JP2013007134A - Waste paper recycling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste paper recycling device which can prevent stopping of the device, by increasing storge capacity of white water while achieving downsizing of the device.SOLUTION: A waste paper recycling device includes a white water tank part 70 and a control unit 1000. The white water tank part 70 has a circulation water path connecting from a tank of the tank part to a pulper part 10 and a storage tank part 20 in a treatment part to be supplied with water. The control unit 1000 performs white water conveyance control in an operation stop treatment mode, in which white water is conveyed through the circulation water path from the white water tank part 70 to the pulper part 10 in an empty state after a final pulper part suspension liquid delivery step for supplying a pulp suspension liquid from the pulper part 10 to the storage tank part 20, to store the white water in the pulper part 10 and increase free capacity in the tank of the white water tank part 70.

Description

  The present invention relates to a used paper recycling processing apparatus that can be installed in an office or the like where waste paper is generated to recycle the paper.

2. Description of the Related Art Conventionally, a papermaking method for recycling used paper such as used newspaper in a general papermaking factory includes processing steps of a used paper pulp process, a paper making process, and a finishing process.
In the waste paper pulp process, waste paper, which is the raw material in the pulper, is dissolved in water, and metal, film, adhesive resin, and printing ink (dye type, pigment type) that are foreign matters other than paper fibers using mechanical power and chemicals. ), Separating and removing the copy toner and the like, and then bleaching, dehydrating and drying to obtain waste paper pulp.

  In the paper making process, the product paper is processed through the wire part, press part, dryer part, calendar part, and coater part of the paper machine. In the wire part, the prepared (regenerated) pulp is placed on a paper making net (wire) and dehydrated to make paper, and in the press part, the moisture in the wet paper containing a large amount of moisture from the wire part is removed. In the dryer part, the paper is dried through a dryer heated with steam, in the calendar part, the paper surface is smoothed between the rolls, and in the coater part, the base paper is coated with paint.

  In the super calendar part of the finishing process, the micro unevenness of the paper surface coated by the coater part is smoothed to give gloss, and in the cutter and winder part, it is cut into a predetermined product size or wound on a roll.

  A small papermaking machine has a processing unit provided for each processing step, and a plurality of processing units constitute a used paper recycling processing system. This processing unit includes a pulper unit that disaggregates regenerated raw materials to prepare regenerated pulp, a storage tank unit that stores regenerated pulp, and a deinking unit that deinks regenerated pulp and prepares a deinked pulp suspension. , Paper making section for making wet paper from deinked pulp suspension, dewatering and drying section for dehydrating and drying wet paper, white water tank section for storing white water discharged from the paper making section, and waste water treatment tank section for treating waste water. is there. White water or waste water flows into the white water tank unit and the waste water treatment tank unit through the water receiving path from the water receiving target processing unit.

  Patent Document 1 describes a used paper recycling apparatus. This is a deinked pulp section in which a waste paper cut paper piece is disaggregated to prepare a regenerated pulp, a regenerated pulp section is bleached to prepare a deinked pulp suspension, and a deinked pulp section. A paper making part for making recycled paper by making pulp suspension, a finishing part for cutting the recycled paper prepared in the paper making part into a predetermined size, and a second recycled pulp part for returning surplus paper pieces generated in the finishing part to the recycled pulp Are integrally provided.

JP 2009-299231 A

  In a small paper machine, during normal operation, white water or waste water flows into the white water tank unit and the waste water treatment tank unit from the processing unit to be received through the water receiving route, and the white water in the white water tank unit is removed from the pulper unit and the drainage unit. Returned to Sumitomo and reused.

  However, at the end of the operation, when the final operation of the pulper unit is completed, white water is not returned to the pulper unit, and when the operation of the deinking unit is finished next, white water is not returned to the deinking unit, and the white water tank The amount of white water stored in the section gradually increases.

  By the way, in a small paper machine, in order to reduce the size of the apparatus, the waste water treatment apparatus and other mechanisms are configured in a small specification. For this reason, the wastewater treatment tank is also miniaturized, the wastewater storage capacity is small, the treatment capacity for treating wastewater is low, and the wastewater treatment takes time.

  For this reason, even if the storage amount of white water stored in the white water tank portion increases, the supply amount supplied from the white water tank portion to the wastewater treatment tank portion cannot be increased. Therefore, when the amount of inflow flowing into the white water tank part exceeds the wastewater treatment capacity, the amount of white water stored in the white water tank part gradually increases, and there is a risk that white water will eventually overflow from the white water tank part, The operation of the device must be stopped halfway.

However, increasing the tank capacities of the waste water treatment tank unit and the white water tank unit contradicts the problem of downsizing the apparatus.
SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems, and aims to provide a used paper recycling apparatus capable of preventing a situation where the apparatus is stopped by increasing the storage capacity of white water while realizing downsizing of the apparatus. To do.

  In order to solve the above-mentioned problems, the used paper recycling apparatus of the present invention includes a pulper unit, a storage tank unit, a paper making unit, and a white water tank unit that constitute a used paper recycling processing system, and a control that controls these processing units. In the used paper recycling system, the pulp suspension prepared in the pulper part flows sequentially to the storage tank part and the paper making part, and the white water discharged from the paper making part flows into the white water tank part. There is a circulating water path from the tank to the pulper unit and the storage tank unit, which are processing units to be supplied with water, and the control unit performs pulp suspension from the pulper unit to the storage tank unit as white water transfer control performed in the shutdown processing mode. The white water is transferred from the white water tank section through the circulating water path to the pulper section that has been emptied after the final pulper section suspension delivery process is completed, and the white water is stored in the pulper section. , Characterized in that to increase the free capacity of the tank of the white water tank.

