JP5407071B2 - Waste paper recycling processor and waste paper recycling method - Google Patents

Description

  The present invention relates to a used paper recycling processing apparatus and a used paper recycling processing method.

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, Patent Documents 1 and 2 below disclose a waste paper processing apparatus that can reduce the size of the apparatus and process waste paper at a paper consumption place. Patent Document 1 discloses a waste paper recycling method and apparatus as follows: A step of separating recycled paper cut by a document cutting machine into a recycled pulp, a step of storing the recycled pulp, a step of filling the recycled pulp into an injection device and spraying the fiber sheet, and a recycled pulp sprayed on the fiber sheet A configuration including a paper making process is described.

 Patent Document 2 discloses that a recycled pulp section for separating recycled paper to prepare recycled pulp, a deinked pulp section for bleaching recycled pulp to prepare deinked pulp, and paper for deinked pulp. A used paper processing apparatus that integrally includes a papermaking section for preparing recycled paper is described.

JP-A-10-317290 JP 2009-299228 A

In the above Patent Documents 1 and 2, in each step, it is described that the concentration of regenerated pulp with respect to water should be adjusted to the optimum condition for each step, but in order to adjust the concentration of regenerated pulp, It is necessary to provide a water supply facility, a concentration adjustment tank, and the like, which causes a problem that the entire used paper recycling apparatus is enlarged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a used paper processing apparatus and a used paper processing method capable of reducing the size of a used paper recycling processing apparatus while improving the processing efficiency of used paper.

  In order to achieve the above-mentioned object, the recycled paper recycling apparatus according to claim 1, wherein the recycled paper raw material is produced in a stirred tank together with water supplied from a water supply unit to produce a recycled pulp-containing liquid, A paper making unit for making a recycled pulp-containing liquid produced in the recycled pulp part, and a transfer path for sending the recycled pulp-containing liquid from the recycled pulp part to the paper making part, have a predetermined recycled pulp concentration. In a used paper recycling apparatus comprising a pump capable of transferring a recycled pulp-containing liquid and a control unit for controlling the operation of each part, a diluent for supplying the diluted liquid to the recycled pulp-containing liquid flowing through the transfer path A flow path is provided, and the diluting liquid flowing through the diluting liquid flow path is caused to flow into the recycled pulp-containing liquid flowing through the transfer path to dilute the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid to a predetermined concentration. A treatment unit is provided downstream of the pump in the transfer path, and the control unit regenerates the recycled pulp-containing liquid in the recycled pulp unit, supplies water from the water supply unit to the stirring tank, and stores it in the stirring tank. While controlling so that the density | concentration of the regenerated pulp contained in a pulp containing liquid may be diluted to the predetermined | prescribed 1st density | concentration which can be transferred with the said pump, the density | concentration of the regenerated pulp contained in the regenerated pulp containing liquid in the said dilution process part Is controlled to be diluted to a predetermined second density that is lower than the first density and equal to or higher than the papermaking density in the papermaking section.

Further, the invention according to claim 2 is the waste paper recycling apparatus according to claim 1, wherein the recycled pulp-containing liquid is provided between the pump and the dilution processing unit in the transfer path and flows from the upstream side of the transfer path. A storage tank for storing a predetermined amount is provided.

According to a third aspect of the present invention, in the used paper recycling apparatus of the first or second aspect, the printing component that floats on the liquid level of the recycled pulp-containing liquid stored in the storage tank in the storage tank The removal part which removes the foam-like substance containing is provided.

  Furthermore, in the invention according to claim 4, in the used paper recycling apparatus according to any one of claims 1 to 3, the recycled pulp-containing liquid stored in the storage tank is agitated in the storage tank. It is provided with a stirring means.

Furthermore, the invention according to claim 5 is the waste paper recycling apparatus according to claim 4, wherein the control unit changes the amount of stirring by the stirring means in accordance with the amount of the recycled pulp-containing liquid stored in the storage tank. It controls to do.

The invention according to claim 6 is to produce a recycled pulp-containing liquid by stirring the used paper raw material together with water supplied from the water supply section in a stirring tank, and papermaking the obtained recycled pulp-containing liquid in the papermaking section. In the recycled paper recycling method for producing recycled paper, after the production of the recycled pulp-containing liquid, the recycled pulp containing liquid is supplied to the stirring tank from the water supply unit and stored in the stirred tank. The recycled pulp-containing liquid after dilution is diluted to a predetermined first concentration that enables transfer of the recycled pulp-containing liquid by a pump having a predetermined capacity for sending the recycled pulp-containing liquid from the section to the papermaking section. The pump is driven to circulate the transfer path from the recycled pulp section to the papermaking section, and in the dilution processing section provided downstream of the pump in the transfer path, the recycled pulp-containing liquid flowing through the transfer path Diluting liquid flowing through the liquid flow path, and diluting the concentration of the recycled pulp in the recycled pulp-containing liquid to a predetermined second concentration that is lower than the first concentration and equal to or higher than the papermaking concentration in the papermaking section. The present invention relates to a characteristic waste paper recycling method.

According to the used paper recycling apparatus of claim 1, after the production of the recycled pulp-containing liquid in the recycled pulp section, the control section supplies the recycled pulp-containing liquid that is supplied from the water supply section to the stirring tank and is stored in the stirring tank. The concentration of the recycled pulp contained therein is controlled to be diluted to a predetermined first concentration that can be transferred by a pump capable of transferring a recycled pulp-containing liquid having a predetermined recycled pulp concentration, and a dilution process In the regenerated pulp-containing liquid, the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid is controlled to be diluted to a predetermined second concentration that is lower than the first concentration and equal to or higher than the papermaking concentration in the paper-making section. The concentration of the recycled pulp is diluted to the first concentration in the stirring tank, and diluted to a predetermined second concentration lower than the first concentration in the dilution processing unit and higher than the concentration suitable for papermaking. By installing a low-priced and relatively small pump that has the ability to divide the recycled pulp-containing liquid into multiple times, dilute it in stages, and transfer only the recycled pulp-containing liquid having a predetermined first concentration or less. In addition, since dilution is performed in the dilution processing unit, a huge tank and stirring means for storing the recycled pulp-containing liquid after dilution are not required. Therefore, by diluting the recycled pulp to a predetermined concentration suitable for disaggregation and papermaking, it is possible to achieve downsizing of the entire apparatus while improving waste paper processing efficiency.

