WO2011021528A1

WO2011021528A1 - Waste paper recycling device

Info

Publication number: WO2011021528A1
Application number: PCT/JP2010/063511
Authority: WO
Inventors: 嘉英杉山
Original assignee: デュプロ精工株式会社
Priority date: 2009-08-20
Filing date: 2010-08-10
Publication date: 2011-02-24
Also published as: JP2011042890A; DE112010003336T5; JP5692975B2

Abstract

A whiteness selection device (98) that selects a plurality of differing degrees of whiteness, an economy operation selection device (99) that selects economy operation, and a control unit (97) are disposed; wherein the control unit (97), when the whiteness is selected by the whiteness selection device (98), controls at least one deinking condition from among the holding time for which a waste paper material solution (37) is held within a deinking tank (39), the deinking agent addition amount by which a deinking agent (58) is added to the waste paper material solution (37), and the amount thereof diffused to the interior of the deinking tank (39), in response to the selected whiteness, and controls in a manner such that the waste paper material solution (37) obtained in a pulper (17) is supplied to a papermaking device (4) without passing through the deinking tank (39), when the economy operation is selected by the economy operation selection device (99).

Description

Waste paper recycling processor

The present invention relates to a used paper recycling apparatus for producing recycled paper from a used paper raw material solution obtained by breaking up used paper.

Conventionally, this type of used paper recycling apparatus includes, as shown in FIG. 12, for example, a used paper pulp manufacturing unit 132 that separates used paper 131 to produce recycled pulp, and a recycled pulp manufactured in the used paper pulp manufacturing unit 132. A deinking unit 133 for deinking, and a papermaking unit 134 for papermaking the deinked pulp obtained in the deinking unit 133 and drying the wet paper obtained by papermaking.

The waste paper pulp manufacturing unit 132 is provided with a pulper 135 that stirs the cut waste paper 131 with water to break it apart. The pulper 135 has a stirring tank 136 and a stirring blade 137, and the recycled waste paper 131 and water 138 are put into the stirring tank 136 by adding the cut waste paper 131 and water to the stirring tank 136 and stirred. Is generated.

The deinking unit 133 includes a deinking tank 139 for introducing the regenerated pulp-containing liquid 138 from the pulper 135, and an air diffuser 140 for performing aeration on the regenerated pulp-containing liquid 138 in the deinking tank 139. ing. By performing aeration with the aeration device 140, printing components such as ink components and toner components are separated from the recycled pulp-containing liquid 138. A deinking agent adding unit 141 is provided between the pulper 135 and the deinking tank 139 to add a deinking agent to the recycled pulp-containing liquid 138 introduced from the pulper 135 to the deinking tank 139. Yes.

According to this, the used paper 131 put into the used paper recycling apparatus 130 is cut and then put into the stirring tank 136, and the stirring blade 137 is rotated and stirred with water to be separated. Thereby, the recycled pulp containing liquid 138 is produced | generated in the stirring tank 136. FIG.

Thereafter, the recycled pulp-containing liquid 138 is introduced from the stirring tank 136 into the deinking tank 139, and at this time, the deinking agent is added to the recycled pulp-containing liquid 138 by the deinking agent adding unit 141. The regenerated pulp-containing liquid 138 introduced into the deinking tank 139 is diffused by the air diffuser 140, whereby bubbles 142 are ejected into the regenerated pulp-containing liquid 138 in the deinking tank 139, and the regenerated pulp-containing liquid The printing component in 138 adheres to the air bubbles 142, and the air bubbles 142 to which the printing components adhere adhere to the liquid surface and then are removed.

As described above, the recycled pulp-containing liquid 138 is deinked in the deinking tank 139 and then sent to the papermaking unit 134 as a deinked pulp-containing liquid containing deinked pulp. 143 is manufactured.

In Japanese Patent Laid-Open Publication No. JP-A-2001-259259, the amount of ink particles contained in the used paper raw material liquid is detected by a CCD camera after deinking, and based on this detection, the diffuser of the diffuser 140 Adjusting the volume is disclosed.

JP-A-10-82729

However, the above-described conventional format has a problem that the user cannot select the whiteness of the recycled paper 143 produced by the used paper recycling processor 130. In addition, there is a problem that it is not possible to perform a saving operation that gives priority to saving of power consumption over the whiteness of the recycled paper 143 and also considers the environment.

The present invention provides a used paper recycling processing apparatus that allows a user to select the whiteness of recycled paper, and that can save energy while giving priority to saving power consumption and environmentally friendly operation. The purpose is to do.

In order to achieve the above object, the first invention comprises a pulper that stirs and separates used paper with water, a deinking tank that diffuses into the used paper raw material liquid obtained in the pulper to separate printing components, and used paper A waste paper recycling apparatus having a paper making apparatus for making a raw material liquid,
At least one of a whiteness selection device for selecting the whiteness of the recycled paper to be produced from a plurality of different whitenesses and a saving operation selection device for selecting a saving operation, and a control unit,
When the predetermined whiteness is selected by the whiteness selection device, the control unit adds the residence time in which the used paper raw material liquid stays in the deinking tank and the deinking added to the used paper raw material liquid according to the selected whiteness. When at least one deinking condition of the amount of agent added and the amount of air diffused into the deinking tank is controlled and the saving operation is selected by the saving operation selection device, the waste paper raw material liquid obtained in the pulper is removed. Control is performed so that the paper is supplied to the papermaking apparatus without passing through the ink tank.

According to this, when the user selects the target whiteness by the whiteness selection device, the control unit selects at least one of the residence time, the addition amount of the deinking agent, and the amount of aeration according to the selected whiteness. One deinking condition. Thereby, the recycled paper of the selected whiteness is manufactured.

For example, when a whiteness higher than the standard is selected, the control unit increases the residence time beyond the standard residence time, increases the addition amount of the deinking agent than the standard addition amount, At least one of increasing the air volume above the standard air volume is performed. In addition, when a whiteness lower than the standard is selected, the control unit shortens the residence time from the standard residence time, reduces the addition amount of the deinking agent from the standard addition amount, At least one of reducing the air volume from the standard air volume is performed.

In addition, when the user selects the saving operation using the saving operation selection device, the control unit controls to supply the used paper raw material liquid obtained in the pulper to the paper making device without passing through the deinking tank. Thereby, the used paper raw material liquid obtained in the pulper is not deinked in the deinking tank, but is made by the papermaking apparatus. Therefore, the power, water, and processing time required for the deinking process are not required, so saving power consumption is given priority, and the amount of recycled pulp that is discharged as garbage along with the printing components during the deinking process is reduced. By making effective use of the recycled pulp as a raw material for recycled paper, environmentally-friendly saving operation can be performed.

