JP2018109247A - Regenerated pulp production apparatus and waste paper regeneration apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a regenerated pulp production apparatus capable of stabilizing a thickness of a recycled paper as a product by taking out a recycled pulp containing liquid having a desired fiber concentration from a stirring chamber, and a waste paper regeneration apparatus equipped with the regenerated pulp production apparatus.SOLUTION: The apparatus has a regenerated pulp containing liquid take-out portion that is protruded on a bottom portion of a stirring chamber, and that discharges the regenerated pulp containing liquid including the regenerated pulp to outside of the chamber of the stirring chamber.SELECTED DRAWING: Figure 3

Description

The present invention relates to a recycled pulp manufacturing apparatus and a used paper recycling processing apparatus.

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

   Therefore, Patent Document 1 below discloses a technique related to a used paper processing apparatus that can reduce the size of the apparatus and process used paper at a paper consumption place. The pulper unit in the used paper processing apparatus includes a stirring tank, a water supply unit, a stirring unit, a recycled pulp-containing liquid extraction unit, and the like. The recycled pulp-containing liquid take-out section is provided at the bottom of the stirring tank, and the recycled pulp-containing liquid containing recycled pulp, water, etc. produced by disaggregating used paper raw materials in the pulper section is taken out from the stirring tank. It is like that. The recycled pulp-containing liquid take-out section is connected to a pipe equipped with an on-off valve and a pump outside the stirring tank, and the regenerated pulp-containing liquid taken out from the recycled pulp-containing liquid take-out section by the pump is deinked or paper-made. To send to.

JP 2011-219893 A

In the regenerated pulp manufacturing apparatus, the pulper unit has a stirrer tank and a stirrer provided in the stirrer tank, and recycles the waste paper to produce a regenerated pulp-containing liquid containing regenerated pulp. The agitation tank has a regenerated pulp-containing liquid take-out part that discharges the regenerated pulp-containing liquid to the outside of the tank, and a transfer part is connected to the regenerated pulp-containing liquid take-out part. A transfer part transfers the recycled pulp containing liquid disaggregated by the stirring tank to a deinking part or a papermaking part. The stirring tank rotates the stirring blade to stir the regenerated pulp-containing liquid, and drives the tube pump of the transfer section to take out the regenerated pulp-containing liquid disaggregated in the stirrer tank from the regenerated pulp-containing liquid take-out part of the stirring tank. , Transport to deinking section or papermaking section.

In the pulper part, since the reclaimed pulp-containing liquid take-out part provided at the bottom of the stirring tank is provided with an opening in a flat state at the bottom, a vortex with a low fiber concentration accumulated at the bottom of the stirring tank is provided. There is a problem that the recycled pulp-containing liquid is taken out from the non-convection area and does not match the calculated fiber concentration depending on the situation, and as a result, the thickness of the recycled paper as a product becomes thinner than expected.

The present invention solves the above-mentioned problems, and when a recycled pulp-containing liquid that has been disaggregated in a stirring tank is transferred to a deinking section or a papermaking section, the recycled pulp-containing liquid having a desired fiber concentration is taken out from the stirring tank. An object of the present invention is to provide a recycled pulp production apparatus capable of stabilizing the thickness of recycled paper as a product, and a used paper recycling processing apparatus equipped with the recycled pulp production apparatus.

In order to solve the above-mentioned problem, the invention according to claim 1 includes a pulper unit that stirs a used paper raw material together with water supplied from a water supply unit with a stirring blade in a stirring tank, and produces recycled pulp. A regenerated pulp-containing liquid take-out unit that protrudes from the bottom of the agitation tank and discharges the regenerated pulp-containing liquid containing the regenerated pulp to the outside of the agitation tank. Is provided.

The invention according to claim 2 is the regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid take-out section is constituted by a pipe projecting from the bottom of the stirring tank. It is.

The invention according to claim 3 is the regenerated pulp-containing liquid, wherein the regenerated pulp-containing liquid take-out section takes in the regenerated pulp-containing liquid at the upper end in the regenerated pulp manufacturing apparatus according to claim 1 or claim 2. A structure having a take-in port and projecting a predetermined amount from the bottom of the stirring vessel so that the recycled pulp-containing liquid intake port reaches a convection region of a vortex generated by rotation of a stirring blade in the stirring vessel It is characterized by that.

