JP5499263B2 - Recycled pulp manufacturing method, recycled pulp manufacturing apparatus, and used paper recycling processing apparatus - Google Patents

Description

  The present invention relates to a recycled pulp manufacturing method, a recycled pulp manufacturing apparatus, and a used paper recycling processor.

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 Documents 1 and 2 below disclose a waste paper processing apparatus that can reduce the size of the apparatus and process waste paper at a paper consumption place. Patent Document 1 discloses a waste paper recycling method and apparatus as follows: A step of separating recycled paper cut by a document cutting machine into a recycled pulp, a step of storing the recycled pulp, a step of filling the recycled pulp into an injection device and spraying the fiber sheet, and a recycled pulp sprayed on the fiber sheet A configuration including a paper making process is described.

 Patent Document 2 discloses that a recycled pulp section for separating recycled paper to prepare recycled pulp, a deinked pulp section for bleaching recycled pulp to prepare deinked pulp, and paper for deinked pulp. A used paper processing apparatus that integrally includes a papermaking section for preparing recycled paper is described.

JP-A-10-317290 JP 2009-299228 A

In the above Patent Documents 1 and 2, when producing recycled pulp, problems such as noise caused by rotation while the air of the stirring blade is entrained and a reduction in stirring efficiency are caused, and the pulp is efficiently and reliably disaggregated in a short time. There is a need for a method of producing

The present invention solves the above-mentioned problems, can avoid noise and reduction in stirring efficiency due to rotation while entraining the air of the stirring blades, and produces regenerated pulp by efficiently and reliably disaggregating in a short time An object of the present invention is to provide a recycled pulp manufacturing method, a recycled pulp manufacturing apparatus, and a used paper recycling processing apparatus equipped with the recycled pulp manufacturing apparatus.

In order to achieve the above object, the recycled pulp manufacturing method according to claim 1 is a recycled pulp manufacturing method in which recycled paper raw materials are stirred with stirring blades in a stirring tank together with water supplied from a water supply unit to manufacture recycled pulp. in the level of the liquid containing water from waste paper material and the water supply unit in the stirring tank, with the stirring by the stirring blades have been made, have rows stirring the stirring blade as immersible height, stirring When the rotational speed of the stirring blade is increased during the treatment, water is supplied from the water supply unit so that the stirring blade is immersed in the liquid in the stirring tank .

The invention described in claim 2 is the method for producing recycled pulp according to claim 1, wherein the stirring tank has an inner diameter of 75 mm to 500 mm.

The invention according to claim 3 is the method for producing recycled pulp according to claim 1 or claim 2, wherein the concentration of the used paper raw material in the liquid containing water from the used paper raw material and the water supply unit in the stirring tank is 4 Recycled pulp is produced as 0.5 wt% to 8.0 wt%.

  Furthermore, the invention according to claim 4 is the recycled pulp manufacturing method according to claim 1 or claim 3, wherein the stirring time by the stirring blades of the liquid containing water from the waste paper raw material and the water supply section is 30 minutes or more. It is a thing.

Further, the invention according to claim 5 controls the operation of the recycled pulp section, and the recycled pulp section that stirs the used paper raw material together with the water supplied from the water supply section with the stirring blade in the stirring tank to produce the recycled pulp. In the regenerated pulp manufacturing apparatus comprising the control unit, the control unit is configured to remove the water level of the liquid containing water from the waste paper raw material and the water supply unit in the stirring tank while the stirring blade is being stirred by the stirring blade. The amount of water supplied from the water supply unit is controlled so that it can be immersed, and when the rotation speed of the stirring blade is increased during the stirring process, water is supplied from the water supply unit and the stirring blade is immersed in the liquid in the stirring tank. The present invention relates to a regenerated pulp manufacturing apparatus that is controlled so as to be controlled .

Furthermore, the invention according to claim 6 relates to a used paper recycling apparatus comprising the recycled pulp manufacturing apparatus according to claim 5 and a paper making apparatus for papermaking the recycled pulp-containing liquid produced by the recycled pulp manufacturing apparatus. belongs to.

According to the method for producing recycled pulp according to claim 1, the stirring blade can be immersed in a state where the water level of the liquid containing water from the waste paper raw material and the water supply unit in the stirring tank is being stirred by the stirring blade. There rows stirred as such height, when increasing the speed of the stirring blade in the stirring process, by performing the water supply from the water supply unit, since dipping the stirring blade in the liquid inside the stirring tank, a stirring blade of air It is possible to avoid noise and a decrease in stirring efficiency due to rotation while being caught.

Moreover, according to the regenerated pulp manufacturing method of Claim 2, since it stirs in the stirring tank whose internal diameter of a stirring tank is 75 mm-500 mm, an occupation area is small, making disaggregation processing efficiency sufficient. Therefore, it is possible to reduce the size of the recycled pulp apparatus.

And according to the recycled pulp manufacturing method of Claim 3, the density | concentration of the used paper raw material in the liquid containing the used paper raw material and the water from a water supply part in a stirring tank shall be 4.5 weight%-8.0 weight%. Since recycled pulp is produced, the ratio of waste paper materials dispersed in water in the agitation tank to each other and the ratio of waste paper materials and agitation blades to contact each other can be increased. In addition to being able to proceed well, the disaggregation process proceeds and the liquid can be sufficiently stirred while suppressing the power consumption of the driving means even in a state where the viscosity has increased.

  Furthermore, according to the method for producing recycled pulp according to claim 4, since the stirring time by the stirring blade of the liquid containing the waste paper raw material and water from the water supply unit is set to 30 minutes or more, the waste paper raw material is sufficiently disaggregated. Can do.

