WO2011037116A1

WO2011037116A1 - Papermaking apparatus and papermaking method

Info

Publication number: WO2011037116A1
Application number: PCT/JP2010/066341
Authority: WO
Inventors: 嘉英杉山; 章川口; 和也山本; 晋基谷本
Original assignee: デュプロ精工株式会社
Priority date: 2009-09-25
Filing date: 2010-09-22
Publication date: 2011-03-31
Also published as: JP5499262B2; DE112010003795T5; JP2011069015A

Abstract

Disclosed is a papermaking apparatus comprising: a wet paper web forming section (32) for forming a wet paper web (64); a water removal section (33) which has a water removal belt (55) and removes water from the wet paper web (64); a drying section (34) which has a drying belt (56) and dries the wet paper web; and a transfer section (300) for transferring the wet paper web (64) from the water removal belt (55) to the drying belt (56). The transfer section (300) has at least one pair of water removal rollers (334) for holding the water removal belt (55) and the drying belt (56) therebetween and pressing the wet paper web (64) between the two belts.

Description

Paper making apparatus and paper making method

The present invention relates to a papermaking apparatus and a papermaking method, and relates to a technique for dehydrating and drying wet paper.

Conventionally, in a papermaking apparatus, wet paper obtained by papermaking from a paper raw material liquid is dehydrated and then dried. For example, in the technology disclosed in Japanese Patent Publication (H09-506937), a wet paper is sandwiched between a pair of upper and lower dewatering belts made of felt or the like and having water absorption, and this wet paper is placed between a pair of dewatering rollers. Press to dehydrate. Thereafter, the wet paper is transferred from the dewatering belt to the drying belt using a vacuum suction device or the like, and the wet paper is conveyed to the drying unit by the drying belt and dried.

However, in the technique described in the above document, a vacuum suction device is used to transfer the wet paper from the dewatering belt to the drying belt. Therefore, a large space is required to install the vacuum suction device, and the papermaking device This is the cause of the overall increase in size. In addition, the amount of power consumption required for operation increases, and transfer may not be performed reliably depending on the degree of suction. Furthermore, it cannot be said that the dewatering efficiency of the wet paper is still sufficient, and further improvement of the dewatering efficiency is desired.

The present invention solves the above-described problems, does not require a large apparatus for dehydration and transfer of wet paper, enables downsizing of the apparatus, and transports wet paper from the dewatering unit to the drying unit. It is an object of the present invention to provide a papermaking apparatus that can be reliably performed.

In order to achieve the above object, a papermaking apparatus of the present invention has a wet paper web forming unit that forms wet paper, a dehydration unit that has a dewatering belt and dehydrates the wet paper, and a drying belt. A drying section for drying the paper and a transfer section for transferring the wet paper from the dewatering belt to the drying belt. The transfer section sandwiches the dewatering belt and the drying belt and presses the wet paper between the belts. It has at least one pair of dewatering rollers for transferring the wet paper from the dewatering belt to the drying belt while dewatering.

In the papermaking apparatus of the present invention, the dewatering belt and the drying belt are endless belts, and the dewatering roller pair of the transfer portion is located on the inner side of the dewatering belt and the first dewatering roller and the drying belt. And a second dewatering roller installed at a position facing the first dewatering roller.

In the papermaking apparatus of the present invention, the dewatering unit has a water absorbing belt disposed inside the drying belt, and the water absorbing belt is endless and contacts the drying belt at least at the transition portion. The dewatering roller pair sandwiches the drying belt, the water absorption belt, and the dewatering belt.

In the papermaking apparatus of the present invention, the drying belt is characterized by comprising a water-permeable member.

In the papermaking apparatus of the present invention, the drying belt is made of a mesh member or a member having a water passage hole, and has an opening ratio of 22% to 38%.

In the papermaking apparatus of the present invention, the drying belt is made of a mesh-like member, and the mesh size is 150 mesh to 350 mesh.

In the papermaking apparatus of the present invention, the drying belt is made of a mesh member, and the thickness of the fibers constituting the mesh member is 30 μm to 50 μm in diameter.

In the papermaking apparatus of the present invention, the dewatering roller pairs are arranged at a plurality of locations along the wet paper web transport path, and the pressing force by the upstream dewatering roller pair is lower than the pressing force of the downstream dewatering roller pair. It is characterized by being.

In the papermaking apparatus of the present invention, the wet paper forming unit has a paper making wire for making wet paper from a pulp suspension.

