage unit 8 includes a storage tank 85. The storage tank 85 is provided in the middle of the transfer path for transferring the recycled pulp from the pulper 18 to the deinking section 2 on the downstream side, stores the recycled pulp flowing in from the upstream side of the transfer path, and downstream of the transfer path. It supplies to the side.

As shown in FIGS. 3, 4, and 5, the storage tank 85 includes stirring means 80, an inlet 86, and an outlet 87. The stirring unit 80 includes a stirring blade 81 that stirs the regenerated pulp stored therein, and a driving unit 82 for the stirring blade 81. As the stirring blade 81, a type that can generate a radiant flow in an anchor type, a pincushion type, a gate type or the like and can efficiently stir a liquid containing high-viscosity recycled pulp at a low speed is preferably used. FIG. 3 shows an example of the stirring blade 81 in which a rectangular opening 83 is formed in a thin plate member having a width slightly smaller than the inner diameter of the storage tank 85.

Both the inflow port 86 and the outflow port 87 are formed to open to the bottom surface 85 a of the storage tank 85. The inlet 86 allows recycled pulp to flow into the storage tank 85 from the upstream side, and a pipe 78 is connected to the inlet 86. On the other hand, the outflow port 87 allows the recycled pulp stored in the storage tank 85 to flow downstream, and a pipe 89 is connected to the outflow port 87.

Further, a scraping portion 90 is provided below the stirring blade 81. The scraping unit 90 scrapes the recycled pulp staying in the lower part of the storage tank 85 to the outlet 87. The scraping portion 90 includes a pair of scraping members 95 made of a rectangular thin plate. The scraping member 95 is preferably made of a flexible and elastic material such as synthetic rubber such as styrene butadiene rubber or silicon rubber, or natural rubber.

The scraping member 95 is sandwiched and supported by a pair of rigid support members 54 and 68. 4 and 5, the support member 54 positioned in front of the scraping member 95 is attached only to the upper portion of the scraping member 95 with respect to the rotation direction U of the stirring blade 81, and is positioned behind the scraping member 95. The supporting member 68 is attached from the upper end of the scraping member 95 to a length position that is about three-quarters of the vertical length of the scraping member 95. The upper portion of the scraping member 95 sandwiched between the front and rear support members 54 and 68 is screwed to the lower portion of the stirring blade 81 with a screw 96.

The lower end portion of the scraping member 95 is brought into sliding contact with the bottom surface 85 a of the storage tank 85 as the stirring blade 81 rotates, and the recycled pulp staying at the lower portion of the storage tank 85 is scraped and guided to the outlet 87.

As shown in FIG. 3, the pipe 89 is provided with an on-off valve 92 and a pump 91 at an intermediate position. The pump 91 sends the liquid containing the recycled pulp taken out from the outlet 87 of the storage tank 85 to the deinking section 2 or the paper making section 3 on the downstream side.

As the pump 91, a snake pump, a mono pump, a tube pump, or the like can be used, similarly to the pump 77 provided in the pipe 78 connecting the stirring tank 23 and the storage tank 85. When the pump 91 is a tube pump, it is possible to prevent the flow of liquid containing recycled pulp in the pipe 89 by stopping the operation of the tube pump. Absent.

The dilution processing unit 9 is provided in the middle of the pipe 89 and downstream of the installation location of the pump 91, and has a structure in which one end of the pipe 93 is connected to the pipe 89. Inside the pipe 93, the diluent from the diluent supply unit 98 circulates, and this diluent is caused to flow into a liquid containing recycled pulp that circulates through the pipe 89. Thereby, the density | concentration of the regenerated pulp in the liquid containing a regenerated pulp is diluted with a diluent.

The diluent supply unit 98 supplies clean water or white water as a diluent. The other end of the pipe 93 is connected to both a supply unit (not shown) of clean water and the white water tank 52. Here, the tap water is tap water or the like, and the white water is water obtained by papermaking stored in a white water tank 52 described later.

(Deinking part)
The deinking section 2 shown in FIG. 1 is for preparing a regenerated pulp after deinking by separating printing color components such as an ink component and a toner component from a liquid containing the regenerated pulp. The deinking unit 2 is configured by a known deinking device. The deinking process by the deinking unit 2 can be omitted. When the deinking process is omitted, as shown in FIG. Sent to 3.

