JP6876210B2 - Recycled pulp manufacturing equipment and recycled paper recycling equipment - Google Patents

Description

The present invention relates to a recycled pulp production apparatus and a recycled paper recycling apparatus.

Conventionally, in Japan, a technology and a social system have been established for collecting used paper once used, for example, used newspaper and used paper generated in offices, and recycling the paper.
However, when recycled paper is made from used paper, the paper consumption areas such as residential areas and offices where used paper is collected as recycled products are separated from the remanufacturing factories that recycle paper from used paper. It takes cost and energy to collect and transport used paper. In addition, in the office, if the used paper is taken out, the confidential information written on the used paper may be leaked to the outside.

Therefore, Patent Document 1 below discloses a technique relating to a recycled paper processing apparatus capable of downsizing the apparatus and processing the used paper at a place where the paper is consumed. The pulper section of the recycled paper processing apparatus includes a stirring tank, a water supply section, a stirring means, a recycled pulp-containing liquid extraction section, and the like. The recycled pulp-containing liquid extraction section is provided at the bottom of the stirring tank, and the recycled pulp-containing liquid containing recycled pulp, water, etc. produced by separating the recycled paper raw material at the pulper section is taken out from the stirring tank. It has become like. The recycled pulp-containing liquid extraction section is connected to a pipe equipped with an on-off valve and a pump outside the stirring tank, and the recycled pulp-containing liquid taken out from the recycled pulp-containing liquid extraction section by a pump is deinked or paper-made. It is supposed to be sent to.

Japanese Unexamined Patent Publication No. 2011-219893

In the recycled pulp production apparatus, the pulper unit has a stirring tank and a stirring device provided in the stirring tank, and disintegrates the used paper to produce a recycled pulp-containing liquid containing recycled pulp. The stirring tank has a recycled pulp-containing liquid take-out portion at the bottom of the tank for discharging the recycled pulp-containing liquid to the outside of the tank, and a transfer portion is connected to the recycled pulp-containing liquid take-out portion. The transfer section transfers the recycled pulp-containing liquid that has been disintegrated in the stirring tank to the deinking section or the papermaking section. In the stirring tank, the recycled pulp-containing liquid is stirred by rotating the stirring blades, and the tube pump of the transfer section is driven to take out the recycled pulp-containing liquid that has been disintegrated in the stirring tank from the recycled pulp-containing liquid extraction section of the stirring tank. , Transfer to the deinking section or papermaking section.

In the pulper portion, the recycled pulp-containing liquid take-out portion provided at the bottom of the stirring tank is provided with an opening in a flat state at the bottom, so that the convection having a low fiber concentration accumulated at the bottom of the stirring tank There is a problem that the recycled pulp-containing liquid is taken out from the non-convection region 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 the recycled pulp-containing liquid disintegrated in the stirring tank is transferred to the deinking section or the papermaking section, the recycled pulp-containing liquid having a desired fiber concentration is taken out from the stirring tank. It is an object of the present invention to provide a recycled pulp production apparatus capable of stabilizing the thickness of recycled paper as a deliverable, and a recycled paper recycling apparatus equipped with the recycled pulp production apparatus.

In order to solve the above problem, the invention according to claim 1 is a pulper section for producing recycled pulp and a pulper section in which the used paper raw material is stirred together with water supplied from the water supply section by a stirring blade in a stirring tank. In a recycled pulp production apparatus provided with a control unit for controlling operation, a recycled pulp-containing liquid extraction unit is provided so as to project from the bottom of the stirring tank and discharge the recycled pulp-containing liquid containing the recycled pulp to the outside of the stirring tank. The regenerated pulp-containing liquid take-out portion is provided at the bottom of the stirring tank, and is installed in a range outside the rotation region of the stirring blade and inside a predetermined amount from the side wall of the stirring tank. To do.

The invention according to claim 2 is characterized in that, in the recycled pulp production apparatus according to claim 1, the recycled pulp-containing liquid extraction portion is composed of a pipe projecting from the bottom of the stirring tank. Is.

