JP5800596B2 - Waste paper recycling processor - Google Patents

Description

  The present invention relates to a used paper recycling apparatus, and is a technique related to a deinking process for separating a coloring component for printing from a pulp-containing liquid.

  As a technique related to the conventional deinking process, for example, there is a technique described in Patent Document 1. This has an air supply means for disposing a diffuser pipe penetrating the lower part of at least two treatment tanks, supplying compressed air into the diffuser pipe, and ejecting bubbles from the diffuser port, Is provided with a raw material inlet for introducing the waste paper into the processing tank and a raw material outlet for discharging the waste paper raw material liquid in the processing tank.

  In addition, the top of the treatment tank and the gas-liquid separation tank is a floss cup for discharging ink particles to the outside of the treatment tank and the gas-liquid separation tank. Floss (foam) overflowing from the surface of the waste paper raw material liquid introduced into the treatment tank and the gas-liquid separation tank over the floss soot is transmitted through the floss soot and discharged.

An antifoaming agent supply pipe having a downward nozzle for spraying an antifoaming agent such as water for defoaming froth (foam) is disposed immediately above the froth.
In Patent Document 2, a carriage that reciprocates above the liquid level in the tank of the deinking device is disposed, and a nozzle that injects an air flow is provided on the carriage, and the air flow is directed from the nozzle toward the end of the tank. The structure to inject is described.

JP 2002-275776 A JP 63-152491 A

  However, in the technique described in Patent Document 1, the foam may not be evenly dispersed but may overflow and the foam may not flow smoothly through the floss soot, and may flow over the floss soot and overflow to the outside of the floss soot. There is a case to put out.

  Moreover, in the technique described in Patent Document 2, the timing of operating the carriage becomes a problem. That is, even if the carriage is operated while jetting air flow from the nozzle toward the end of the tank in a state where there are few foams floating on the liquid level in the tank, it is only an inefficient operation. There was no way to detect the optimal timing to discharge the gas.

  The present invention solves the above-mentioned problems, and the used paper recycling process can scrape and discharge the foam generated on the liquid surface in the deinking tank at the time of deinking at the optimum timing when the foam is the largest. An object is to provide an apparatus.

In order to solve the above problems, a used paper recycling apparatus of the present invention includes a plurality of processing units constituting a used paper recycling processing system and a control unit that controls each processing unit, and performs deinking that forms one of the processing units. The deinking tank is installed only in the deinking tank responsible for the deinking process and the end of the deinking tank in one direction, and foam bubbles on the liquid surface in the deinking tank overflow from the bubble discharge port of the deinking tank. The incoming foam receiving part, the upper limit water level detecting part for detecting that the water level in the tank has reached the upper limit water level, and moving the movable blade in the one direction from the start end position to the end position to direct the foam to the foam receiving part And a blade part that moves the movable blade from the end position to the start position with the movable blade retracted above the foam , and the control unit detects that the water level in the tank has reached the upper limit water level. When detected, the blade part is controlled to push out the foam toward the foam receiving part. Has over de unit control function unit, deinking portion is provided only in one direction of the end portion of Datsusumiso toward the movable blade to wait at the end side of the extruding the foam to受泡unit, It has the defoaming solution injection part which injects the antifoaming solution which defoams the said foam.

  In the above configuration, the movable blade of the blade portion moves while maintaining a constant height during the foam extrusion operation. On the other hand, the foam on the liquid level in the deinking tank moves up and down as the liquid level fluctuates up and down. For this reason, when the water level in the tank is at the upper limit water level, the movable blade comes closest to the liquid level, the movable blade corresponds to the area including the lower end of the foam layer on the liquid level, and the movable blade scrapes off the foam. The amount of foam remaining on the liquid surface after removal is minimized.

The amount of foam generated in the deinking tank is maximized when the water level in the tank reaches the upper limit water level, that is, when a new pulp-containing liquid flows into the deinking tank. For this reason, when the water level in the tank reaches the upper limit water level, the foam can be scraped off and discharged at the optimal timing when the foam becomes the largest by pushing the foam toward the foam receiving portion with the movable blade. .
Also, when the foam collected by the movable blade is discharged to the foam receiving part, the foam is ejected to the foam receiving part by spraying an antifoaming solution toward the movable blade and washing away the foam adhering to the movable blade. All of the foam scraped up in the step can be discharged to the foam receiving part.

  In the used paper recycling apparatus of the present invention, the deinking unit includes a pulp-containing liquid control unit that controls the supply amount of the pulp-containing liquid before deinking supplied to the deinking tank, and the water level in the tank of the deinking tank is the lower limit water level. The lower limit water level detection unit that detects that the water level has reached the control unit, the control unit controls the pulp-containing liquid control unit, and detects the water level in the tank by the upper limit water level detection unit and the lower limit water level detection unit. It has the tank water level control function part hold | maintained between a minimum water level, It is characterized by the above-mentioned.

  In the above configuration, the pulp-containing liquid before deinking flows into the deinking tank, and the deinked pulp liquid after the deinking process flows out to the next step. In order to continuously supply the deinked pulp liquid from the deinking tank to the next process without interruption, it is necessary to supply the pulp-containing liquid before deinking while ensuring a liquid amount of a certain amount or more to the deinking tank. is there. For this reason, the pulp-containing liquid before deinking is intermittently supplied to the deinking tank and held between the upper limit water level detected by the upper limit water level detection unit and the lower limit water level detected by the lower limit water level detection unit. To do. Therefore, by using the upper limit water level detection unit for both the water level control and the movable blade operation control, it is possible to perform the foam scraping control by the movable blade in relation to the water level control in the deinking tank.