In the papermaking method of the present invention, wet paper is made from a pulp suspension using a paper making wire, the wet paper is transferred from the paper making wire to a dewatering belt, and a dewatering belt and a drying belt are separated by a pair of dewatering rollers at the transfer portion. The wet paper is dehydrated by being sandwiched and pressed, and the wet paper is transferred from the dewatering belt to the drying belt, and the wet paper transferred to the drying belt is dried in the drying section.

According to the present invention, the dewatering belt and the drying belt are sandwiched by the pair of dewatering rollers, and the wet paper is transferred from the dewatering belt to the drying belt while dewatering by pressing the wet paper sandwiched between both belts. Therefore, the wet paper can be dehydrated and transferred at a time, and the apparatus configuration can be simplified and the apparatus can be downsized.

Also, since the dewatering roller pair presses the drying belt and water absorbing belt together with the dewatering belt to dehydrate, the water generated by the dewatering by the dewatering roller pair is absorbed by the water absorbing belt and the dewatering efficiency of the wet paper is improved. Can be made.

Since the drying belt is made of a material having water permeability, moisture generated by dehydration by the pair of dewatering rollers can be absorbed by the water absorption belt through the drying belt, and the dewatering efficiency of the wet paper can be further improved. .

Further, since the drying belt is made of a mesh member or a member having water passage holes and has an opening ratio of 22% to 38%, the wet paper can be easily transferred from the dewatering belt to the drying belt. The wet paper on the drying belt can be easily dried in the drying section.

Further, since the drying belt is made of a mesh member and the mesh size is 150 mesh to 350 mesh, the wet paper can be easily transferred from the dewatering belt to the drying belt, and the drying section The wet paper in can be easily dried.

Further, since the drying belt is made of a mesh member and the thickness of the fibers constituting the mesh member is 30 μm to 50 μm in diameter, the wet paper can be easily transferred from the dewatering belt to the drying belt, The wet paper on the drying belt can be easily dried in the drying section.

Further, a plurality of dewatering roller pairs are arranged along the wet paper web transport path, and the pressing force of the upstream dewatering roller pair is set lower than the pressing force of the downstream dewatering roller pair. The wet paper can be reliably dehydrated by reducing the moisture content of the wet paper to some extent by pressing with the pair of dewatering rollers and pressing it with a pressure higher than that of the upstream dewatering roller pair with the downstream dewatering roller pair. .

Furthermore, it is possible to efficiently dehydrate the wet paper made from the paper raw material liquid using the paper making wire and dry it to make paper.

It is a schematic block diagram of the paper manufacturing apparatus which concerns on one Embodiment of this invention. It is the schematic which shows the internal structure of the pulp suspension manufacturing part of the said papermaking apparatus. It is a perspective view of the deinking part of the papermaking apparatus. It is a top view of the deinking part. FIG. 5 is a cross-sectional view taken along line AA in FIG. 4. It is the side schematic diagram of the papermaking part of the papermaking apparatus. It is a schematic block diagram of the dehydration drying apparatus of the wet paper of the said paper manufacturing apparatus. It is a schematic block diagram of the dehydration drying apparatus of the wet paper concerning the 2nd Embodiment of this invention. It is a schematic block diagram of the dehydration drying apparatus of the wet paper concerning the 3rd Embodiment of this invention. It is a schematic block diagram of the dehydration drying apparatus of the wet paper concerning the 4th Embodiment of this invention. It is a schematic block diagram of the dehydration drying apparatus of the wet paper concerning the 5th Embodiment of this invention.

(First embodiment)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic configuration diagram of a paper making apparatus according to the present invention. In the following description, the paper manufacturing apparatus 100 is a recycled paper manufacturing apparatus using waste paper as a raw material. However, the paper manufacturing apparatus according to the present invention is not limited to this, and a paper manufacturing apparatus using other raw materials such as wood. It may be. In FIG. 1, a papermaking apparatus 100 is integrally provided with a pulp suspension manufacturing unit 1, a deinking pulp unit 2, a papermaking unit 3, a finishing unit 4, and a drainage processing unit 5.