Furthermore, the invention according to claim 4 is the regenerated pulp manufacturing apparatus according to claim 1, wherein the regenerated pulp-containing liquid take-out part is a bottom part of a stirring tank, and a rotation region of the stirring blades It is characterized in that it is installed in a range outside and a predetermined amount inside from the side wall of the stirring tank.

Furthermore, the invention according to claim 5 is the regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid is connected to the reclaimed pulp-containing liquid take-out section, and the regenerated pulp-containing liquid in the stirring tank is used in the next step. It is characterized by including a transfer part for transferring.

  Further, the invention according to claim 6 is the recycled pulp manufacturing apparatus according to claims 1 to 5, wherein the residual liquid remaining in the stirring tank is discharged to the outside of the stirring tank at the bottom of the stirring tank. And a residual liquid discharge part for discharging the residual liquid, wherein the residual liquid discharge part has a residual liquid intake for discharging the residual liquid at a position lower than the protruding height of the recycled pulp-containing liquid discharge part. It is what.

Furthermore, the invention according to claim 7 is the regenerated pulp manufacturing apparatus according to claim 6, wherein the residual liquid discharge part has an on-off valve that can arbitrarily open and close the drainage path, and the control part is a stirring tank In the disaggregation process, the on-off valve is controlled to be closed, and after the disaggregation process, the on-off valve is controlled to be opened when the residual liquid is discharged and discarded.

  Furthermore, the invention according to claim 8 is the regenerated pulp manufacturing apparatus according to claim 7, further comprising a lower limit liquid level detection sensor capable of detecting a lower limit liquid level of the regenerated pulp-containing liquid stored in the stirring tank. When the lower limit liquid level detection sensor detects that the liquid level of the recycled pulp-containing liquid is equal to or less than the installation height of the stirring blade, the residual liquid is discharged from the residual liquid discharge unit and discarded. It is characterized by controlling to.

  Furthermore, the invention according to claim 9 is the regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid take-out part is constituted by a pipe projecting 10 mm or more from the bottom of the stirring tank. It is a feature.

Furthermore, the invention described in claim 10 is a used paper recycling apparatus provided with the recycled pulp manufacturing apparatus described in any one of claims 1 to 9.

As described above, according to the present invention, by providing the regenerated pulp-containing liquid take-out portion that protrudes from the bottom of the stirring tank and discharges the regenerated pulp-containing liquid containing the regenerated pulp to the outside of the stirrer tank, The regenerated pulp-containing liquid corresponding to the calculated fiber concentration can be taken out from the convection region of the vortex, avoiding the vortex non-convection region having a low fiber concentration at the bottom of the vortex. As a result, the thickness of the recycled paper as a product is stabilized.

Furthermore, by providing a residual liquid discharge section at a position lower than the projecting height of the recycled pulp-containing liquid extraction section at the bottom of the stirring tank, separately from the recycled pulp-containing liquid extraction section, the protruding portion of the recycled pulp-containing liquid extraction section is provided. Residual water remaining at a position lower than the installation height can be discharged (discarded) outside the stirring tank, and is not affected by residual pulp or dust during the next disaggregation treatment.

The block diagram which shows the used paper reproduction | regeneration processing apparatus in embodiment of this invention Sectional drawing which shows the pulper part of the used paper reproduction | regeneration processing apparatus in the 1st Embodiment of this invention Schematic diagram showing the occurrence of convection area and non-convection area of vortex flow in the stirring tank Plan view of stirring tank 901 AA arrow sectional view of FIG. List of concentration measurement results of recycled pulp-containing liquid in the stirring tank Sectional drawing which shows the pulper part of the used paper reproduction | regeneration processing apparatus in the 2nd Embodiment of this invention

(Overall configuration of used paper recycling processing equipment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the used paper recycling processing apparatus has a plurality of processing units constituting a used paper recycling processing system. The processing units include a used paper feeding unit 1, a pulper unit 9, a deinking unit 11, a paper making unit. There are a section 13, a drying section 14, a finishing section 15, a paper receiving section 63, and a white water tank section 100. In addition, the used paper recycling apparatus includes a control unit 700 that controls the operation of each processing unit.