The second invention includes a whiteness selection device, a saving operation selection device, a transfer device that transfers the used paper raw material liquid in the pulper to the deinking tank, and a bypass transfer device that transfers the used paper raw material solution in the pulper to the papermaking device. And
When the whiteness is selected by the whiteness selection device, the controller controls the transfer device to transfer the used paper raw material liquid from the pulper to the deinking tank, and when the saving operation is selected by the saving operation selection device, Control is performed so that the used paper raw material liquid is transferred from the pulper to the papermaking apparatus by the bypass transfer device.

According to this, when the user selects the target whiteness by the whiteness selection device, the control unit controls the transfer device to transfer the used paper raw material liquid from the pulper to the deinking tank.

Further, when the user selects the saving operation by the saving operation selection device, the control unit controls the waste paper raw material liquid to be transferred from the pulper to the paper making device by the bypass transfer device.

As a result, when whiteness is selected, the waste paper raw material liquid in the pulper can be easily transferred to the deinking tank for deinking treatment, and when saving operation is selected, the waste paper raw material liquid in the pulper is removed. It is possible to easily transfer to a paper making apparatus and make paper without deinking.

The third invention is provided with a detection device for detecting a printing rate of used paper to be put into the pulper or a coloring degree of the used paper raw material liquid in the pulper,
The control unit controls at least one deinking condition of the residence time, the addition amount of the deinking agent, and the amount of aeration according to the selected whiteness and the detection value detected by the detection device. .

According to this, when the user selects a target whiteness by the whiteness selection device, the control unit determines the residence time and the deinking agent according to the selected whiteness and the detection value detected by the detection device. At least one deinking condition of the addition amount and the amount of aeration is controlled. As a result, the recycled paper having the selected whiteness is manufactured without being affected by the printing rate of the used waste paper to be processed.

In the fourth aspect of the invention, the whiteness selection device includes a whiteness selection operation unit corresponding to a plurality of different whiteness levels.
The saving operation selection device comprises an operation unit for saving operation selection.

According to this, the user can select the target whiteness by operating the operation unit for whiteness selection, and can easily select the desired whiteness with a simple operation. Further, the user can select the saving operation by operating the operation unit for saving operation selection.

As described above, according to the present invention, it is possible for the user to select the whiteness of the recycled paper, and it is possible to select and perform a saving operation in consideration of the environment while giving priority to saving of power consumption. Is possible.

It is the schematic which shows the structure of the used paper reproduction | regeneration processing apparatus in the 1st Embodiment of this invention. It is a schematic sectional drawing which shows the structure of the used paper pulp manufacturing apparatus of a used paper reproduction | regeneration processing apparatus equally. It is a schematic sectional drawing which shows operation | movement of the used paper pulp manufacturing apparatus of a used paper reproduction | regeneration processing apparatus equally. FIG. 2 is a detailed view showing the configuration of the used paper recycling processing apparatus. It is a figure of the aeration means of the deinking tank of a used paper reproduction | regeneration processing apparatus. It is a schematic perspective view which shows the structure of the paper making apparatus of a used paper reproduction | regeneration processing apparatus. 2 is a block diagram of a control system of the used paper recycling processing apparatus. FIG. 3 is a flowchart showing control of the used paper recycling processing apparatus. It is a figure which shows the structure of the used paper reproduction | regeneration processing apparatus in the 2nd Embodiment of this invention. It is a graph which shows the height relationship of the rotational speed of the pump of a used paper reproduction | regeneration processing apparatus similarly. It is a figure which shows the structure of the used paper reproduction | regeneration processing apparatus in the 3rd Embodiment of this invention. It is a figure which shows the structure of the conventional waste paper reproduction | regeneration processing apparatus.

(First embodiment)
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings. FIG. 1 is a schematic diagram showing a configuration of a used paper recycling processing apparatus 1. The used paper recycling processing apparatus 1 is a small one that integrally includes a used paper pulp manufacturing apparatus 2, a deinking apparatus 3, a paper making apparatus 4, a finishing apparatus 5, and a drainage processing apparatus 6.

The used paper pulp manufacturing apparatus 2 is used to produce recycled pulp by breaking up the used paper 7. The deinking device 3 deinks the recycled pulp produced by the used paper pulp production device 2. The paper making device 4 makes a waste paper raw material liquid containing either the deinked pulp obtained by the deinking device 3 or the recycled pulp produced by the used paper pulp manufacturing device 2, and dries the wet paper obtained by the paper making. Is. The finishing device 5 performs finishing by cutting the dried wet paper in the paper making device 4 to obtain recycled paper 8. The drainage processing device 6 processes the drainage generated in the deinking device 3 and the papermaking device 4, respectively.
(Used paper pulp production equipment 2)
First, the configuration of the used paper pulp manufacturing apparatus 2 will be described. 2 and 3 are schematic views showing the internal structure of the used paper pulp manufacturing apparatus 2. The used paper pulp manufacturing apparatus 2 produces recycled pulp by breaking up the used paper 7. The used paper input unit 11, the shredder 12, the metal piece removing unit 13, the pressing unit 14, the shredder tank 15, and the cut paper amount adjusting unit 16. And a pulper 17.

The used paper input unit 11 is an opening through which used paper 7 to be processed is input into the used paper pulp manufacturing apparatus 2. The shredder 12 cuts the used waste paper 7 into a cut paper piece 20 having a predetermined size suitable for the production of recycled pulp. The metal piece removing unit 13 removes metals such as staples of a stapler, and is composed of a magnet or the like.

The pressing unit 14 includes a pressing member 22 that presses the cutting paper piece 20 in the shredder tank 15 downward to reduce the bulk of the cutting paper piece 20, and an elevating device 23 that raises and lowers the pressing member 22. The shredder tank 15 temporarily stores the cut paper piece 20, and the discharge port 26 is provided with a discharge device 27 that discharges the cut paper piece 20 in the shredder tank 15.

The cutting paper amount adjusting unit 16 includes a receiving tray 29 that receives the cutting paper piece 20 discharged from the discharge port 26 and a measuring unit 30 that measures the weight of the cutting paper piece 20 received by the receiving tray 29. The tray 29 is tiltable over a horizontal posture shown in FIG. 2 and an inclined posture inclined toward the pulper 17 shown in FIG. Further, the side wall 29a adjacent to the pulper 17 of the tray 29 is provided so as to be openable and closable between the normal position of the standing posture shown in FIG. 2 and the tilting position tilting toward the pulper 17 shown in FIG. It is configured to tilt with the tilting of 29 and return to the standing posture with the backward movement of the tray 29.