Further, according to the used paper recycling processing apparatus according to claim 2, a predetermined amount of the recycled pulp-containing liquid that is provided between the pump and the dilution processing unit in the transfer path and that flows from the upstream side of the transfer path is stored. Since it is equipped with a storage tank, it is possible to supply new waste paper raw material and water by taking out the recycled pulp-containing liquid from the recycled pulp section, and to start the next disaggregation process, and to disaggregate the newly supplied waste paper raw material. During the process, the recycled pulp-containing liquid stored in the storage unit in parallel can be supplied to the subsequent process at a predetermined flow rate, and continuous processing can be performed.

  And according to the used paper recycling apparatus of Claim 3, a control part makes the storage tank the foam containing the printing component which floats on the liquid level of the recycled pulp containing liquid stored in this storage tank. Since the removal part to remove is provided, the quality of the recycled paper obtained by papermaking can be improved by reducing the quantity of the printing component mixed in the recycled pulp containing liquid.

  Further, according to the used paper recycling apparatus according to claim 4, since the storage tank is provided with a stirring means for stirring the recycled pulp-containing liquid stored in the storage tank, The recycled pulp-containing liquid can be sufficiently dispersed in the recycled pulp-containing liquid, and the concentration of the recycled pulp in the recycled pulp-containing liquid transferred to the subsequent stage can be made to be a substantially uniform concentration.

  Furthermore, according to the used paper recycling apparatus of claim 5, the control unit controls to change the amount of stirring by the stirring means in accordance with the amount of the recycled pulp-containing liquid stored in the storage tank. Problems such as scattering of recycled pulp and water due to an excessive amount and precipitation of recycled pulp due to an excessive amount of stirring can be solved.

Furthermore, according to the waste paper recycling method according to claim 6, after the production of the recycled pulp-containing liquid, the recycled pulp-containing liquid contained in the recycled pulp-containing liquid is supplied to the stirring tank from the water supply unit and stored in the stirring tank. The concentration is diluted to a predetermined first concentration that enables transfer of the recycled pulp-containing liquid by a pump having a predetermined capacity for sending the recycled pulp-containing liquid from the recycled pulp section to the papermaking section. The recycled pulp-containing liquid is circulated through the transfer path from the recycled pulp section to the papermaking section by driving the pump, and in the dilution processing section provided downstream of the pump in the transfer path, The diluent that flows through the diluent flow path is introduced, and the concentration of the recycled pulp in the recycled pulp-containing liquid is diluted to a predetermined second concentration that is lower than the first concentration and equal to or higher than the papermaking concentration in the papermaking section. Therefore, by dividing the dilution of the recycled pulp-containing liquid into a plurality of times and performing the dilution stepwise, the recycled pulp is diluted to a predetermined concentration suitable for disaggregation and papermaking, improving the waste paper processing efficiency, and the entire apparatus Downsizing can be realized.

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 a perspective view of the water supply part of the said recycled pulp manufacturing part. Schematic configuration of a storage unit of the used paper recycling apparatus It is the top view and sectional drawing of the deinking part of the said used paper reproduction | regeneration processing apparatus. It is a schematic perspective view of the papermaking part and the finishing calendar part of the used paper recycling 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 includes a recycled pulp unit 1, a storage unit 8, a deinking unit 2, a paper making unit 3, a finishing unit 4, a drainage processing unit 5, and a control unit (not shown). It is to be prepared. The recycled pulp unit 1 disaggregates the waste paper raw material 6 to produce a recycled pulp-containing liquid, and the storage unit 8 temporarily stores the recycled pulp-containing liquid produced in the recycled pulp unit 1. 2 is for deinking the recycled pulp-containing liquid stored in the storage unit 8, and the papermaking unit 3 is for papermaking the recycled pulp-containing liquid deinked in the deinking unit 2 or the recycled pulp-containing liquid from the storage unit 8. The wet paper obtained by paper making is dried, and the finishing unit 4 finishes the paper obtained by drying the wet paper in the paper making unit 3 by calendering, cutting, etc. The drainage processing unit 5 processes the drainage generated by the used paper recycling process. The control unit controls the operation of each unit.

(Recycled pulp section)
FIG. 2 is a schematic configuration diagram of the recycled pulp unit 1 and the pump 77. The regenerated pulp unit 1 disaggregates the waste paper raw material 6 to produce regenerated pulp, and is constituted by a regenerated pulp manufacturing apparatus K. As shown in FIG. 2, the recycled pulp manufacturing apparatus K includes a used paper raw material supply unit 9, a measurement unit 17, a pulper 18, and a control unit (not shown).

As the used paper raw material 6, it is possible to process both a rough paper 66 which is a used paper raw material 6 having a size equal to or larger than a predetermined size and a shredded paper 67 which is a used paper raw material 6 having a size smaller than a predetermined size. The rough paper 66 includes regular paper such as A4 and B5, and further includes waste paper raw material 6 other than regular paper such as square. In addition, the shredded paper 67 includes a waste paper raw material 6 cut to a size smaller than a predetermined size by a cutting device such as a shredder. Further, if the size is smaller than the predetermined size, the waste paper raw material not cut by the cutting device 6 is also included.

The used paper raw material supply unit 9 includes a rough paper supply unit 11 that supplies the rough paper 66 and a shredded paper supply unit 12 that supplies the shredded paper 67. The rough paper supply unit 11 includes a rough paper placing table 111 on which the rough paper 66 is placed, a lifting / lowering unit (not shown) for raising and lowering the rough paper placing table 111, and a plurality of pieces placed on the rough paper placing table 111. The paper feed roller 112 that transports the uppermost coarse paper 66 to the measurement unit 17 is provided.

The shredded paper supply unit 12 is provided with a shredder tank 121 for storing the shredded paper 67, and a discharge port 122 for the shredded paper 67 is formed at the bottom of the shredder tank 121. The discharge port 122 is provided with an opening / closing member 124 that can be opened and closed by swinging as shown by a two-dot chain line in FIG. 2. A shredder is provided above the opening / closing member 124 when the opening / closing member 124 is opened. A discharge device 125 for discharging the shredded paper 67 in the tank 121 downward is provided. The configuration of the discharge device 125 is not particularly limited as long as the shredded paper 67 can be discharged downward. FIG. 2 shows a pair of rotating bodies 127, and the rotating bodies 127 are both rotating bodies 127. The shredded paper 67 is sandwiched between them and rotated to discharge the shredded paper 67 downward.

The measurement unit 17 measures the weight of the used paper raw material 6 supplied from the rough paper supply unit 11 and the shredded paper supply unit 12. The measurement unit 17 is disposed at a slightly lower position below the discharge port 122 and downstream in the conveyance direction of the rough paper 66 by the paper feed roller 112. The measuring unit 17 includes a tray 171 that receives the rough paper 66 and the shredded paper 67.

The tray 171 may have a sufficiently large size so that the entire amount of the used paper raw material 6 to be processed in one batch type disaggregation process can be placed, but a part of the total amount of the used paper raw material 6 can be placed. The size may be smaller than the case where the entire amount is placed.