According to the recycled pulp manufacturing apparatus according to the present invention, the recycled paper raw material is stirred together with the water supplied from the water supply unit by the stirring blade in the stirring tank, and the recycled pulp unit for manufacturing the recycled pulp and the operation of the recycled pulp unit are controlled. In the recycled pulp manufacturing apparatus comprising the control unit, the control unit is configured to agitate the water level of the liquid containing water from the waste paper raw material and the water supply unit in the agitation tank while the agitation blade is agitating. The amount of water supplied from the water supply unit is controlled so that the height can be immersed, and when the rotation speed of the stirring blade is increased during the stirring process, water is supplied from the water supply unit , and the stirring blade is turned into the liquid in the stirring tank. Since it is controlled to be immersed, it is possible to avoid noise and a decrease in stirring efficiency due to rotation while entraining the air of the stirring blade in the stirring tank.

According to the used paper recycling apparatus according to the present invention, the recycled pulp manufacturing apparatus according to claim 5 and the papermaking apparatus for papermaking the recycled pulp-containing liquid manufactured by the recycled pulp manufacturing apparatus are provided. Recycled pulp can be efficiently produced in the production apparatus, and recycled paper containing the obtained regenerated pulp can be produced with a papermaking apparatus to produce regenerated paper with good quality.

1 is a schematic configuration diagram of a used paper recycling processing apparatus according to an embodiment of the present invention. It is the structure schematic of the recycled pulp part of the said used paper reproduction | regeneration processing apparatus. It is a perspective view of the stirring blade of the pulper of the regenerated pulp part. It is a perspective view which shows the other example of the stirring blade of the said pulper. It is the top view and sectional drawing of the deinking process part of the said used paper reproduction | regeneration processing apparatus. It is a schematic perspective view of the papermaking part and the finishing calendar part of the used paper recycling apparatus.

(Outline of used paper recycling equipment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a used paper processing apparatus according to the present invention. In FIG. 1, a used paper recycling processor 100 integrally includes a recycled pulp unit 1, a deinking pulp unit 2, a paper making unit 3, a finishing unit 4, a drainage processing unit 5, and a control unit (not shown). . The recycled pulp section 1 is for producing recycled pulp by disaggregating the waste paper raw material 6, and the deinking pulp section 2 is for deinking the recycled pulp produced in the recycled pulp section 1, and the paper making section 3 Is a paper made from the deinked pulp obtained in the deinked pulp section 2 and the wet paper obtained by the paper making is dried. The finishing section 4 is obtained by drying the wet paper in the paper making section 3 Is processed by calendaring and cutting to obtain recycled paper 7, and the control unit controls the operation of each unit.

(Recycled pulp section)
FIG. 2 is a schematic configuration diagram of the recycled pulp unit 1. The recycled pulp unit 1 is configured by a recycled pulp manufacturing apparatus K. As shown in FIG. 2, the recycled pulp manufacturing apparatus K includes a used paper raw material supply unit 9, a measurement unit 17, and a pulper 18.

As the used paper raw material 6, it is possible to process both a rough paper 66 which is a used paper raw material 6 having a size equal to or larger than a predetermined size and a shredded paper 67 which is a used paper raw material 6 having a size smaller than a predetermined size. The rough paper 66 includes regular paper such as A4 and B5, and further includes waste paper raw material 6 other than regular paper such as square. The shredded paper 67 includes waste paper raw material 6 that has been cut to a size smaller than a predetermined size by a cutting device such as a shredder, and further includes waste paper raw material 6 that has not been cut by the cutting device.

The used paper raw material supply unit 9 includes a rough paper supply unit 11 that supplies the rough paper 66 and a shredded paper supply unit 12 that supplies the shredded paper 67. The rough paper supply unit 11 includes a rough paper placing table 111 on which the rough paper 66 is placed, a lifting / lowering unit (not shown) for raising and lowering the rough paper placing table 111, and a plurality of pieces placed on the rough paper placing table 111. A paper feed roller 112 that conveys the uppermost coarse paper 66 to the measurement unit 17 is provided.

The shredded paper supply unit 12 is provided with a shredder tank 121 for storing the shredded paper 67, and a discharge port 122 for the shredded paper 67 is formed at the bottom of the shredder tank 121. The discharge port 122 is provided with an opening / closing member 124 that can be opened and closed by swinging as shown by a two-dot chain line in FIG. 2. A shredder is provided above the opening / closing member 124 when the opening / closing member 124 is opened. A discharge device 125 for discharging the shredded paper 67 in the tank 121 downward is provided. The configuration of the discharge device 125 is not particularly limited as long as the shredded paper 67 can be discharged downward. FIG. 2 shows a pair of rotating bodies 127, and the rotating bodies 127 are both rotating bodies 127. The shredded paper 67 is sandwiched between them and rotated to discharge the shredded paper 67 downward.

The measurement unit 17 measures the weight of the used paper raw material 6 supplied from the rough paper supply unit 11 and the shredded paper supply unit 12. The measurement unit 17 is disposed at a slightly lower position below the discharge port 122 and downstream in the conveyance direction of the rough paper 66 by the paper feed roller 112. The measuring unit 17 includes a tray 171 that receives the rough paper 66 and the shredded paper 67.

As shown by a two-dot chain line in FIG. 2, the tray 171 is configured to be tiltable from a horizontal posture to a tilted posture tilting toward the pulper 18, and driving means (not shown) such as a motor that tilts the tray 171. Have. Further, in the tilting posture, the tray 171 is not provided with a side wall on the low position side, and the used paper raw material 6 can be dropped onto the pulper 18 only by tilting the tray 171.

The pulper 18 disaggregates the waste paper raw material 6 input from the measuring unit 17 into fibers, that is, recycled pulp, in the liquid of water and a disaggregation accelerator. The stirrer 181, the water supply unit 182, and the disaggregation accelerator supply Unit 183, deinking agent supply unit 184, stirring means 189, and recycled pulp-containing liquid extraction unit 186.