(Paper making)
FIG. 6 is a schematic perspective view of the papermaking section 3 and the calendar section 41 of the finishing section 4. The paper making unit 3 is configured to make a recycled pulp sent from the dilution processing unit 9 when the deinking by the deinking unit 2 is completed or when the deinking process is omitted. The As shown in FIG. 6, the paper making unit 3 includes a head box 31, a wire unit 32, a dehydrating unit 33, and a dryer unit 34.

The head box 31 is for uniformly supplying a liquid containing recycled pulp to the wire portion 32 to form the wet paper 64. The wire part 32 is
The mesh belt 36 is stretched over a plurality of rotating rollers 35, and a water receiving portion 37 for receiving water flowing down from the mesh of the mesh belt 36 is provided inside the mesh belt 36. The water receiving unit 37 is connected to a white water tank 52 (see FIG. 1) of the drainage processing unit 5 described later.

The dewatering unit 33 has a pair of upper and lower endless water-absorbing belts 39 made of felt, which are respectively stretched between a plurality of rollers 38, and the upper water-absorbing belt 39 and the lower water-absorbing belt 39 are partially in contact with each other. The part is provided with a plurality of a pair of squeezing rollers 44 that squeeze and press both water-absorbing belts 39.

The dryer unit 34 includes a plurality of rotating rollers 45 and a plurality of drying rollers 46, and includes a pair of upper and lower drying belts 47 spanned between the plurality of rotating rollers 45 and the plurality of drying rollers 46. Each of the plurality of drying rollers 46 includes a heater 49 therein. Further, a temperature sensor (not shown) for measuring the temperature of the surface of the drying roller 46 is provided.

(Finishing part)
The finishing unit 4 includes a calendar unit 41 and a cutting unit 42 (see FIG. 1). The calendar unit 41 includes a plurality of press rollers 43 for increasing the flatness of the recycled paper 65 before finishing, and includes a cutting 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 treatment unit 5 includes tank bodies of a deinking drainage tank 51 and a white water tank 52, and the drainage in the deinking drainage tank 51 is highly contaminated and difficult to reuse. If necessary, the waste paper is detoxified by performing a predetermined waste liquid treatment, and then discharged to the outside of the used paper recycling apparatus 100. The white water in the white water tank 52, which is low in the degree of contamination and can be reused, is subjected to treatment such as removing ink, toner, etc. through a filter, neutralizing by adding a chemical if necessary, and then once again with the pulper 18 and dilution. It is configured such that it can be supplied to the processing unit 86 and the like and used again.

(Function)
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 raw material 6 in the shredder tank 12 is discharged from the discharge port 13 to the receiving tray 16 by the control of the control unit 10. Next, the amount of used paper raw material 6 required by the measuring unit 17 is measured and put into the stirring tank 23. In the agitation tank 23, a necessary amount of water is supplied from the water supply unit 24, and the used paper raw material 6 and water are stirred by the stirring means 25, and the used paper raw material 6 is disaggregated.

When the disaggregation process is completed and the regenerated pulp is manufactured, the water supply unit 24 supplies water again, and the liquid containing the regenerated pulp is diluted. Thereafter, the on-off valve 79 is opened and the pump 77 is driven. Thereby, the liquid containing the regenerated pulp after dilution is taken out from the take-out port 28, circulated through the pipe 78, and sent to the storage unit 8.

In the storage unit 8 shown in FIG. 3, the liquid containing recycled pulp that has flowed into the inlet 86 from the pipe 78 is temporarily stored in the storage tank 85. Thus, the liquid containing the regenerated pulp is taken out from the agitation tank 23 and temporarily stored in the storage unit 8, whereby new waste paper raw material 6 and water are supplied to the agitation tank 23 that is emptied. The batch-type disaggregation process can be started. The waste paper raw material 6 supplied from the waste paper raw material supply unit 14 for performing the second disaggregation process is obtained by the first disaggregation process stored in the storage unit 8 in parallel while the disaggregation process is being performed. The regenerated pulp can be continuously supplied to the subsequent deinking section 2 and papermaking section 3 to perform deinking and papermaking.