The invention according to claim 3 is the regenerated pulp-containing liquid according to claim 1 or 2, wherein the regenerated pulp-containing liquid extraction unit takes in the regenerated pulp-containing liquid at the upper end thereof. It has an intake port, and a predetermined amount is projected from the bottom of the stirring tank so that the recycled pulp-containing liquid intake port reaches the convection region of the vortex generated by the rotation of the stirring blade in the stirring tank. It is characterized by what has been done.

Further, the invention according to claim 4 is connected to the recycled pulp-containing liquid extraction unit in the recycled pulp production apparatus according to any one of claims 1 to 3, and contains recycled pulp in a stirring tank. It is characterized by including a transfer unit for transferring the liquid to the next process.

Further, according to the invention of claim 5 , in the recycled pulp production apparatus according to any one of claims 1 to 4, the residual liquid remaining in the stirring tank is placed in the stirring tank at the bottom of the stirring tank. A residual liquid discharge part is further provided for discharging and discarding the residual liquid to the outside of the tank, and the residual liquid discharge part is a residual liquid intake port for discharging the residual liquid at a position lower than the protruding height of the recycled pulp-containing liquid discharge part. It is characterized by having.

Further, according to the sixth aspect of the present invention, in the recycled pulp production apparatus according to the fifth aspect , the residual liquid discharge unit has an on-off valve capable of arbitrarily opening and closing the drainage path, and the control unit is a stirring tank. It is characterized in that the on-off valve is controlled to be closed during the disintegration process, and the on-off valve is controlled to be opened when the residual liquid is discharged and discarded after the disintegration process.

Furthermore, the invention described in claim 7 is the recycled pulp manufacturing apparatus according to claim 6, comprising a lower liquid level sensor capable of detecting the lower limit liquid level of recycled pulp containing liquid reserved in the stirring tank, control When the lower limit liquid level detection sensor detects that the liquid level of the recycled pulp-containing liquid is equal to or lower than the installation height of the stirring blade, the unit discharges the residual liquid from the residual liquid discharge part and discards it. It is characterized by being controlled to.

Further, the invention according to claim 8 states that in the recycled pulp production apparatus according to claim 1, the recycled pulp-containing liquid extraction portion is composed of a pipe projecting 10 mm or more from the bottom of the stirring tank. It is a feature.

Further, the invention according to claim 9 is characterized in that it is a recycled paper recycling apparatus including the recycled pulp producing apparatus according to any one of claims 1 to 8.

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

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

Block diagram which shows the used paper recycling processing apparatus in embodiment of this invention Sectional drawing which shows the pulper part of the same used paper recycling processing apparatus in 1st Embodiment of this invention. Schematic diagram showing the generation status of "convection region" and "non-convection region" of vortex in the stirring tank Top view of stirring tank 901 Cross-sectional view taken along the line AA 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 waste paper recycling apparatus in the 2nd Embodiment of this invention.

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

The used paper charging section 1 throws recycled paper as a recycled material into the pulper section 9, and throws the used paper into the pulper section 9 in the state of being a sheet of paper or in a cut state. The pulper unit 9 has a stirring tank 901 and a stirring device 92 provided in the stirring tank 901, and dissociates the used paper to produce a recycled pulp-containing liquid containing recycled pulp.

The deinking unit 11 prepares deinked pulp by deinking the regenerated pulp-containing liquid, and includes a deinking tank 501, a bubble releasing device 601 that discharges bubbles from the bottom of the deinking tank 501, and bubble discharging. It has an air supply device (air pump or the like) 602 that supplies air to the device 601. The bubble release device 601 is arranged at the bottom of the deinking tank 501 and is composed of a breathable porous air stone or the like, and the upper surface is formed as a bubble release surface.

The papermaking section 13 is used to dehydrate the pulp mixture deinked in the deinking section 11 to produce wet paper. The drying unit 14 dries the dehydrated wet paper into recycled paper.
The finishing portion 15 performs a finishing step 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 from the papermaking unit 13, and returns the white water to various parts of the recycled paper recycling processing 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 clean water pipe 107, is connected to a white water tank 100, and the water supply pipe 108 is provided with a main valve device 109 for emergency stop including an electromagnetic valve.