The shape and size of the agitation tank 181 are not particularly limited, but it is preferable to use one formed in a substantially cylindrical shape with a bottom from the viewpoint of good agitation efficiency. Also, from the viewpoint of disaggregation efficiency and downsizing of the apparatus, the inner diameter is 75 mm to 500 mm, more preferably about 300 mm to 400 mm, and the capacity is about 0.4 L to 30 L, more preferably about 7 L to 25 L. It is preferable to use it.

A plurality of baffle plates 50 are provided on the inner wall surface of the stirring tank 181. The baffle plate 50 is not particularly limited in shape, installation location, and number as long as the liquid stored in the agitation tank 181 is appropriately agitated and the rotation of the agitation blade is suppressed while entraining the air. In FIG. 2, as an example, a baffle plate formed in a triangular prism shape is projected at a plurality of locations on the inner wall surface in the substantially central portion of the stirring tank 181 in the height direction.

The water supply unit 182 is provided above the agitation tank 181, and the water supply unit 182 includes a supply unit (not shown) of tap water such as tap water and a drainage treatment unit described later by piping (not shown). The white water tank 54 is connected to both of the water and the white water in the white water tank 54 to supply either water to the agitation tank 181.

The disaggregation accelerator supply unit 183 is provided above the stirring tank 181. As the disaggregation accelerator supplied from the disaggregation accelerator supply unit 183, one or more selected from alkalis such as sodium hydroxide, sodium carbonate, sodium silicate, potassium hydroxide, sodium sulfite, or an aqueous solution thereof is used. In addition, acids such as sulfamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, and aluminum sulfate, oxidizing agents such as sodium hypochlorite, sodium chlorite, and hydrogen peroxide, surfactants, bleaching agents, and PH stabilizers Further, chelating agents, dispersing agents and the like can be used supplementarily.

The deinking agent supply unit 184 is provided to preliminarily add a deinking agent necessary for the deinking process performed in the subsequent deinking pulp unit 2 to the pulper 18. The deinking agent supply unit 184 is provided above the stirring tank 181. Examples of the deinking agent supplied from the deinking agent supply unit 184 include fatty acid salts, higher alkyl sulfates, alkylbenzene sulfonates, and higher alcohols. In addition, known substances such as anionic surfactants, nonionic surfactants, cationic surfactants, and the like, such as alkylene oxide adducts such as alkylphenols and fatty acids, can be used.

The stirring means 189 is provided at the bottom of the stirring tank 181 and is driven by a stirring blade 187 for stirring and separating the waste paper raw material 6 together with the water supplied from the water supply unit 182 and a motor for driving the stirring blade 187 to rotate. Means 188. FIG. 3 is a perspective view of a thin flat plate-like stirring blade 187 as an example of the stirring blade 187. The stirring blade 187 is formed by fixing a thin flat plate 36 formed in a cross shape in plan view on a rotary shaft 38 in two upper and lower stages, and a taper portion 39 formed in a tapered shape on the top of the rotary shaft 38. Provided. The rotating shaft 38 of the stirring blade 184 is provided at a position slightly decentered from the center of the stirring tank 181, whereby the liquid stored in the stirring tank 181 can be efficiently stirred.

The thickness of the stirring blade 187 is preferably about 2 mm to 5 mm. By being 2 mm or more, the waste paper raw material 6 stored in the stirring tank 181 can sufficiently stir the liquid such as water, and since it is 5 mm or less, the waste paper raw material 6 is efficiently cut by the stirring blade 187. Recycled pulp can be manufactured.

The stirring blade 187 is preferably provided at a height position of about 20 mm to 100 mm from the bottom surface of the stirring tank 181. By making the height position of the stirring blade 187 higher than 20 mm, the shredded paper 67 and the rough paper 66 can be easily embedded under the stirring blade 187 during the disaggregation process. The recycled paper can be produced by cutting the coarse paper with the stirring blade 187. In addition, by lowering the height position of the stirring blade 187 below 100 mm, when the small amount of used paper raw material 6 is disaggregated, the stirring blade 187 can be immersed in a liquid containing water from the used paper raw material 6 and the water supply unit 182. In addition, it is possible to prevent rotation of the stirring blade 187 while entraining the air.

The thin plate 36 of the stirring blade 187 is not limited to the one shown in FIG. 3, and may have another shape. For example, a thin plate 37 shown in FIG. 4 may include a flat portion 37a and a bent portion 37b bent at a predetermined angle from the flat portion 37a. Among these, the stirring blade comprising the flat thin plate 36 shown in FIG. 3 is capable of easily cutting the waste paper raw material 6 immersed in water during the disaggregation process and finishing the disaggregation process in a short time. 187 is preferred. FIG. 3 shows a stirring blade 187 provided with a four-blade thin plate 36 having a cross shape in plan view. However, the stirring blade 187 is formed into another shape such as a star shape by three blades or five or more blades. It doesn't matter.

Although not shown, the agitation tank 181 is provided with a heater and a temperature sensor for heating the liquid stored in the agitation tank 181 to a predetermined temperature.

The recycled pulp-containing liquid take-out section 186 is provided at the bottom of the stirring tank 181 and takes out a recycled pulp-containing liquid containing recycled pulp, water, and the like produced by disaggregating the waste paper raw material 6 with the pulper 18. ing. The recycled pulp-containing liquid extraction unit 186 is connected to a pipe 207 provided with an on-off valve 208 and a pump 209, and the recycled pulp-containing liquid taken out by the pump 209 from the recycled pulp-containing liquid extraction unit 186 is removed from the deinked pulp unit 2 or The paper is sent to the papermaking section 3.

(Deinking pulp section)
As shown in FIG. 1, the deinking pulp unit 2 includes a pre-deinking dilution unit 21 and a deinking processing unit 22, and a transfer unit (not shown) including a pipe, a pump, and the like is provided between the units. .