The pulper 17 stirs the cut paper piece 20 of the waste paper 7 with water and a liquid of a disaggregation accelerator and disaggregates to produce recycled pulp. The pulper 17 includes a stirring tank 32 into which the cut paper piece 20 is charged, a water supply unit 33 that supplies water to the stirring tank 32, and a disaggregation accelerator supply unit 34 that supplies the disaggregation accelerator to the stirring tank 32.

At the bottom of the agitation tank 32, a stirring blade 35 for agitating and separating the cutting paper piece 20 together with the water supplied from the water supply part 33, a driving device 36 such as a motor for rotationally driving the agitation blade 35, The extraction part 38 which takes out the reproduction | regeneration pulp containing liquid 37 (an example of a used paper raw material liquid) produced | generated in is provided.

The regenerated pulp-containing liquid 37 is a liquid containing regenerated pulp obtained by disaggregating the cut paper piece 20 in the stirring tank 32. In addition to the regenerated pulp, the recycled paper 7 and water in the middle of disaggregation are used. And a liquid containing a printing component such as an ink component and a toner component taken out in water, a disaggregation accelerator, and the like.
(Deinking device 3)
Next, the configuration of the deinking device 3 will be described. As shown in FIG. 1, the deinking device 3 is called a flotator and is provided on the downstream side (rear side) of the used paper pulp manufacturing device 2, and in the recycled pulp-containing liquid 37 obtained in the pulper 17. A deinking tank 39 for separating the printing components by aeration is provided.

As shown in FIGS. 4 and 5, at the front end (one end) of the bottom of the deinking tank 39, there is an inflow part 40 for allowing the recycled pulp-containing liquid 37 in the stirring tank 32 to flow into the deinking tank 39. Is provided. In addition, a deinking pulp containing liquid (an example of a used paper raw material liquid) containing deinked pulp that has been deinked is placed outside the deinking tank 39 at the rear end (the other end) of the bottom of the deinking tank 39. An outflow part 41 is provided for the outflow.

The interior of the deinking tank 39 is partitioned into a plurality of deinking chambers 44a to 44c by a partition wall 43, and all of the deinking chambers 44a to 44c communicate with each other by opening a part of the partition wall 43. As a result, a flow path is formed in the deinking tank 39 from the upstream inflow portion 40 to the downstream outflow portion 41 through the deinking chambers 44a to 44c. Further, the deinking tank 39 is provided with a water level meter 53 for detecting the position of the liquid level in the tank (hereinafter referred to as the water level).

The deinking device 3 is provided with an air diffuser 46 that ejects bubbles 45 into the deinking tank 39. The air diffuser 46 includes flat plate-shaped first to fourth bubble generating members 47a to 47d disposed at the bottom of the deinking tank 39, and an air supply device 48 for supplying air to the bubble generating members 47a to 47d. is doing. A porous body or the like is used for the bubble generating members 47a to 47d.

The air supply device 48 includes a plurality of

air pumps

49a and 49b for supplying air, and a plurality of air supply pipes 50a to 50d connected between the

air pumps

49a and 49b and the bubble generating members 47a to 47d. The supply pipes 50a to 50d are provided with first to fourth supply solenoid valves 51a to 51d. The air supply solenoid valves 51a to 51d correspond to the bubble generating members 47a to 47d. By individually opening and closing the air supply electromagnetic valves 51a to 51d, the bubbles 45 are changed to the bubble generating members 47a. Occurs individually for every ~ 47d.

Between the pulper 17 and the deinking tank 39, a transfer device 54 for transferring the recycled pulp-containing liquid 37 in the stirring tank 32 to the deinking tank 39 is provided. The transfer device 54 includes a transfer pipe 55 and a first pump 56. The upstream end (one end) of the transfer line 55 is connected to and communicates with the take-out part 38 of the stirring tank 32, and the downstream end (other end) of the transfer line 55 is the inflow part of the deinking tank 39. 40 to communicate with each other. The first pump 56 is provided in the middle of the transfer pipeline 55.

A deinking agent adding device 59 for adding a deinking agent 58 to the regenerated pulp-containing liquid 37 upstream of the deinking tank 39 and a regenerated pulp-containing liquid by injecting dilution water (tap water) into the deinking device 3. A regenerated pulp diluting device 60 is provided for diluting 37 to a predetermined fiber concentration suitable for deinking (for example, about 0.3 to 1.0% by weight).

The deinking agent adding device 59 includes a deinking agent tank 61 for storing the deinking agent 58, a deinking agent supply pipe 62 connected to the deinking agent tank 61 in the middle of the transfer pipe 55, and a deinking agent. A charging pump 63 and a charging solenoid valve 64 provided in the charging pipe 62 are provided. Note that a surfactant or the like is used for the deinking agent 58.

Further, the regenerated pulp diluting device 60 includes a diluting water tank 60b for storing the diluting water 60a, a diluting water injection pipe 60c connected to the middle of the transfer pipe 55 and the diluting water tank 60b, and a diluting water injection pipe 60c. A water injection pump 60d and a water injection electromagnetic valve 60e are provided.
(Paper making machine 4)
Next, the configuration of the paper making apparatus 4 will be described. As shown in FIG. 1, the paper making device 4 is provided on the downstream side (rear side) of the deinking device 3, and the deinking pulp-containing liquid (used paper raw material liquid) that has been deinked in the deinking tank 39. Papermaking. Further, as shown in FIG. 6, the paper making apparatus 4 includes a head box 66, a wire part 67, a dewatering part 68, and a dryer part 69.

The head box 66 is for uniformly supplying the deinked pulp-containing liquid (used paper raw material liquid) discharged from the deinking tank 39 to the wire portion 67. Moreover, the wire part 67 is provided with the endless mesh belt 70, the dew pulp containing liquid is filtered and dehydrated by the mesh belt 70, and the wet paper is a fiber layer containing a relatively large amount of moisture. 71 is formed. As shown in FIG. 4, the wire portion 67 is provided with a white water tank 72 that collects and stores the filtrate that has passed through the mesh belt 70 (hereinafter referred to as white water 79).

A discharge pipe 80 is connected between the outflow part 41 of the deinking tank 39 and the head box 66, and a second pump 81 is provided in the discharge pipe 80.

As shown in FIG. 6, the dewatering unit 68 includes an endless water absorbing belt 73 and a pressing roller 74. The water absorbing belt 73 absorbs water contained in the wet paper 71, and the pressing roller 74 presses the water. Thus, the wet paper web 71 is dehydrated. The dryer unit 69 includes a rotating roller 75, a drying roller 76 with a built-in heater, and a conveying belt 77 stretched between the

rollers

75 and 76. The drying roller 76 dries the wet paper 71 and finishes it. This is for obtaining the previous recycled paper 78.