(Basic configuration of the pulper part)
As shown in FIG. 2, the used paper charging section 1 is located above the stirring tank 901 of the pulper section 9, and the recycled paper used as a recycled material is directly charged into the pulper section 9 as a sheet of paper. The used paper loading section 1 has a posture holding section 203 for holding the sheet of paper in a standing posture, and the posture holding section 203 is composed of a vertically open quadrangular frame having an upper opening and a lower opening to form a loading section. The lower opening faces the upper opening of the stirring tank 901. The slide bottom plate 206 forming the bottom of the posture holding portion 203 covers the lower opening of the posture holding portion 203, and the slide bottom plate 206 is movable in the slide direction for opening and closing the lower opening.

In order to ensure safety for the user, a cover portion 301 is provided so as to cover the upper opening of the posture holding portion 203, and the cover portion 301 is provided with a transparent door body 302.
In the present embodiment, the stirring tank 901 of the pulper unit 9 will be described as a storage unit, but the present invention can also be applied to a case where a separately provided storage tank or deinking tank is used as the storage unit.
The pulper portion 9 has a stirring blade 902 and a rotating shaft 903 for rotationally driving the stirring blade 902 as a stirring device inside the stirring tank 901 forming the storage portion. The rotary shaft 903 is rotatably supported by two upper and lower bearings 904 and 905 arranged above the stirring tank 901 with its lower end pivotally attached to the bottom of the tank, 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, so that the rotating shaft 903 and the stirring blade 902 rotate.

The stirring 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 has a transfer path for transferring the regenerated pulp-containing liquid dissociated in the stirring tank 901 to the deinking unit 11, and has 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. However, by using the tube pump 910, the transfer amount of the recycled pulp-containing liquid can be accurately grasped. There is no need to install a separate flow meter, which can contribute to cost reduction.

The water supply unit 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 unit 911. Further, a white water return system 105 is connected to the transfer unit 909 as a second water supply unit at a position downstream of the tube pump 910.

Inside the stirring tank 901, as a liquid level sensor for detecting the liquid level of the regenerated 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 a stirring blade 902 in the tank A lower limit liquid level detection sensor 913 corresponding to the position and a specified residual liquid level detection sensor 914 corresponding to the specified residual liquid level when a predetermined amount of the regenerated pulp-containing liquid is stored are provided.

Hereinafter, the operation of the above configuration will be described. The control unit 700 controls the used paper input unit 1, the pulper unit 9, the deinking unit 11, the papermaking unit 13, the drying unit 14, the finishing portion 15, the white water tank unit 100, and the deinking waste liquid treatment device 101, and each processing unit. The used paper recycling processing system is operated in.

The slide bottom plate 206 of the used paper loading unit 1 is arranged at a fully closed position, and in this state, the door body 302 of the cover unit 301 is opened, and a bundle of sheet paper is mounted in the frame of the posture holding unit 203. The slide bottom plate 206 is moved in the opening direction in the slide direction to open the lower opening of the posture holding portion 203. The sheet paper is sequentially dropped from the lower opening into the stirring tank 901 of the pulper portion 9 while maintaining the standing posture as the slide bottom plate 206 opens.

The stirring tank 901 stores a predetermined amount of white water supplied from the water supply unit 911 as dissociation water, and rotates the stirring blade 902 to dissociate the used paper input from the waste paper charging unit 1 in the dissociation water and regenerate it. Produce a pulp-containing liquid. Then, the diluted water that is insufficient for the amount of used paper put in is supplied from the water supply unit 911, and the recycled pulp-containing liquid is adjusted to a predetermined concentration.

Next, while rotating the stirring blade 902 to stir the recycled pulp-containing liquid, the tube pump 910 of the transfer unit 909 is driven to take out the recycled pulp-containing liquid from the recycled pulp-containing liquid extraction unit 908 of the stirring tank 901, and remove the recycled pulp-containing liquid. Transfer to the sumi part 11. The control unit 700 detects that the liquid level in the tank has reached the specified remaining amount liquid level by the specified remaining amount liquid level detection sensor 914, so that the recycled pulp-containing liquid in the tank is reduced to the specified remaining amount. Is recognized, and water for dilution is supplied from the water supply unit 911 to the stirring tank 901. For example, the specified residual liquid level is set to the liquid level at which 50 L of the recycled pulp-containing liquid remains in the tank, and when the specified residual liquid level detection sensor 914 detects the specified residual liquid level, the water supply unit 911 to 5 L is diluted. Supply water. During this period, the transfer of the recycled pulp-containing liquid by the tube pump 910 is continued, and when the liquid level of the stirring tank 901 reaches the specified residual liquid level, 5 L of water for dilution is supplied again, and this operation is repeated.