At that time, the controller 10 regenerates the regenerated pulp part 1 obtained by the second disaggregation process before the liquid containing the regenerated pulp obtained by the first disaggregation process stored in the storage tank 85 disappears. The pulp is controlled to flow into the storage tank 85. As a result, since the regenerated pulp can be continuously stored in the storage tank 85 without interruption, the regenerated pulp can be continuously supplied to the subsequent deinking section 2 and the paper making section 3. Therefore, while the recycled pulp unit 1 is a batch type process, even if each subsequent process is a continuous process, it is possible to continue the subsequent process without interruption.

When storing the liquid containing regenerated pulp in the storage tank 85, the control unit 10 drives the driving means 82 to control the stirring blade 81 to rotate. Thereby, the liquid containing the regenerated pulp in the storage tank 85 can be stirred, and the regenerated pulp which tends to settle can fully be disperse | distributed in the liquid containing a regenerated pulp. Therefore, the liquid containing the regenerated pulp is transferred to the deinking unit 2 and the paper making unit 3 and is continuously processed, so that the concentration of the regenerated pulp in the liquid containing the regenerated pulp does not change and is approximately the same. Concentration.

The rotation speed of the stirring blade 81 is preferably relatively low. This is because it is sufficient for the storage unit 8 to be able to disperse the regenerated pulp in the liquid containing the regenerated pulp, and unlike the regenerated pulp unit 1, it is not intended to disaggregate the waste paper raw material 6. Thus, by making the stirring blade 81 rotate at a low speed, the power consumption can be reduced and the cost can be suppressed.

In addition, when the type of the stirring blade 81 is of a type that generates an axial flow in the storage tank 85 such as a propeller, when the amount of liquid containing regenerated pulp stored in the storage tank 85 is large, Regenerated pulp tends to settle. On the contrary, when the liquid containing the regenerated pulp stored in the storage tank 85 is small, the regenerated pulp and water are likely to be scattered, and a large noise is likely to be generated during stirring.

Therefore, these types of problems can be solved by using a stirring blade 81 that generates a radiant flow. When the type that generates a radiant flow is used for the stirring blade 81, the control unit 10 sufficiently disperses the recycled pulp by rotating the stirring blade 81 at a substantially constant and relatively low rotational speed. Therefore, the control of the stirring blade 81 can be simplified.

Moreover, the control part 10 can also make the operation | movement of the stirring blade 81 into the intermittent operation which repeats rotation and a stop. That is, for example, it is possible to perform intermittent operation that repeats rotation for 2 to 6 seconds and stop for 1 to 3 seconds, and so-called intermittent rotation of the regenerated pulp is prevented by performing such intermittent operation. be able to. Furthermore, in addition to this intermittent operation, the rotating direction of the stirring blade 81 can be a reversal operation that repeats forward rotation and reverse rotation. That is, a reversing operation that repeats forward rotation for 2 to 6 seconds, stop for 0 to 3 seconds, and reverse rotation for 2 to 6 seconds is possible. By performing the reversal operation, it is possible to prevent the accompanying blades more reliably than in the intermittent operation in which the stirring blade 81 rotates in the same direction.

Preparation of the regenerated pulp in the regenerated pulp unit 1 is completed, and all the liquid containing the regenerated pulp that is sent from the stirring tank 23 and stored in the storage tank 85 is taken out from the outlet 87 to the pipe 89 to be removed at the subsequent stage. When the ink is transferred to the ink section 2, the regenerated pulp tends to stay in the lower part of the storage tank 85 as the liquid level decreases, and finally only the liquid component flows out from the outlet 87, and only the regenerated pulp is stored in the storage tank. It will remain at the bottom of 85. Therefore, the recycled pulp that stays in the lower portion of the storage tank 85 is scraped to the outlet 87 by the scraper 90.

Thereby, the regenerated pulp which stays in the lower part of the storage tank 85 and remains in the storage tank 85 can be taken out from the outlet 87 to the pipe 89, and the taken out regenerated pulp passes through the deinking unit 2 to the paper making unit 3. The recycled paper 7 can be used for manufacturing. Further, by scraping the recycled pulp by the scraping unit 90, it is possible to suppress the fluctuation of the concentration of the recycled pulp in the liquid containing the recycled pulp taken out from the storage tank 85, and to maintain the quality of the obtained recycled paper, The thickness of the recycled paper 7 manufactured at the final stage of the production of the recycled paper 7 does not decrease. And, when the recycled pulp remaining inside the apparatus is washed after the used paper recycling apparatus 100 is used, since the recycled pulp hardly remains on the bottom surface of the storage tank 85, the inside of the storage tank 85 can be easily cleaned. , Workability is improved.