The pulp suspension manufacturing unit 1 separates the waste paper 6 to produce recycled pulp, and the deinking pulp unit 2 deinks the recycled pulp manufactured by the pulp suspension manufacturing unit 1. The paper making unit 3 makes wet paper from the deinked pulp deinked in the deinking pulp unit 2, and dehydrates and dries the wet paper. The finishing unit 4 finishes the dried paper dried in the paper making unit 3 by cutting or the like to obtain a recycled paper 7. The liquid is processed.
(Pulp suspension manufacturing department)
FIG. 2 is a schematic diagram showing the internal structure of the pulp suspension manufacturing unit 1. The pulp suspension manufacturing unit 1 manufactures recycled pulp by separating the used paper cutting paper piece 61. The used paper feeding unit 11, the shredder 13, the metal piece removing unit 14, the pressing unit 15, the shredder tank 16, the cutting A paper amount adjusting unit 17, a pulper 18, and a kneader 19 are provided.

The used paper input unit 11 is an opening for inputting the used waste paper 6 to be processed into the hopper 12, and its structure is impossible or difficult to look into the used paper 6 in the hopper 12 from the used paper input unit 11. It is preferable that For example, by providing waste paper 6 conveying means (not shown) in the hopper 12, the waste paper 6 can be sequentially conveyed into the hopper 12 even when a large amount of waste paper 6 is loaded at once. . Thereby, the confidentiality of the document that has become the waste paper 6 can be maintained.

The shredder 13 has a cutting blade 131 that cuts the used waste paper 6 and cuts the paper into a predetermined size suitable for the production of recycled pulp. Here, if a piece of paper that has already been cut into a predetermined size is loaded from the used paper loading unit 11 by a piece of paper cutting device such as a shredder device provided separately, the shredder 13 is not provided in the hopper 12. It does not matter as a configuration. Further, although Embodiment 1 shows a case where a pulp suspension is manufactured using a piece of paper obtained by cutting with a shredder, an uncut paper can be put into a pulper as it is to manufacture a pulp suspension. Good.

Here, the pulp suspension is a liquid containing recycled pulp, water, and the like obtained by disaggregating used paper cut paper pieces 61 (used paper 6) in a stirring tank 181 described later. In the agitation tank 181, waste paper in the middle of disaggregation, printing colorants such as ink components and toner components taken out by disaggregation, and disaggregation accelerators are dissolved or mixed in the pulp suspension.

The metal piece removing unit 14 is for removing metals such as staples of a stapler and is made of a magnet or the like. The pressing portion 15 is for pressing the cut paper piece 61 in the shredder tank 16 to suppress the bulk of the cut paper piece 61. As shown by a two-dot chain line in FIG. 2, the pressing portion 15 includes a pressing member 151 that presses the cutting paper piece 61 to reduce the bulk of the cutting paper piece 61, and an elevating means 152 that raises and lowers the pressing member 151. Yes.

The shredder tank 16 temporarily stores the waste paper cutting 61 and has a bottom surface 162 that is inclined toward the discharge port 163. The discharge port 163 is provided with a discharge device 164 for discharging the waste paper cut sheet 61. There are various discharge devices 164. Here, the discharge device 164 having a structure in which a plurality of blades are arranged radially around the rotation axis is shown. A paper amount detection sensor 165 is disposed above the discharge device 164. The paper amount detection sensor 165 detects the presence or absence of a waste paper cut sheet 61 stored in the shredder tank 16, and includes a load cell, an optical sensor, and the like.

The cutting paper amount adjusting unit 17 is disposed below the discharge port 163 of the shredder tank 16, receives the waste paper cutting paper piece 61 discharged from the discharge port 163, and measures the weight of the received cutting paper piece 61. is there. Although not shown, the cutting paper piece adjusting unit 17 can be inclined from the horizontal posture toward the pulper 18, and the side wall 171 b adjacent to the pulper 18 of the cutting paper piece adjusting unit 17 is provided so as to be openable and closable toward the pulper 18. is there.

The pulper 18 disaggregates the waste paper cut paper piece 61 into fibers, that is, recycled pulp, in water and a disaggregation accelerator liquid. The stirrer tank 181 into which the waste paper cut paper piece 61 is charged, and the agitation tank 181 A water supply unit 182 for supplying water and a disaggregation promoter supply unit 183 are provided. The disaggregation accelerator supplied from the disaggregation accelerator supply unit 183 promotes disaggregation of the waste paper 6. The disaggregation accelerator includes alkalis such as sodium hydroxide, sodium carbonate, sodium silicate, potassium hydroxide, sodium sulfite and the like. Or an aqueous solution thereof selected from sulfamic acid, hydrochloric acid, sulfuric acid, phosphoric acid, aluminum sulfate, etc., sodium hypochlorite, sodium chlorite, hydrogen peroxide, etc. An oxidizing agent, a surfactant, a bleaching agent, a PH stabilizer, a chelating agent, a dispersing agent and the like can also be used supplementarily.