After that, the liquid level in the stirring tank 901 drops, 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 recycled pulp-containing liquid cannot be sufficiently stirred and the concentration of the recycled pulp-containing liquid becomes unstable (a state in which the solid waste paper pulp and the liquid phase are not sufficiently mixed), the stirring blade 902 The rotation is stopped, the disintegration process is completed, the papermaking operation of the papermaking unit 13 is stopped, and the supply of white water from the white water return system 105 to the transfer unit 909 by the self-priming supply pump (not shown) is also stopped. (Mixing in the transfer unit 909 is also stopped). In that state, the transfer of the regenerated pulp-containing liquid by the tube pump 910 is continued, and the pulp-containing liquid corresponding to the lower limit liquid level is discarded to the outside of the apparatus through a drainage path (not shown) from the deinking portion 11.

(First Embodiment)
Hereinafter, the first embodiment of the present invention will be described with reference to FIGS. 3 to 5. In the basic configuration of the pulper section described above, the bottom of the stirring tank 901 is provided with a recycled pulp-containing liquid taking-out section 908 that protrudes from the bottom and discharges the recycled pulp-containing liquid containing recycled pulp to the outside of the stirring tank 901. Provided. The recycled pulp-containing liquid extraction section 908 is composed of, 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 portion of the side surface of the stirring tank 901.

FIG. 3 is a cross-sectional view showing a pulper portion of a recycled paper recycling apparatus. When the recycled paper raw material is stirred by the stirring blade 902 in the stirring tank 901 together with the water supplied from the water supply unit 911 in the stirring tank 901 during the production of recycled pulp, as shown in FIG. Due to the rotation, a "convection region" 81 of the vortex flow 80 is generated in the central portion of the stirring tank 901. Further, a "non-convection region" 82 is generated outside the convection region.

FIG. 4 is a plan view of the stirring tank 901. The stirring blade 902 includes a protruding portion 915 composed of a separate member, and the upper surface and the lower surface are formed in parallel with the horizontal plane. FIG. 5 is a cross-sectional view taken along the line AA of FIG. As shown in FIG. 5, the cross-sectional shape of the protruding portion 915 is formed in a trapezoidal shape in which the upper portion protrudes in the direction opposite to the rotation direction R during the disassembly process. The protrusion 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 rotation of the stirring blade 902 generates a "convection region" 81 of the vortex in the central portion of the stirring tank 901. Further, a "non-convection region" 82 is generated outside the convection region.

Specifically, the bottom of the stirring tank 901 and the vicinity of the side wall of the stirring tank 901 have a "non-convection region" 82 of the vortex flow 80 of about 10 mm, and inside the "non-convection region" 82 of the vortex flow generated by the rotation of the stirring blade 902. There is a "convection region" 81. In the "non-convection region" 82, the concentration of the recycled paper pulp liquid is low, and a region having a color close to transparent can be visually confirmed. Further, in the "convection region" 81, the concentration of the recycled paper pulp liquid is higher than that of the "non-convection region" 82, and a region having a darker color than the "non-convection region" 82 can be visually confirmed. In the actual measurement, it was confirmed that 81 was close to the ideal calculated concentration (4%).

In the stirring tank 901 in which the "convection region" 81 and the "non-convection region" 82 were generated by the rotation of the stirring blade 902, the tube pump 910 of the transfer unit 909 was driven while stirring the recycled pulp-containing liquid by the stirring blade 902. When the recycled pulp-containing liquid is taken out from the recycled pulp-containing liquid taking-out part 908 of the stirring tank 901 and transferred to the deinking part 11, the recycled pulp-containing liquid taking-out part 908 is flat on the bottom of the stirring tank 901 as in the conventional case. If an opening is provided in this state, the used paper pulp liquid is taken out from the "non-convection region" 82 of the vortex 80 having a low fiber concentration accumulated at the bottom of the stirring tank 901, and depending on the situation, the fiber concentration may be calculated. As a result, there is a problem that the thickness of recycled paper as a product is thinner than expected.