Similarly, with respect to the weight that can be measured by the measurement unit 17, a measuring device that can measure the total amount of used paper raw material 6 to be processed in one batch-type disaggregation process may be used. It is good also as a structure which can measure the whole quantity only when a small measuring device which can measure only a part of them is used, and the measurement is divided into a plurality of times and combined.

As shown by a two-dot chain line in FIG. 2, the tray 171 is configured to be tiltable from a horizontal posture to a tilted posture tilting toward the pulper 18, and driving means (not shown) such as a motor that tilts the tray 171. Have. Further, in the tilting posture, the tray 171 is not provided with a side wall on the low position side, and the used paper raw material 6 can be dropped onto the pulper 18 only by tilting the tray 171.

The pulper 18 disaggregates the waste paper raw material 6 input from the measuring unit 17 into fibers, that is, recycled pulp, in the liquid of water and a disaggregation accelerator. The stirrer 181, the water supply unit 182, and the disaggregation accelerator supply A part 183, a stirring means 189, and a recycled pulp-containing liquid extraction part 187. The size of the agitation tank 181 is large enough to store the water supplied from the water supply unit 182 and the liquid containing the waste paper raw material 6 and perform the disaggregation process, and is manufactured after the disaggregation process is completed. The regenerated pulp-containing liquid obtained by diluting the regenerated pulp-containing liquid with water supplied from the water supply unit 182 to a predetermined first concentration is accommodated.

Here, the predetermined first concentration is the concentration of the regenerated pulp that can be transferred to the regenerated pulp-containing liquid by a pump 77 for taking out the regenerated pulp-containing liquid from the regenerated pulp-containing liquid extraction unit 187 described later. The first density is set higher than a predetermined density suitable for the deinking process in the deinking part 2, and when the deinking process in the deinking part 2 is omitted, a predetermined density suitable for papermaking in the paper making part 3 is set. Set higher.

The water supply unit 182 is connected to a supply unit (not shown) of tap water or the like, and a white water tank 52 (see FIG. 1) of the drainage processing unit 5 described later, and is stored in the clean water or the white water tank 52. One of the white water to be supplied is supplied to the stirring tank 181. A plurality of the water supply units 182 are provided at the upper part of the inner wall surface of the stirring tank 181, and the water supply unit 182 includes a discharge unit 76 that discharges the water toward the inner wall surface of the stirring tank 181.

Although the structure of the discharge part 76 will not be specifically limited if the said water can be discharge | released toward the inner wall face of the stirring tank 181, For example, what is shown in FIG. 3 is mentioned. FIG. 3 shows an exploded perspective view of a water supply unit 182 including the discharge unit 76 as an example of the discharge unit 76. The water supply unit 182 shown in FIG. 3 includes a discharge unit main body 15 and a contact plate 14 having a bent lower part. The discharge unit main body 15 and the contact plate 14 are screwed to the inner wall surface of the stirring tank 181 by screws 25. .

The discharge portion main body 15 is provided with a water supply hole 16 in alignment with a water supply hole portion 53 formed so as to penetrate the inner wall surface of the stirring tank 181. A side surface of the discharge portion main body 15 facing the water supply hole 16 is opened, and the opened side surface is closed by the contact plate 14. A space portion 13 through which water from the pipe 54 circulates is formed inside the discharge portion main body 15.

At the bottom of the discharge unit main body 15, a discharge part 76 for discharging the water that has circulated through the space part 13 is formed to be open, and the water discharged from the discharge part 76 is removed by the lower part 14 a of the bent plate 14. The water is guided to the inner wall surface of the agitation tank 181 and water is supplied from the pipe 54 to the space portion 13 at a predetermined flow rate, so that the water discharged from the discharge portion 76 spreads over a wide area of the inner wall surface. Then, it flows down and the recycled pulp, the disaggregation accelerator and the like adhering to the inner wall surface of the stirring tank 181 are washed.

As shown in FIG. 2, the disaggregation accelerator supply unit 183 is provided above the stirring tank 181. As the disaggregation accelerator supplied from the disaggregation accelerator supply unit 183, one or more selected from alkalis such as sodium hydroxide, sodium carbonate, sodium silicate, potassium hydroxide, sodium sulfite, or an aqueous solution thereof is used. In addition, acids such as sulfamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, and aluminum sulfate, oxidizing agents such as sodium hypochlorite, sodium chlorite, and hydrogen peroxide, surfactants, bleaching agents, and PH stabilizers Further, chelating agents, dispersing agents and the like can be used supplementarily.

The stirring means 189 is provided at the bottom of the stirring tank 181 and is driven by a stirring blade 184 for stirring and separating the waste paper raw material 6 together with water supplied from the water supply unit 182 and a motor for driving the stirring blade 184 to rotate. Means 188. The type of the stirring blade 184 is not particularly limited, but an axial flow type stirring blade 184 such as a propeller, paddle, or turbine is preferable.

Although not shown, the stirring tank 181 is provided with a heater and a temperature sensor (not shown) for heating the liquid stored in the stirring tank 181 to a predetermined temperature.

The recycled pulp-containing liquid take-out section 187 is provided at the bottom of the stirring tank 181 and takes out a recycled pulp-containing liquid containing recycled pulp, water, etc. produced by disaggregating the waste paper raw material 6 in the stirring tank 181. is there. A pipe 78 is connected to the recycled pulp-containing liquid extraction unit 187, and the pipe 78 includes an on-off valve 79. This pipe 78 constitutes a part of a transfer path for sending the recycled pulp-containing liquid from the stirring tank 181 to the papermaking section 3 on the downstream side.

A pump 77 is disposed between the recycled pulp unit 1 and the storage unit 8. The pump 77 is provided on the downstream side of the on-off valve 79 of the pipe 78 connecting the recycled pulp section 1 and the storage section 8, and the recycled pulp-containing liquid taken out from the recycled pulp-containing liquid extraction section 187 by driving the pump 77. Is sent to a storage section 8 provided in the middle of the transfer path.

As the pump 77, a snake pump, a Mono pump, a tube pump, or the like can be used. Even when the concentration of the regenerated pulp in the regenerated pulp-containing liquid is relatively high, such as the concentration of the regenerated pulp at the end of the disaggregation treatment. It is possible to use a pump capable of transporting, but by using a pump capable of transporting only when the concentration of recycled pulp in the recycled pulp-containing liquid is not more than a predetermined concentration, an inexpensive and relatively small-sized pump can be used. A pump can be installed to reduce manufacturing costs and reduce the overall size of the apparatus. Furthermore, it is more preferable to use a tube pump that is inexpensive, small and has a simple structure and is easy to maintain. When the pump 77 is a tube pump, it is possible to prevent the recycled pulp-containing liquid from flowing through the pipe 78 by stopping the operation of the tube pump. .