  In the used paper recycling processing apparatus of the present invention, one of the processing units constituting the used paper recycling processing system includes a deinking unit, and the pulp suspension prepared in the pulper unit is sequentially supplied to the storage tank unit, the deinking unit, and the papermaking unit. As the white water transfer control performed in the operation stop processing mode, the control unit is empty after finishing the final storage tank unit suspension delivery process for supplying the pulp suspension from the storage tank unit to the deinking unit. The white water is transferred from the white water tank unit to the storage tank unit, the white water is stored in the storage tank unit, and the free space in the tank of the white water tank unit is increased.

  In the used paper recycling processing apparatus of the present invention, one of the processing units constituting the used paper recycling processing system includes a deinking unit, and the pulp suspension prepared in the pulper unit is sequentially supplied to the storage tank unit, the deinking unit, and the papermaking unit. As the white water transfer control performed in the operation stop processing mode, the control unit is empty after finishing the final storage tank unit suspension delivery process for supplying the pulp suspension from the storage tank unit to the deinking unit. The white water is transferred from the pulper unit to the storage tank unit, the white water is stored in the storage tank unit, and the free space in the pulper unit is increased.

  In the used paper recycling apparatus of the present invention, the control unit is in the operation stop processing mode, and the white water transfer control is performed on the condition that the pulper unit is empty and the white water storage amount of the white water tank unit has reached the upper limit water level. It is characterized by performing.

  In the used paper recycling processing apparatus of the present invention, the control unit interrupts the white water transfer control when the used paper recycling processing system stops in error during the white water transfer control in the operation stop processing mode, and the used paper recycling processing system operates after the error is released. When restarting, the suspended white water transfer control is resumed.

  In the used paper recycling processing apparatus of the present invention, the used paper recycling processing system has a sub tank, the white water tank unit has a waste water discharge path from its own tank to the sub tank, and the control unit is in the operation stop processing mode, and the pulper unit The white water is transferred from the white water tank part to the sub tank through the waste water discharge route on the condition that the pulper part suspension delivery process is incomplete and the white water storage amount in the white water tank part has reached the upper limit water level. The white water transfer control is performed to increase the free space in the tank of the white water tank section.

  In the used paper recycling processing apparatus of the present invention, the used paper recycling processing system has a sub tank, the white water tank unit has a waste water discharge path from its own tank to the sub tank, and the control unit is in the operation stop processing mode, and the pulper unit As a condition, the amount of white water stored in the storage tank has reached the upper limit water level, the storage tank part suspension delivery process of the storage tank part has not been completed, and the amount of white water stored in the white water tank part has reached the upper limit water level. The white water is transferred from the white water tank part to the sub tank through the waste water discharge path, and white water transfer control is performed to increase the free space in the tank of the white water tank part.

In the used paper recycling processing apparatus of the present invention, one of the processing units constituting the used paper recycling processing system is provided with a drainage processing tank unit, and the wastewater processing tank unit has a sub tank.
In the used paper recycling apparatus of the present invention, the pulper unit and the storage tank unit have a wastewater discharge path from their own tank to the wastewater treatment tank unit, the control unit is in the shutdown processing mode, and the papermaking unit is the last papermaking step After finishing, white water transfer control for transferring white water from the pulper unit or storage tank unit to the waste water treatment tank unit is performed.

  As described above, according to the present invention, in the operation stop processing mode, the control unit is in an empty state after the last pulper unit suspension delivery process for supplying the pulp suspension from the pulper unit to the storage tank unit. White water is transferred from the white water tank unit to the pulper unit, the white water is stored in the pulper unit, and white water transfer control is performed to increase the free space in the tank of the white water tank unit, thereby reducing the size of the device while reducing the size of the device. It is possible to increase the storage capacity of the apparatus and prevent a situation in which the apparatus is stopped.

The block diagram which shows the used paper reproduction | regeneration processing apparatus in embodiment of this invention Schematic diagram showing a used paper recycling apparatus in the same embodiment Schematic showing the filtration dehydration apparatus in the same embodiment The top view which shows the filtration dehydration apparatus in the embodiment Schematic diagram showing the transfer operation procedure in the same embodiment Schematic diagram showing the transfer operation procedure in the same embodiment The schematic diagram which shows the transfer operation procedure in other embodiment of this invention. The block diagram which shows the used paper reproduction | regeneration processing apparatus in other embodiment of this invention The block diagram which shows the used paper reproduction | regeneration processing apparatus in other embodiment of this invention

Example 1
Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 and 2, the used paper recycling processing apparatus has a plurality of processing units constituting a used paper recycling processing system. The processing unit includes a pulper unit 10, a storage tank unit 20, a deinking unit 30, and a paper making unit. 40, a dehydration drying unit 50, a waste water treatment tank unit 60, and a white water tank unit 70, and includes a control unit 1000 that controls each processing unit. Each processing unit is provided with various sensor means such as a water level gauge, and the control unit 1000 controls each part while detecting the operation state of each processing unit by the sensor means.

  The pulper unit 10 separates a piece of paper to prepare a pulp suspension containing regenerated pulp, and includes a pulper tank 11 and a stirring device 12 provided inside the pulper tank 11. The pulper unit 10 is connected to the storage tank unit 20 via a first recycled pulp supply system 102 having a first tube pump 101.

  The storage tank unit 20 includes a storage tank 21 that stores the pulp suspension obtained in the pulper unit 10, and a stirring device 22 disposed inside the storage tank 21, and a second tube pump 201. 2 is connected to the deinking unit 30 via the recycled pulp supply system 202.