The disaggregation accelerator supply unit 183 is provided with a disaggregation accelerator supply port that can be opened and closed above the agitation tank 181 so that the liquid level of the pulp suspension stored in the agitation tank 181 varies with agitation. Even if it is a case, a disaggregation promoter can be thrown into the stirring tank 181 only by opening and closing each supply port.

If the disintegration accelerator supply port is formed at the bottom of the stirring tank 181, the pulp suspension in the stirring tank 181 may flow into the supply port of the disaggregation accelerator supply unit 183, and its moisture content If the used paper in the middle of disaggregation is dried and hardened due to evaporation of the material, the supply port of the disaggregation accelerator supply unit 183 may be clogged.

However, as described above, when the disintegration accelerator supply port is provided above the stirring tank 181 so that it can be opened and closed, such a situation cannot occur. The same applies to the water supply unit 182.

A stirring blade 184 is provided at the bottom of the stirring tank 181, and the stirring blade 184 is for stirring and separating the waste paper cut sheet 61 together with water supplied from the water supply unit 182. The stirring tank 181 is used for stirring. A driving unit 188 such as a motor for rotating the blade 184 is provided.

The pulp suspension stored in the stirring tank 181 contains recycled pulp, waste paper pieces 61, water, and a disaggregation accelerator. The stirring tank 181 is used for heating the pulp suspension to a predetermined temperature. A heater 186 and a temperature sensor 185 are provided. The heater 186 and the temperature sensor 185 may not be provided when temperature management is not performed.

Furthermore, a pulp suspension take-out portion 187 for taking out the pulp suspension is provided at the bottom of the stirring tank 181. The pulp suspension take-out section 187 is connected to a pipe 207a provided with a pump 209a and an on-off valve 208a, and the pulp suspension taken out from the pulp suspension take-out section 187 by the pump 209a is passed through the on-off valve 208a. This is sent to the kneader 19.

The kneader 19 separates toner components and the like mixed in the regenerated pulp from the regenerated pulp, and is constituted by a known kneader device.
(Deinking pulp section)
As shown in FIG. 1, the deinking pulp unit 2 includes a pre-deinking dilution unit 21, a deinking unit 22, and a rinsing unit 23, and a transfer unit (not shown) including a pipe, a pump, and the like is provided between each unit. Provided.

The pre-deinking diluting section 21 is a fiber concentration suitable for deinking the pulp suspension sent from the kneader 19, here about 0.1 wt% to 5.0 wt%, more preferably 0.3 wt% The liquid is diluted to about 2.0% by weight and is provided with a diluting liquid supply unit (not shown) for supplying diluting water, a surfactant as a deinking agent, and the like.

When the fiber concentration is 0.1% by weight to 5.0% by weight, the toner component and the deinking agent can be efficiently brought into contact with each other in the subsequent deinking part 22 to easily remove the toner component and the like.

3 is a perspective view of the deinking section 22, FIG. 4 is a plan view of the deinking section 22, and FIG. 5 is a cross-sectional view taken along line AA in FIG. The deinking section 22 is for producing deinked pulp by separating ink components, toner components, etc., which are printing colorants dissolved or mixed in the pulp suspension, and a pulp suspension circulation tank. 221, a blade 222 and a bubble discharge tank 223.

The pulp suspension circulation tank 221 circulates a pulp suspension containing a printing colorant adjusted to a predetermined concentration by supplying a diluent in the pre-deinking dilution unit 21. The pulp suspension circulation tank 221 is partitioned into a plurality of deinking chambers 225 by a plurality of partition walls 224. As shown in the plan view of FIG. 4, the left or right side of the partition walls 224 are alternately arranged. All the deinking chambers 225 communicate with each other by opening. A bubble supply unit 226 is provided at the bottom of each deinking chamber 225, and the bubble supply unit 226 is used to supply fine bubbles into the pulp suspension flowing through the pulp suspension distribution tank 221. is there.

Further, a stirring blade (not shown) is arranged at a predetermined position in the pulp suspension circulation tank 221 where the flow rate of the pulp suspension decreases and the pulp suspension easily stagnates. The turbid liquid is stirred with a stirring blade to flow downstream. There are various types of stirring blades, and examples include a stirring blade having a structure in which a plurality of blades are arranged radially around the rotation axis.