(Reservoir)
FIG. 4 shows a schematic configuration diagram of the storage unit 8. The storage unit 8 is provided in the middle of the transfer path on the downstream side of the recycled pulp unit 1, and includes a storage tank 85 and a dilution processing unit 86. The storage tank 85 temporarily stores a predetermined amount of the recycled pulp-containing liquid that circulates in the pipe 78 by driving the pump 77, and the storage tank 85 includes a stirring unit 80. In FIG. 4, the stirring means 80 shows a plate-like stirring blade 81 having a width slightly smaller than the inner diameter of the storage tank 85 and a driving means 82 for the stirring blade 81. Window portion 83 is formed.

The agitation means 80 in the storage tank 85 is not limited to the agitation blade 81 shown in FIG. 4, and has another configuration in which a predetermined amount of air is supplied to the recycled pulp-containing liquid stored in the storage tank 85 and agitation is performed. There may be. Further, when the stirring blade 81 is used, it may have another shape different from the stirring blade 81 shown in FIG. 4, or a commercially available one may be used. When a commercially available stirring blade is used, a radial flow is generated in the storage tank 85 such as a propeller, paddle, turbine, or the like that generates an axial flow in the storage tank 85, or a ribbon, anchor, pincushion type, portal type, or the like. The resulting type can be used. Among these, an agitating blade that generates a radiant flow in the storage tank 85 such as an anchor, a pincushion type, a gate type or the like is preferably used.

The storage tank 85 is provided with a removing unit 88 that removes foams 87 containing printing components such as toner components floating on the surface of the recycled pulp-containing liquid stored in the storage tank 85. The removal unit 88 is not particularly limited as long as the foam 87 can be removed from the storage tank 85. In addition to the suction means 90 for sucking and removing the foam 87 as shown in FIG. An adsorbing means for adsorbing and removing the adsorbent and a means for adhering and removing the adsorbent to a sheet material such as a non-woven fabric can be used.

As shown in FIG. 4, when the suction means 90 is used as the removing unit 88, it is preferable to open the suction port 90 a at the approximate center of the upper portion of the storage tank 85 that is the rotation center of the stirring blade 81. In the storage tank 85, when the regenerated pulp-containing liquid to be stored is stirred by the stirring blade 81, the printing component adheres to the foam and floats on the liquid surface, and floats at the center of the liquid surface that is the rotation center of the stirring blade 81. It is easy.

In addition, the other end side of the pipe 78 whose one end side is connected to the stirring tank 181 and the pipe 89 are connected to the bottom of the storage tank 85. The pipe 89 is provided with a pump 91 and an opening / closing valve 92 that take out the recycled pulp-containing liquid in the storage tank 85 and send it to the deinking section 2 or the papermaking section 3 on the downstream side. It constitutes a part of a transfer path for sending the recycled pulp-containing liquid from 85 to the downstream papermaking section 3.

The pump 91 can use a snake pump, a mono pump, a tube pump, etc. similarly to the pump 77 provided in the piping 78 which connects the stirring tank 181 and the storage tank 85, and the density | concentration of the regenerated pulp in regenerated pulp containing liquid It is preferable to use a pump capable of transferring only when the concentration is below a predetermined concentration, and it is more preferable to use a tube pump. When the pump 91 is a tube pump, it is possible to prevent the recycled pulp-containing liquid from flowing through the pipe 89 by stopping the operation of the tube pump. .

The dilution processing unit 86 is provided at a midway position downstream of the installation location of the pump 91 in the pipe 89 and has a structure in which one end of the pipe 93 is connected to the pipe 89. The dilution processing unit 86 causes the dilute liquid flowing through the dilute flow path constituted by the pipe 93 to flow into the regenerated pulp-containing liquid flowing through the pipe 89 constituting the transfer path, and is included in the regenerated pulp-containing liquid. The concentration of recycled pulp is diluted to a predetermined concentration. The other end side of the pipe 93 is connected to both a supply unit (not shown) of clean water and a white water tank 52 to be described later, and supplies the clean water or white water in the white water tank 52 as a dilution liquid. The recycled pulp containing liquid which distribute | circulates the inside is diluted.

In the dilution processing unit 86, the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid is lower than the first concentration and is equal to or higher than a predetermined deinking concentration in the deinking unit 2 or a papermaking concentration in the papermaking unit 3. Dilute to 2 concentrations.

(Deinking part)
FIG. 5A shows a plan view of the deinking section 2, and FIG. 5B shows a cross-sectional view taken along line AA in FIG. 5A. The deinking section 2 is called a floatator and is used for producing a recycled pulp after deinking by separating printing components such as ink components and toner components from the recycled pulp-containing liquid. A tank 221, a blade 222, and a bubble discharge tank 223 are provided.

The recycled pulp-containing liquid distribution tank 221 distributes the recycled pulp-containing liquid adjusted to a predetermined concentration by supplying the diluent in the stirring tank 181 and the dilution processing unit 86. The recycled pulp-containing liquid circulation tank 221 is partitioned into a plurality of deinking chambers 225 by a plurality of partition walls 224, and the left or right side of the partition walls 224 are alternately arranged as shown in FIG. All the deinking chambers 225 communicate with each other by opening.

At the bottom of each deinking chamber 225, a bubble supply unit 226 for supplying fine bubbles to the recycled pulp-containing liquid flowing in the recycled pulp-containing liquid circulation tank 221 is provided, and both of the partition walls 224 are provided. A temperature sensor 227 and a heater 228 are respectively arranged at substantially the center in the height direction of the surface. In addition, an inflow portion 229a for allowing the recycled pulp-containing liquid to flow into the recycled pulp-containing liquid circulation tank 221; and a recycled pulp-containing liquid containing the recycled pulp after deinking generated after the deinking process are used as the recycled pulp-containing liquid circulation tank 221. An outflow portion 229b that flows out is provided.

The blade 222 is for sweeping bubbles floating above the regenerated pulp-containing liquid circulation tank 221 over the peripheral wall of the regenerated pulp-containing liquid circulation tank 221, and sweeping out the bubbles to the bubble discharge tank 223 side. It is provided above the tank 221 and is configured to reciprocate while being guided by the guide rail 222b by driving the motor 222a.