  The deinking section 30 deinks the pulp suspension sent from the storage tank section 20 and prepares the deinked pulp suspension. The deinking section 30 includes a deinking tank 31 having a meandering flow path, An air diffuser (not shown) that discharges a large number of bubbles from the bottom of the ink tank 31 and a bubble receiving tank 32 that surrounds the deinking tank 31 are provided. The deinking unit 30 is connected to the paper making unit 40 via a third recycled pulp supply system 302 having a third tube pump 301.

  The paper making unit 40 makes wet paper from the deinked pulp suspension, and includes a paper making wire 42 composed of a mesh belt wound around a plurality of rollers 41, and a deinked pulp suspension. A head box 43 for supplying the liquid onto the papermaking wire 42 is provided.

  The dehydrating and drying unit 50 includes a dehydrating unit 51 that dehydrates the wet paper and a drying unit 55 that dries the dehydrated wet paper. The dewatering unit 51 includes a felt water absorbing belt 53 wound around a plurality of rollers 52. The wet paper is transferred from the paper making wire 42 to the water absorbing belt 53, and the water absorbing belt 53 absorbs and dehydrates the wet paper. The drying unit 55 includes a drying roller 56 having a built-in heating device and a metal conveying belt 58 wound around a plurality of rollers 57.

  The waste water treatment tank unit 60 processes the deinking waste liquid flowing from the deinking unit 30, and includes a filtration dehydration device 61, a filtration treatment device 62, a waste water circulation tank 63, and a waste bin 64.

The filter dehydrator 61 removes fibers and toner with a filter (mesh belt), and a deinking waste liquid system 303 is connected to the foam receiving tank 32. Details thereof will be described later.
The filtration processing device 62 includes a flocculation process step, neutralizes by adding chemicals, and treats the water quality so that it can be drained to the sewage pipes of public sewage. A coagulation stirrer 66 is provided.

  The rotation speed of the stirring blades of the agglomeration stirrer 66 is set to such an extent that the drainage is not bubbled, that is, to the extent that cavitation does not occur. The stirring blade is provided near the water surface, and as a result, the precipitate is not entangled with the stirring blade.

  The agglomeration treatment tank 65 is connected to the filtration dehydrator 61 via an agglomeration waste liquid supply system 652 having an electric ball valve 651, and an agglomeration treatment discharge system 654 having an agglomeration treatment discharge valve 653 is connected to the agglomeration treatment tank 65. Yes.

  This agglomeration treatment discharge system 654 is a route for draining to the outside, but in the case of a device that does not have a drainage route to the outside, the water is circulated in the device and used when water is insufficient. Supply. When it is necessary to drain water to prevent water decay when the device is not used for a long period of time, it can be dealt with by sucking out water from the outside with a pump or the like.

  The wastewater treatment tank unit 60 includes a first drainage return system 600 that forms a circulation water path from a drainage circulation tank 63 that is a self tank to a deinking unit 30 that is a treatment target for water supply, and a treatment unit that is a target for receiving water. The deinking tank 31 of the deinking unit 30, the deinking drainage system 304 and the filtering drainage system 305 that are connected to the drainage circulation tank 63, which is its own tank, from the filtration dehydrator 61 are connected to each other. The ink drainage system 304 has a deinking drainage valve 306.

  The first drainage return system 600 has a drainage pump 602 and a drainage first valve 603, the tip is connected to the shower head 307 of the deinking unit 30, and from the first drainage return system 600 downstream of the drainage pump 602. A branched second drainage return system 601 is connected to the filtration apparatus 62 via a drainage second valve 604. The first drainage return system 600 has a drainage return system 605 branched from the first drainage return system 600 downstream of the drainage pump 602 and connected to the drainage circulation tank 63 via the drainage third valve 606 as a return water path. A wire cleaning water system 607 branched from the drain return system 605 on the upstream side of the third drain valve 606 is connected to the filtration dehydrator 61 via the fourth drain valve 608. The wire cleaning water system 607 supplies cleaning water for the mesh belt 612 described later.

  The filtration apparatus 62 has a flocculant tank 660 for storing the flocculant, and the flocculant tank 660 is connected to the flocculant treatment tank 65 via a flocculant supply system 662 having a flocculant supply pump 661, and the second A turbidity measuring device 663 such as a permeation sensor interposed in the drainage return system 601 is connected to the coagulant supply pump 661 via the control unit 1000.

  The white water tank unit 70 includes a first white water return system 711 and a second white water return system 712 that form a circulating water path from the white water tank 701 as its own tank to the pulper unit 10 and the deinking unit 30 as processing units to be supplied with water. Are connected to each other to form a water receiving path from the paper making unit 40 and the dehydrating / drying unit 50, which are water receiving target processing units, to the white water tank 701, which is its own tank, and a first white water drainage system 401 that collects by natural fall A second white water drainage system 501 is connected.

  The first white water return system 711 includes a white water first pump 713 and a white water first valve 714, and a first white water return system 715 branched on the downstream side of the white water first pump 713 returns via the white water second valve 716. The water path is connected to the white water tank 701.

  The second white water return system 712 that supplies the diluted water 717 to the second recycled pulp supply system 202 includes a white water second pump 718 and a white water third valve 719, and the second recycled pulp is downstream of the second tube pump 201. A second white water return system 720 that is connected to the supply system 202 and branches downstream from the white water second pump 718 is connected to the white water tank 701 via a white water fourth valve 721 as a return water path, and the white water second pump. A third white water return system 722 that branches on the downstream side of 718 is connected to the deinking unit 30 via the white water fifth valve 723.

  A water supply system 80 for supplying clean water is downstream of the main valve 81, a pulper water supply system 801 connected to the pulper unit 10, a papermaking unit water supply system 802 connected to the papermaking unit 40, and a dehydration connected to the dehydration drying unit 50. Branching to the drying unit water supply system 803, the pulper water supply system 801 further branches to a storage tank water supply system 804 connected to the storage tank unit 20.