  As described above, according to the present invention, the foam generated on the liquid surface in the deinking tank at the time of deinking can be scraped off and discharged at the optimum timing when the foam becomes the largest.

1 is a block diagram showing a configuration of a used paper recycling processing apparatus according to a first embodiment of the present invention. The longitudinal cross-sectional view which shows the deinking processing apparatus with which the used paper reproduction | regeneration processing apparatus was equipped, and a movable blade is in a start position FIG. 3 is an XX arrow view in FIG. 2. It is a YY arrow line view in FIG. It is a top view of the same deinking processing apparatus. Same as above, enlarged sectional view of movable blade and moving device of deinking processing device The figure of the 2nd moving mechanism of the moving apparatus of a deinking processing apparatus similarly Same as above, cross-sectional view of position detecting device of moving device of deinking processing device The longitudinal cross-sectional view showing the deinking apparatus and the movable blade at the end position Same as above, an enlarged cross-sectional view showing the movable blade and the moving device of the deinking apparatus, with the movable blade positioned at the end position The figure of the 2nd moving mechanism of the moving apparatus of a deinking processing apparatus similarly Same as above, cross-sectional view of position detecting device of moving device of deinking processing device The figure which shows the movement path | route of the movable blade of a deinking processing apparatus similarly The longitudinal sectional view of the deinking drainage processing device of the same deinking processing device The top view of the deinking drainage processing device of the same deinking processing device Front view showing the movable blade of the deinking apparatus FIG. 2 is a block diagram showing a control unit of the used paper recycling processing apparatus Same as above, enlarged view of deinking equipment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 3 and FIG. 17, a used paper recycling apparatus 1 manufactures recycled paper 4 from a paper material obtained by chopping used used paper 2 (spent paper), and includes a plurality of used paper recycling processing systems. And a control unit 200 that controls each processing unit.

  Each processing unit was obtained with a pulper device 6 that disaggregates the shredded paper material to produce the pulp-containing liquid 5, a paper material supply device 8 that supplies the paper material to the pulper device 6, and the pulper device 6. A storage tank 9 that stores the pulp-containing liquid 5, a deinking device 10 that separates and removes coloring components for printing such as toner from the pulp-containing liquid 5 stored in the storage tank 9, and deinking in the deinking apparatus 10 A paper making device 12 for dehydrating the pulp-containing liquid 5 to produce wet paper, a wet paper dehydrating device 13 for dehydrating the wet paper, and a wet paper drying device 14 for drying the dehydrated wet paper to make recycled paper 4. A finishing device 15 that performs a finishing process on the recycled paper 4, a deinking drainage processing device 17 that processes the deinking drainage 16 discharged from the deinking device 10, a white water tank 18, and the like. A supply source 19 of clean water communicates with the tank 18.

  A pulp-containing liquid supply pump 201 that supplies the pulp-containing liquid 5 is provided between the storage tank 9 and the deinking apparatus 10, and a diluent supply pump 202 is provided between the white water tank 18 and the deinking apparatus 10. Yes, the diluent supply pump 202 communicates with the downstream side of the pulp-containing liquid supply pump 201, and the pulp-containing liquid supply pump 201 and the diluent supply pump 202 constitute a pulp-containing liquid control unit described later. A deinking pulp-containing liquid supply pump 203 is provided between the deinking apparatus 10 and the paper making apparatus 12. The deinking apparatus 10 and the deinking / draining apparatus 17 constitute a deinking apparatus 21 that forms a deinking section.

  As shown in FIGS. 2 and 3, the deinking apparatus 10 supplies air to the deinking tank 23, a foam discharging apparatus 25 that discharges the foam 24 from the bottom of the deinking tank 23, and the foam discharging apparatus 25. And an air supply device (air pump or the like). The deinking tank 23 is manufactured using a transparent material so that the inside can be seen from the outside, and has a pair of inclined portions 26a and 26b that are inclined so that the width of the upper portion is gradually reduced. At the upper end of the deinking tank 23 and above the inclined portions 26a and 26b, a quadrangular (an example of a polygon) opening 27 having four (an example of a plurality of sides) in plan view is formed. . On one side of the end portion in one direction C of the opening portion 27, a bubble overflow portion 29 is formed to allow the foam 24 to overflow from the inside of the deinking tank 23 to the outside of the tank.

  The deinking tank 23 is partitioned into a plurality of deinking chambers 31 by a plurality of partition walls 30. By forming the openings 32 in a part of the partition walls 30, all the deinking chambers 31 pass through the openings 32. Communicate. The deinking tank 23 has an inflow portion 33 for introducing the pulp-containing liquid 5 in the storage tank 9 into the deinking tank 23, and the pulp-containing liquid 5 in the deinking tank 23 in the head box of the papermaking apparatus 12. An outflow portion 34 for discharging is provided.