As shown in FIG. 4 (a), the bubble discharge tank 223 is provided in a square shape in plan view so as to surround the outer periphery of the recycled pulp-containing liquid circulation tank 221, and in the recycled pulp-containing liquid circulation tank 221 during deinking, The bubbles generated and swept out by the blade 222 are temporarily stored. The bubble discharge tank 223 is provided with a cleaning liquid ejecting section 223a that ejects a cleaning liquid such as water for washing away bubbles attached to the bubble discharge tank 223 and the blade 222 and the like. A plurality of cleaning liquid ejection portions 223a are provided over the entire circumference of the upper and middle steps of the wall surface in the bubble discharge tank.

In addition, at the bottom of the bubble discharge tank 223, an extraction unit 75 that extracts deinking drainage liquid generated by the disappearance of bubbles is provided, and the deinking drainage liquid extracted from the extraction unit 75 is deinked by the drainage processing unit 5. The liquid is sent to the drainage tank 52.

Further, the bubble discharge tank 223 preferably includes a defoaming part (not shown) for eliminating the generated bubbles. The structure of the defoaming part is not limited as long as bubbles can be eliminated. For example, a wind supply part (not shown) that supplies hot air or hot air can be used, and hot air or hot air is supplied from the wind supply part to the bubbles. Air bubbles are extinguished by blowing away the moisture of the air bubbles. In the case where such a wind supply unit is provided, it is more preferable that the warm air or hot air from the wind supply unit is dry hot air or hot air having a low moisture content. Thereby, the water | moisture content of a bubble can be blown away more easily.

The deinking process by the deinking unit 2 can be omitted. When the deinking process is omitted, the recycled pulp-containing liquid from the storage unit 8 is supplied to the papermaking unit 3 as shown in FIG. send.

(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 makes a paper containing the recycled pulp-containing liquid from the dilution processing unit 86 when the deinking by the deinking unit 2 is completed or 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 the deinked pulp-containing liquid or the regenerated pulp-containing liquid to the wire portion 32 and performing dehydration to obtain the wet paper 64. The upper portion of the head box 31 is open. A supply port 31a for the deinked pulp-containing liquid is formed in the lower part. Guide members 31b having a predetermined length are cantilevered along both side edges of the mesh belt 323 of the wire portion 32 at both ends in the longitudinal direction of the supply port 31a of the recycled pulp-containing liquid. The guide member 31 b prevents the recycled pulp-containing liquid supplied from the head box 31 onto the mesh belt 323 of the wire portion 32 from flowing down from the side edge of the mesh belt 323.

The wire portion 32 has a mesh belt 323 stretched over a plurality of rotating rollers 321, and the mesh belt 323 forms an endless track including an outward track 323a and a return track 323b. In addition, a water receiving portion 325 that receives water flowing down from the mesh of the forward path 323a is provided below the forward path 323a. The water receiving unit 325 is connected to a white water tank 52 (see FIG. 1) of the drainage processing unit 5 described later.

As shown in FIG. 6, the dewatering unit 33 has a pair of upper and lower endless water absorbing belts 332 a and 332 b made of felt that are respectively stretched between a plurality of rotating rollers 331, and includes an upper water absorbing belt 332 a and a lower water absorbing belt 332 a. A part of the water absorbing belt 332b is in contact with the water absorbing belt 332b. In a portion where the upper water-absorbing belt 332a and the lower water-absorbing belt 332b are partially in contact with each other, a plurality of a pair of squeezing rollers 334 are provided to squeeze the water-absorbing belts 332a and 332b.

The upper water-absorbing belt 332a and the lower water-absorbing belt 332b are shifted in position by a predetermined length, and the upper water-absorbing belt 332a is more upstream in the running direction of the wet paper 64 than the lower water-absorbing belt 332b. Has been placed. As a result, the wet paper 64 conveyed on the mesh belt 323 is first transferred to the upper water absorbing belt 332a, and then the wet paper 64 is not brought into contact with the lower water absorbing belt 332b until immediately before pressing by the pressing roller 334. I have to.

The dryer section 34 includes a plurality of rotating rollers 351 and a drying roller 343 disposed in a hood (not shown), and includes a pair of upper and lower conveying belts 342 spanned between the plurality of rotating rollers 351 and the drying roller 343. . The material of the conveyor belt 342 is not particularly limited. For example, cloth, heat-resistant resin, metal, or the like is used, and the upper and lower conveyor belts 342 run in a state where a part of the conveyor belts 342 is in contact. 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. 6, the finishing section 4 has a calendar section 41 and a cutting section 42 (see FIG. 1), and the calendar section 41 has a plurality of presses for increasing the flatness of the recycled paper 65 before finishing. The cutting unit 42 includes a cutting blade (not shown) that cuts 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, which 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 processing 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.

(Control part)
After the production of the regenerated pulp-containing liquid in the regenerated pulp unit 1, the control unit supplies water to the stirring tank 181 from the water supply unit, and the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid stored in the stirring tank 181 is determined by the pump 77. While controlling to dilute to the predetermined | prescribed 1st density | concentration which can be transferred, the density | concentration of the reproduction | regeneration pulp contained in the reproduction | regeneration pulp containing liquid in the dilution process part 86 is lower than a 1st density | concentration and is more than the density | concentration of papermaking in the papermaking part Control to dilute to a predetermined second concentration. Further, the control unit controls to change the amount of stirring by the stirring means 80 in accordance with the amount of the recycled pulp-containing liquid stored in the storage tank 85.

(Operation of the first embodiment)
The operation of the used paper processing apparatus 100 according to this embodiment will be described below. First, as shown in FIG. 2, the used paper raw material 6 of either the rough paper 66 or the shredded paper 67 is measured by the measuring unit 17, and the measured used paper raw material 6 is put into the pulper 18. At that time, any used paper raw material 6 of the rough paper 66 and the shredded paper 67 among the used paper raw material 6 may be processed first, and is not limited to any one.

When processing the coarse paper 66 as the used paper raw material 6, the coarse paper placing table 111 is moved up and down by an elevating unit, and the uppermost coarse paper 66 among the plurality of laminated coarse papers 66 is brought into contact with the paper feed roller 112. After the alignment, the paper feed roller 112 is rotated to convey the uppermost coarse paper 66 one by one to the tray 171. When the measurement value of the measurement unit 17 reaches a predetermined value set in advance, the rotation of the paper feed roller 112 is stopped and the conveyance is stopped.

Here, the predetermined value set in advance may be a predetermined value for the total amount of the used paper raw material 6 according to the processing capability of the measuring device constituting the measuring unit 17, and a part of the total amount may be a predetermined value. It is good also as dividing and supplying in multiple times.

On the other hand, when the shredded paper 67 is supplied as the waste paper raw material 6, as shown by a two-dot chain line in FIG. 2, the opening / closing member 124 is opened and the discharge device 125 is operated to cut the shredded paper 67 in the shredder tank 121. Is gradually dropped on the tray 171 and the weight of the shredded paper 67 placed on the tray 171 is measured. When the measurement value of the measurement unit 17 reaches a predetermined value, the discharge device 125 is stopped.