  The pulper water supply system 801 has a first water supply valve 805 and a second water supply valve 806 to supply disaggregation water and maintenance water. The storage tank water supply system 804 is provided between the first valve 805 and the second valve 806. Branching from the pulper water supply system 801 has a third water supply valve 807 to supply maintenance water, and the papermaking unit water supply system 802 has a fourth water supply valve 808 to supply water for cleaning the papermaking wire 42. The dehydrating and drying unit water supply system 803 has a fifth water supply valve 809 and supplies water for acclimation and cleaning of the water absorption belt 53. A first white water return system 711 is connected to the pulper water supply system 801 between a first water supply valve 805 and a second water supply valve 806 via a white water first valve 714.

  The overflow detection tank 91 is connected to a pulper overflow system 911 of the pulper tank 11, a storage tank overflow system 912 of the storage tank 21, and a filtration processing device overflow system 913 of the filtration processing device 62.

  The pulper unit 10, the storage tank unit 20, and the white water tank unit 70 have the following configuration as a wastewater discharge system. The pulper unit 10 is connected to the filtration and dehydration device 61 of the wastewater treatment tank unit 60 via a first wastewater discharge system 110. The first wastewater discharge system 110 includes a wastewater discharge first valve 111 and a wastewater discharge first pump 112. Have. The storage tank unit 20 is connected between the wastewater discharge first valve 111 of the first wastewater discharge system 110 and the wastewater discharge first pump 112 via the second wastewater discharge system 210, and the second wastewater discharge system 210 is It has a wastewater discharge second valve 211. The white water tank unit 70 is connected to the downstream side of the first waste water discharge first pump 112 of the first waste water discharge system 110 via the third waste water discharge system 730, and the third waste water discharge system 730 is connected to the second white water return system 712. It branches on the downstream side of the white water second pump 718 and has a waste water discharge third valve 731.

  As shown in FIG. 3 to FIG. 4, the filtration and dehydration device 61 disposed above the drainage circulation tank 63 includes an endless mesh belt 612 spanned by a plurality of rotating rollers 611. In the upper part, the deinking waste liquid supply unit 613 connected to the deinking waste liquid system 303 and the aggregation waste liquid supply system 652, the pressing roller 614 disposed to face one of the plurality of rotating rollers 611, and the pressing roller 614 are brought into contact with each other. The water that is in contact with the transfer roller 615, the scraper 616 that is in sliding contact with the outer peripheral surface of the transfer roller 615, and the rotating roller 611 that faces the pressing roller 614 at a predetermined pressure, and is absorbed by a water absorbing member (not shown) of the rotating roller 611 A squeezing roller 610 is provided.

  The pressing roller 614 is biased at both ends by a spring (not shown) toward the rotating roller 611, and even if it is a thick waste fiber layer that occurs in normal operation, the thin waste fiber that occurs during maintenance of the deinking tank 31 Even a layer can be reliably dehydrated. When the urging force by the spring does not act, the squeezing roller 614 cannot be retracted when the layer is a thick waste fiber layer, so that clogging may occur.

  A filter scraping unit 617 is provided above the mesh belt 612 and downstream of the deinking waste liquid supply unit 613 in the traveling direction of the mesh belt 612. The filter cake scraping part 617 contacts the upper surface of the mesh belt 612 and scrapes the filter cake by a predetermined amount, and scrapes the rotary shaft 618 and the two scrapers projecting from the outer peripheral surface of the rotary shaft 618. The blade 619 and a scraping drive unit 620 that rotationally drives the rotary shaft 618 are provided.

  The two scraping blades 619 are provided radially from the rotation shaft 618, and each scraping blade 619 is formed in a substantially rectangular thin plate shape and has a bent portion 621, the tip portion of which is made of PET, PP, PE, or the like. The scraper blades 619 come into contact with the upper surface of the mesh belt 612 at a predetermined rotational speed and contact pressure as it rotates, such as synthetic resin or a metal thin plate such as aluminum or stainless steel.

  The scraping blade 619 has a bent portion 621 so that the tip edge line is arranged at a twisted position with respect to the axis of the rotation shaft 618. Thus, by providing an angle between the leading edge line of the scraping blade 619 and the axis of the rotation shaft 618, the scraping blade 619 does not contact the mesh belt 612 at a time, and the scraping blade 619 It abuts on the mesh belt 612 on one end side, and then gradually abuts on the mesh belt 612 toward the other end side. As a result, the rubbing sound between the scraping blades 619 and the mesh belt 612 is reduced, and the scraping blades 619 that are bent due to the contact with the mesh belt 612 gradually move away from the mesh belt 612, and the scraping blades 619. Since bending is not released at a stretch, water splashing can be suppressed.

  The mesh belt 612 has a mesh capable of filtering waste paper pulp contained in the deinking waste liquid, the mesh is in the range of 10 mesh to 50 mesh, and preferably 20 mesh to 30 mesh. By making the mesh 10 mesh or more, it is possible to reduce the amount of used paper pulp that passes through the mesh, and by making it 50 mesh or less it is difficult for clogging of the mesh due to waste paper pulp and the like to improve filtration efficiency. it can.

  The squeezing roller 614 sandwiches the mesh belt 612 between the rotating rollers 611 facing each other, filters the deinking waste liquid with the mesh belt 612, and squeezes the residue remaining on the mesh belt 612. The drainage produced by the pressing is absorbed by a water absorbing member (not shown) of the rotating roller 611 facing the pressing roller 614. The wastewater absorbed by the water absorbing member is squeezed out of the water absorbing member under the pressing force of the squeezing roller 610 and flows into the drainage circulation tank 63 through the filtered drainage system 305. The outer peripheral surface of the squeezing roller 614 has a smooth shape with less irregularities than the surface of the mesh belt 612, so that the filter cake is transferred from the mesh belt 612 to the squeezing roller 614 when the filter cake on the mesh belt 612 is squeezed. To do.