As shown in FIG. 4, a bypass for transferring the recycled pulp-containing liquid 37 in the stirring tank 32 of the pulper 17 to the head box 66 is provided between the transfer pipe 55 of the transfer device 54 and the head box 66 of the paper making device 4. A transfer pipe 83 (an example of a bypass transfer device) is connected.

The upstream end (one end) of the bypass transfer conduit 83 is connected to the transfer conduit 55, and the downstream end (the other end) is connected to and communicates with the head box 66.

A switching device 84 that switches the flow direction between the transfer pipeline 55 and the bypass transfer pipeline 83 is provided at a branch portion between the transfer pipeline 55 and the bypass transfer pipeline 83. The switching device 84 includes a first switching electromagnetic valve 85 provided in the transfer pipeline 55 and a second switching electromagnetic valve 86 provided in the bypass transfer pipeline 83.

Between the white water tank 72 and the bypass transfer pipe 83, a diluting device for diluting the regenerated pulp-containing liquid 37 by supplying the white water 79 in the white water tank 72 to the regenerated pulp-containing liquid 37 flowing in the bypass transfer pipe 83. 106 is provided. The dilution device 106 includes a dilution pipe 107 connected between the white water tank 72 and the bypass transfer pipe 83, a dilution pump 108 and a dilution electromagnetic valve 109 provided in the dilution pipe 107. ing.
(Finishing device 5)
Next, the configuration of the finishing device 5 will be described. As shown in FIG. 1, the finishing device 5 is provided on the downstream side (rear side) of the paper making device 4 and includes a calendar unit 89 and a cutting unit 90. As shown in FIG. 6, the calendar unit 89 includes a press roller 91 for increasing the flatness of the recycled paper. The cutting unit 90 includes a cutting blade (not shown) that cuts recycled paper into a predetermined size.
(Drainage treatment device 6)
Next, the configuration of the drainage treatment apparatus 6 will be described. As shown in FIG. 1, the drainage treatment apparatus 6 has a deinking drainage tank 93 and a papermaking drainage tank 94. The wastewater in the deinking drainage tank 93, which is highly contaminated and difficult to reuse, is detoxified by performing a predetermined waste liquid treatment as required, and then discharged to the outside of the used paper recycling apparatus 1. It is configured. Also, the wastewater in the papermaking wastewater tank 94, which is low in contamination level and can be reused, is subjected to treatment such as removal of ink and toner through a filter and neutralization by adding chemicals as necessary. In addition, it is supplied to the pulper 17 again and is configured to be reusable.

4 and 7, the used paper recycling apparatus 1 is provided with an operation panel 96 and a control unit 97. The operation panel 96 is provided with a whiteness selection device 98 that selects a plurality of different whiteness levels for the recycled paper 8 to be manufactured, and a saving operation selection device 99 that selects a saving operation. The whiteness selection device 98 includes a standard whiteness selection button 100 (an example of a whiteness selection operation unit) corresponding to standard whiteness and a high whiteness selection corresponding to high whiteness higher than the standard whiteness. Button 101 (an example of a whiteness selection operation unit) and a low whiteness selection button 102 (an example of a whiteness selection operation unit) corresponding to a low whiteness lower than the standard whiteness. The saving operation selection device 99 includes a saving operation selection button 103 (an example of an operation unit for saving operation selection).

Based on the detected value of the water level gauge 53 and the ON / OFF operation of each of the selection buttons 100 to 103, the control unit 97 controls the

pumps

49a, 49b, 56, 60d, 63, 81, and the solenoid valves 51a to 51a. 51d, 60e, 64, 85, 86, 109 are controlled.

Hereinafter, the operation of the above configuration will be described.

(1) First, a case where recycled paper 7 is recycled to produce recycled paper 8 having standard whiteness will be described based on the flowchart shown in FIG.

In this case, the user presses the standard whiteness selection button 100 (S-1) and inputs the used paper 7 from the used paper input unit 11 of the used paper pulp manufacturing apparatus 2 as shown in FIG.

Thereby, the shredder 12 cuts the used paper 7 into a cut paper piece 20 having a predetermined size, the metal piece removing unit 13 removes the metals, and the cut paper piece 20 is temporarily stored in the shredder tank 15. At this time, as shown by a virtual line in FIG. 2, the pressing member 22 is lowered by the lifting device 23, and the cutting paper piece 20 is pressed downward by the pressing member 22, thereby reducing the bulk of the cutting paper piece 20. It is.

Next, the discharge device 27 is activated, the cut paper piece 20 in the shredder tank 15 is discharged from the discharge port 26 and dropped onto the tray 29, and the weight of the cut paper piece 20 in the tray 29 is measured by the measuring unit 30. . When the measured value by the measuring unit 30 reaches the set value, the discharging device 27 is stopped, and as shown in FIG. 3, the driving device is driven to tilt the tray 29 to the tilted posture, and the side wall 29a tilts. The cut paper piece 20 is put into the stirring tank 32 of the pulper 17.

In the pulper 17, prior to the cutting paper piece 20 being loaded, an amount of water corresponding to the amount of the cutting paper piece 20 to be loaded is supplied from the water supply unit 33 to the agitation tank 32 in advance, and the driving device 36 is operated. Then, the stirring blade 35 is rotated to stir the water in the stirring tank 32.

In such a state, the cutting paper piece 20 and the water can be easily mixed in the stirring tank 32 by inserting the cutting paper piece 20 as described above. Then, by putting the disaggregation accelerator into the agitation tank 32 from the disaggregation accelerator supply unit 34, the cut paper piece 20 is agitated with water and the disaggregation accelerator in the agitation tank 32 to form a recycled pulp-containing liquid 37.

Then, the control unit 97 executes the standard deinking process in which the deinking degree (degree) is standard in the deinking apparatus 3 as follows (S-2).

That is, as shown in FIG. 4, the control unit 97 drives the first pump 56, the charging pump 63, and the air pumps 49 a and 49 b, and the first switching electromagnetic valve 85, the charging electromagnetic valve 64, and the first The third supply solenoid valves 51a to 51c are opened, the second pump 81 and the dilution pump 108 are stopped, the second switching solenoid valve 86, the fourth supply solenoid valve 51d, and the dilution pump are stopped. The electromagnetic valve 109 is closed, and the water injection pump 60d is driven and the water injection electromagnetic valve 60e is opened.