  The pre-deinking diluting unit 21 dilutes the regenerated pulp-containing liquid sent from the regenerated pulp production apparatus K to a fiber concentration suitable for deinking, and inputs dilution water, a surfactant as a deinking agent, and the like. A diluent supply unit (not shown) is provided.

In addition, the deinking process by the deinking processing unit 22 can be omitted. When the deinking process is omitted, the regenerated pulp-containing liquid sent from the regenerated pulp manufacturing apparatus K is used as a pre-deinking dilution unit. 21. Dilute to fiber concentration suitable for papermaking.

 FIG. 5A shows a plan view of the deinking processing unit 22, and FIG. 5B shows a cross-sectional view taken along line AA in FIG. 5A. The deinking processing unit 22 is called a flowtater, and separates printing components such as ink components and toner components from the recycled pulp-containing liquid to produce deinked pulp. The recycled pulp-containing liquid circulation tank 221 , A blade 222 and a bubble discharge tank 223 are provided.

The recycled pulp-containing liquid distribution tank 221 distributes the recycled pulp-containing liquid adjusted to a predetermined concentration by supplying the diluted liquid in the pre-deinking dilution section 21. The recycled pulp-containing liquid circulation tank 221 is partitioned into a plurality of deinking chambers 225 by a plurality of partition walls 224, and the left or right side of the partition walls 224 are alternately arranged as shown in FIG. All the deinking chambers 225 communicate with each other by opening.

At the bottom of each deinking chamber 225, a bubble supply unit 226 for supplying fine bubbles to the recycled pulp-containing liquid flowing in the recycled pulp-containing liquid circulation tank 221 is provided, and both of the partition walls 224 are provided. A temperature sensor 227 and a heater 228 are respectively arranged at substantially the center in the height direction of the surface. Also, an inflow portion 229a for allowing the recycled pulp-containing liquid to flow into the recycled pulp-containing liquid circulation tank 221 and a deinked pulp-containing liquid containing deinked pulp generated after the deinking treatment are placed outside the recycled pulp-containing liquid circulation tank 221. An outflow portion 229b is provided.

The blade 222 is for sweeping bubbles floating above the regenerated pulp-containing liquid circulation tank 221 over the peripheral wall of the regenerated pulp-containing liquid circulation tank 221, and sweeping out the bubbles to the bubble discharge tank 223 side. It is provided above the tank 221 and is configured to reciprocate while being guided by the guide rail 222b by driving the motor 222a.

As shown in FIG. 5 (a), the bubble discharge tank 223 is provided in a square shape in plan view so as to surround the outer periphery of the recycled pulp-containing liquid circulation tank 221, and in the recycled pulp-containing liquid circulation tank 221 during deinking, The bubbles generated and swept out by the blade 222 are temporarily stored. The bubble discharge tank 223 is provided with a cleaning liquid ejecting section 223a that ejects a cleaning liquid such as water for washing away bubbles attached to the bubble discharge tank 223 and the blade 222 and the like. A plurality of cleaning liquid ejection portions 223a are provided over the entire circumference of the upper and middle steps of the wall surface in the bubble discharge tank.

Further, the bubble discharge tank 223 preferably includes a defoaming part (not shown) for eliminating the generated bubbles. The structure of the defoaming part is not limited as long as bubbles can be eliminated. For example, a wind supply part (not shown) that supplies hot air or hot air can be used, and hot air or hot air is supplied from the wind supply part to the bubbles. Air bubbles are extinguished by blowing away the moisture of the air bubbles. In the case where such a wind supply unit is provided, it is more preferable that the warm air or hot air from the wind supply unit is dry hot air or hot air having a low moisture content. Thereby, the water | moisture content of a bubble can be blown away more easily.

At the bottom of the bubble discharge tank 223, there is provided a deinking drainage extraction section 75 for taking out deinking drainage containing cleaning liquid from the cleaning liquid ejection section 223a stored in the bubble discharge tank 223, liquid generated by disappearance of bubbles, and the like. The deinking drainage taken out from the deinking drainage extraction unit 75 is sent to the deinking drainage tank 53.

(Paper making)
FIG. 6 is a schematic perspective view of the papermaking section 3 and the calendar section 41 of the finishing section 4. The paper making unit 3 is a deinked pulp-containing liquid that has been deinked by the deinking process unit 22 or, if the deinking process is omitted, a regenerated pulp-containing liquid diluted to a predetermined concentration by the pre-deinking diluting unit 21. Is made by the paper making apparatus S. As shown in FIG. 6, the paper making unit 3 includes a head box 31, a wire unit 32, a dehydrating unit 33, and a dryer unit 34.

The head box 31 is for uniformly supplying the deinked pulp-containing liquid or the regenerated pulp-containing liquid to the wire part 32. The upper part of the head box 31 is open and the deinked pulp-containing liquid is supplied to the lower part. A mouth 31a is formed. Guide members 31b having a predetermined length are cantilevered along both side edges of the mesh belt 323 of the wire portion 32 at both longitudinal ends of the supply port 31a for the deinked pulp-containing liquid. The guide member 31 b is configured to prevent the deinked pulp-containing liquid supplied from the head box 31 onto the mesh belt 323 of the wire portion 32 from flowing down from the side edge of the mesh belt 323.

The wire portion 32 has a mesh belt 323 stretched over a plurality of rotating rollers 321, and the mesh belt 323 forms an endless track including an outward track 323a and a return track 323b. In addition, a water receiving portion 325 that receives water flowing down from the mesh of the forward path 323a is provided below the forward path 323a. The water receiving unit 325 is connected to a white water tank 54 (see FIG. 1) of the drainage processing unit 5 described later.