Then, the filter cake transferred to the pressing roller 614 is further transferred to the transfer roller 615, and the filter cake is peeled off from the transfer roller 615 by the scraper 616 and discharged to the trash box 64.
During maintenance of the deinking tank 31, the amount of wastewater flowing into the filtration and dehydrating device 61 through the deinking waste liquid system 303 is increased, so that the conveying speed of the mesh belt 612 is made faster than normal and the processing capacity is improved.

  The control unit 1000 controls each processing unit of the pulper unit 10, the storage tank unit 20, the deinking unit 30, the paper making unit 40, the dehydration drying unit 50, the wastewater treatment tank unit 60, and the white water tank unit 70 in the normal operation mode. The operation control of each unit is performed while detecting the operation state of each processing unit by various sensor means such as a water level gauge of each processing unit.

  In the pulper unit 10, the paper pieces are disaggregated to prepare a pulp suspension containing regenerated pulp, and the pulp suspension is supplied to the storage tank unit 20 through the first regenerated pulp supply system 102 by the first tube pump. The storage tank unit 20 supplies the pulp suspension stored in the storage tank 21 to the deinking unit 30 through the second recycled pulp supply system 202 by the second tube pump 201 while stirring the pulp suspension with the stirring device 22.

  In the deinking section 30, the pulp suspension is deinked in a deinking tank 31 having a meandering flow path, a deinked pulp suspension is prepared, and the deinked pulp suspension is added to the third tube. The paper is supplied to the paper making unit 40 through the third recycled pulp supply system 302 by the pump 301.

  In the paper making unit 40, the pulp suspension deinked from the head box 43 is supplied onto the paper making wire 42 to make wet paper. The dehydrating unit 51 of the dehydrating and drying unit 50 transfers wet paper from the paper making wire 42 to the water absorbing belt 53 to absorb and dehydrate, and the drying unit 55 transfers wet paper from the water absorbing belt 53 to the conveying belt 58 to heat the drying roller 56. Dry on equipment.

  In the wastewater treatment tank unit 60, fibers, ink, and toner in the deinking waste liquid flowing from the deinking unit 30 are removed by the mesh belt 612 of the filtration dehydrating device 61, and the aggregation processing is performed by the filtration processing device 62. The coagulation waste liquid in the coagulation treatment tank 65 is supplied to the filtration dehydrator 61 through the coagulation waste liquid supply system 652.

  In the wastewater treatment tank 60, the deinking waste liquid flows from the deinking tank 31 through the deinking drainage system 304 into the drainage circulation tank 63, and the filtered wastewater flows from the filtration dehydrator 61 through the filtering drainage system 305. Further, the waste water is supplied from the waste water circulation tank 63 to the shower head 307 of the deinking unit 30 through the first waste water return system 600 or the waste water is supplied to the filtration device 62 through the second waste water return system 601.

  A part of the drainage returns to the drainage circulation tank 63 through the drainage return system 605, and the return water flowing into the tank stirs the drainage in the tank and prevents the precipitation of the fibers. Since the water flow of the return water flowing into the tank depends on the discharge pressure of the drainage pump 602, a reliable stirring force can be realized. Moreover, stirring can be performed at any time by opening and closing the drainage third valve 606.

  The filtration processing device 62 detects the turbidity of the wastewater flowing into the flocculation treatment tank 65 by the turbidity measuring device 663 and controls the flocculant supply pump 661 according to the detected turbidity of the wastewater from the flocculant tank 660. The amount of the flocculant supplied to the flocculation treatment tank 65 is adjusted. The flocculant is added in a state where the waste water is stirred by the flocculent stirring device 66 to advance the flocculence reaction. Thereafter, the agglomeration stirrer 66 is reversely rotated for a certain period of time and then stopped to precipitate the agglomerated dust (fibers).

  In the white water tank unit 70, white water flows from the paper making unit 40 through the first white water drainage system 401, and white water flows from the dehydration drying unit 50 through the second white water drainage system 501. Further, white water is supplied from the white water tank 701 to the pulper unit 10 through the first white water return system 711, and white water is supplied to the second regenerated pulp supply system 202 or the deinking unit 30 through the second white water return system 712.

  A part of the white water returns to the white water tank 701 through the first white water return system 715 and the second white water return system 720, and the return water flowing into the tank stirs the waste water in the tank and prevents the precipitation of fibers. . Since the water flow of the return water flowing into the tank depends on the discharge pressures of the white water first pump 713 and the white water second pump 718, a reliable stirring force can be realized. Moreover, stirring can be performed at any time by opening and closing the white water second valve 716 and the white water fourth valve 721.

  In the above-described embodiment, the first white water return system and the second white water return system are provided as the white water return water path. However, only one of the white water return systems may be provided. In the above-described embodiment, the drainage return system 605 has the drainage third valve 606, the first whitewater return system 715 has the whitewater second valve 716, and the second whitewater return system 720 has the whitewater fourth valve 721. However, it is not always necessary to provide a valve in each return system. When each return system is not provided with a valve, the return water flows into the tank through each return system only when the drain pump 602, the white water first pump 713, and the white water second pump 718 of each return system are operated. When the pump 602, the white water first pump 713, and the white water second pump 718 are not operated, the return water does not flow into the tank.