As a result, the recycled pulp-containing liquid 37 in the agitation tank 32 is introduced into the deinking tank 39 through the transfer pipe 55, and at this time, the deinking agent 58 in the deinking agent tank 61 is supplied to the deinking agent charging pipe. 62 is added to the regenerated pulp containing liquid 37 flowing in the transfer pipe 55 and the diluted water 60a in the diluted water tank 60b flows in the transfer pipe 55 through the diluted water injection pipe 60c. Water is poured into the recycled pulp-containing liquid 37. As a result, the recycled pulp-containing liquid 37 flowing in the transfer pipe 55 is diluted to a predetermined fiber concentration suitable for deinking.

In addition, as shown in FIG. 5, air for diffusion is supplied to the first to third bubble generating members 47a to 47c by driving the

air pumps

49a and 49b, and is removed from the first to third bubble generating members 47a to 47c. Bubbles 45 are ejected into the recycled pulp-containing liquid 37 in the ink tank 39. At this time, the water level of the recycled pulp-containing liquid 37 in the deinking tank 39 is detected by the water level gauge 53, and when the detected water level reaches the predetermined water level W, the control unit 97 drives the second pump 81. As a result, the regenerated pulp-containing liquid 37 flows into the deinking tank 39 from the inflow portion 40 and is deinked while flowing through the

deinking chambers

44a and 44b while maintaining the predetermined water level W, thereby including deinking including deinked pulp. It flows out from the outflow part 41 as a pulp containing liquid (waste paper raw material liquid).

At this time, since the standard whiteness is selected by the standard whiteness selection button 100 as described above, the control unit 97 sets the rotational speeds of the first pump 56, the input pump 63, and the

air pumps

49a and 49b, respectively. Control to a predetermined standard rotational speed R.

Thus, as shown in FIG. 8 (S-2), the residence time in which the recycled pulp-containing liquid 37 stays in the deinking tank 39 (that is, the recycled pulp-containing liquid 37 flows into the deinking tank 39). The time until the ink flows out of the deinking tank 39) is a predetermined standard residence time T. Further, the addition amount of the deinking agent 58 added to the regenerated pulp-containing liquid 37 becomes a predetermined standard addition amount A, and the amount of air diffused with respect to the regenerated pulp-containing liquid 37 in the deinking tank 39 is a predetermined standard aeration. The amount is B. Thus, the standard deinking process can be performed (S-2).

When the standard deinking process as described above is completed, as shown in FIG. 4, the deinked pulp-containing liquid (used paper raw material liquid) passes from the deinking tank 39 through the discharge pipe 80 to the head box 66 of the papermaking apparatus 4. Is supplied from the head box 66 to the wire portion 67 uniformly. The deinked pulp-containing liquid supplied to the wire part 67 is dehydrated and filtered by the mesh belt 70, whereby the wet paper 71 is formed. At this time, the white water 79 filtered by the mesh belt 70 is stored in the white water tank 72.

Further, as shown in FIG. 6, the moisture of the wet paper 71 is absorbed by the water absorbing belt 73 of the dewatering unit 68, and the wet paper 71 is further squeezed and dehydrated by the squeezing roller 74, and then the dryer unit 69 is dried. It is dried with a roller 76. Thereby, the recycled paper 78 before finishing is obtained.

Thereafter, the recycled paper 78 before finishing is conveyed from the dryer unit 69 to the calendar unit 89 of the finishing device 5, pressed by the press roller 91 to increase the flatness, and then cut into a predetermined size by the cutting unit 90. The Thereby, as shown in FIG. 1, the recycled paper 8 which has standard whiteness is manufactured.

(2) Next, a case where recycled paper 7 is recycled to produce recycled paper 8 having high whiteness will be described below. In addition, the content which overlaps with description in the case of manufacturing the recycled paper 8 which has the standard whiteness described in said (1) is abbreviate | omitted.

In this case, the user presses the high whiteness selection button 101 (S-3), and inputs the used paper 7 from the used paper input unit 11 of the used paper pulp manufacturing apparatus 2 as shown in FIG. Thereby, the control unit 97 executes the high deinking process in the deinking apparatus 3 in which the degree of deinking is improved from the standard level as follows (S-4).

That is, as shown in FIG. 4, the control unit 97 opens the first to fourth air supply solenoid valves 51a to 51d, and further, the rotation speed of the first pump 56 is a low rotation speed lower than the standard rotation speed R. In addition to controlling RL (ie, RL <R), the rotational speeds of the input pump 63 and the

air pumps

49a and 49b are each controlled to be higher than the standard rotational speed R (ie, RH> R).

Thereby, the residence time becomes the extended residence time TL (that is, TL> T) longer than the standard residence time T. Further, the addition amount of the deinking agent 58 added to the recycled pulp-containing liquid 37 becomes the first addition amount A1 (that is, A1> A) larger than the standard addition amount A. Furthermore, since the bubbles 45 are ejected from the first to fourth bubble generating members 47a to 47d into the recycled pulp-containing liquid 37 in the deinking tank 39, the amount of air diffused to the recycled pulp-containing liquid 37 in the deinking tank 39 Becomes the first air diffusion amount B1 that is larger than the standard air diffusion amount B (that is, B1> B). Thus, high deinking processing can be performed (S-4).

When the high deinking process as described above is completed, paper is made in the paper making device 4 and finished by the finishing device 5 to produce recycled paper 8 having high whiteness.

(3) Next, a case where recycled paper 7 is recycled to produce recycled paper 8 having low whiteness will be described below. In addition, the content which overlaps with description in the case of manufacturing the recycled paper 8 which has the standard whiteness described in said (1) is abbreviate | omitted.

In this case, the user presses the low whiteness selection button 102 (S-5), and inputs the used paper 7 from the used paper input unit 11 of the used paper pulp manufacturing apparatus 2 as shown in FIG. As a result, the control unit 97 executes the low deinking process in the deinking apparatus 3 in which the degree of deinking is lower than the standard level as follows (S-6).

That is, as shown in FIG. 4, the control unit 97 opens the first supply solenoid valve 51a and the third supply solenoid valve 51c, and the second supply solenoid valve 51b and the fourth supply solenoid valve. The valve 51d is closed, and the rotational speed of the first pump 56 is controlled to a high rotational speed RH higher than the standard rotational speed R, and the rotational speeds of the charging pump 63 and the

air pumps

49a and 49b are respectively standard rotational speeds. Control is made at a low rotational speed RL lower than the speed R.