In addition, the support member 68 positioned behind the scraping member 95 with respect to the rotation direction U of the stirring blade 81 is formed longer in the vertical direction than the front support member 54, and is a quarter of the vertical length of the scraping member 95. When the liquid containing the high-viscosity recycled pulp is scraped, the flexible scraping member 95 is bent backward by the viscosity of the liquid containing the recycled pulp and cannot be sufficiently scraped. Without causing such a problem, the scraping member 95 can be supported from behind by the support member 68 so as to be along the vertical direction, and the recycled pulp can be scraped efficiently.

The recycled pulp stored in the storage unit 8 flows out of the outlet 87 at a predetermined flow rate, flows through the pipe 89 and is sent to the dilution processing unit 9. In the dilution processing unit 9, the control unit 10 controls the dilution liquid flowing in the pipe 93 to flow into the liquid containing the regenerated pulp flowing in the pipe 89 to perform the dilution process. The dilution in the dilution processing unit 9 may be performed continuously without interruption, or may be performed intermittently. In the case of performing intermittently, after supplying the diluent at a predetermined flow rate from the pipe 93 for a predetermined time to the liquid containing the recycled pulp that circulates in the pipe 89, the supply of the diluent is temporarily interrupted. This is performed by a method of restarting the dilution process by causing the diluent to flow in at the same flow rate as before the interruption or at a different flow rate different from the flow before interruption. When the flow rate of the diluted liquid after the interruption is different from that before the interruption, the amount of the diluted liquid depends on the result of the concentration of the regenerated pulp measured for the liquid containing the regenerated pulp generated by the dilution before the interruption. Can be finely adjusted.

As described above, in the dilution processing unit 9, since the diluted liquid flowing through the pipe 93 is continuously flowed into the liquid containing the regenerated pulp flowing through the pipe 89, the diluted pulp is diluted. There is no need for a huge tank and stirring means for storing the contained liquid. Further, when white water in the white water tank 52 is used as a diluent, white water generated by papermaking in the paper making unit 3 is circulated and used as a diluent. Therefore, compared with the case where clean water is used as the diluent. The amount of white water stored in the white water tank 52 can be reduced, and the white water tank 52 can be made small.

The liquid containing the regenerated pulp diluted in the dilution processing unit 9 is sent to the deinking unit 2, and the deinking process is performed, and the obtained liquid containing the regenerated pulp after deinking is sent to the paper making unit 3.

As shown in FIG. 6, the paper making unit 3 is a fiber layer in which a liquid containing recycled pulp is uniformly supplied onto the mesh belt 36 running from the head box 31, drained, and contains a relatively large amount of moisture. A wet paper 64 is formed. The water flowing down below the mesh belt 36 is received by the water receiving part 37 and sent from the water receiving part 37 to the white water tank 52.

When the wet paper 64 on the mesh belt 36 reaches the end of the forward path, the wet paper 64 is transferred to the water absorption belt 39 on the upper side of the dewatering unit 33. Thereafter, the wet paper 64 is sandwiched between the lower water absorption belt 39 and dehydrated by absorbing the moisture contained in the wet paper 64 to the water absorption belt 39 side, and is further squeezed and dehydrated by the squeezing roller 44. The

The wet paper 64 is sent from the dewatering unit 33 to the dryer unit 34 and is sandwiched between a pair of upper and lower drying belts 47 that travel. The drying belt 47 is brought into contact with the plurality of drying rollers 46 heated by the heater 49 and maintained at a predetermined temperature, and the wet paper 64 is conveyed, whereby the wet paper 64 is dried, and before finishing. Recycled paper 65 is obtained.

The unfinished recycled paper 65 exiting the dryer section 34 is sent to the calendar section 41 and passed between the plurality of press rollers 43. As a result, the flatness of the recycled paper 65 before finishing is improved, and the cut paper 42 is further cut into a predetermined sheet size to complete the recycled paper 7.

The broken material of the recycled paper 65 before finishing which is no longer necessary as a result of being cut in the cutting unit 42 is returned to the recycled pulp unit 1 as shown in FIG.