  The foam discharge device 25 is disposed at the bottom of the deinking tank 23 and is composed of a porous air stone having air permeability, and the upper surface is formed as a foam discharge surface. The deinking tank 23 is provided with a plurality of cleaning nozzles 35 (an example of a cleaning device) that sprays cleaning water 53 onto the foam discharge surface of the foam discharge device 25. Each cleaning nozzle 35 is provided for each deinking chamber 31, and a cleaning water supply pipe 36 that supplies the cleaning water 53 to each cleaning nozzle 35 and a valve 37 that opens and closes the cleaning water supply pipe 36 are provided. It has been. In addition, the front-end | tip of each washing nozzle 35 is located just above a bubble discharge | release surface.

  In addition, a deinking drainage processing device 17 is provided below the deinking tank 23. The deinking tank 23 is provided with a foam receiving part 38 that discharges the foam 24 that overflows the bubble overflowing part 29 to the outside of the deinking tank 23 to the deinking drainage processing device 17. The foam receiving part 38 is a rectangular tubular member having a rectangular upper end inlet 39 and lower end outlet 40 in a plan view, and a vertical (vertical) flow passage 41 extending from the upper end inlet 39 to the lower end outlet 40, A lower end outlet 40 is formed immediately below the upper end inlet 39. The upper end inlet 39 is adjacent to the bubble overflow portion 29 and opens over the length direction of the bubble overflow portion 29. 3 and 4, the length L1 of the upper end inlet 39, the length L2 of the lower end outlet 40, and the length L3 of the bubble overflow portion 29 are the same (or substantially the same).

  The flow passage 41 has an upper flow passage 41a whose width W decreases as it goes down from the upper end inlet 39, and a lower flow passage 41b whose width W is constant. The upper flow passage 41a has an upper inclined surface 41c formed by the inclined portion 26b of the deinking tank 23, and a lower inclined surface 41d formed below the inclined surface 41c and inclined in the same direction. Yes.

The outer peripheral edge of the opening portion 27 of the deinking tank 23 and the upper end inlet 39 of the foam receiving portion 38 is surrounded by a surrounding plate 43 formed in a square frame shape in plan view.
As shown in FIGS. 14 and 15, the deinking / drainage processing device 17 includes an endless rotatable mesh belt 57 stretched around a plurality of rotating rollers 55 a to 55 c, and at least one rotating roller. A compression roller 59 disposed opposite to the rotating roller 55b on the downstream side of the mesh belt 57. The mesh belt 57 is a mesh-like belt having water permeability, and is an example of a filtering member that filters the deinking drainage liquid 56 discharged from the lower end outlet 40 of the foam receiving portion 38. The traveling track of the mesh belt 57 includes an outward track 57a that travels from the upstream side to the downstream side, and a return track 57b that returns from the downstream side to the upstream side. The lower end outlet 40 of the bubble receiving portion 38 is located above the upstream end portion of the mesh belt 57 in the forward track 57a.

  The squeezing roller 59 sandwiches the mesh belt 57 between the rotating rollers 55 b facing each other, and the deinking waste liquid 16 is filtered by the mesh belt 57 so as to squeeze the filter cake remaining on the mesh belt 57. It is configured. The filter cake is configured to be transferred from the mesh belt 57 to the pressing roller 59 as the filter cake is squeezed on the mesh belt 57.

  Next to the squeezing roller 59, a transfer roller 58 that is in rolling contact with the squeezing roller 59 is provided, and the filter cake transferred to the squeezing roller 59 is further transferred. In the vicinity of the pressing roller 59, there is provided a scraper 60 that is in sliding contact with the outer peripheral surface of the pressing roller 59, peels off the filter cake transferred to the pressing roller 59, and sends it to the transfer roller 58. Further, in the vicinity of the transfer roller 58, a scraper 63 that slides on the outer peripheral surface of the transfer roller 58 and peels the filter cake transferred from the squeezing roller 59 to the transfer roller 58 from the transfer roller 58 is provided.

  The outer peripheral portion of the rotating roller 55b is composed of a water absorbing member 65 such as a sponge. In addition, a squeezing roller 64 is provided adjacent to the rotating roller 55b so as to make rolling contact with the rotating roller 55b with a predetermined pressure and squeeze the water absorbed by the water absorbing member 65.

  Above the mesh belt 57, a pair of guides 66 extending along the left and right width edges of the mesh belt 57 are provided. The upper surface of the mesh belt 57 is slidable on the lower side of the guide 66. Above the mesh belt 57 and between the lower end outlet 40 of the foam receiving portion 38 and the pressing roller 59, a filter scraping device 61 that scrapes the filter cake on the mesh belt 57 is provided. The filter scraping device 61 has a plurality of radial scraping blades 62 that are rotated by a rotation driving device, and the tips of the scraping blades 62 are in contact with the upper surface of the mesh belt 57.

Further, a filtrate tank 71 for storing filtrate generated by filtering the deinking drainage liquid 16 through the mesh belt 57 is installed below the return trajectory 57 b of the mesh belt 57.
Between the forward trajectory 57a and the return trajectory 57b of the mesh belt 57, first and second trays 67 and 68 for receiving the filtrate are provided. The first saucer 67 is inclined toward the second saucer 68, and the filtrate received by the first saucer 67 is configured to flow from the first saucer 67 to the second saucer 68.

  At both ends in the longitudinal direction of the second tray 68, a filtrate outlet 68a for discharging the filtrate in the second tray 68 to the filtrate tank 71 is formed. A third tray 69 for receiving the filtrate flowing down from the mesh belt 57 of the return track 57b and discharging it to the filtrate tank 71 is provided below the return track 57b on the downstream side.