And the used paper raw material 6 measured by the measurement part 17 is thrown into the stirring tank 181 by driving the drive means which tilts the receiving tray 171 and tilting the receiving tray 171.

In the agitation tank 181, when the waste paper raw material 6 is put into the agitation tank 181, a predetermined amount of water required for the disaggregation process is supplied from the water supply unit 182, and the driving means 188 is driven to rotate the agitation blade 184. Keep it. Further, when the disaggregation accelerator supply unit 183 is provided, the disaggregation accelerator is charged into the stirring tank 181. Thereafter, as described above, the waste paper raw material 6 is put into the stirring tank 181 and the disaggregation process is performed. During the disaggregation process in the pulper 18, if necessary, a temperature sensor detects the temperature in the agitation tank 181 and energizes the temperature heater to supply a liquid containing the waste paper raw material 6 and water stored in the agitation tank 181. Maintain a predetermined temperature suitable for the disaggregation process.

After the disaggregation process is completed and the regenerated pulp-containing liquid is manufactured, the control unit performs water supply from the water supply unit 182 and controls to dilute the regenerated pulp concentration in the regenerated pulp-containing liquid to a predetermined first concentration. That is, for example, when the concentration of the regenerated pulp in the regenerated pulp-containing liquid is about 6.0 to 9.0% by weight at the end of disaggregation, water is supplied from the water supply unit 182 to the stirring tank 181 and the first concentration is 1. It shall be diluted to about 0 to 5.0% by weight.

Thus, after completion | finish of a disaggregation process, the density | concentration of the reproduction | regeneration pulp in a reproduction | regeneration pulp containing liquid is diluted to below a predetermined density | concentration, such as about 1.0 to 5.0 weight%, The reproduction | regeneration pulp containing liquid below this predetermined density | concentration Therefore, it is possible to install an inexpensive and relatively small pump capable of transferring only the gas, and it is possible to reduce the manufacturing cost and downsize the entire apparatus.

In the dilution in the stirring tank 181 after the disaggregation process is completed, the concentration of the recycled pulp in the recycled pulp-containing liquid is higher than a predetermined concentration suitable for the deinking process in the deinking unit 2, and the deinking unit 2 performs the deinking process. In the case of omitting the blackening treatment, the amount of the recycled pulp-containing liquid stored in the stirring tank 181 can be suppressed by setting the concentration higher than a predetermined concentration suitable for papermaking in the papermaking unit 3, and the stirring tank 181 is compared. Can be made smaller. If the stirring tank 181 is diluted at once to a predetermined recycled pulp concentration suitable for deinking or papermaking, a huge stirring tank for storing the recycled pulp-containing liquid after dilution must be installed. If a small agitation tank 181 is installed for the purpose of downsizing the apparatus, it is necessary to keep the amount of waste paper raw material 6 to be processed in a single batch type disaggregation process small, and the processing efficiency is very high. Reduce. On the other hand, as in this embodiment, by not diluting in the agitation tank 181 to a predetermined concentration finally required for deinking or papermaking, the processing amount of the used paper raw material 6 is maintained to some extent. Meanwhile, the size of the stirring tank 181 can be suppressed.

The dilution in the stirring tank 181 is performed by discharging water from the discharge portion 76 toward the inner wall of the stirring tank 181. Thereby, the regenerated pulp adhering to the inner wall surface of the stirring tank 181 during the disaggregation treatment can be washed away and included in the regenerated pulp-containing liquid stored in the stirring tank 181. Therefore, the regenerated pulp is left as it is attached to the inner wall surface of the stirring tank 181, and all the regenerated pulp produced is stored in the next step without reducing the concentration of the regenerated pulp in the regenerated pulp-containing liquid. Can be sent to part 8. In addition, the recycled pulp is not dried and hard to be removed by adhering to the inner wall surface of the stirring tank 181.

After the dilution to the first concentration is completed, the on-off valve 79 is opened, and the diluted pulp-containing liquid after dilution is taken out from the recycled pulp-containing liquid take-out section 187 and sent to the storage section 8 by driving the pump 77.

In the storage unit 8 shown in FIG. 4, the recycled pulp-containing liquid that has flowed from the pipe 78 is temporarily stored in the storage tank 85. Thereby, the new used paper raw material 6 and water can be supplied to the stirring tank 181 that has become empty by taking out the recycled pulp-containing liquid from the stirring tank 181, and the next batch-type disaggregation process can be started. Then, the recycled pulp-containing liquid stored in the storage unit 8 is continuously supplied to the deinking unit 2 or the paper making unit 3 at a predetermined flow rate while the newly supplied waste paper raw material 6 is being disaggregated. Each step in the subsequent stage can be performed.

At that time, the flow rate of the regenerated pulp-containing liquid that flows out from the storage tank 85 through the pipe 89 and the regenerated pulp-containing liquid that has been manufactured in the regenerated pulp unit 1 and diluted to a predetermined first concentration are stored in the storage tank 85 from the pipe 78. The timing of inflow into the storage tank is adjusted so that a predetermined amount or more of the recycled pulp-containing liquid is continuously stored in the storage tank 85 without interruption. Thereby, the recycled pulp containing liquid manufactured by the batch type disaggregation process can be continuously continuously supplied to the deinking section 2 or the papermaking section 3.

When storing the regenerated pulp-containing liquid in the storage tank 85, the driving means 82 is driven, the stirring blade 81 is rotated, and the regenerated pulp-containing liquid is stirred. Thereby, the regenerated pulp which is easy to precipitate can be sufficiently dispersed in the regenerated pulp-containing liquid, and the concentration of the regenerated pulp in the regenerated pulp-containing liquid which is transferred to the deinking section 2 or the papermaking section 3 and continuously processed is reduced. It can be about the same.

Stirring by the stirring blade 81 in the storage tank 85 aims to disperse the regenerated pulp, so that the rotation speed of the stirring blade 81 can be made relatively low, thereby reducing power consumption and suppressing cost. can do. For example, in the case where the stirring blade 81 is a type of stirring blade that generates an axial flow in the storage tank 85, the stirring blade 81 can be set to 600 to 1500 rpm, and more preferably about 800 to 1200 rpm. In the case of a stirring blade of a type that generates a radiant flow in the storage tank 85, it can be 10 to 100 rpm, more preferably about 30 to 60 rpm.