Wastewater in the deinking drainage tank 51 that is highly contaminated and difficult to reuse among wastewater sent to the wastewater treatment unit 5 in each process is used after being subjected to predetermined wastewater treatment if necessary. 100 is discharged to the outside. The white water in the white water tank 52 having a low degree of contamination and reusable is subjected to a treatment such as removing ink components, toner components and the like through a filter and adding a chemical to neutralize the pulp, if necessary. Then, it is supplied to the dilution processing unit 9 etc. and used again.

(Second Embodiment)
FIG. 7 is a plan view of the storage tank 85 according to the second embodiment, and FIG. 8 is a partially enlarged perspective view of the lower part of the storage tank 85. In the second embodiment, the scraping portion 90 a has a recess 97 that is recessed backward with respect to the rotation direction T of the stirring blade 81, and this recess 97 is the outlet when the stirring blade 81 rotates. It is configured to pass above 87.

That is, as shown in FIG. 7, the scraping member 95 a constituting the scraping portion 90 a has a shape bent in an L shape in a plan view, and this bent portion constitutes a recessed portion 97. In FIG. 7, when the rotation direction T of the stirring blade 81 is clockwise, the expanded tip portion 99 of the scraping member 95 is positioned forward and the recess 97 is positioned rearward with respect to the rotation direction T of the stirring blade 81. doing.

The scraping member 95 a is sandwiched between the pair of support members 54 a and 68 a and is fixed to the lower portion of the stirring blade 81. As shown in FIG. 8, the support member 68 a positioned rearward with respect to the rotation direction T of the stirring blade 81 is formed by bending a plate-like member at a plurality of locations and extending downward. The hanging portions 55 and 53 are provided.

One of the hanging portions 55 and 53 is fixed to the lower portion of the stirring blade 81 with a screw 96a. The other hanging portion 53 is disposed along the rear side of the scraping member 95a, and sandwiches the scraping member 95a between the support member 54a positioned in front of the rotation direction T of the stirring blade 81. The hanging portion 53, the scraping member 95a, and the support member 54a are connected by a screw 96b.

The support member 68a is rigid and holds the shape of the flexible scraping member 95a in an L shape, and is positioned behind the scraping member 95a with respect to the rotation direction T of the stirring blade 81. The hanging portion 53 of 68a is formed in about three-quarters of the vertical length of the scraping member 95a.

When all the liquid containing the regenerated pulp stored in the storage unit 8 is taken out from the outlet 87 to the pipe 89, the regenerated pulp scraped by the scraping member 95a is moved to the recess 97 by the rotation of the stirring blade 81. Gather. And when the hollow part 97 passes above the outflow port 87, the recycled pulp collected in the hollow part 97 falls to the lower outflow port 87 by its own weight, and is sucked into the outflow port 87 by driving the pump 91. It flows out from the outlet 87.

In this way, the regenerated pulp that stays in a wide range of the bottom surface 85a of the storage tank 85 can be scraped by the scraping portion 90a and collected in the hollow portion 97, and can be sent from the outlet 87 to each portion of the subsequent stage. . Therefore, the amount of regenerated pulp remaining in the storage tank 85 can be reduced as compared with the scraping unit 90 in the first embodiment.

(Third embodiment)
FIG. 9 is a plan view of a storage tank 85 according to the third embodiment, and FIG. 10 is an enlarged perspective view of a lower portion of the storage tank 85. As shown in FIG. 9, in the third embodiment, the scraping member 95b constituting the scraping portion 90b is formed in a rectangular thin plate shape, and at two locations near the tip of the thin plate scraping member 95b. It is formed by bending at an obtuse angle along the vertical direction. The scraping member 95b is sandwiched between a pair of rigid support members 54b and 68b. The holding member 54b positioned in front of the scraping member 95b with respect to the rotation direction S of the stirring blade 81 is attached only to the upper portion of the scraping member 95b, while the support member 68b positioned behind the scraping member 95b is From the upper end of the scraping member 95b, it is attached from the upper end of the scraping member 95b to a length position that is about three quarters of the vertical length. The upper part on one end side of the scraping member 95b sandwiched between the front and rear support members 54b and 68b is screwed to the lower part of the stirring blade 81 with a screw 96c, and the bent portion on the other end side is connected to the stirring blade 81. A recess 97a that is recessed rearward with respect to the rotation direction S is formed. 9 and 10, the rotation direction S of the stirring blade 81 is shown as a counterclockwise direction that is opposite to the rotation direction T of FIG.