Further, the pulp suspension circulation tank 221 has an inflow portion 229a for allowing the pulp suspension to flow into the pulp suspension circulation tank 221, and a pulp suspension containing the deinked pulp generated after the deinking process (debinding). And an outflow portion 229b through which the ink pulp liquid) flows out of the pulp suspension circulation tank 221.

Further, a temperature sensor 227 for detecting the temperature of the pulp suspension in each deinking chamber 225 and a heater 228 are provided on the front and back surfaces of the partition wall 224, respectively, and the temperature management of the pulp suspension is performed. In the case where the temperature sensor 227 and the heater 228 are not provided, the temperature sensor 227 and the heater 228 may not be provided.

The blade 222 is for overflowing bubbles floating above the pulp suspension circulation tank 221 from the peripheral wall of the pulp suspension circulation tank 221 and sweeping them out to the bubble discharge tank 223 side. It is provided above the tank 221 and reciprocates while being guided by the guide rail 222b by driving the motor 222a.

As shown in FIG. 4, the bubble discharge tank 223 has a rectangular shape in plan view so as to surround the outer periphery of the pulp suspension circulation tank 221, and temporarily stores the bubbles swept out by the blade 222. . As shown in FIGS. 3 and 5, the bubble discharge tank 223 is provided with a cleaning liquid ejection part 223 a, and the cleaning liquid ejection part 223 a is water for washing away bubbles attached to the inner wall surface of the bubble discharge tank 223 and the blade 222. A cleaning liquid is ejected. A plurality of cleaning liquid ejection portions 223 a are provided over the entire circumference of the upper and middle steps of the inner wall surface of the bubble discharge tank 223.

Furthermore, 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, an antifoaming agent addition part for adding an antifoaming agent, a wind supply part (not shown) for supplying warm air or hot air, etc. Can be mentioned. A wind supply part blows off the water | moisture content of a bubble by spraying a warm air or a hot air on a bubble, and eliminates a bubble. When providing this wind supply part, it is more preferable that the warm air or hot air from the wind supply part is dry hot air or hot air having a low water content. Thereby, the water | moisture content of a bubble can be blown away more easily.

The rinsing section 23 shown in FIG. 1 serves to wash and remove the deinking agent in the pulp suspension that has become the deinked pulp liquid, and is composed of a known rinsing device. The rinsing unit 23 has a configuration in which waste liquid generated by rinsing the pulp suspension is sent to the rinsing drain tank 52.

The paper making unit 3 dehydrates and dries the wet paper web forming device 32 (see FIG. 6) for making the wet paper 64 from the pulp suspension that has been rinsed in the rinse unit 23, and the wet paper 64 obtained by the paper making. A dehydrating and drying device 48 (see FIG. 7).

As shown in FIG. 6, the wet paper web forming apparatus 32 is provided with a head box 31. The head box 31 has an upper opening and a pulp suspension supply port 31a formed in the lower part. Guide members 31b are cantilevered at both ends in the width direction of the pulp suspension supply port 31a, and the guide members 31b have a predetermined length along both side edges of the paper making wire 323 for making the pulp suspension. Have The guide member 31b prevents the pulp suspension supplied from the head box 31 onto the papermaking wire 323 from flowing down from the side edge of the papermaking wire 323, and sets the papermaking width of the wet paper 64 to a predetermined length. To do.

The papermaking wire 323 is stretched over a plurality of rotating rollers 321 to form an endless track. A water receiving portion 325 for receiving water flowing down from the mesh of the papermaking wire 323 is provided below the papermaking wire 323a on the upper track. The water receiving unit 325 is connected to a papermaking drain tank 54 of the drainage processing unit 5 described later.

As shown in FIG. 7, the dehydrating / drying device 48 includes a dehydrating unit 33, a drying unit 34, and a transfer unit 300. The dewatering unit 33 includes an endless dewatering belt 55 that conveys wet wet paper 64 transferred from the papermaking wire 323, a plurality of rotating rollers 331 that span the dewatering belt 55, and a plurality of pairs of dewatering rollers 334. And an endless drying belt 56 that transports the wet paper 64 transferred from the dewatering belt 55, and a water absorption belt 47 installed inside the drying belt 56.

The dehydrating belt 55 is made of, for example, a material having water absorption properties such as felt, and is stretched around a plurality of rotating rollers 331. The drying belt 56 is disposed over both the dehydrating unit 33 and the drying unit 34.