  Next to the filtrate tank 71, a filter container 72 for containing the cake separated from the transfer roller 58 by the scraper 63 and a concentrated liquid (raw solution) defoamer 73 are injected into the filtrate tank 71. An antifoaming agent injection device 74 is provided.

  The antifoaming agent injection device 74 includes an antifoaming agent tank 75 that stores the antifoaming agent 73, an injection pipe 76 that injects the antifoaming agent 73 in the antifoaming agent tank 75 into the filtrate tank 71, and an injection And an injection pump 77 provided in the pipe 76 for use. By the operation of the injection pump 77, the antifoaming agent 73 in the antifoaming agent tank 75 is injected into the filtrate tank 71 through the injection pipe 76 and mixed with the filtrate in the filtrate tank 71 for dilution. Is done. Thus, the defoaming device 21 is provided with a defoaming device 45 that ejects a liquid obtained by diluting the antifoaming agent 73 with the filtrate as the defoaming solution 44.

  As shown in FIGS. 2 and 3, the defoaming device 45 includes a foam 24 overflowing the foam overflow portion 29 and an antifoam solution injection portion 46 for injecting the antifoam solution 44 to the movable blade 81 described below. And a supply pipe 47 for supplying the antifoam solution 44 in the filtrate tank 71 to the antifoam solution injection section 46, and a supply pump 48 provided in the supply pipe 47.

  As shown in FIG. 6, the defoaming solution injection section 46 has an injection pipe 46a provided inside the enclosure plate 43 and a plurality of injection nozzles 46b provided in the injection pipe 46a. A drive device (not shown) composed of a link or the like is configured to be rotatable in the vertical direction around the horizontal axis.

  A foam detection sensor 51 for detecting the amount of the discharged foam 24 is provided on the foam discharge path from the foam overflow part 29 of the deinking tank 23 through the foam receiving part 38 to the deinking drainage processing device 17. ing. As shown in FIGS. 14 and 15, the foam detection sensor 51 is provided in the deinking drainage processing device 17 and is discharged from the lower end outlet 40 of the foam receiving portion 38 onto the mesh belt 57 in the forward track 57a. The amount of the foam 24 is detected. That is, the foam detection sensor 51 includes a light projector 51a and a light receiver 51b that are opposed to each other in the belt width direction with the mesh belt 57 interposed therebetween, and is above the mesh belt 57 by a predetermined height and of the filter scraping device 61. Located downstream.

  A blade unit 80 is provided above the deinking tank 23. The blade portion 80 includes a movable blade 81 (movable member and foam collecting means) that collects the foam 24 overflowing from the opening 27 to the outside of the deinking tank 23 to the foam overflow portion 29 and pushes it to the upper end inlet 39 of the foam receiving portion 38. An example) and a moving device 82 for moving the movable blade 81 is provided. The shape of the movable blade 81 is not limited to this embodiment, and various shapes can be applied, and the foam receiving portion 38 can be provided around the deinking tank 23.

  Here, as shown in FIGS. 2, 3, and 9, the upper side on the bubble overflow portion 29 side is the end position B, and the other side 83 side of the opening 27 opposite to the bubble overflow portion 29 is on the side. Is defined as a start direction A, a direction from the start position A to the end position B is defined as one direction C, and a direction from the end position B to the start end position A is defined as a return direction D.

The moving device 82 includes a first moving mechanism 84 that reciprocates the movable blade 81 in one direction C and a return direction D, and a second moving mechanism 85 that moves the movable blade 81 up and down.
As shown in FIGS. 5 to 7, the first moving mechanism 84 includes a movable body 86 that can move in one direction C and a return direction D, a pair of slide mechanisms 87 a and 87 b that move the movable body 86, A drive unit 88 that operates the slide mechanisms 87 a and 87 b, an attachment member 89 that is held up and down by the movable body 86, and a holding mechanism 90 that holds the attachment member 89 on the movable body 86 are provided.

  Both slide mechanisms 87a and 87b are arranged to face each other in one direction C and in a direction E orthogonal to the return direction D, and one slide mechanism 87a has one rotatable pulley 91 (wheel) provided on the one direction C side. Body), the other rotatable pulley 92 (ring body) provided on the return direction D side, and an endless belt 93 (endless rotating body) wound between the pulleys 91 and 92. doing. The other slide mechanism 87b has the same configuration as the one slide mechanism 87a.

  The movable body 86 is provided between the belts 93, is supported by a pair of guide shafts 94, and is guided in one direction C and a return direction D. Both pulleys 91 are provided at both ends of one common rotating shaft 95, and both pulleys 92 are provided at both ends of the other common rotating shaft 96.

  The drive unit 88 includes a drive pulley 99 (drive wheel body) that is rotationally driven by a motor 98, a driven pulley 100 (driven wheel body) provided at one end of the other rotating shaft 96, and between the pulleys 99 and 100. It has a wound drive belt 101 (endless rotating body).

  The holding mechanism 90 includes a plurality of holding shafts 102 erected on the upper surface of the movable body 86 and a plurality of coil springs 103 (biasing means) that urge the mounting member 89 upward. The attachment member 89 has a horizontal plate portion 89a in which a plurality of through-holes 104 are formed, and a vertical plate portion 89b suspended from the end of the horizontal plate portion 89a. Each holding shaft 102 is inserted into each through hole 104 from below, and the coil spring 103 is provided between the upper surface of the movable body 86 and the lower surface of the horizontal plate portion 89 a of the mounting member 89. It is fitted. As a result, the attachment member 89 can move up and down along the holding shaft 102, is held on the movable body 86 via the coil spring 103, and is biased upward.