  The used paper input unit 1 inputs recycled paper used as a raw material to the pulper unit 9, and inputs the used paper to the pulper unit 9 in a state of being cut or cut. The pulper unit 9 has a stirring tank 901 and a stirring device 92 provided in the stirring tank 901, and produces a recycled pulp-containing liquid containing regenerated pulp by disaggregating waste paper.

  The deinking unit 11 prepares deinked pulp by deinking the recycled pulp-containing liquid, and includes a deinking tank 501, a bubble discharge device 601 that discharges bubbles from the bottom of the deinking tank 501, and a bubble discharge An air supply device (such as an air pump) 602 that supplies air to the device 601 is provided. The bubble releasing device 601 is arranged at the bottom of the deinking tank 501 and is composed of a porous air stone or the like having air permeability, and the upper surface is formed as a bubble releasing surface.

The paper making unit 13 is for producing wet paper by dehydrating the pulp mixture liquid deinked in the deinking unit 11. The drying unit 14 is for drying the dehydrated wet paper into recycled paper.
The finishing unit 15 performs a finishing process on the recycled paper, and discharges the obtained recycled paper to the paper receiving unit 63.
The white water tank unit 100 stores white water, which is wastewater containing recycled pulp flowing in from the paper making unit 13, and returns the white water to various parts of the used paper recycling system through the white water return systems 105 and 106. A water supply source, here, a water supply pipe 108 for supplying water from a water supply pipe 107 is connected to the white water tank 100, and a main valve device 109 for emergency stop including an electromagnetic valve is provided in the water supply pipe 108.

(Basic configuration of the pulper unit)
As shown in FIG. 2, the used paper input unit 1 is located above the stirring tank 901 of the pulper unit 9, and inputs the recycled paper used as a raw material directly into the pulper unit 9 as a sheet. The used paper feeding unit 1 has a posture holding unit 203 that holds a sheet in a standing posture, and the posture holding unit 203 is composed of a rectangular frame that is open and closed with an upper opening and a lower opening, and forms a loading unit. The lower opening faces the upper opening of the stirring tank 901. A slide bottom plate 206 forming the bottom of the posture holding unit 203 covers a lower opening of the posture holding unit 203, and the slide bottom plate 206 is movable in a sliding direction for opening and closing the lower opening.

In order to ensure safety for the user, a cover part 301 is provided to cover the upper opening of the posture holding part 203, and the cover part 301 includes a transparent door body 302.
In the present embodiment, the agitation tank 901 of the pulper unit 9 will be described as a storage part, but the present invention can also be applied to a case where a storage tank or a deinking tank provided separately is used as the storage part.
The pulper unit 9 has a stirring blade 902 as a stirring device and a rotating shaft 903 that rotationally drives the stirring blade 902 as a stirring device inside a stirring tank 901 serving as a storage unit. The rotary shaft 903 is pivotally supported by two upper and lower bearings 904 and 905 that are pivotally attached to the bottom of the tank and disposed above the stirring tank 901, and has a pulley 906 between the upper and lower bearings 904 and 905. The pulley 906 is driven by a motor (not shown) via the belt 907, whereby the rotating shaft 903 and the stirring blade 902 rotate.

  The agitation tank 901 has a recycled pulp-containing liquid extraction unit 908 at the bottom of the tank, and a transfer unit 909 is connected to the recycled pulp-containing liquid extraction unit 908. The transfer unit 909 forms a transfer path for transferring the recycled pulp-containing liquid disaggregated in the stirring tank 901 to the deinking unit 11 and includes a tube pump 910 as a transfer pump. The transfer pump is not limited to the tube pump 910, and a snake pump, a Mono pump, a screw pump, etc. can be used, but by using the tube pump 910, the transfer amount of the regenerated pulp-containing liquid can be accurately grasped, There is no need to install a separate flow meter, which can contribute to cost reduction.

  A water supply part 911 provided facing the opening of the stirring tank 901 supplies dilution water to the stirring tank 901, and the white water return system 106 is connected to the water supply part 911. Further, a white water return system 105 is connected to the transfer unit 909 as a second water supply unit at a downstream position of the tube pump 910.