The pair of dewatering rollers 334 also serving as the transfer unit 300 holds the dewatering belt 55 and the drying belt 56 in the belt front and back direction at the contact point between the two, presses the wet paper 64 between both belts to dehydrate, The paper 64 is transferred from the dewatering belt 55 to the drying belt 56, and the first dewatering roller 44 installed inside the dewatering belt 55 and the inside of the drying belt 56, the first dewatering. It consists of a second dewatering roller 45 installed at a position facing the roller 44.

The drying belt 56 is preferably made of a material having water permeability. For example, a mesh member, a synthetic resin or a metal member in which a plurality of water passage holes (not shown) are formed can be used. The mesh member is composed of a cloth mesh made of natural fibers or synthetic fibers, a metal mesh, a natural or synthetic resin mesh, or the like. Among these, a fabric mesh made of natural fibers or synthetic fibers is particularly preferable in terms of high water permeability and durability, light weight, and low cost.

When the drying belt 56 is a mesh member or a member having water passage holes, the opening ratio is about 22% to 38% in terms of good water permeability and easy transfer of the wet paper 64. It is preferably about 26% to 28%.

Further, when the drying belt 56 is formed of a mesh member, the mesh size is, for example, 150 mesh to 350 mesh, preferably 250 mesh to 300 mesh. When the mesh size is 150 mesh or more, the mesh of the drying belt 56 is not too coarse, and the transfer of the wet paper 64 from the dewatering belt 55 to the drying belt 56 is facilitated. Further, by setting the mesh size to 150 mesh or more, the diameter of the filaments constituting the drying belt 56 becomes smaller than about 63 μm, and the thickness of the mesh member becomes thinner than about 105 μm. Moisture retained in the mesh can be reduced, and the drying time and power consumption in the drying unit 34 can be reduced. Further, by setting the mesh size to 350 mesh or less, the diameter of the filament constituting the drying belt 56 becomes larger than about 30 μm, and the thickness of the drying belt 56 becomes thicker than about 45 μm. It is possible to prevent wrinkling of the wet paper 64 caused by twisting or bending of the paper.

The water absorption belt 47 is formed endlessly from a material having water absorption properties such as felt. At least the transition portion 300 contacts the drying belt 56, and the dewatering roller pair 334 of the transition portion 300 is connected to the drying belt 56. The water absorption belt 47 and the dewatering belt 55 are sandwiched.

The dewatering belt 55, the drying belt 56, and the water absorbing belt 47 start to contact just before the upstream dewatering roller pair 334a and are separated immediately after the downstream dewatering roller pair 334b. As a result, the wet paper 64 is dehydrated to some extent while being held on the water-absorbing dehydrating belt 55, and the moisture content is slightly reduced, and the wet paper 64 comes into contact with the drying belt 56 with the moisture content lowered. The formation of the paper 64 can be stabilized.

On the other hand, the dewatering efficiency can be improved by separating both belts immediately after pressing by the dewatering roller pair 334b on the downstream side.

A plurality of pairs of dewatering rollers 334 are arranged along the conveyance path of the wet paper 64, and the pressing force by the dewatering roller pair 334a on the upstream side is preferably lower than the pressing force of the dewatering roller pair 334b on the downstream side. .

Further, as shown in FIG. 7, in order to gradually bring the dewatering belt 55, the drying belt 56 and the water absorption belt 47 closer, the dehydration belt 55, the drying belt 56 and the water absorption belt 47 are separated. The formed angle γ is a relatively small predetermined angle. As a result, the drying belt 56 and the water absorption belt 47 can gradually come into contact with the wet paper 64 carried on the dewatering belt 55.

As a result, the wet paper 64 carried on the dewatering belt 55 does not flow backward to the upstream side when contacting the drying belt and the water absorption belt, and is pushed back upstream without disturbing the fibers. It can be dehydrated while still in a uniform layer when formed with the papermaking wire 323, and the final form of the recycled paper 7 can be improved.

A water receiving tray 57 is installed below the dewatering roller pair 334 so as to receive water generated by dewatering of the dewatering roller pair 334. The water receiving tray 57 is connected to a papermaking drain tank 54 of the drainage processing unit 5 described later.

The drying unit 34 includes a hood 49, and a drying belt 56 is wound around the plurality of rotating rollers 351 and the drying roller 343 inside the hood 49. Further, a sandwiching belt 342 is disposed inside the hood 49, and the sandwiching belt 342 travels with the wet paper web 64 sandwiched between the drying belt 56 in a section in contact with the drying belt 56. .