  The movable blade 81 is provided below the vertical plate portion 89b of the mounting member 89, and a seal member 204 made of rubber or the like is disposed around it. A stopper 105 is provided at the upper end of each holding shaft 102 to prevent the attachment member 89 from being pulled out above the holding shaft 102. Each stopper 105 is a disk-shaped member having a diameter larger than that of the through hole 104.

  The second moving mechanism 85 has a pair of guide rollers 107a and 107b facing each other in the direction E orthogonal to the one direction C and the return direction D, and the guide rollers 107a and 107b at the lowest pressing position F (see FIG. 7). ) And the uppermost retracted position G (see FIG. 11).

  As shown in FIGS. 5 to 7, the lifting device 108 includes a pair of rotating shafts 109 a and 109 b provided in parallel with the guide rollers 107 a and 107 b, and a plurality of arms 110 a provided on the rotating shafts 109 a and 109 b, 110b, a rotation driving device 111 that rotates both rotation shafts 109a and 109b in the same direction, and a position detection device 119 that detects the vertical position of both guide rollers 107a and 107b.

  One guide roller 107a is rotatably attached between the free ends of the pair of arms 110a, and the other guide roller 107b is rotatably attached between the free ends of the pair of arms 110b.

  The rotation driving device 111 includes a driving pulley 113 (driving wheel body) that is rotationally driven by a motor 112, a driven pulley 114 (driven wheel body) provided at one end of the other rotating shaft 109b, and between the pulleys 113 and 114. A drive belt 115 (endless rotating body) wound around, an interlocking pulley 116a, 116b provided at the other end of both rotating shafts 109a, 109b, and an interlocking belt 117 wound between both interlocking pulleys 116a, 116b. (Endless rotating body).

  As shown in FIGS. 8 and 12, the position detection device 119 includes a first photoelectric sensor 120 that detects that both guide rollers 107 a and 107 b are lowered to the pressed position F, and both guide rollers 107 a and 107 b are in a retracted position. It has the 2nd photoelectric sensor 121 which detects that it rose to G, and the detection board 122. The first and second photoelectric sensors 120 and 121 have projectors 120a and 121a and light receivers 120b and 121b, respectively, and optical axes 120c and 121c are formed between the projectors 120a and 121a and the light receivers 120b and 121b. Is done.

  The detection plate 122 is provided at one end of one rotating shaft 109 a and has an opening 123. As shown in FIG. 7, when both guide rollers 107a and 107b descend to the pressed position F, the optical axis 120c of the first photoelectric sensor 120 passes through the opening 123 and the second second as shown in FIG. The optical axis 121 c of the photoelectric sensor 121 is blocked by the detection plate 122. As shown in FIG. 11, when both guide rollers 107a and 107b are raised to the retracted position G, as shown in FIG. 12, the optical axis 121c of the second photoelectric sensor 121 passes through the opening 123 and the first The optical axis 120 c of one photoelectric sensor 120 is configured to be blocked by the detection plate 122. Note that, at a position between the pressed position F and the retracted position G, the optical axes 120 c and 121 c of both the photoelectric sensors 120 and 121 are blocked by the detection plate 122.

The rotary shafts 95, 96, 109a, 109b, the motors 98, 112, the guide shaft 94, and the like are provided on a frame 118 attached above the deinking tank 23.
As shown in FIGS. 6 and 10, a maintenance water level sensor 20 is disposed on the surrounding plate 43 of the deinking tank 23, and the water level in the tank in the deinking tank is the upper limit water level on the wall of the deinking tank 23. An upper limit water level detection unit 205 that detects that the water level has reached the upper limit water level and a lower limit water level detection unit 206 that detects that the water level in the tank of the deinking tank 23 has reached the lower limit water level are provided. The maintenance water level sensor 20, the upper limit water level detection unit 205, and the lower limit water level detection unit 206 use capacitance type or electric resistance type water level sensors.

  As shown in FIG. 17, the control unit 200 controls the paper material supply device control function unit 207 that controls the paper material supply device 8, the pulper device control function unit 208 that controls the pulper device 6, and the deinking device 10. Water level in the tank for controlling the pulp-containing liquid control unit 211 including the deinking device control function unit 209, the blade unit control function unit 210 for controlling the blade unit 80, and the pulp-containing liquid supply pump 201 and the diluent supply pump 202. A control function unit 212, a defoaming solution injection unit control function unit 213 for controlling the defoaming solution injection unit 46 of the defoaming device 45, a papermaking device control function unit 214 for controlling the papermaking device 12, and a wet paper web dehydrating device 13. A wet paper web dehydrating device control function unit 215 for controlling the wet paper web drying device control function unit 216 for controlling the wet paper web drying device 14 and a finishing device control function unit 217 for controlling the finishing device 15. To have.

Hereinafter, the operation of the above configuration will be described.
[Blade action]
The movement of the movable blade 81 when the movable blade 81 is moved by the moving device 82 will be described.