In the present invention, the regenerated pulp-containing liquid take-out unit 908 is composed of, for example, a pipe having a regenerated pulp-containing liquid intake port 905 projecting from the bottom of the stirring tank 901, and the regenerated pulp-containing liquid intake port 905. Is configured to project a predetermined amount from the bottom of the stirring tank 901 so that the pulp reaches the "convection region" 81 of the vortex flow 80 generated by the rotation of the stirring blade 902 in the stirring tank. In the plan view of the stirring tank of FIG. 4, the recycled pulp-containing liquid extraction section 908 is the bottom portion of the stirring tank 901, which is outside the rotation region of the stirring blade and inside the side wall of the stirring tank by a predetermined amount. It is installed in the range of.

The inside (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 vicinity of the side wall of the stirring tank 902 has a vortex "non-convection region" 82, so that the recycled pulp There is a problem that the fiber concentration of the contained liquid is low. By avoiding both of the problem areas, the maintainability and the acquired concentration of the recycled pulp-containing liquid are in a good state. Therefore, in the stirring tank 901, the recycled pulp-containing liquid take-out unit 908 can take out the recycled pulp liquid from the "convection region" 81 close to the ideal calculated concentration (4%), and the recycled paper as a product can be taken out. The thickness can be stabilized.

Next, regarding the regenerated pulp-containing liquid extraction unit 908, how much the regenerated pulp-containing liquid intake port 905 should protrude from the bottom of the stirring tank 901 to reach the "convection region" 81 of the vortex flow 80. I did a test. In the test method, the concentration of the recycled pulp-containing liquid obtained from the recycled pulp-containing liquid extraction unit 908 was measured while changing the protruding height of the discharge pipe from the bottom of the stirring tank 901 to 0, 10, and 20 mm, respectively. .. The concentration is measured by the weight ratio (% by weight) of the used paper pulp (dried used paper pulp in the used paper pulp liquid) to the total weight of the obtained used paper pulp liquid.

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

From the above test results, the height of the pipe (recycled pulp-containing liquid extraction section 908) from the bottom of the stirring tank 901 was set to 10 mm by design. In terms of performance, the protrusion height may be set to 20 mm, but there is a problem that the recycled pulp-containing liquid cannot be completely drained from the stirring tank 901 after the pulp production work (after the disintegration treatment), so as much as possible. It is better to set it short. The height of the stirring blade 902 is set at a height of 30 mm from the bottom of the stirring tank 901, and when the liquid level becomes lower than that, the liquid cannot be sufficiently dissociated. Drain outside the device and dispose of it. The wastewater (disposal) treatment of the recycled pulp-containing liquid after the pulp production 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, a residual liquid is discharged from the bottom of the stirring tank 901 according to the first embodiment described above for draining (discarding) the recycled pulp-containing liquid after the pulp manufacturing operation (after the disintegration treatment). 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 protrusion height of the recycled pulp-containing liquid discharge portion 908. Therefore, in the stirring tank 901, the residual water remaining at a position lower than the protrusion height of the recycled pulp-containing liquid extraction section 908 can be discharged (discarded) to the outside of the stirring tank by the residual liquid discharging section 918 separately installed. It can be made and will not be affected by residual pulp or dust during the next disintegration 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 disintegration process in the stirring tank. The on-off valve 917 is controlled to be opened when the water is drained and disposed of. Therefore, the residual water can be discharged (discarded) to the outside of the stirring tank at a predetermined timing.

Further, 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 sets the liquid level of the recycled pulp-containing liquid to be equal to or lower than the installation height of the stirring blade 902. When the lower limit liquid level detection sensor 913 detects that the result has occurred, the on-off valve 917 is opened to control the residual liquid to be discharged from the residual liquid discharge unit 918 and discarded. Therefore, the residual water that is below the installation height of the stirring blade 902 can be automatically discharged (discarded) to the outside of the stirring tank 901 by the separately installed residual liquid discharge unit 918, and at the time of the next disassembly process. It can be prevented from being affected by residual pulp or dust that is insufficiently dissociated.