  In each return system, it is preferable that an inlet of return water in each tank is opened downward or sideways in the vicinity of the bottom surface of the tank. When the inlet is provided downward, the return water that has flowed first hits the bottom surface of the tank, then flows sideways, that is, near the bottom surface of the tank along the bottom surface, and the return water that flows near the bottom surface of the tank hits the side surface of the tank. The flow changes upward, and then the return water changes sideways near the surface of the water, and finally the return water changes downward toward the inlet, creating a convection swirling up and down in the tank.

  When the inflow port is provided sideways, the returned return water flows in the vicinity of the tank bottom surface along the tank bottom surface, first hits the tank side surface, and then changes the flow upward along the tank side surface. After that, convection flowing along the tank shape is generated in the same manner as when the inflow port is provided downward.

  Thus, by providing the inflow port downward or sideways in the vicinity of the bottom surface of the tank, convection can be generated and the waste water in the tank can be agitated. Although it is possible to provide the return water inlet upward in the vicinity of the bottom of the tank, if the discharge pressure of the return water flowing in is strong, there is a risk that it will be ejected higher than the water surface. Such considerations are necessary.

When finishing the used paper recycling process, the control unit 1000 shifts from the normal operation mode to the operation stop process mode. This is due to the following reason.
That is, when the amount of inflow flowing into the white water tank unit 70 exceeds the waste water treatment capacity of the waste water treatment tank unit 60, the amount of white water stored in the white water tank unit 70 gradually increases, and finally the white water tank unit 70. There is a risk that white water overflows from the water, and the operation of the apparatus must be stopped halfway.

For this reason, in the operation stop processing mode, the control unit 1000 performs the following control.
As shown to Fig.5 (a), a pulper part suspension delivery process and a storage tank part suspension delivery process are performed. In the pulper part suspension delivery process, the pulp suspension is supplied from the pulper part 10 to the storage tank part 20 through the first recycled pulp supply system 102 by the first tube pump, and in the storage tank part suspension delivery process, The pulp suspension stored in the storage tank 21 is supplied to the deinking unit 30 through the second recycled pulp supply system 202 by the second tube pump 201 while stirring with the stirring device 22, and the deinked pulp suspension is removed. The black water is supplied from the ink section 30 to the paper making section 40 through the third recycled pulp supply system 302 by the third tube pump 301, and white water flows into the white water tank section 70.

  And as shown in FIG.5 (b), when the last pulper part suspension delivery process is completed, the pulper tank 11 of the pulper part 10 will be in an empty state. Here, the last pulper part suspension delivery process is the case where the number of processed recycled paper sheets and the processing time set by the user are finished and the next process is not necessary, or the pulp suspension preparation process of a predetermined number of times. This is the final pulper part suspension delivery step in the case of entering the cleaning mode in which the entire apparatus is washed after the pulper part suspension delivery step.

  Next, the control unit 1000 confirms that the pulper tank 11 is empty as shown in FIG. 5B, or that the pulper tank 11 is empty as shown in FIG. 5C. The white water transfer control is performed on the condition that the white water storage amount in the white water tank 701 has reached the upper limit water level.

  In the white water transfer control, as shown in FIG. 5 (d), the white water tank 701 of the white water tank unit 70 circulates in the pulper tank 11 of the pulper unit 10 that has been emptied after the final pulper unit suspension delivery process. The white water is transferred through the first white water return system 711 forming the water path, the white water is stored in the pulper unit 10, and the free capacity of the white water tank 701 in the white water tank unit 70 is increased.

Next, as shown in FIG.5 (e), when the last storage tank part suspension delivery process is completed, the storage tank 21 of the storage tank part 20 will be in an empty state.
As shown in FIG. 6 (f), the control unit 1000 stores white water from the white water tank 701 in the storage tank 21 of the storage tank unit 20 that has become empty after the last storage tank unit suspension delivery process. The white water is transferred through the tank water supply system 804, and white water is stored in the storage tank unit 20, and white water transfer control for increasing the free capacity of the white water tank 701 in the white water tank unit 70 is performed.

  In this white water transfer control, as another form, the first recycled pulp supply system 102 is not transferred directly from the white water tank 701 to the storage tank unit 20 but transferred to the storage tank 21 of the storage tank unit 20 that has become empty. It is also possible to transfer white water from the pulper unit 10 and store the white water in the storage tank unit 20, and also in this form, the free capacity of the pulper unit 10 can be increased.

  As shown in FIG. 6G, the white water transfer control is performed until all the deinked pulp suspension in the deinking tank 31 is supplied to the papermaking unit 40 and the operation of the papermaking unit 40 is completed. Also, the control unit 1000 interrupts the white water transfer control when the used paper recycling processing system stops in error during the white water transfer control in the operation stop processing mode, and when the used paper recycling processing system restarts after the error is released. The suspended white water transfer control is resumed.

  When the operation of the paper making unit 40 is completed, the control unit 1000 passes the first wastewater discharge system 110, the second wastewater discharge system 210, and the third wastewater discharge system 730 as shown in FIG. 6 (h). 10 or white water transfer control for transferring white water from the storage tank unit 20 or the white water tank unit 70 to the wastewater treatment tank unit 60.

The control unit 1000 performs the following control using the wastewater treatment tank unit 60 in the used paper recycling system as a sub tank.
That is, as shown in FIG. 6 (i), the control unit 1000 is in the operation stop processing mode, and the pulper unit suspension delivery process of the pulper unit 10 is in an incomplete state, and the whitewater storage of the whitewater tank unit 70 is performed. White water transfer that increases white space in the tank of the white water tank unit 70 by transferring white water through the third waste water discharge system 730 from the white water tank unit 70 to the waste water treatment tank unit 60 on condition that the amount reaches the upper limit water level. Take control.