  Inside the agitation tank 901, as a liquid level sensor for detecting the liquid level of the recycled pulp-containing liquid, an upper limit liquid level detection sensor 912 corresponding to the upper limit liquid level that can be stored in the tank, and an agitation blade 902 in the tank A lower limit liquid level detection sensor 913 corresponding to the position and a specified remaining liquid level detection sensor 914 corresponding to the specified remaining liquid level when a predetermined amount of the recycled pulp-containing liquid is stored are provided.

  The operation of the above configuration will be described below. The control unit 700 controls the used paper input unit 1, the pulper unit 9, the deinking unit 11, the paper making unit 13, the drying unit 14, the finishing unit 15, the white water tank unit 100, and the deinking waste liquid processing apparatus 101. The waste paper recycling system is operated at.

  The slide bottom plate 206 of the used paper input unit 1 is disposed at the fully closed position, and in this state, the door body 302 of the cover unit 301 is opened, and a bundle of sheets is mounted in the frame body of the posture holding unit 203. The slide bottom plate 206 is moved in the opening direction of the sliding direction, and the lower opening of the posture holding unit 203 is opened. The sheets are sequentially dropped from the lower opening into the stirring tank 901 of the pulper unit 9 while keeping the posture as the slide bottom plate 206 is opened.

  The agitation tank 901 stores a predetermined amount of white water supplied from the water supply unit 911 as disaggregation water, rotates the agitation blade 902, disaggregates the waste paper input from the waste paper input unit 1, and regenerates it. A pulp-containing liquid is produced. And the dilution water which is insufficient with respect to the used waste paper amount is supplied from the water supply part 911, and a recycled pulp containing liquid is adjusted to a predetermined density | concentration.

  Next, while rotating the stirring blade 902 to stir the regenerated pulp-containing liquid, the tube pump 910 of the transfer section 909 is driven to take out the regenerated pulp-containing liquid from the regenerated pulp-containing liquid take-out section 908 of the stirring tank 901 and remove it. The ink is transferred to the ink section 11. The control unit 700 detects that the regenerated pulp-containing liquid in the tank has decreased to the specified remaining amount by detecting the specified remaining liquid level detection sensor 914 that the liquid level in the tank has reached the specified remaining liquid level. The dilution water is supplied to the stirring tank 901 from the water supply unit 911. For example, the specified remaining liquid level is set to a level at which 50 L of recycled pulp-containing liquid remains in the tank, and when the specified remaining liquid level detection sensor 914 detects the specified remaining liquid level, the water supply unit 911 dilutes by 5 L. Supply water. During this time, the transfer of the recycled pulp-containing liquid by the tube pump 910 is continued. When the liquid level in the stirring tank 901 reaches the specified remaining liquid level, 5 L of dilution water is supplied again, and this operation is repeated.

Thereafter, when the liquid level in the stirring tank 901 is lowered, the lower limit liquid level detection sensor 913 detects the lower limit liquid level (corresponding to the position of the stirring blade 902 in the tank), and the stirring blade 902 is exposed. , Since the concentration of the recycled pulp-containing liquid cannot be sufficiently performed and the concentration of the recycled pulp-containing liquid becomes unstable (the state in which the solid waste paper pulp and the liquid phase are not sufficiently mixed) The rotation is stopped, the disaggregation process is finished, the paper making operation of the paper making unit 13 is stopped, and the supply of white water from the white water return system 105 to the transfer unit 909 by a self-priming supply pump (not shown) is also stopped. (Mixing in the transfer unit 909 is also stopped). In this state, the transfer of the recycled pulp-containing liquid by the tube pump 910 continues, and the pulp-containing liquid corresponding to the lower limit liquid level is discarded outside the apparatus through a drainage path (not shown) from the deinking unit 11.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the basic configuration of the above-described pulper unit, a regenerated pulp-containing liquid extraction unit 908 is provided at the bottom of the stirring tank 901 so as to protrude from the bottom and discharge a regenerated pulp-containing liquid containing regenerated pulp to the outside of the stirrer tank 901. Provided. The recycled pulp-containing liquid extraction unit 908 is constituted by, for example, a pipe projecting from the bottom of the stirring tank 901. The bottom portion of the stirring tank 901 is not limited to the bottom surface of the stirring tank 901, and may be the lower part of the side surface of the stirring tank 901.