The clamping belt 342 is made of, for example, cloth, heat-resistant resin, metal, or the like, but water permeability like the drying belt 56 is not necessarily required. The plurality of drying rollers 343 include a heater 345 therein, and have 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 includes a calendar unit 41 and a cut unit 42, and the calendar unit 41 includes a plurality of press rollers (not shown) for increasing the flatness of the paper, and the cut unit 42 includes a cutting blade (not shown) for cutting the 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, a rinsing drainage tank 52, and a papermaking drainage tank 54, and the drainage in the deinking drainage tank 53 is contaminated. Since it is high and difficult to reuse, it is discharged to the outside of the paper making apparatus 100 after detoxifying by performing a predetermined waste liquid treatment if necessary.

The wastewater in the papermaking wastewater tank 54 and the rinsing wastewater tank 52 has a low degree of contamination and can be reused. Therefore, treatment such as removing ink, toner, etc. through a filter and neutralizing by adding chemicals as necessary. Is applied to the pulper 18, the pre-deinking diluting section 21 and the like again.
(Operation of the first embodiment)
The operation of the paper making apparatus 100 according to the present embodiment will be described below. First, as shown in FIG. 2, when the used paper 6 is put into the hopper 12 from the used paper input unit 11, the shredder 13 cuts the used paper 6 into pieces of a predetermined size suitable for the production of recycled pulp and cuts the paper. Formed as a paper piece 61, the metal piece removing section 14 removes metals such as staples of a stapler. Then, the cut paper pieces are temporarily stored in the shredder tank 16.

When storing a certain amount or more of the cut paper piece 61 of the used paper in the shredder tank 16, as shown by a two-dot chain line in FIG. The bulkiness of the paper piece 61 is reduced.

Next, the discharge device 164 is operated to gradually drop the used cut paper piece 61 onto the cut paper amount adjusting unit 17 and measure the weight of the dropped cut paper piece 61. When the value obtained by the measurement reaches the set value, the discharge device 164 is stopped, the cutting paper amount adjusting unit 17 is inclined from the horizontal posture toward the pulper 18, and the side wall 171b is inclined to cut the used paper. The paper piece 61 is put into the stirring tank 181.

In the pulper 18, before the waste paper cutting paper piece 61 is put into the stirring tank 181, an amount of water corresponding to the amount of the waste paper cutting paper piece 61 to be fed is supplied in advance from the water supply unit 182, and driving means The stirring blade 184 is rotated by 188 to stir the water in the stirring tank 181.

In such a state, the waste paper cut sheet 61 is put into the stirring tank 181 as described above. Thereby, the waste paper cutting piece 61 and water can be easily mixed. And a disaggregation promoter is thrown into the stirring tank 181 from the disaggregation promoter supply part 183. The disaggregation accelerator is preferably introduced after a predetermined time has elapsed after the waste paper cut sheet 61 is introduced. Thereby, first, the cutting paper piece 61 can be sufficiently swollen with water, and then the disaggregation accelerator can be rapidly infiltrated into the swollen cutting paper piece 61, so that the time of the disaggregation process can be shortened.

Then, the waste paper cut sheet 61 is stirred in the stirring tank 181 by the rotation of the stirring blade 184 to form a pulp suspension. During this time, if necessary, the temperature sensor 185 detects the temperature in the agitation tank 181, energizes the temperature heater 186 to heat the pulp suspension, and maintains the pulp suspension at a predetermined temperature suitable for the disaggregation treatment. However, the temperature management in the pulper 18 is not necessarily performed and may not be performed.

Increasing the residence time in the pulper 18 increases the degree of disaggregation of the waste paper cut paper piece 61, and conversely shortens the degree of disaggregation of the waste paper 6. For this reason, the degree of disaggregation of the pulper 18 can be set to an arbitrary degree by variably adjusting the operation time per unit processing amount. As a result, it becomes possible for the user to produce recycled paper by arbitrarily selecting whether the reduction in processing time is important or the quality of the obtained recycled paper 7 is important.

The pulp suspension containing the regenerated pulp is taken out from the pulper 18 from the pulp suspension take-out part 187, and then the pulp suspension is sent to the kneader 19 to knead the regenerated pulp. As shown in FIG. 1, it is sent to the deinking pulp section 2.

In the deinking pulp section 2, first, dilution water and a surfactant as a deinking agent are introduced from the dilution liquid supply section in the pre-deinking dilution section 21 so that the pulp suspension has a fiber concentration suitable for deinking. Then, the pulp suspension is diluted.