Alternatively, as shown in FIG. 6 (j), the control unit 1000 is in the operation stop processing mode, the white water storage amount of the pulper unit 10 has reached the upper limit water level, and the storage tank unit suspension delivery of the storage tank unit 20 White water is transferred from the white water tank unit 70 to the wastewater treatment tank unit 60 through the third wastewater discharge system 730 on the condition that the process is incomplete and that the amount of white water stored in the white water tank unit 70 has reached the upper limit water level. Then, white water transfer control for increasing the free capacity in the tank of the white water tank unit 70 is performed. The sub tank may be provided separately from the waste water treatment tank unit 60.
Example 2
In the above-described embodiment, the deinking unit 30 deinks the pulp suspension sent from the storage tank unit 20 to prepare the deinked pulp suspension. However, it is also possible to make paper without deinking the pulp suspension.

In this case, in the configuration of FIG. 1, the deinking unit 30 and the components related to the deinking unit 30 are omitted, and the configuration shown in FIG.
In this configuration, in the storage tank section suspension delivery step, the paper making section 40 is passed through the second recycled pulp supply system 202 by the second tube pump 201 while stirring the pulp suspension stored in the storage tank 21 with the stirring device 22. To supply.

In the operation stop processing mode, the control unit 1000 performs the following control.
FIG. 7 (k) shows a pulp suspension storage state in the pulper unit 10 and the storage tank unit 20 during the final suspension preparation, and a white water storage state in the white water tank unit 70. From this state, as shown in FIG. 7L, a pulper part suspension delivery process and a storage tank part suspension delivery process are performed. In the pulper part suspension delivery process, the pulp suspension is supplied from the pulper part 10 to the storage tank part 20 through the first recycled pulp supply system 102 by the first tube pump, and in the storage tank part suspension delivery process, While stirring the pulp suspension stored in the storage tank 21 with the agitator 22, the second tube pump 201 supplies the pulp suspension 40 to the paper making section 40 through the second recycled pulp supply system 202, and white water is supplied to the white water tank section 70. Inflow.

And as shown in FIG.7 (m), when the last pulper part suspension delivery process is completed, the pulper tank 11 of the pulper part 10 will be in an empty state.
Next, the controller 1000 determines that the pulper tank 11 is empty as shown in FIG. 7 (m), or that the pulper tank 11 is empty as shown in FIG. 7 (n). The white water transfer control is performed on the condition that the white water storage amount in the white water tank 701 has reached the upper limit water level.

  In the white water transfer control, as shown in FIG. 7 (o), the white water tank 701 of the white water tank unit 70 circulates in the pulper tank 11 of the pulper unit 10 that has been emptied after the final pulper unit suspension delivery process. The white water is transferred through the first white water return system 711 forming the water path, the white water is stored in the pulper unit 10, and the free capacity of the white water tank 701 in the white water tank unit 70 is increased.

Next, as shown in FIG. 7 (p), when the last storage tank section suspension delivery process is completed, the storage tank 21 of the storage tank section 20 becomes empty.
When the control unit 1000 finishes the last storage tank unit suspension delivery process, the control unit 1000 discharges white water from the pulper unit 10 or the white water tank unit 70 through the first waste water discharge system 110 and the third waste water discharge system 730. White water transfer control is performed.
Example 3
Also, the waste water treatment tank unit 60 can be omitted. In this case, in the configuration of FIG. 1, the deinking unit 30 and the waste water treatment tank unit 60, and the deinking unit 30 and the waste water treatment tank unit 60 are related. 9 is omitted and the configuration is configured as shown in FIG.

  Also in this configuration, in the storage tank section suspension delivery step, the paper making section is passed through the second recycled pulp supply system 202 by the second tube pump 201 while stirring the pulp suspension stored in the storage tank 21 with the stirring device 22. 40.

  The operation in the operation stop processing mode in this configuration is the same as the operation in the state shown in FIGS. 7 (k) to (o) as compared with the previous embodiment 2, and is shown in FIG. 7 (p). The operation in the state is different. That is, in this embodiment, since the waste water treatment tank unit 60 is not provided, the white water transferred to the pulper tank 11 of the pulper unit 10 is not stored in the storage tank unit without controlling the white water transfer to the waste water treatment tank unit 60. The white water transfer control to 20 storage tanks 21 is performed, the operation is stopped by emptying the pulper tank 11 of the pulper unit 10.

  In the present embodiment, the pulper tank 11 of the pulper unit 10 is empty at the start of the next operation, so that the pulp suspension can be immediately prepared in the pulper unit 10.