FIG. 3 is a cross-sectional view showing a pulper portion of the used paper recycling apparatus. When the recycled pulp is produced in the agitation tank 901, when the used paper raw material is agitated by the agitation blade 902 in the agitation tank 901 together with the water supplied from the water supply unit 911, as shown in FIG. 3, as shown in FIG. By the rotation, a “convection region” 81 of the vortex 80 is generated at the center in the stirring tank 901. Further, a “non-convection region” 82 is generated outside the convection region.

FIG. 4 is a plan view of the agitation tank 901. The stirring blade 902 includes a protruding portion 915 made of another member, and an upper surface and a lower surface are formed in parallel with the horizontal plane. 5 is a cross-sectional view taken along the line AA in FIG. As shown in FIG. 5, the cross-sectional shape of the protrusion 915 is formed in a trapezoid whose upper part protrudes in the direction opposite to the rotation direction R during the disaggregation process. The protruding portion 915 is installed at a predetermined position on the upper surface of the stirring blade 902 and is fixed by a screw 916 from below. As shown in FIG. 4, the “convection region” 81 of the vortex is generated in the central portion in the stirring tank 901 by the rotation of the stirring blade 902. Further, a “non-convection region” 82 is generated outside the convection region.

Specifically, there is a “non-convection region” 82 of the vortex 80 of about 10 mm near the bottom of the agitation tank 901 and in the vicinity of the side wall of the agitation tank 901, and the vortex generated by the rotation of the agitation blade 902 is inside thereof. A “convection region” 81 exists. In the “non-convection region” 82, the concentration of the waste paper pulp liquid is low, and a region with a color close to transparency can be visually confirmed. In the “convection area” 81, the concentration of the waste paper pulp liquid is higher than that of the “non-convection area” 82, and an area darker than the “non-convection area” 82 can be visually confirmed. In the actual measurement, 81 was confirmed to be close to the ideal calculated concentration (4%).

  In the stirring tank 901 in which the “convection region” 81 and the “non-convection region” 82 are generated by the rotation of the stirring blade 902, the tube pump 910 of the transfer unit 909 is driven while the recycled pulp-containing liquid is stirred by the stirring blade 902. When the regenerated pulp-containing liquid is taken out from the regenerated pulp-containing liquid take-out section 908 of the stirring tank 901 and transferred to the deinking section 11, the regenerated pulp-containing liquid take-out section 908 is flat at the bottom of the stir tank 901 as in the prior art. If an opening is provided in the state, waste paper pulp liquid is taken out from the “non-convection region” 82 of the low fiber concentration vortex 80 accumulated at the bottom of the stirring tank 901, and depending on the situation, the calculated fiber concentration and As a result, there is a problem that the thickness of the recycled paper as a product becomes thinner than expected.

  In the present invention, the regenerated pulp-containing liquid take-out portion 908 is constituted by, for example, a pipe having a regenerated pulp-containing liquid intake port 905 protruding from the bottom of the stirring tank 901, and the regenerated pulp-containing liquid intake port 905 is provided. Is configured to protrude from the bottom of the stirring tank 901 by a predetermined amount so as to reach the “convection region” 81 of the vortex 80 generated by the rotation of the stirring blade 902 in the stirring tank. In the plan view of the agitation tank in FIG. 4, the recycled pulp-containing liquid takeout part 908 is the bottom of the agitation tank 901, outside the rotating region of the agitation blade, and inside a predetermined amount from the side wall of the agitation tank. It is installed in the range.

The inner side (lower side) of the rotation region of the stirring blade 902 has a problem in maintainability from the upper part of the stirring tank, and the side wall of the stirring tank 902 has a “non-convection region” 82 of the vortex flow. There is a problem that the fiber concentration of the contained liquid is low. By avoiding both problem areas, the maintainability and the obtained concentration of the recycled pulp-containing liquid are in a good state. Therefore, the recycled pulp-containing liquid extraction unit 908 in the agitation tank 901 can extract the used paper pulp liquid from the “convection region” 81 close to the ideal calculated concentration (4%), and the recycled paper as a product can be extracted. Thickness can be stabilized.