Thus, the residence time becomes a shortened residence time TS (that is, TS <T) shorter than the standard residence time T. Further, the addition amount of the deinking agent 58 added to the recycled pulp containing liquid 37 becomes the second addition amount A2 (that is, A2 <A) which is smaller than the standard addition amount A. Further, since the bubbles 45 are ejected from the first bubble generating member 47a and the third bubble generating member 47c into the recycled pulp-containing liquid 37 in the deinking tank 39, the bubbles 45 are ejected from the recycled pulp-containing liquid 37 in the deinking tank 39. The amount of air diffused becomes the second amount of air diffused B2 that is smaller than the standard amount of air diffused B (that is, B2 <B). As a result, low deinking processing can be performed (S-6).

When the low deinking process as described above is completed, paper is made in the paper making device 4 and finished by the finishing device 5 to produce recycled paper 8 having low whiteness.

(4) Next, the case where the recycled paper 8 is manufactured by performing the saving operation regardless of the whiteness of the recycled paper 8 will be described below. In addition, the content which overlaps with description in the case of manufacturing the recycled paper 8 which has the standard whiteness described in said (1) is abbreviate | omitted.

In this case, the user presses the saving operation selection button 103 (S-7), and inputs the used paper 7 from the used paper input unit 11 of the used paper pulp manufacturing apparatus 2 as shown in FIG. As a result, the control unit 97 executes the saving operation as follows (S-8).

That is, as shown in FIG. 4, the control unit 97 drives the first pump 56 and the dilution pump 108, opens the second switching electromagnetic valve 86 and the dilution electromagnetic valve 109, and opens the second pump 81. The charging pump 63 and the

air pumps

49a and 49b are stopped, the first switching solenoid valve 85, the closing solenoid valve 64, and the first to fourth air supply solenoid valves 51a to 51d are closed, and further, for water injection The pump 60d is stopped and the water injection solenoid valve 60e is closed.

Thereby, the addition of the deinking agent 58 by the deinking agent adding device 59 and the injection of the diluted water 60 a by the regenerated pulp diluting device 60 are stopped, and the regenerated pulp-containing liquid 37 in the stirring tank 32 is transferred from the transfer pipe 55. The paper is supplied to the head box 66 of the papermaking apparatus 4 through the bypass transfer pipe 83. At this time, since the white water 79 in the white water tank 72 is supplied to the bypass transfer pipe 83 through the dilution pipe 107, the pulp concentration of the recycled pulp-containing liquid 37 (used paper raw material liquid) flowing through the bypass transfer pipe 83 is reduced. Is diluted with white water 79 to a predetermined pulp concentration (for example, about 0.5%), supplied to the head box 66, and made by the paper making apparatus 4.

If papermaking has not yet been performed and the white water 79 is not stored in the white water tank 72, tap water is stored in advance in the white water tank 72 instead of the white water 79.

In this way, the recycled pulp-containing liquid 37 obtained in the stirring tank 32 of the pulper 17 is not deinked in the deinking tank 39 (S-8), and is made in the papermaking apparatus 4, so that the deinking process is performed. Electric power required (that is, electric power for driving the second pump 81, the input pump 63, the

air pumps

49a and 49b, and the water injection pump 60d) can be saved, and the time required for the deinking process can be saved. Therefore, the waste paper recycling processing time required for manufacturing the recycled paper 8 from the waste paper 7 is shortened, and further, the usage amount of the deinking agent 58 and the usage amount of the dilution water 60a are reduced. In addition, the amount of recycled pulp discharged as garbage along with the printing components during the deinking process is reduced, and the recycled pulp can be effectively used as a raw material for the recycled paper 8, so that eco-friendly saving operation can be performed. .

In the above embodiment, as shown in FIG. 8, all of the transfer device 54, the deinking agent adding device 59, and the air diffuser 46 are controlled according to the whiteness selected by the selection buttons 100 to 102. However, at least one of these three deinking devices is controlled, whereby at least one of the three deinking conditions of the residence time, the amount of deinking agent 58 added, and the amount of air diffused is controlled. The deinking state may be adjusted by one.

In the above embodiment, as shown in FIG. 5, the first to fourth bubble generating members 47a to 47d are provided at the bottom of the deinking tank 39, but the number of bubble generating members 47a to 47d is limited to four. It may be a plurality or a single number other than four. The number of

air pumps

49a and 49b and the number of supply pipes 50a to 50d are the same.

Further, during the standard deinking process, the first to third bubble generating members 47a to 47c are diffused using all three, and during the high deinking process, all of the first to fourth bubble generating members 47a to 47d are used. In the low deinking process, air is diffused using only the first and third

bubble generating members

47a and 47c, but the bubbles used in each of these deinking processes The number of generating members and the locations where bubbles are generated are not limited to those described above. The number of bubble generating members used in the high deinking process is more than the number of bubble generating members used in the standard deinking process. The number of bubble generating members used in the low deinking process may be smaller than the number of bubble generating members used in the standard deinking process.

Further, although the first to fourth bubble generating members 47a to 47d are formed in a flat plate shape, the present invention is not limited to the flat plate shape, and for example, a rotatable cylindrical air diffuser tube or the like may be used.

As described above, in the above embodiment, the number of the bubble generating members 47a to 47d to which air is supplied is changed according to the degree of the deinking process, thereby controlling the amount of air diffused by the air diffuser 46. However, the amount of air diffused by the air diffuser 46 may be controlled by adjusting at least one of the pressure, flow velocity, and supply time of the air supplied to the bubble generating members 47a to 47d.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIGS.

The pulper 17 is provided with a coloring degree detection device 42 for detecting the coloring degree of the recycled pulp-containing liquid 37 in the stirring tank 32. Note that the coloring degree detection device 42 uses an imaging device such as an area CCD image sensor, a line CCD image sensor, or a CNOS image sensor. Further, the higher the printing rate of the used paper 7, the deeper the coloring degree, and the lower the printing rate, the lighter the coloring degree.

Based on the detection value of the coloring level detection device 42, the detection value of the water level meter 53, and the ON / OFF operation of each of the selection buttons 100 to 103, the control unit 97 sets the

pumps

49a, 49b, 56, 60d, 63, 81 and 108 and the solenoid valves 51a to 51d, 60e, 64, 85, 86 and 109 are controlled. The control unit 97 controls the rotational speeds of the

pumps

49a, 49b, 56, 63 to a plurality of rotational speeds as shown in FIG.

In addition, a predetermined standard color degree range, a light color range that is lighter than the standard color degree range, and a dark color range that is darker than the standard color degree range are set in the control unit 97 in advance. The coloring degree detected by the coloring degree detection device 42 is classified by the control unit 97 so as to belong to any one of the standard coloring degree range, the light coloring degree range, and the deep coloring degree range.

Hereinafter, the operation of the above configuration will be described.