DESCRIPTION OF SYMBOLS 10 Pulper part 11 Pulper tank 12 Stirrer 20 Storage tank part 21 Storage tank 22 Stirrer 30 Deinking part 31 Deinking tank 32 Foam receiving tank 40 Paper making part 41 Roller 42 Paper making wire 43 Head box 50 Dehydration drying part 51 Dehydration part 55 Drying section 52 Roller 53 Water absorption belt 56 Drying roller 57 Roller 58 Conveying belt 60 Wastewater treatment tank section 61 Filtration dewatering apparatus 62 Filtration processing apparatus 63 Wastewater circulation tank 64 Recycle bin 65 Coagulation treatment tank 66 Coagulation stirring apparatus 70 White water tank section 80 Water supply system 81 Original valve 91 Overflow detection tank 101 First tube pump 102 First recycled pulp supply system 110 First wastewater discharge system 111 Wastewater discharge first valve 112 Wastewater discharge first pump 201 Second tube pump 202 Second recycled pulp supply system 210 2 Wastewater discharge system 211 Wastewater Outlet second valve 301 Third tube pump 302 Third recycled pulp supply system 303 Deinking waste liquid system 304 Deinking drainage system 305 Filtration drainage system 306 Deinking drainage valve 307 Shower head 401 First white water drainage system 501 Second whitewater drainage system 600 first drainage return system 601 second drainage return system 602 drainage pump 603 drainage first valve 604 drainage second valve 605 drainage return system 606 drainage third valve 607 wire cleaning water system 608 drainage fourth valve 610 squeezing roller 611 rotation Roller 612 Mesh belt 613 Deinking waste liquid supply unit 614 Squeezing roller 615 Transfer roller 616 Scraper 617 Filtering scraping unit 618 Rotating shaft 619 Scraping blade 620 Scratching driving unit 651 Electric ball valve 652 Aggregation waste liquid supply system 653 Aggregation processing discharge valve 654 Coagulation treatment discharge system 660 Coagulant tank 661 Coagulant supply port Pump 662 Flocculant supply system 663 Turbidity measuring device 701 White water tank 711 First white water return system 712 Second white water return system 713 White water first pump 714 White water first valve 715 First white water return system 716 White water second valve 717 Diluted water 718 White water second pump 719 White water third valve 720 Second white water return system 721 White water fourth valve 722 Third white water return system 723 White water fifth valve 730 Third waste water discharge system 731 Waste water discharge third valve 801 Pulper water supply system 802 Papermaking Water supply system 803 Dehydration drying unit Water supply system 804 Storage tank water supply system 805 Water supply first valve 806 Water supply second valve 807 Water supply third valve 808 Water supply fourth valve 809 Water supply fifth valve 911 Pulper overflow system 912 Storage tank overflow system 913 Filtration Processor overflow system

Claims (9)

The pulp tank prepared in the pulper unit is equipped with a control unit that controls each processing unit of the pulper unit, storage tank unit, papermaking unit, white water tank unit that constitutes the used paper recycling processing system, and the storage tank unit In the used paper recycling system, the white water that flows sequentially to the paper making section and the white water discharged from the paper making section flows into the white water tank section.
The white water tank unit has a circulating water path from its own tank to the pulper unit and the storage tank unit which are the processing units to be supplied with water, and the control unit controls the storage tank from the pulper unit as white water transfer control performed in the operation stop processing mode. The white water is transferred from the white water tank section through the circulating water path to the pulper section that has been emptied after the last pulper section suspension delivery process to supply the pulp suspension to the section, and the white water is stored in the pulper section. A waste paper recycling apparatus for increasing the free space in the tank of the white water tank section.   One of the processing units constituting the used paper recycling system is equipped with a deinking unit, and the pulp suspension prepared in the pulper unit flows sequentially to the storage tank unit, the deinking unit, and the papermaking unit. As white water transfer control performed in the processing mode, the storage tank unit that has been empty after the last storage tank unit suspension delivery process for supplying pulp suspension from the storage tank unit to the deinking unit is transferred from the white water tank unit. 2. The used paper recycling apparatus according to claim 1, wherein white paper is transferred, the white water is stored in a storage tank section, and the free capacity in the tank of the white water tank section is increased.   One of the processing units constituting the used paper recycling system is equipped with a deinking unit, and the pulp suspension prepared in the pulper unit flows sequentially to the storage tank unit, the deinking unit, and the papermaking unit. As white water transfer control performed in the processing mode, white water is supplied from the pulper unit to the storage tank unit that is empty after the final storage tank unit suspension delivery process for supplying the pulp suspension from the storage tank unit to the deinking unit. 2. The used paper recycling apparatus according to claim 1, wherein white paper is stored in the storage tank and the free space in the pulper is increased.   The control unit, in the operation stop processing mode, performs white water transfer control on the condition that the pulper unit is in an empty state and the white water storage amount of the white water tank unit has reached an upper limit water level. 2. A used paper recycling apparatus according to 1.   In the operation stop processing mode, the control unit interrupts the white water transfer control if the used paper recycling system stops in error during the white water transfer control, and stops if the used paper recycling system restarts after the error is cleared. The used paper recycling apparatus according to any one of claims 1 to 4, wherein the white water transfer control is resumed.   The used paper recycling system has a sub-tank, the white water tank unit has a wastewater discharge path from its own tank to the sub-tank, and the control unit is in the operation stop processing mode, and the pulper unit suspension delivery process of the pulper unit On the condition that the white water storage amount in the white water tank section has reached the upper limit water level, the white water is transferred from the white water tank section to the sub tank through the waste water discharge route and the free space in the white water tank section is reached. The used paper recycling apparatus according to claim 1, wherein white water transfer control is performed to increase the amount of white paper.   The used paper recycling system has a sub-tank, the white water tank unit has a waste water discharge path from its own tank to the sub tank, and the control unit is in the shutdown processing mode, and the white water storage amount of the pulper unit reaches the upper limit water level. Waste water discharge from the white water tank unit to the sub-tank on the condition that the storage tank unit suspension delivery process of the storage tank unit is not completed and the white water storage amount of the white water tank unit has reached the upper limit water level The used paper recycling apparatus according to claim 2 or 3, wherein white water transfer control is performed to transfer white water through a path to increase a free space in a tank of the white water tank section.   8. A used paper recycling apparatus according to claim 6 or 7, wherein one of the processing units constituting the used paper recycling processing system includes a waste water treatment tank, and the waste water processing tank has a sub tank.   The pulper unit and storage tank unit have a wastewater discharge path from their own tank to the wastewater treatment tank unit, and the control unit is in the shutdown process mode, and after the papermaking unit has finished the last papermaking process, the pulper unit or storage tank The used paper recycling apparatus according to claim 8, wherein white water transfer control is performed to transfer white water from the tank section to the waste water treatment tank section.

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