Next, regarding the recycled pulp-containing liquid extraction part 908, how much the recycled pulp-containing liquid intake 905 can protrude from the bottom of the stirring tank 901 to reach the “convection region” 81 of the vortex 80 Tested. The test method measured the density | concentration of the reproduction | regeneration pulp containing liquid acquired from the reproduction | regeneration pulp containing liquid extraction part 908, respectively, changing the protruding height of the discharge pipe from the bottom part of the stirring tank 901 with 0, 10, 20 mm. . In addition, the measurement of a density | concentration is computed by the weight ratio (weight%) of the used paper pulp (what dried the used paper pulp in a used paper pulp liquid) with respect to the whole weight of the acquired used paper pulp liquid.

  FIG. 6 shows a list of the test results. From the result of the test, when the protruding height of the drain pipe (recycled pulp containing liquid extraction part 908) from the bottom of the stirring tank 901 is 10 mm or more, it becomes a concentration close to the ideal calculated fiber concentration (4%), It can be seen that the waste paper pulp liquid is taken out from the “convection region” 81 where the fiber concentration is stable.

From the above test results, the projecting height of the pipe (recycled pulp containing liquid extraction part 908) from the bottom of the stirring tank 901 was set to 10 mm in design. In terms of performance, the protruding height may be set to 20 mm, but since there is a problem that the recycled pulp-containing liquid cannot be drained from the stirring tank 901 after the pulp manufacturing operation (after the disaggregation treatment), as much as possible. A short setting is recommended. The height of the stirring blade 902 is set at a height of 30 mm from the bottom of the stirring tank 901. When the liquid level is lower than that, it cannot be sufficiently disaggregated. Drain out of the equipment and discard. The drainage (disposal) treatment of the recycled pulp-containing liquid after the pulp manufacturing operation will be described below in the second embodiment.

(Second Embodiment)
Hereinafter, a second embodiment of the present invention will be described with reference to FIG. As shown in FIG. 7, with respect to the bottom part of the stirring tank 901 in the first embodiment described above, residual liquid discharge for draining (disposing) the recycled pulp-containing liquid after the pulp manufacturing operation (after the disaggregation treatment) is performed. A portion 918 is further provided, and the residual liquid discharge portion 918 has a residual liquid intake port 919 at a position lower than the protruding height of the recycled pulp-containing liquid discharge portion 908. Therefore, the residual water remaining in the stirring tank 901 at a position lower than the protruding height of the recycled pulp-containing liquid extraction unit 908 can be discharged (discarded) out of the stirring tank by the residual liquid discharge unit 918 installed separately. Yes, and will not be affected by residual pulp or dust during the next disaggregation process.

The residual liquid discharge unit 918 has an on-off valve 917 that can arbitrarily open and close the drainage path, and the control unit controls the on-off valve 917 to be closed during the disaggregation process in the agitation tank. The on-off valve 917 is controlled to be opened when the water is drained and discarded. Therefore, the residual water can be discharged (discarded) out of the stirring tank at a predetermined timing.

  In addition, a lower limit liquid level detection sensor 913 capable of detecting the liquid level of the recycled pulp-containing liquid stored in the stirring tank 901 is provided, and the control unit has a liquid level of the recycled pulp-containing liquid equal to or lower than the installation height of the stirring blade 902. When the lower limit liquid level detection sensor 913 detects that it has become, the on-off valve 917 is opened, and control is performed so that the residual liquid is discharged from the residual liquid discharger 918 and discarded. Accordingly, the residual water that has become below the installation height of the stirring blade 902 can be automatically discharged (discarded) out of the stirring tank 901 by the residual liquid discharge unit 918 that is separately installed. It can be prevented from being affected by residual pulp or dust that is not sufficiently disaggregated.