When the pulper 17 performs the disaggregation process, the coloring degree of the recycled pulp-containing liquid 37 in the stirring tank 32 is detected by the coloring degree detection device 42, and the detected coloring degree includes the standard coloring degree range, the light coloring degree range, and the darkness. It is classified into any range of the coloring degree range.

(1) For example, when the detected coloring degree belongs to the standard coloring degree range, the control unit 97 performs the same standard deinking process, high deinking process, low deinking process and saving operation as in the first embodiment. And selectively execute.

(2) Further, when the detected coloring degree belongs to the deep coloring degree range, in the standard deinking process, the rotation speed of the first pump 56 is a predetermined ratio (for example, 10%) from the standard rotation speed R. The low standard rotation speed R1 is controlled, and the rotation speeds of the input pump 63 and the

air pumps

49a and 49b are controlled to a high standard rotation speed R2 higher than the standard rotation speed R by a predetermined ratio (for example, 10%). To do. The low standard rotation speed R1 is higher than the low rotation speed RL, and the high standard rotation speed R2 is lower than the high rotation speed RH.

As a result, the residence time is corrected to be longer than the standard residence time T by a predetermined time, the addition amount of the deinking agent 58 is corrected to be increased by a predetermined amount from the standard addition amount A, and the amount of aeration is increased. Correction is made to increase by a predetermined amount from the standard air diffusion amount B. For this reason, the standard deinking process is promoted, and even with the used paper 7 having a printing rate higher than the standard, the whiteness is not insufficient, and the recycled paper 8 having a predetermined standard whiteness can be stably manufactured. .

(3) When the detected coloring degree belongs to the light coloring degree range, in the standard deinking process, the rotation speed of the first pump 56 is a predetermined ratio (for example, 10%) from the standard rotation speed R. The high standard rotation speed R2 is controlled so that the rotation speeds of the input pump 63 and the

air pumps

49a and 49b are lower than the predetermined standard rotation speed R by a predetermined ratio (for example, 10%), respectively. To control.

Accordingly, the residence time is corrected to be shorter than the standard residence time T by a predetermined time, the addition amount of the deinking agent 58 is corrected to be reduced by a predetermined amount from the standard addition amount A, and the amount of air diffused is reduced. Correction is made so as to decrease by a predetermined amount from the standard air diffusion amount B. For this reason, the standard deinking process is suppressed, and even when the used paper 7 has a printing rate lower than the standard, the whiteness does not become excessive, and the recycled paper 8 having a predetermined standard whiteness can be manufactured stably. it can.

(4) When the detected coloring degree belongs to the deep coloring degree range, in the high deinking process, the rotation speed of the first pump 56 is a predetermined ratio (for example, 10%) than the low rotation speed RL. The first high rotational speed RH1 is controlled to a low first low rotational speed RL1, and the rotational speeds of the charging pump 63 and the

air pumps

49a and 49b are respectively higher than the high rotational speed RH by a predetermined ratio (for example, 10%). To control.

Accordingly, the residence time is corrected to be longer than the extended residence time TL by a predetermined time, and the addition amount of the deinking agent 58 is corrected to be increased by a predetermined amount from the first addition amount A1, and the amount of air diffused is corrected. Is corrected so as to increase by a predetermined amount from the first air diffusion amount B1. Therefore, the high deinking process is promoted, and even when the used paper 7 has a printing rate higher than the standard, the whiteness is not insufficient, and the recycled paper 8 having a predetermined high whiteness can be stably manufactured. .

(5) Further, when the detected coloring degree belongs to the light coloring degree range, in the high deinking process, the rotation speed of the first pump 56 is a predetermined ratio (for example, 10%) than the low rotation speed RL. The second high rotational speed RH2 is controlled to a high second low rotational speed RL2, and the rotational speeds of the charging pump 63 and the

air pumps

49a, 49b are respectively lower than the high rotational speed RH by a predetermined ratio (for example, 10%). To control. The second low rotation speed RL2 is lower than the standard rotation speed R, and the second high rotation speed RH2 is higher than the standard rotation speed R.

As a result, the residence time is corrected to be shorter than the extended residence time TL by a predetermined time, the addition amount of the deinking agent 58 is corrected to be reduced by a predetermined amount from the first addition amount A1, and the amount of air diffused. Is corrected so as to decrease by a predetermined amount from the first air diffusion amount B1. For this reason, even if the waste paper 7 has a high deinking process and the printing rate is lower than the standard, the whiteness does not become excessive, and the recycled paper 8 having a predetermined high whiteness can be stably manufactured. it can.

(6) When the detected coloring degree belongs to the deep coloring degree range, in the low deinking process, the rotational speed of the first pump 56 is a predetermined ratio (for example, 10%) from the high rotational speed RH. The second low rotational speed RL2 is controlled to a low second high rotational speed RH2, and the rotational speeds of the input pump 63 and the

air pumps

49a, 49b are respectively higher than the low rotational speed RL by a predetermined ratio (for example, 10%). To control.

Accordingly, the residence time is corrected to be longer than the shortened residence time TS by a predetermined time, and the addition amount of the deinking agent 58 is corrected to be increased by a predetermined amount from the second addition amount A2, and the amount of air diffused is corrected. Is corrected so as to increase by a predetermined amount from the second air diffusion amount B2. For this reason, the low deinking process is promoted, and even with the used paper 7 having a printing rate higher than the standard, the whiteness is not insufficient, and the recycled paper 8 having a predetermined low whiteness can be stably manufactured. .

(7) When the detected coloring degree belongs to the light coloring degree range, in the low deinking process, the rotation speed of the first pump 56 is set by a predetermined ratio (for example, 10%) from the high rotation speed RH. The first low rotational speed RL1 is controlled to a high first high rotational speed RH1, and the rotational speeds of the charging pump 63 and the

air pumps

49a and 49b are respectively lower than the low rotational speed RL by a predetermined ratio (for example, 10%). To control.

Accordingly, the residence time is corrected to be shorter than the shortened residence time TS by a predetermined time, and the addition amount of the deinking agent 58 is corrected to be reduced by a predetermined amount from the second addition amount A2, and the amount of air diffused is corrected. Is corrected so as to decrease by a predetermined amount from the second air diffusion amount B2. For this reason, even if the waste paper 7 has a low deinking process and the printing rate is lower than the standard, the whiteness does not become excessive, and the recycled paper 8 having a predetermined low whiteness can be stably manufactured. it can.

In the above embodiment, the coloring degree of the recycled pulp-containing liquid 37 in the stirring tank 32 of the pulper 17 is detected by the coloring degree detection device 42. However, the plurality of waste papers 7 are conveyed one by one and the pulper 17 When thrown into the agitation tank 32, the printing rate of each used paper 7 may be detected by a printing rate detection device (an imaging device such as an area CCD image sensor, a line CCD image sensor, or a CNOS image sensor).