As shown in FIG. 6, the dewatering unit 33 has a pair of upper and lower endless water absorbing belts 332 a and 332 b made of felt that are respectively stretched between a plurality of rotating rollers 331, and includes an upper water absorbing belt 332 a and a lower water absorbing belt 332 a. A part of the water absorbing belt 332b is in contact with the water absorbing belt 332b. In a portion where the upper water-absorbing belt 332a and the lower water-absorbing belt 332b are partially in contact with each other, a plurality of a pair of squeezing rollers 334 are provided to squeeze the water-absorbing belts 332a and 332b.

The upper water-absorbing belt 332a and the lower water-absorbing belt 332b are shifted in position by a predetermined length, and the upper water-absorbing belt 332a is more upstream in the running direction of the wet paper 64 than the lower water-absorbing belt 332b. Has been placed. As a result, the wet paper 64 conveyed on the mesh belt 323 is first transferred to the upper water absorbing belt 332a, and then the wet paper 64 is not brought into contact with the lower water absorbing belt 332b until immediately before pressing by the pressing roller 334. I have to.

The dryer section 34 includes a plurality of rotating rollers 351 and a drying roller 343 disposed in a hood (not shown), and includes a pair of upper and lower conveying belts 342 spanned between the plurality of rotating rollers 351 and the drying roller 343. . The material of the conveyor belt 342 is not particularly limited. For example, cloth, heat-resistant resin, metal, or the like is used, and the upper and lower conveyor belts 342 run in a state where a part of the conveyor belts 342 is in contact. The drying roller 343 is arranged. The drying roller 343 includes a heater 345 inside, a winding belt 342 is wound around the outer peripheral surface, and a temperature sensor (not shown) that measures the temperature of the surface of the drying roller 343.

(Finishing part)
As shown in FIG. 1, the finishing unit 4 has a calendar unit 41 and a cut unit 42. As shown in FIG. 6, the calendar unit 41 includes a plurality of press rollers 411 for increasing the flatness of the paper. The cutting unit 42 includes a cutting blade (not shown) for cutting paper into a predetermined sheet size.

(Drainage processing part)
As shown in FIG. 1, the drainage treatment unit 5 includes tank bodies of a deinking drainage tank 53 and a white water tank 54, and the drainage in the deinking drainage tank 53 that is highly contaminated and difficult to reuse is If necessary, the waste paper is detoxified by performing a predetermined waste liquid treatment, and then discharged to the outside of the used paper processing apparatus 100. The white water in the white water tank 54, which has a low degree of contamination and can be reused, is subjected to treatments such as removing ink, toner, etc. through a filter, adding a chemical as necessary and neutralizing it, and then removing the pulper 18 again. The ink is supplied to the pre-ink dilution unit 21 and can be used again.

(Control part)
The control unit controls the operation of each unit of the used paper recycling processing apparatus 100, thereby controlling the operation of the entire apparatus. For the recycled pulp unit 1, the control unit supplies water from the water supply unit 182 so that the water level of the liquid containing the waste paper raw material 6 and the water from the water supply unit 182 in the stirring tank 181 becomes a height at which the stirring blade 187 can be immersed. To control.

(Function)
The operation of the used paper processing apparatus 100 according to this embodiment will be described below. First, as shown in FIG. 2, the used paper raw material 6 of either the rough paper 66 or the shredded paper 67 is measured by the measuring unit 17, and the measured used paper raw material 6 is put into the pulper 18. Any used paper raw material 6 of the rough paper 66 and the shredded paper 67 among the used paper raw material 6 may be processed first, and is not limited to any one.

The rough paper 66 on the rough paper placing table 111 is supplied by moving the rough paper placing table 111 up and down by an elevating unit, and the uppermost rough paper 66 of the plurality of stacked coarse papers 66 is brought into contact with the paper feed roller 112. Then, the paper feed roller 112 is rotated to convey the uppermost coarse paper 66 to the tray 171 one by one. When the measured value of the measuring unit 17 reaches a predetermined value set in advance as the total weight of the used paper raw material 6 to be processed in a batch batch disaggregation process set in advance, the conveyance by the paper feed roller 112 is stopped and the tray 171 is stopped. Tilt and put it into the Pulper 18.

On the other hand, when the shredded paper 67 is processed as the waste paper raw material 6, as shown by a two-dot chain line in FIG. 2, the opening / closing member 124 is opened and the discharge device 125 is operated to cut the shredded paper 67 in the shredder tank 121. Is gradually dropped on the tray 171 and the weight of the shredded paper 67 placed on the tray 171 is measured. When the measured value of the measuring unit 17 reaches a predetermined value, the discharging device 125 is stopped, the driving means for tilting the tray 171 is driven to tilt the tray 171, and the shredded paper 67 is put into the stirring tank 181.

In the pulper 18, as the waste paper raw material 6 is put into the stirring tank 181, a part of the amount necessary for the set disaggregation process is supplied in advance from the water supply unit 182, the driving means 188 is driven, and the stirring blade 187 is driven. Rotate. Then, the waste paper raw material 6 is charged as described above, the disaggregation process is started, and while the disaggregation process is being performed, the remaining disaggregation water is gradually supplied by a predetermined amount every predetermined time. Divided into times.

Further, the disaggregation accelerator is put into the stirring tank 181 by the disaggregation accelerator supply unit 183. It is preferable that the disaggregation accelerator is supplied from the disaggregation accelerator supply unit 183 to the stirring tank 181 after a predetermined time has elapsed since the start of the input of the waste paper raw material 6. As a result, first, the waste paper raw material 6 is sufficiently swollen with water for disaggregation, and then the disaggregation accelerator can be rapidly infiltrated into the swollen waste paper raw material 6, thereby shortening the time of the disaggregation treatment.