As described above, the type of stirring blades that generate the radiant flow is not limited to a part of the recycled pulp-containing liquid in the storage tank 85, even if the rotation speed is lower than that of the type of stirring blades that generate the axial flow. Stirring is possible, and power consumption can be further reduced. Furthermore, the type of stirring blades that generate a radiant flow can sufficiently disperse the regenerated pulp even when rotating at a low speed as compared with the type of stirring blades that generate an axial flow. It is not necessary to perform control according to the amount of the recycled pulp-containing liquid stored in the tank.

On the other hand, when the type of the stirring blade 81 uses a stirring blade that generates an axial flow in the storage tank 85 such as a propeller, depending on the amount of the recycled pulp-containing liquid stored in the storage tank 85, the recycled pulp Problems such as sedimentation, splashing of recycled pulp and water, and noise. Therefore, when the stirring blade 81 is a type of stirring blade that generates an axial flow in the storage tank 85, when the amount of liquid in the storage tank 85 is large, by increasing the rotational speed of the stirring blade 81, Recycled pulp that easily settles can be sufficiently dispersed. Conversely, when the amount of liquid in the storage tank 85 is small, the rotation speed of the stirring blade 81 is slowed down, so that the recycled pulp, water scattering, noise, etc. This problem can be solved.

Even when the stirring unit 80 is configured to supply air and perform stirring, similarly to the case where the stirring blade 81 is a type of stirring blade that generates an axial flow in the storage tank 85, the amount of stirring by the stirring unit 80 is determined as follows. Adjust according to the amount of recycled pulp-containing liquid stored in the storage tank 85. When the amount of liquid is large, the amount of air supply is increased to increase the amount of stirring, and when the amount of liquid is small, the amount of air supplied is reduced. It is preferable to reduce the amount of stirring.

Further, the operation of the stirring blade 81 can be an intermittent operation in which the rotation and the stop are repeated. That is, for example, the stirring blade can be rotated by intermittent operation that repeats rotation for 2 to 6 seconds and stop for 1 to 3 seconds. can do. 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.

In the recycled pulp-containing liquid stored in the storage tank 85, printing components such as toner components adhere to the generated bubbles and float near the liquid surface, and become a rotation center as the stirring blades 81 are stirred. The foam 87 containing this printing component gathers and rotates at the center of the surface of the pulp-containing liquid. The foam 87 floating in the center of the liquid surface always floats near the liquid surface even when the amount of the recycled pulp-containing liquid stored in the storage unit 8 decreases, and finally contains all recycled pulp. The liquid remains in the storage tank 85 until it is taken out from the storage tank 85. As a result, when the water level of the recycled pulp-containing liquid becomes a predetermined amount or less, it flows into the pipe 89 at a time and is transferred to the subsequent stage. Therefore, at this time, since the recycled pulp-containing liquid having a very high concentration of the printing component is transferred to the deinking section 2 and the papermaking section 3, the deinking conditions are significantly deteriorated, and the quality of the recycled paper obtained by papermaking is reduced. .

Therefore, when the regenerated pulp-containing liquid is stirred by the stirring blade 81, the foam 87 containing printing components such as ink components and toner components floating at the center of the liquid surface, which is the rotation center of the regenerated pulp-containing liquid, is removed. 88, and the amount of printing components mixed in the recycled pulp-containing liquid was reduced. Thereby, the deinking processing efficiency in the deinking part 2 can be improved, and the whiteness of the recycled paper obtained by papermaking can be improved.

In the dilution processing unit 86, the diluted liquid flowing through the pipe 93 is caused to flow into the regenerated pulp-containing liquid flowing through the pipe 89 to perform a dilution process. The dilution in the dilution processing unit 86 is a predetermined recycled pulp concentration that is lower than the first concentration in the recycled pulp-containing liquid and is suitable for the deinking process in the deinking unit 2. Up to the second concentration. When the deinking process in the deinking unit 2 is omitted, the deinking process is performed up to a predetermined second concentration that is a predetermined recycled pulp concentration suitable for papermaking in the papermaking unit 3. The flow rate of the diluent in the pipe 93 is adjusted with respect to the flow rate of the recycled pulp-containing liquid in the pipe 89 so that the predetermined second concentration is obtained.

That is, for example, from the state in which the concentration of the regenerated pulp in the regenerated pulp-containing liquid stored in the storage unit 8 is about 1.0 to 5.0% by weight which is the first concentration, the dilution processing unit 86 performs continuous dilution. And a recycled pulp concentration lower than the first concentration and suitable for deinking and papermaking is about 0.1 wt% to 3.0 wt%, more preferably about 0.3 wt% to 2.0 wt% Dilute to

The dilution in the dilution processing unit 86 may be performed continuously without interruption, or may be performed intermittently. In the case of performing intermittently, after the dilution liquid is allowed to flow from the pipe 93 at a predetermined flow rate for a predetermined time into the recycled pulp-containing liquid flowing in the pipe 89, the supply of the dilution liquid is temporarily interrupted, and then interrupted. This is performed by a method of restarting the dilution process by causing the diluent to flow in at a flow rate that is the same as the previous flow rate or a flow rate different from the flow rate before the 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 is set according to the result of the recycled pulp concentration measured for the recycled pulp-containing liquid produced by the dilution before the interruption. Fine adjustment is possible.

Thus, while the density | concentration of the regenerated pulp in the regenerated pulp containing liquid is diluted to the medium 1st density | concentration in the stirring tank 181, it is lower than the 1st density | concentration in the dilution process part 86, and is suitable for deinking or papermaking By diluting to the 2nd density | concentration of this, the reproduction | regeneration pulp containing liquid is divided into multiple times, and it is made to dilute in steps.

Moreover, in the dilution process part 86, since the dilution liquid which distribute | circulates the inside of the piping 93 is poured into the regenerated pulp containing liquid which distribute | circulates the inside of the piping 89, continuous dilution is performed, Therefore There is no need for a huge tank and stirring means for storage. Further, when white water in the white water tank 52 is used as a diluent, the white water generated by papermaking in the paper making unit 3 is circulated and used as the diluent, so that 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 regenerated pulp-containing liquid diluted to a concentration suitable for deinking by the dilution processing unit 86 is transferred to the deinking unit 2, and the deinking unit 2 flows into the regenerated pulp-containing liquid circulation tank 221 shown in FIG. The recycled pulp-containing liquid that has flowed in from the left or right opening of the partition wall 224 is sequentially circulated to the adjacent deinking chamber 225. In each deinking chamber 225, fine bubbles are blown from the bubble supply unit 226 into the recycled pulp-containing liquid in the presence of the deinking agent, and toner particles are generated 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 recycled pulp-containing liquid in the recycled pulp circulation tank 221.