When the water level of the pulp-containing liquid stored in the stirring tank 901 is equal to or lower than the installation height of the stirring blade 902, the water supply unit 911 supplies a predetermined amount of white water to the stirring tank and the residual liquid. The residual water may be discharged (discarded) from the discharge unit 918. By doing so, white water can be supplied to the residual water from the water supply unit 911 and discharged (discarded) to the outside of the stirring tank, and residual pulp, dust, and the like can be washed away together. Further, the residual liquid discharge unit 918 may be configured to include a filtration unit as a foreign matter collecting unit.

Although the embodiments of the present invention have been described above, the specific configuration is not limited to the embodiments of the present invention, and the present invention includes design changes within a range that does not deviate from the gist of the present invention. included. The shape of the tank body of the deinking portion 11 is not limited to a hexagon, but can be formed into a cylindrical body having a cylindrical shape or a polygonal shape in a plan view.

9 Pulper part 11 Deinking part 13 Paper making part 80 Vortex 81 Convection area 82 Non-convection area 700 Control part 901 Stirring tank 902 Stirring blade 903 Rotating shaft 904 Bearing 905 Recycled pulp-containing liquid intake port 908 Recycled pulp-containing liquid take-out part 909 Transfer Part 910 Tube pump 911 Water supply part 912 Upper limit liquid level detection sensor 913 Lower limit liquid level detection sensor 914 Specified residual liquid level detection sensor 915 Protruding part 916 Screw 917 On-off valve 918 Remaining liquid discharge part 919 Remaining liquid intake port R Stirring Direction of rotation of the blade

Claims (9)

In the recycled pulp production apparatus provided with a pulper unit for producing recycled pulp by stirring the used paper raw material together with water supplied from the water supply unit by a stirring blade in a stirring tank, and a control unit for controlling the operation of the pulper unit. A recycled pulp-containing liquid take-out portion is provided so as to project from the bottom of the stirring tank and discharge the recycled pulp-containing liquid containing the recycled pulp to the outside of the stirring tank. A regenerated pulp manufacturing apparatus, which is installed in a range outside the rotation region of the stirring blade and inside a predetermined amount from the side wall of the stirring tank. The regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid extraction unit is composed of a pipe projecting from the bottom of the stirring tank. The regenerated pulp-containing liquid take-out portion has a regenerated pulp-containing liquid intake port at the upper end for taking in the regenerated pulp-containing liquid, and the regenerated pulp-containing liquid intake port is generated by rotation of a stirring blade in the stirring tank. The regenerated pulp production apparatus according to claim 1 or 2, wherein a predetermined amount is projected from the bottom of the stirring tank so as to reach the convection region of the vortex. The regeneration according to any one of claims 1 to 3, 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. Pulp production equipment. At the bottom of the stirring tank, a residual liquid discharging section for discharging the residual liquid remaining in the stirring tank to the outside of the stirring tank and discarding the residual liquid is further provided, and the residual liquid discharging section is the recycled pulp-containing liquid discharging section. The regenerated pulp manufacturing apparatus according to any one of claims 1 to 4, wherein the remanufactured pulp manufacturing apparatus has a residual liquid intake port for discharging the residual liquid at a position lower than the height of the protrusion. The residual liquid discharge unit has an on-off valve capable of opening and closing the drainage path arbitrarily, and the control unit controls to close the on-off valve during the disintegration process in the stirring tank, and discharges the residual liquid after the disintegration process. The recycled pulp production apparatus according to claim 5 , wherein the on-off valve is controlled to be opened at the time of disposal. 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 is provided, and the control unit has the liquid level of the recycled pulp-containing liquid equal to or lower than the installation height of the stirring blade. The regenerated pulp production apparatus according to claim 6 , wherein when the lower limit liquid level detection sensor detects the above, the residual liquid is discharged from the residual liquid discharge unit and controlled to be discarded. The regenerated pulp production apparatus according to claim 1, wherein the regenerated pulp-containing liquid extraction unit is composed of a pipe projecting 10 mm or more from the bottom of the stirring tank. A recycled paper recycling apparatus comprising the recycled pulp production apparatus according to any one of claims 1 to 8.

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