During the disaggregation process, the water level of the liquid containing the water supplied from the water supply unit 182 stored in the agitation tank 181, the disaggregation accelerator and the waste paper raw material 6 is agitated by the agitation blades 187 a and 187 b. In the state, the upper and lower stirring blades 187a and 187b are set so as to have a height capable of being immersed. More preferably, the liquid level stored in the agitation tank 181 is continuously maintained during the disaggregation process by rotating the agitation blades 187a and 187b, and both the upper and lower agitation blades 187a. , 187b is set so as to remain immersed. That is, when the stirring blades 187a and 187b rotate, the liquid level stored in the stirring tank 181 is low in the central portion of the tank and high in the vicinity of the side walls. More preferably, the entire 187b is immersed. As a result, noise and a decrease in stirring efficiency due to rotation while the air of the stirring blade 187 is involved are avoided, and the waste paper raw material 6 in the stirring tank 181 is sufficiently brought into contact with the stirring blade 187 to perform the disaggregation processing in a short time. be able to.

In addition, the upper limit is set so that the water level becomes a predetermined level or less so that the liquid can be sufficiently stirred by the stirring blade 187 in the state where the disaggregation process has progressed and the viscosity of the liquid has increased.

For example, when the inner diameter of the stirring tank 181 is 300 mm and the height from the bottom surface of the stirring tank 181 to the upper surface of the upper stirring blade 187a is about 90 mm, all of the liquid containing water, the disaggregation accelerator, and the waste paper raw material 6 can be used. By setting the capacity to be 7 L or more, the water level of the liquid stored in the stirring tank 181 during the disaggregation process is set to about 99 mm, and the height of the upper stirring blade 187a can be immersed. Further, by setting the volume of the liquid to be 25 L or less, the water level is set to 35 mm or less, so that the entire liquid can be sufficiently stirred by the stirring blade 187 even if the small driving means 188 is used.

The density | concentration of the used paper raw material 6 in the liquid stored in the stirring tank 181 in this disaggregation process shall be about 4.5 weight%-8.0 weight%. Since the ratio of the waste paper raw materials 6 dispersed in water to each other and the ratio of the waste paper raw materials 6 and the stirring blades 187 to contact each other can be increased by setting the content to 4.5% by weight or more, the disaggregation process is shortened. It can progress efficiently in time. On the other hand, by setting the concentration of the waste paper raw material 6 to 8.0% or less, the disaggregation process proceeds and the liquid is sufficiently agitated by the small driving means 188 while suppressing the power consumption even when the viscosity is increased. Can do.

The regenerated pulp-containing liquid that has been disaggregated and manufactured at the concentration of the waste paper raw material 6 has been sufficiently disaggregated, so that the printing components are separated from the regenerated pulp. When such regenerated pulp-containing liquid is deinked in the deinking pulp section 2, the printing components can be separated and removed very efficiently, and by papermaking the deinked pulp-containing liquid obtained after deinking The recycled paper 7 to be manufactured can have a high whiteness. Therefore, even when the kneading process using the kneader is omitted, it is possible to obtain the recycled paper 7 having high whiteness.

The disintegration process is performed while gradually increasing the rotational speed of the motor constituting the driving unit 188 from about 400 rpm to about 3000 rpm, more preferably from about 400 rpm to about 2600 rpm. In the present embodiment, preferably, the water level of the liquid containing the waste paper raw material and water from the water supply unit in the stirring tank 181 is set to a height at which the liquid can immerse the entire stirring blade 187 in a state where the stirring blade 187 rotates. Since the agitation is performed, the regenerated pulp can be produced by sufficiently agitating the liquid stored in the agitation tank 181 at the number of rotations in the above range, thereby reducing power consumption.

Since the rotational speed of the stirring blade 187 was gradually increased in this way, the level of the liquid stored in the stirring tank 181 increased greatly between the central portion and the vicinity of the side wall, and the liquid was moved up and down. When a part of the stirring blades 187a and 187b is not immersed and a part of the stirring blades 187a and 187b is exposed, water is supplied from the water supply unit 182 so that the entire stirring blades 187a and 187b can be immersed. It can also be controlled. In this way, it is more preferable to set both the upper and lower stirring blades 187a and 187b so that the liquid in the stirring tank 181 is immersed in the disaggregation process.

It is preferable that the time from the introduction of the waste paper raw material 6 to the end of disaggregation is 30 minutes or more. The waste paper raw material 6 can be sufficiently disaggregated by setting it as 30 minutes or more.

During the disaggregation process in the pulper 18, if necessary, the temperature in the stirring tank 181 is detected by a temperature sensor, and the waste paper raw material 6 stored in the stirring tank 181 is included by energizing the temperature heater. The liquid is maintained at a predetermined temperature suitable for the disaggregation process.

A predetermined amount of deinking agent is supplied from the deinking agent supply unit 184 at a time before the end of the disaggregation process for a predetermined time such as about 5 minutes. By supplying the deinking agent from the deinking agent supply unit 184 at a time point a predetermined time before the end of the disaggregation process, the deinking agent is added to the recycled pulp-containing liquid by stirring for a predetermined time after adding the deinking agent. Can be sufficiently dispersed and dissolved. In addition, as in the case where the deinking agent is added at an early stage before and after the start of the disaggregation process, the generation of a large amount of bubbles during the disaggregation process can be suppressed.

The amount of the deinking agent supplied from the deinking agent supply unit 184 is preferably adjusted according to the printing rate of the waste paper raw material 6 to be processed. When the printing rate of the used paper raw material 6 is high, the supply amount of the deinking agent is increased. Conversely, when the printing rate is low, the supply amount of the deinking agent is decreased. Thereby, the obtained recycled paper 7 can have good whiteness even when the printing rate of the used paper raw material 6 to be processed is high. Further, when the printing rate of the used paper raw material 6 is low, the consumption of the deinking agent can be saved.