When the water level of the pulp-containing liquid stored in the stirring tank 901 is equal to or less than the installation height of the stirring blade 902, a predetermined amount of white water is supplied from the water supply unit 911 to the stirring tank, and the residual liquid You may comprise so that residual water may be discharged | emitted from the discharge part 918 (discard). By doing so, white water can be discharged (discarded) out of the stirring tank while supplying white water from the water supply unit 911 to the residual water, and residual pulp, dust, and the like can also be washed away. Furthermore, the residual liquid discharge unit 918 may be configured to include a filtration unit as a foreign matter collection unit.

  Although the embodiment of the present invention has been described above, the specific configuration is not limited to this embodiment, and the present invention can be changed even if there is a design change without departing from the gist of the present invention. included. The shape of the tank body of the deinking unit 11 is not limited to a hexagonal shape, and may be formed in a cylindrical shape or a cylindrical shape in a plan view.

DESCRIPTION OF SYMBOLS 9 Pulper part 11 Deinking part 13 Paper making part 80 Eddy current 81 Convection area | region 82 Non-convection area | region 700 Control part 901 Stirrer tank 902 Stirring blade 903 Rotating shaft 904 Bearing 905 Regenerated pulp containing liquid extraction part 908 Regenerated pulp containing liquid extraction part 909 Transfer 910 Tube pump 911 Water supply part 912 Upper limit liquid level detection sensor 913 Lower limit liquid level detection sensor 914 Specified remaining liquid level detection sensor 915 Projection part 916 Screw 917 On-off valve 918 Remaining liquid discharge part 919 Remaining liquid intake port R Stirring Direction of blade rotation

Claims (10)

In the recycled pulp manufacturing apparatus comprising a pulper unit that stirs the used paper raw material together with water supplied from the water supply unit with a stirring blade in a stirring tank to manufacture recycled pulp, and a control unit that controls the operation of the pulper unit. An apparatus for producing regenerated pulp, characterized in that a regenerated pulp-containing liquid take-out part is provided that protrudes from the bottom of the agitation tank and discharges the regenerated pulp-containing liquid containing the regenerated pulp to the outside of the agitation tank. The regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid take-out part is constituted by a pipe projecting from the bottom of the stirring tank. The regenerated pulp containing liquid take-out part has a regenerated pulp containing liquid take-in port for taking in the regenerated pulp containing liquid at the upper end, and the regenerated pulp containing liquid take-in port is generated by rotation of a stirring blade in a stirring tank. The regenerated pulp manufacturing apparatus according to claim 1, wherein a predetermined amount protrudes from the bottom of the stirring tank so as to reach a convection region of the eddy current. The regenerated pulp-containing liquid take-out section is installed at a bottom portion of the stirring tank, outside the rotating region of the stirring blade and inside a predetermined amount from the side wall of the stirring tank. The regenerated pulp manufacturing apparatus of Claim thru | or 3. 5. The regenerated pulp manufacturing apparatus according to claim 1, further comprising a transfer unit that is connected to the regenerated pulp-containing liquid extraction unit and transfers the regenerated pulp-containing liquid in the stirring tank to the next step. The bottom part of the stirring tank is further provided with a residual liquid discharge part for discharging the residual liquid remaining in the stirring tank outside the tank of the stirring tank and discarding the residual liquid discharge part. The regenerated pulp manufacturing apparatus according to claim 1, further comprising a residual liquid intake port that discharges the residual liquid at a position lower than the protruding height of. The residual liquid discharge unit has an open / close valve that can arbitrarily open and close the drainage path, and the control unit controls the open / close valve to close during the disaggregation process in the agitation tank, and discharges the residual liquid after the disaggregation process. The regenerated pulp manufacturing apparatus according to claim 6, wherein the on-off valve is controlled to be opened when discarded. Provided with a lower limit liquid level detection sensor capable of detecting the lower limit liquid level of the recycled pulp-containing liquid stored in the stirring tank, the control unit, the liquid level of the recycled pulp-containing liquid was less than the installation height of the stirring blade When the said lower limit liquid level detection sensor detects, it controls to discharge | emit and discard a residual liquid from the said residual liquid discharge part, The regenerated pulp manufacturing apparatus of Claim 7 characterized by the above-mentioned.   The regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid take-out part is constituted by a pipe protruding by 10 mm or more from the bottom of the stirring tank. A used paper recycling apparatus comprising the recycled pulp manufacturing apparatus according to claim 1.

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