The support member 68b is connected to the lower portion of the stirring blade 81 by a connecting member 69 in a triangular shape in plan view. The support member 68b has rigidity and supports the flexible scraping member 95a at a predetermined angle, and supports the scraping member 95b when the stirring blade 81 is rotated from the rear.

Further, unlike the outflow port 87 in the first and second embodiments, the outflow port 87a is provided at a position in the radial direction R of the storage tank that is far from the center of the storage tank 85 and close to the side wall.

When the recycled pulp staying in the storage tank 85 is scraped using the scraping portion 90b according to the third embodiment, the recycled pulp scraped to the scraping portion 90b is accompanied by the rotation of the stirring blade 81. Then, it moves rearward in the rotational direction S along the flat plate surface of the scraping member 95b and is collected in the recess 97a. And when the hollow part 97a passes above the outlet 87a, the recycled pulp collected in the hollow part 97a falls to the outlet 87a below due to its own weight, and is sucked into the outlet 87a by driving the pump 91, It flows out from the outflow port 87a.

Thereby, the regenerated pulp remaining in a wide range of the bottom surface 85a of the storage tank 85 can be scraped by the scraping portion 90b and collected in the hollow portion 97a, and can be sent from the outlet 87a to each part in the subsequent stage. The amount of regenerated pulp remaining in the tank 85 can be reduced. Further, the discharge port 87a of the storage tank 85 according to the third embodiment differs from the outflow port 87 in the first and second embodiments in that the position of the storage tank 85 in the radial direction R is far from the center of the storage tank 85. However, even in such a case, the position of the recess 97a is adjusted to a position that passes above the outflow port 87a when the stirring blade 81 rotates, thereby storing the recess 97a. The recycled pulp staying in the lower part of the tank 85 can be reliably discharged from the outlet 87a.

In the above embodiment, the scraping portions 90, 90a, and 90b are configured by the scraping members 95, 95a, and 95b that are separate members from the stirring blade 81, but the present invention is not limited thereto, and the scraping portion is It may be formed integrally with the stirring blade 81. Further, although a pair of scraping members 95, 95a, and 95b is provided, only one of the left and right sides may be provided, or it may be divided into three or more. The scraping members 95, 95a, and 95b are screwed to the lower portion of the stirring blade 81 with screws 96, 96a, 96b, and 96c, but may be fixed using an adhesive or the like.

The scraping members 95, 95a, 95b are sandwiched between the pair of support members 54, 54a, 54b and 68, 68a, 68b, but are fixed directly to the lower portion of the stirring blade 81 without providing a support member. May be.

T, S, U Rotating direction of stirring blade 1 Recycled pulp section 3 Papermaking section 6 Used paper raw material 7 Recycled paper 18 Pulper 81 Stirring blade 85 Storage tank 87, 87a Outlet 90, 90a, 90b Scraping section 97, 97a Recessed section 100 Waste paper recycling processor

Claims (2)

A pulper that has a pulper that breaks out the waste paper raw material to produce recycled pulp, and supplies recycled pulp to the papermaking section at the later stage; and
In a used paper recycling apparatus comprising a papermaking section for making recycled paper by making paper from recycled pulp supplied from the recycled pulp section,
In the middle of the transfer path for transferring the recycled pulp from the pulper to the papermaking unit, a storage tank for storing the recycled pulp flowing in from the upstream side of the transfer path and supplying the downstream side of the transfer path is provided,
The storage tank includes a stirring blade that stirs the regenerated pulp stored therein, a driving unit for the stirring blade, and an outlet that flows out the regenerated pulp formed on the bottom surface of the storage tank to the downstream side. ,
In the lower part of the stirring blade, a recycled pulp that stays in the lower part of the storage tank is provided, and a scraping part that scrapes the recycled pulp to the outlet.
The used paper recycling apparatus , wherein the scraping portion is formed integrally with the stirring blade, or a scraping member constituting the scraping portion is fixed to the stirring blade . The scraping part has a hollow part recessed backward with respect to the rotation direction of the stirring blade,
The used paper recycling apparatus according to claim 1, wherein the hollow portion passes above the outlet when the stirring blade rotates.

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