Further, it is preferable to adjust the disaggregation processing time according to the printing rate of the used paper raw material 6. When the printing rate is high, the disaggregation processing time is lengthened. Conversely, when the printing rate is low, the disaggregation processing time is shortened. By increasing the disaggregation processing time, more of the printing components adhering to the regenerated pulp produced in the stirring tank 181 can be peeled off from the regenerated pulp, and the deinking efficiency in the deinking pulp section 2 is improved. By doing so, the whiteness of the obtained recycled paper 7 can be increased. On the other hand, by shortening the disaggregation processing time when the printing rate is low, the production time of recycled pulp and the production time of recycled paper 7 can be shortened.

A known method can be used as a method for detecting the printing rate of the waste paper raw material 6 and is not particularly limited. For example, the printing rate is supplied from the coarse paper supply unit 11 to the measurement unit 17 using a transmission sensor (not shown). A method of detecting the printing rate from the amount of light transmitted through the rough paper 66, a method of detecting the coloration degree of the liquid in the stirring tank 181 using a CCD sensor (not shown) or the like in the pulper 18 can be used. is there.

Since the baffle plate 50 is provided in the stirring tank 181, the liquid stored in the stirring tank 181 can be sufficiently stirred, and the disaggregation processing time can be shortened.

After completion of the disaggregation process, the on-off valve 208 is opened, and the regenerated pulp-containing liquid containing the regenerated pulp produced in the pulper 18 is taken out from the regenerated pulp-containing liquid take-out section 186, and the pump 209 is driven to perform the removal shown in FIG. The ink is sent to the pre-ink dilution unit 21.

Then, immediately after taking out the recycled pulp-containing liquid from the stirring tank 181, a predetermined amount of water is supplied from the water supply unit 182. As a result, when there is regenerated pulp adhering to and remaining on the inner wall surface of the stirred tank 181 that has become empty, this regenerated pulp can be washed away so that the regenerated pulp does not remain in the stir tank 181. The water supply from the water supply part 182 after taking out the recycled pulp-containing liquid is performed by diverting a part of the water as the dilution liquid in the pre-deinking dilution part 21 which is the next step.

In the pre-deinking diluting unit 21, dilution water is supplied from the diluting solution supply unit to dilute the regenerated pulp-containing liquid so that the regenerated pulp-containing liquid has a fiber concentration suitable for the deinking process. Next, the recycled pulp containing liquid adjusted to a predetermined fiber concentration is sent to the deinking processing unit 22. The deinking process in the deinking pulp unit 22 can be omitted. When the deinking process is omitted, the pre-deinking dilution unit 21 dilutes the recycled pulp-containing liquid to a fiber concentration suitable for papermaking. After that, it is sent to the papermaking unit 3.

In the deinking processing unit 22, the regenerated pulp-containing liquid that has flowed into the regenerated pulp-containing liquid circulation tank 221 shown in FIG. 5 from the inflow portion 229 a is passed through the left or right opening of the partition wall 224 to the adjacent deinking chamber 225. Distribute sequentially. In each deinking chamber 225, fine bubbles are blown from the bubble supply unit 226 into the recycled pulp-containing liquid in the presence of the deinking agent, and toner particles are generated on the surface of the bubbles generated in large quantities without disappearing due to the presence of the deinking agent. Hydrophobic foreign matters such as the like are attached and floated on the top of each deinking chamber 225. Further, if necessary, a stirring blade is operated so as to promote smooth circulation of the recycled pulp-containing liquid in the recycled pulp circulation tank 221.

The hydrophilic fibers sequentially flow through the deinking chamber 225 together with water. In this way, deinking is performed to remove toner components and the like from the recycled pulp-containing liquid. At this time, the temperature sensor 227 detects the temperature of the regenerated pulp-containing liquid, and the heater 228 performs temperature control to heat the regenerated pulp-containing liquid so as to maintain a predetermined temperature.

After introducing the recycled pulp-containing liquid into the deinking processing unit 22, when a predetermined time elapses and the deinking process proceeds and air bubbles float above the deinking chambers 225, the motor 222a is driven to guide rails. While being guided by 222b, the blade 222 is reciprocated in the vertical direction in FIG. 5A, and the air bubbles floating above the recycled pulp-containing liquid circulation tank 221 are swept out into the bubble discharge tank 223. The bubbles swept out to the bubble discharge tank 223 are washed away by the cleaning liquid ejected from the cleaning liquid ejection section 223a, and the deinking drainage containing the cleaning liquid, the deinking agent, the toner component, etc. accumulated in the bubble discharging tank 223 is the deinking drainage. It is taken out from the take-out section 75 and sent to the deinking drain tank 53.

Deinking including the deinked pulp obtained by distributing the recycled pulp-containing liquid to all the deinking chambers 225 in the recycled pulp-containing liquid distribution tank 221 and deinking the recycled pulp-containing liquid to obtain the deinked pulp. The pulp-containing liquid is caused to flow out from the outflow portion 229b and is sent to the papermaking portion 3 as shown in FIG.

In the paper making section 3, as shown in FIG. 6, the deinked pulp-containing liquid containing deinked pulp is uniformly supplied to the mesh belt 323 running from the head box 31 while guiding it to the guide member 31b, and drained. The wet paper 64 is formed as a fiber layer containing a relatively large amount of moisture. The water flowing down below the mesh belt 323 is received by the water receiving unit 325 and sent from the water receiving unit 325 to the white water tank 54.

When the wet paper 64 on the mesh belt 323 reaches the end of the forward path, it is transferred to the water absorption belt 332a on the upper side of the dewatering unit 33. Thereafter, the water is sandwiched between the lower water-absorbing belt 332b and dehydrated by absorbing moisture contained in the wet paper 64 to the water-absorbing belts 332a and 332b, and is further squeezed by the squeezing roller 334 and dehydrated.