  As shown in FIGS. 5 and 6, when the motor 98 of the first moving mechanism 84 is positively driven to rotate the driving pulley 99 in one direction, this rotation is driven by the driving belt 101, the driven pulley 100, and the other rotating shaft. 96, the other pulley 92, the belt 93, the one pulley 91, and the one rotating shaft 95. Accordingly, both belts 93 rotate in one direction, and the attachment member 89 and the movable blade 81 move in one direction C together with the movable body 86.

  Further, by reversely driving the motor 98 and rotating the drive pulley 99 to the other side, both belts 93 are rotated in the other direction as shown in FIG. Moves in the return direction D.

  Further, as shown in FIG. 5, by driving the motor 112 of the second moving mechanism 85 and rotating the driving pulley 113 in one direction, this rotation is driven by the driving belt 115, the driven pulley 114, the other rotating shaft 109b, The two interlocking pulleys 116a and 116b, the interlocking belt 117, and one rotating shaft 109a are transmitted. As a result, as shown in FIGS. 7 and 11, both the rotating shafts 109a and 109b rotate in the same direction, and both guide rollers 107a and 107b move up and down between the pressed position F and the retracted position G.

  As shown in FIGS. 6 and 7, when both guide rollers 107 a and 107 b are lowered to the pressing position F, both guide rollers 107 a and 107 b push down the mounting member 89 against the biasing force of the coil spring 103. 81 descends to the lowered position I. At this time, the optical axis 120c of the first photoelectric sensor 120 passes through the opening 123 and the optical axis 121c of the second photoelectric sensor 121 is blocked by the detection plate 122, as shown in FIG. It is detected that the blade 81 is lowered to the lowered position I.

  As shown in FIG. 6, when the movable blade 81 is moved down to the lowered position I and moves in one direction C, the horizontal plate portion 89a of the mounting member 89 slides with respect to both guide rollers 107a and 107b. .

  Further, as shown in FIGS. 10 and 11, when both guide rollers 107 a and 107 b are raised to the retracted position G, both guide rollers 107 a and 107 b are separated above the attachment member 89, so that the attachment member 89 is the coil spring 103. The movable blade 81 is raised to the raised position H by being lifted by the urging force. At this time, the optical axis 121c of the second photoelectric sensor 121 passes through the opening 123 and the optical axis 120c of the first photoelectric sensor 120 is blocked by the detection plate 122, as shown in FIG. It is detected that the blade 81 has been raised to the raised position H.

As described above, by combining the movement of the movable blade 81 in one direction C and the return direction D with the movement in the vertical direction, the movable blade 81 is moved from the raised position H to the lowered position I as shown in FIG. In the state of being lowered to the end position B from the start position A to the end position B, and then moved back in the direction D from the end position B to the start position A. Accordingly, it can be moved along the moving path 124 that draws a rectangle above the opening 27 of the deinking tank 23.
[Recycled paper processing]
As shown in FIG. 1, in the process of manufacturing recycled paper 4 from used paper 2 in the used paper recycling processing device 1, the paper material obtained by shredding the used paper 2 is supplied to the pulper device 6 by the paper material supply device 8. Then, the pulp-containing liquid 5 is manufactured by being disaggregated in the pulper device 6. The pulp-containing liquid 5 obtained by the pulper device 6 has a fiber concentration of 7%, and the pulp-containing liquid 5 is stored in the storage tank 9 after the fiber concentration is diluted to about 2.5%.

  Thereafter, the pulp-containing liquid 5 is supplied from the storage tank 9 to the deinking apparatus 10 by the pulp-containing liquid supply pump 201, and the white water in the white water tank 18 is supplied by the diluent supply pump 202, so that the fiber concentration is 0.5%. Dilute to In the deinking apparatus 10, the coloring component for printing is removed from the pulp-containing liquid 5, and the deinking pulp-containing liquid is supplied from the deinking apparatus 10 to the papermaking apparatus 12 to produce wet paper.

The wet paper produced in this way is dehydrated by the wet paper dewatering device 13 and then dried by the wet paper drying device 14 to produce the recycled paper 4. The recycled paper 4 is finished by the finishing device 15 and then discharged from the used paper recycling processing device 1.
[Deinking process]
In the deinking device 10, as shown in FIG. 2, the pulp-containing liquid 5 in the storage tank 9 is introduced into the deinking tank 23 from the inflow portion 33, and at this time, between the storage tank 9 and the deinking tank 23. In this flow path, a deinking agent is put into the pulp-containing liquid 5. A large number of fine bubbles 24 are discharged from the bubble discharge surface of the bubble discharge device 25 into the pulp-containing liquid 5 in the deinking tank 23 and adhere to the foam 24 on which the coloring components for printing in the pulp-containing liquid 5 are floating. To do. Thereafter, the foam 24 floats on the surface of the pulp-containing liquid 5 in the deinking tank 23 and tries to overflow from the opening 27 to the outside.

  At this time, the blade unit control function unit 210 of the control unit 200 controls the blade unit 80 to receive the foam 24 when the upper limit water level detection unit 205 detects that the water level in the tank has reached the upper limit water level. Push towards 38.

  That is, as shown in FIG. 6, in a state where the movable blade 81 is lowered from the rising position H to the lowering position I, the movable blade 81 is moved laterally in one direction C from the start end position A to the end position B, and the foam 24 is overflowed. Collect to part 29 side.

  As a result, the foam 24 is pushed in one direction C by the movable blade 81, overflows from the foam overflow portion 29 to the outside of the deinking tank 23, and enters the foam receiving portion 38 from the upper end inlet 39 as shown in FIG. , And is discharged from the lower end outlet 40 onto the mesh belt 57 of the deinking drainage treatment device 17.