(Third embodiment)
Hereinafter, a third embodiment of the present invention will be described with reference to FIG.

Between the white water tank 72 and the transfer pipe 55, a white water supply device 111 for supplying white water 79 in the white water tank 72 to the deinking tank 39 is provided. The white water supply device 111 includes a white water supply pipe 112 connected between the white water tank 72 and the middle of the transfer pipe 55, a white water supply pump 113 provided in the white water supply pipe 112, and a white water supply pipe. And an electromagnetic valve 114.

Hereinafter, the operation of the above configuration will be described.

When performing the deinking process, the recycled pulp-containing liquid 37 in the stirring tank 32 is introduced into the deinking tank 39 through the transfer pipe 55. At this time, the water level of the recycled pulp-containing liquid 37 in the deinking tank 39 is detected by the water level meter 53, and the control unit 97 drives the white water supply pump 113 and opens the white water supply electromagnetic valve 114.

Thus, the white water 79 in the white water tank 72 is supplied to the transfer pipe 55 through the white water supply pipe 112 and flows into the deinking tank 39 together with the recycled pulp-containing liquid 37 in the transfer pipe 55. Thereby, it is possible to save the amount of diluted water used by the tap water required until the water level in the deinking tank 39 reaches the predetermined water level W.

Further, even after the water level in the deinking tank 39 reaches the predetermined water level W, the white water 79 in the white water tank 72 is continuously supplied to the deinking tank 39 as described above, so that the white water 79 is replaced with the tap water. Since the recycled pulp-containing liquid 37 can be diluted by using, it is possible to further save the amount of dilution water used using tap water.

Thereby, the regenerated pulp diluting device 60 (see FIGS. 4 and 9) using the tap water shown in the first and second embodiments is not necessary.

In each of the above embodiments, as shown in FIG. 5, two partition walls 43 are provided in the deinking tank 39, and the deinking tank 39 is divided into three deinking chambers 44a to 44c. A plurality of partition walls 43 may be provided, and three or more deinking chambers may be formed. Further, one partition wall 43 may be provided to form two deinking chambers.

In each of the above embodiments, when the recycled paper 8 having the standard whiteness is manufactured, the standard whiteness selection button 100 is always pressed. However, even if the standard whiteness selection button 100 is not pressed, It may be controlled to operate the start of the used paper recycling process and automatically select a course of standard whiteness if there is no other selection.

In each of the above embodiments, as shown in FIGS. 4, 9, and 11, as an example of the whiteness selection operation unit, the standard whiteness selection button 100, the high whiteness selection button 101, and the low whiteness The selection button 102 is provided to select three levels of whiteness, but is not limited to three levels. The number of whiteness selection buttons can be increased or decreased to provide two levels or four or more levels. A plurality of levels of whiteness may be selectable.

Further, as an example of the whiteness selection operation unit, the whiteness selection buttons 100 to 102 are used. However, the present invention is not limited to such push buttons, and a switch, a touch panel, or the like may be used.

In each of the above embodiments, as shown in FIGS. 4, 9, and 11, when the water level detected by the water level gauge 53 reaches the predetermined water level W, the second pump 81 is driven to deink the tank 39. The deinked pulp-containing liquid is continuously discharged from the outflow part 41, but the inflow of liquid from the inflow part 40 to the inside of the deinking tank 39 and the liquid from the outflow part 41 to the outside of the deinking tank 39. May be temporarily stopped and deinked in a batch manner for a predetermined time, or the residence time may be adjusted by the batch processing time.

In each of the above embodiments, as shown in FIGS. 4, 9, and 11, the operation panel 96 is provided with both the whiteness selection device 98 and the saving operation selection device 99, but only one of them is provided. May be.

In each of the above embodiments, the deinking agent adding device 59 is provided in the deinking device 3 as shown in FIGS. 4, 9, and 11, but may be provided in the pulper 17. When the pulper 17 is provided, the deinking agent 58 can be sufficiently dissolved in the recycled pulp-containing liquid 37 by the stirring blade 35. In this case, in addition to the control based on the rotation speed, the input pump 63 can also control the input amount of the deinking agent 58 to the pulper 17 by adjusting the drive time while keeping the rotation speed constant.

In each of the above embodiments, as shown in FIGS. 4, 9 and 11, the upstream end of the bypass transfer pipe 83 is connected to the middle of the transfer pipe 55. You may connect to the stirring tank 32 of the pulper 17.

Claims

Waste paper recycling treatment comprising a pulper that stirs and separates waste paper with water, a deinking tank that separates the printing components by aeration into the waste paper raw material liquid obtained in the pulper, and a papermaking device that makes the waste paper raw material paper A device,
At least one of a whiteness selection device for selecting the whiteness of the recycled paper to be produced from a plurality of different whitenesses and a saving operation selection device for selecting a saving operation, and a control unit,
When the predetermined whiteness is selected by the whiteness selection device, the control unit adds the residence time in which the used paper raw material liquid stays in the deinking tank and the deinking added to the used paper raw material liquid according to the selected whiteness. When at least one deinking condition of the amount of agent added and the amount of air diffused into the deinking tank is controlled and the saving operation is selected by the saving operation selection device, the waste paper raw material liquid obtained in the pulper is removed. A used paper recycling apparatus characterized by being controlled so as to be supplied to a papermaking apparatus without passing through an ink tank.
A whiteness selection device, a saving operation selection device, a transfer device that transfers the used paper raw material liquid in the pulper to the deinking tank, and a bypass transfer device that transfers the used paper raw material solution in the pulper to the papermaking device,
When the whiteness is selected by the whiteness selection device, the controller controls the transfer device to transfer the used paper raw material liquid from the pulper to the deinking tank, and when the saving operation is selected by the saving operation selection device, 2. The used paper recycling apparatus according to claim 1, wherein the used paper raw material liquid is controlled to be transferred from the pulper to the papermaking apparatus by a bypass transfer device.
A detection device is provided to detect the printing rate of used paper that is put into the pulper or the degree of coloring of the used paper raw material liquid in the pulper.
The control unit controls at least one deinking condition of the residence time, the addition amount of the deinking agent, and the amount of aeration according to the selected whiteness and the detection value detected by the detection device. The used paper recycling apparatus according to claim 1.
The whiteness selection device includes a whiteness selection operation unit corresponding to a plurality of different whiteness levels.
2. The used paper recycling apparatus according to claim 1, wherein the saving operation selection device comprises an operation unit for saving operation selection.