The hydrophilic fibers sequentially flow through the deinking chamber 225 together with water. In this way, deinking is performed to remove toner components and the like from the recycled pulp-containing liquid. At this time, the temperature sensor 227 detects the temperature of the regenerated pulp-containing liquid, and the heater 228 performs temperature control to heat the regenerated pulp-containing liquid so as to maintain a predetermined temperature.

After introducing the recycled pulp-containing liquid into the deinking section 2, when a predetermined time has passed and the deinking process has progressed and bubbles have floated above the deinking chambers 225, the motor 222a is driven and the guide rail 222b is driven. 4A, the blade 222 is reciprocated in the vertical direction in FIG. 4A, and the bubbles floating above the recycled pulp-containing liquid circulation tank 221 are swept out into the bubble discharge tank 223. 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 discharging tank 223 is the deinking drain tank 51. Sent to.

The recycled pulp-containing liquid is circulated through all the deinking chambers 225 in the recycled pulp-containing liquid distribution tank 221, the recycled pulp-containing liquid is deinked, and the obtained recycled pulp-containing liquid containing the recycled pulp is discharged. It flows out from the section 229b and is sent to the paper making section 3 as shown in FIG.

In the paper making unit 3, as shown in FIG. 5, a recycled pulp-containing liquid containing recycled pulp is uniformly supplied to the guide member 31b on the mesh belt 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 flowing down below the mesh belt 323 is received by the water receiving part 325 and sent from the water receiving part 325 to the white water tank 52.

When the wet paper 64 on the mesh belt 323 reaches the end of the forward path, it is transferred to the water absorption belt 332a on the upper side of the dewatering unit 33. Thereafter, the water is sandwiched between the lower water-absorbing belt 332b and dehydrated by absorbing moisture contained in the wet paper 64 to the water-absorbing belts 332a and 332b, and is further squeezed by the squeezing roller 334 and dehydrated.

The wet paper 64 dehydrated by the dehydrating unit 33 is sent to the dryer unit 34 and is sandwiched between a pair of upper and lower conveying belts 342 that travel. Then, the wet paper 64 is transported while being brought into contact with a plurality of drying rollers 343 heated by the heater 345 and maintained at a predetermined temperature, whereby the wet paper 64 is dried to obtain a recycled paper 65 before finishing.

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 411. 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.

Of the wastewater sent to the wastewater treatment unit 5 in each process, wastewater in the deinking wastewater tank 51 that is highly contaminated and difficult to be reused is subjected to a predetermined waste liquid treatment if necessary, and then used by the waste paper processing apparatus 100. Discharge outside. The white water in the white water tank 52, which has a low degree of contamination and can be reused, 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.

In the above embodiment, only one dilution processing unit 86 is provided, but two or more may be provided. The second density is the same as the density suitable for deinking or papermaking, but may be higher than the density suitable for deinking or papermaking. That is, when two or more dilution processing units 86 are provided, the dilution at the most upstream dilution processing unit is set to the second concentration, and the second concentration is set higher than the concentration suitable for deinking or papermaking. Adjust to a concentration suitable for deinking or papermaking at the downstream dilution section.

DESCRIPTION OF SYMBOLS 1 Recycled pulp part 3 Paper making part 6 Recycled paper raw material 7 Recycled paper 77 Pump 80 Stirring means 85 Storage tank 86 Dilution processing part 88 Removal part 100 Used paper regeneration processing apparatus 181 Stirrer tank 182 Water supply part

Claims (6)

A recycled pulp part that stirs the used paper raw material together with water supplied from the water supply part in a stirring tank to produce a recycled pulp-containing liquid;
A papermaking part for papermaking the recycled pulp-containing liquid produced in the recycled pulp part,
A pump that is disposed in the middle of a transfer path for sending the recycled pulp-containing liquid from the recycled pulp section to the papermaking section, and has the ability to transfer the recycled pulp-containing liquid having a predetermined recycled pulp concentration;
In a used paper recycling processing apparatus comprising a control unit for controlling the operation of each unit,
Provided with a diluent flow path for supplying a diluent to the recycled pulp-containing liquid flowing through the transfer path,
The diluting liquid flowing through the diluting liquid flow path is caused to flow into the regenerated pulp-containing liquid flowing through the transfer path, and the diluting processing section for diluting the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid to a predetermined concentration is transferred to the diluting section. In the downstream of the pump in the
After the production of the regenerated pulp-containing liquid in the regenerated pulp part, the control unit supplies water to the stirring tank from the water supply part, and the concentration of the regenerated pulp contained in the regenerated pulp-containing liquid stored in the stirring tank is transferred by the pump. Control to dilute to a predetermined first concentration where possible,
In the dilution processing unit, the concentration of the recycled pulp contained in the recycled pulp-containing liquid is controlled to be diluted to a predetermined second concentration that is lower than the first concentration and equal to or higher than the concentration of papermaking in the papermaking unit. Used paper recycling processor. The used paper recycling apparatus of Claim 1 provided with the storage tank which is provided between the pump and dilution process part in a transfer path | route, and stores the predetermined quantity of the recycled pulp containing liquid which flows in from the upstream of the said transfer path | route. . The used paper recycling apparatus according to claim 2, wherein the storage tank is provided with a removing unit that removes foams containing printing components floating on the liquid surface of the recycled pulp-containing liquid stored in the storage tank. The used paper recycling apparatus according to claim 2 or 3, wherein the storage tank is provided with a stirring means for stirring the recycled pulp-containing liquid stored in the storage tank. The used paper recycling apparatus according to claim 4, wherein the control unit controls to change the amount of stirring by the stirring means in accordance with the amount of the recycled pulp-containing liquid stored in the storage tank. Stir the used paper raw material with water supplied from the water supply unit in a stirring tank to produce a recycled pulp-containing liquid,
In the used paper recycling process for producing recycled paper by making paper in the papermaking section with the obtained recycled pulp-containing liquid,
After the production of the recycled pulp-containing liquid, water is supplied from the water supply unit to the stirring tank,
The concentration of the regenerated pulp contained in the regenerated pulp-containing liquid stored in the agitation tank is adjusted by a pump having a predetermined capacity for sending the regenerated pulp-containing liquid from the regenerated pulp section to the papermaking section. Dilute to a predetermined first concentration that allows transfer,
Distribute the recycled pulp-containing liquid after dilution through the transfer path from the recycled pulp section to the papermaking section by driving the pump;
In the dilution processing section provided on the downstream side of the pump in the transfer path, the dilute liquid flowing in the dilute flow path is introduced into the regenerated pulp-containing liquid flowing in the transfer path, and the concentration of the regenerated pulp in the regenerated pulp-containing liquid is adjusted. A used paper recycling method comprising diluting to a predetermined second density that is lower than the first density and greater than or equal to the density of papermaking in the papermaking section.

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