  At this time, as shown in FIG. 3, the upper end inlet 39 of the foam receiving portion 38 is adjacent to the bubble overflow portion 29 and the length L1 of the upper end inlet 39 and the length L3 of the bubble overflow portion 29 are the same. Since the lower end outlet 40 is formed immediately below the upper end inlet 39, all the foam 24 overflowing the foam overflow portion 29 surely flows into the foam receiving portion 38 from the upper end inlet 39, and the foam receiving portion. It flows down in the vertical direction from the top to the bottom in 38 and is discharged onto the mesh belt 57 from the lower end outlet 40.

  Therefore, bubbles do not flow in the horizontal flow path along the periphery of the opening as in the conventional case, and the foam 24 overflowing from the opening 27 of the deinking tank 23 is smoothly discharged to the deinking drainage treatment apparatus 17. It is possible.

  In addition, after moving the movable blade 81 in one direction C to the terminal position B as described above, the movable blade 81 is moved from the lowered position I to the raised position H at the terminal position B, and then moved in the other direction D from the terminal position B. Then, the operation of returning to the starting position A and lowering from the rising position H to the lowering position I at the starting position A is repeated as necessary. One cycle of the reciprocating motion of the movable blade 81 is about 10 seconds.

  Further, when the movable blade 81 is returned from the end position B to the start end position A as described above, the movable blade 81 is raised from the lowered position I to the raised position H, so that the movable blade 81 is moved from the foam 24 of the opening 27. Can also be retracted upward. Thereby, it is possible to prevent the movable blade 81 from extruding the foam 24 in the other direction D.

  In this way, the movable blade 81 of the blade unit 80 moves while maintaining a constant height when the foam 24 is pushed out. On the other hand, the foam 24 on the liquid level in the deinking tank moves up and down as the liquid level fluctuates up and down. For this reason, when the water level in the tank is at the upper limit water level, the movable blade 81 comes closest to the liquid level, and the movable blade 81 corresponds to a region including the lower end of the foam layer on the liquid level. The amount of foam remaining on the liquid surface after scraping off the foam is minimized.

  The amount of foam generated in the deinking tank 23 is greatest when the water level in the tank reaches the upper limit water level, that is, when a new pulp-containing liquid flows into the deinking tank 23. For this reason, when the water level in the tank reaches the upper limit water level, the foam 24 is pushed out toward the foam receiving portion 38 by the movable blade 81, so that the foam 24 is scraped off at the optimum timing when the foam 24 becomes the largest. Can be discharged.

  In the present embodiment, the movable blade 81 is operated using the upper limit water level as an index, but it is also possible to detect and operate the foam 24 with a sensor or the like. However, it should be noted that the sensor becomes dirty with the foam 24 and malfunctions.

  In addition, the pulp-containing liquid before deinking flows into the deinking tank 23, and the deinked pulp liquid after the deinking process flows out to the paper making apparatus 12 in the next step. In order to continuously supply the deinking pulp liquid from the deinking tank 23 to the paper making apparatus 12 without interruption, the pulp-containing liquid before deinking is supplied to the deinking tank 23 while ensuring a liquid amount of a certain amount or more. There is a need to.

  For this reason, the tank water level control function unit 212 of the control unit 200 controls the pulp-containing liquid supply pump 201 and the diluent supply pump 202 of the pulp-containing liquid control unit 211 so that the water level in the tank is the upper limit water level detection unit 205. It holds between the upper limit water level to be detected and the lower limit water level to be detected by the lower limit water level detection unit 206.

  That is, when the water level in the tank reaches the upper limit water level, the pulp-containing liquid supply pump 201 and the dilution liquid supply pump 202 are stopped, and when the water level in the tank reaches the lower limit water level, the pulp-containing liquid supply pump 201 and the dilution liquid are diluted. The liquid supply pump 202 is activated to supply the pulp-containing liquid intermittently.

  Therefore, by using the upper limit water level detection unit 205 for both the water level control and the operation control of the movable blade 81, the scraping control of the foam 24 by the movable blade 81 can be performed in association with the water level control in the deinking tank. it can.

  Further, as shown in FIGS. 9, 10, and 14, by operating the supply pump 48 of the defoaming device 45, the defoaming solution 44 in the filtrate tank 71 is ejected from the supply piping 47. It is supplied to the section 46 and is sprayed from the spray nozzle 46 b onto the foam 24 overflowing the foam overflow section 29. Thereby, the foam 24 can be extinguished.

  At this time, the antifoam solution 44 can be sprayed over a wide range by rotating the antifoam solution injection section 46 in the vertical direction, and the defoaming efficiency is improved. Furthermore, as shown by the phantom lines in FIG. 10, the antifoam solution 44 is sprayed onto the inner surface of the foam receiving portion 38 to clean the inner surface of the foam receiving portion 38 or collected by the movable blade 81. When discharging the foam 24 to the foam receiving portion 38, the foam 24 is pushed out to the foam receiving portion 38 by spraying the defoaming solution 44 toward the movable blade 81 and washing away the foam 24 attached to the movable blade 81 1. All of the foam 24 that has been scraped in the process can be discharged to the foam receiving portion 38.