The wet paper 64 dehydrated by the dehydrating unit 33 is sent to the dryer unit 34 and is sandwiched between a pair of upper and lower conveying belts 342 that travel. Then, the wet paper 64 is transported while being brought into contact with a plurality of drying rollers 343 heated by the heater 345 and maintained at a predetermined temperature, whereby the wet paper 64 is dried to obtain a recycled paper 65 before finishing.

The unfinished recycled paper 65 exiting the dryer section 34 is sent to the calendar section 41 and passed between the plurality of press rollers 411. As a result, the flatness of the recycled paper 65 before finishing is improved, and the cut paper 42 is further cut into a predetermined sheet size to complete the recycled paper 7.

The broken material of the recycled paper 65 before finishing which is no longer necessary as a result of being cut in the cutting unit 42 is returned to the recycled pulp unit 1 as shown in FIG.

Of the wastewater sent to the wastewater treatment unit 5 in each step, wastewater in the deinking wastewater tank 53, which is highly contaminated and difficult to reuse, is subjected to a predetermined wastewater treatment if necessary, and then used by the used paper processing apparatus 100. Discharge to the outside. The white water in the white water tank 54 having a low degree of contamination and reusable is subjected to treatment such as removing ink components, toner components, etc. through a filter, adding chemicals, and neutralizing as necessary. It is supplied to the pre-deinking dilution unit 21 and used again.

(Experiment)
In order to test the influence of the water level of the liquid stored in the stirring tank, the recycled pulp production apparatus K according to the above embodiment is used, and the volume of the liquid made of waste paper raw material and water stored in the stirring tank is 10L, 14.3L. As the two types, the disaggregation processing was performed. The waste paper raw material to be treated was shredded paper, and the inner diameter of the stirring tank 181 was two types of 300 mm and 450 mm. The stirring blade 187 has a thickness of 2.0 mm and is provided with a stirring blade 187 made of a flat thin plate 36 having no bent portion shown in FIG. 3 and a bent portion 37b bent about 45 degrees from the flat portion 37a shown in FIG. Was installed at height positions of 30 mm and 60 mm from the bottom of the stirring tank using either one or two stages.

The water level from the water supply unit is tap water, and the water level stored in the stirring tank before the waste paper raw material is charged is 2 L, which is a height at which the stirring blade cannot be immersed in the state where stirring is performed by the stirring blade. Either 5 L or 9 L, which is a height at which the stirring blade can be continuously immersed in a state where stirring is performed by the stirring blade, was used. Then, additional water was supplied after the used paper raw material was charged, so that the concentration of the used paper raw material in the liquid composed of the used paper raw material and tap water was about 7% by weight. The rotation speed of the stirring blade was set to 400 rpm at the start of the charging of the used paper raw material, increased by 200 rpm every about 3 minutes, and increased to a maximum of 2600 rpm in about 30 minutes. No disaggregation accelerator was used. Table 1 shows the conditions of each experiment and the state of disaggregation processing such as generation of noise.

In Table 1, ◎ indicates that there is almost no noise generation and indicates a very good disaggregation state, ○ indicates that there is little noise generation and a good disaggregation state, and × indicates that a large noise is generated. , Indicates that disaggregation of raw paper raw materials is insufficient. From Table 1, the water level stored in the agitation tank as in Experiment Nos. 2, 3, 5, 7, 8, and 10 was set to a height at which the agitation blades were immersed in a state where the agitation blades were being agitated. In this case, it was found that noise and a decrease in stirring efficiency due to rotation while the air of the stirring blades is involved can be avoided, and the disaggregation state can be improved. Moreover, it turned out that the kind of stirring blade can perform the disaggregation state more favorably by the flat plate used in Experiment Nos. 1 to 5 than that having the bent portion used in Experiment Nos. 6 to 10.

K recycled pulp manufacturing apparatus S paper making apparatus 1 recycled pulp section 6 used paper raw material 8 control section 100 used paper recycling processor 181 stirring tank 182 water supply section 187 stirring blade 189 stirring means

Claims (6)

In the recycled pulp manufacturing method for manufacturing recycled pulp, stirring the used paper raw material with the water supplied from the water supply unit with the stirring blade in the stirring tank,
The level of the liquid containing water from waste paper material and the water supply unit in the stirring tank, with the stirring by the stirring blades have been made, have rows stirring the stirring blade as possible height immersed in the stirring process When the number of rotations of the stirring blade is increased, water is supplied from the water supply unit, and the stirring blade is immersed in the liquid in the stirring tank . The regenerated pulp manufacturing method of Claim 1 which stirs in the stirring tank whose internal diameter of a stirring tank is 75 mm-500 mm. Recycled pulp according to claim 1 or 2, wherein the recycled pulp is produced by setting the concentration of the used paper raw material in the liquid containing water from the used paper raw material and the water supply unit in the stirring tank to 4.5 wt% to 8.0 wt%. Pulp manufacturing method. The regenerated pulp manufacturing method according to any one of claims 1 to 3, wherein a stirring time of the liquid containing the waste paper raw material and water from the water supply unit is 30 minutes or longer. A recycled pulp part that stirs the waste paper raw material together with water supplied from the water supply part with a stirring blade in a stirring tank to produce recycled pulp,
In the regenerated pulp manufacturing apparatus provided with a control unit that controls the operation of the regenerated pulp unit,
The control unit is configured so that the water level of the liquid containing the waste paper raw material and the water from the water supply unit in the stirring tank is a height from which the stirring blade can be immersed in a state where stirring is performed by the stirring blade. Recycled pulp characterized by controlling the amount of water supply and controlling the amount of water supplied from the water supply unit to immerse the stirring blade in the liquid in the stirring tank when the rotational speed of the stirring blade is increased during the stirring process manufacturing device. A used paper recycling apparatus comprising: the recycled pulp manufacturing apparatus according to claim 5; and a papermaking apparatus for papermaking the recycled pulp-containing liquid manufactured by the recycled pulp manufacturing apparatus.

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