  Further, the control unit 200 adjusts the concentration of the defoaming solution 44 based on the detection of the bubble detection sensor 51 of the deinking processing device 21, and the optical axis 51c formed between the projector 51a and the light receiver 51b is cut off. In this case, a predetermined amount of the antifoam 73 is injected from the antifoam tank 75 into the filtrate tank 71 by operating the injection pump 77 of the antifoam injection device 74 for a predetermined time.

  As described above, in the present embodiment, each time the upper limit water level detection unit 205 detects that the water level in the tank of the pulp-containing liquid 5 has reached the upper limit level in the deinking device 10, the foam 24 is generated by the movable blade 81. It pushes out toward the foam receiving part 38.

  By the way, when the water level in the tank of the pulp-containing liquid 5 of the deinking device 10 reaches the upper limit water level, the pulp fibers and the like contained in the pulp-containing liquid 5 also stay near the upper limit water level, and as shown in FIG. Pulp fibers and the like 501 adhere to the inner peripheral surface of the deinking tank from the periphery to the upper end of the deinking tank, and these remain and accumulate on the inner peripheral surface of the deinking tank even after the water level in the tank is lowered.

  If this state is left as it is, when the foam 24 is pushed out toward the foam receiving portion 38 by the movable blade 81, pulp fibers accumulated on the inner peripheral surface of the deinking tank from the peripheral edge of the upper limit water level to the upper end of the deinking tank, etc. Becomes an inhibiting factor that hinders the flow of the foam 24. Further, when the accumulated pulp fibers 501 are separated from the inner surface of the deinking tank in a lump and sink into the deinking tank, the pulp fibers are sent to the next paper making section as a lump to improve the quality of the recycled paper. Deteriorating factor.

  For this reason, a preset timing, for example, every time the movable blade 81 returns from the end position B to the start end position A, or every time the movable blade 81 pushes the foam 24 toward the foam receiving portion 38 several times. Or the following operations are performed at regular intervals. That is, the pulp-containing liquid 5 is introduced into the deinking tank 23 from the storage tank 9, and overflow control is performed to overflow the pulp-containing liquid 5 from the upper end of the deinking tank to the foam receiving part 38, thereby deinking from the periphery of the upper limit water level. A washing operation for washing away pulp fibers 501 remaining on the inner peripheral surface of the deinking tank over the upper end of the tank is performed to prevent the pulp fibers from accumulating.

  Along with the overflow control, the reciprocating operation of the movable blade 81 that pushes the foam 24 toward the foam receiving portion 38 is used in combination, so that the most effective cleaning operation is performed and the pulp fibers remaining on the inner peripheral surface of the deinking tank Etc. 501 can be sufficiently washed away.

DESCRIPTION OF SYMBOLS 1 Waste paper reproduction processing apparatus 2 Waste paper 4 Recycled paper 5 Pulp containing liquid 10 Deinking apparatus 17 Deinking drainage processing apparatus 21 Deinking processing apparatus 23 Deinking tank 24 Foam 27 Opening part 29 Foam overflow part 38 Foam receiving part 39 Upper end Inlet 40 Lower end outlet 44 Defoaming solution 45 Defoaming device 46 Defoaming solution injection unit 51 Foam detection sensor 56 Deinking drainage 57 Mesh belt 80 Blade unit 81 Movable blade 200 Control unit 201 Pulp-containing liquid supply pump 202 Diluent supply pump 203 Deinking pulp containing liquid supply pump 204 Seal member 205 Upper limit water level detection unit 206 Lower limit water level detection unit 207 Paper material supply device control function unit 208 Pulper device control function unit 209 Deinking device control function unit 210 Blade unit control function unit 211 Pulp Contained liquid control unit 212 In-tank water level control function unit 213 Defoaming solution injection unit control function unit 214 Paper machine controller Function unit 215 Wet paper dewatering device control function unit 216 Wet paper drying device control function unit 217 Finishing device control function unit

Claims (2)

Comprising a plurality of processing units constituting the used paper recycling processing system, a control unit for controlling each processing unit, deinking unit form one processing unit includes a deinking vessel responsible for deinking process, the Datsusumiso It is provided only at the end in one direction, and the foam receiving part that foams on the liquid level in the deinking tank overflows from the bubble outlet of the deinking tank, and the water level in the tank reaches the upper limit water level. An upper limit water level detection unit for detecting the water level, and the movable blade is moved in the one direction from the start position to the end position to extrude the foam toward the foam receiving part, and the movable blade is retracted upward from the foam and terminated. A blade part that moves from the position to the start end position , and the control part controls the blade part when the upper limit water level detection part detects that the water level in the tank has reached the upper limit water level. It has a blade portion control function unit for pushing toward, deinking unit, one-way end of the Datsusumiso Only provided, toward the movable blade to wait at the end side of the extruding the foam to受泡unit, characterized by having a defoaming solution injection unit for injecting an antifoaming solution defoaming the foam Waste paper recycling processor.   The deinking unit includes a pulp-containing liquid control unit that controls the supply amount of the pulp-containing liquid before deinking supplied to the deinking tank, and a lower limit water level that detects that the water level in the tank of the deinking tank has reached the lower limit water level. The tank which has a detection part, a control part controls a pulp content liquid control part, and holds between the upper limit water level which detects the water level in a tank with an upper limit water level detection part, and the lower limit water level detected with a lower limit water level detection part The used paper recycling apparatus according to claim 1, further comprising an internal water level control function unit.

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