Next, the pulp suspension adjusted to a predetermined fiber concentration is sent to the deinking unit 22. As shown in FIGS. 3 and 4, in the deinking section 22, the pulp suspension that has flowed into the pulp suspension circulation tank 221 from the inflow section 229 a is removed from the left or right opening of the partition wall 224. Distribute sequentially to the ink chamber 225. In each deinking chamber 225, fine bubbles are blown from the bubble supply unit 226 into the pulp suspension in the presence of the deinking agent, and the toner is applied to the surface of the bubbles generated in large quantities without disappearing due to the presence of the deinking agent. Hydrophobic foreign matters such as particles 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 pulp suspension in the recycled pulp circulation tank 221.

親水 Hydrophilic fibers are sequentially distributed through the deinking chamber 225 together with water. In this way, deinking is performed to remove toner components and the like from the pulp suspension. At that time, if necessary, the temperature sensor 227 detects the temperature of the pulp suspension, and the heater 228 heats the pulp suspension to maintain a predetermined temperature. The temperature management in the deinking unit 22 is not always necessary and may not be performed.

After introducing the pulp suspension into the deinking section 22, when a predetermined time elapses and bubbles are floating above the deinking chambers 225 due to the progress of the deinking process, the motor 222a is driven and the guide rails are driven. The blade 222 is reciprocated while being guided by 222 b, and air bubbles floating above the pulp suspension 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 223 a, and the liquid containing the cleaning liquid, the deinking agent, the toner component, etc. accumulated in the bubble discharge tank 223 is transferred to the deinking drain tank 53. Sent.

The pulp suspension is circulated through all the deinking chambers 225 in the pulp suspension distribution tank 221, and deinked pulp is obtained by deinking the pulp suspension. The obtained pulp suspension containing deinked pulp (deinked pulp liquid) is discharged from the outflow part 229b and sent to the rinsing part 23, and the rinsing part 23 jets the cleaning liquid to deink the pulp suspension. Wash out the agent. The deinked pulp that has been rinsed is sent to the papermaking unit 3 after adjusting the fiber concentration in the pulp suspension to be about 0.3 to 1.0% by weight. The liquid generated by the rinse is rinsed It is sent to the drain tank 52.

In the wet paper forming device 32 of the paper making unit 3, the pulp suspension containing the deinked pulp after deinking is uniformly supplied from the head box 31 to the guide paper 31b on the traveling paper making wire 323, and drained. Thus, the wet paper 64 which is a fiber layer containing a relatively large amount of moisture is formed. The water that flows down below the papermaking wire 323 is received by the water receiving unit 325 and sent from the water receiving unit 325 to the papermaking drain tank 54.

When the wet paper 64 on the paper making wire 323 reaches the inclined surface of the terminal portion of the upper paper making wire 323a, the wet paper 64 is transferred to the dewatering belt 55 as shown in FIG. Thereafter, the wet paper 64 is sandwiched between the dewatering belt 55, the drying belt 56 and the water absorbing belt 47, and pressed by the dewatering roller pair 334 via the dewatering belt 55 and the drying belt 56, so The water contained in 64 is dehydrated.

The water generated by the dehydration is absorbed by the dewatering belt 55 from the upper surface of the wet paper web 64 when the dewatering belt 55 has water absorption. Further, when the drying belt 56 has water permeability, the drying belt 56 passes through the lower surface of the wet paper 64 and is then absorbed by the water absorption belt 47. Excess moisture exceeding the water absorption capacity of the dewatering belt 56 and the water absorbing belt 47 is received by the water receiving tray 57, and the water in the water receiving tray 57 is sent to the papermaking drain tank 54.

The wet paper 64 is transferred from the dewatering belt 55 to the drying belt 56 by pressing by the dewatering roller pair 334. When pressing by the dewatering roller pair 334, the moisture content of the wet paper 64 is generally higher at the time of pressing by the upstream dewatering roller pair 334a than when pressed by the downstream dewatering roller pair 334b. When the pressing force of the upstream dewatering roller pair 334a is set to a pressure lower than the pressure of the downstream dewatering roller pair 334b, the water generated by the pressing slightly flows out of the upstream dewatering roller pair 334a to the downstream side. By doing so, it is possible to prevent the fiber component in the wet paper 64 from flowing back to the upstream side from the dewatering roller pair 334a, and to form a uniform fiber layer to realize a good formation.

On the other hand, it is preferable that the upstream dewatering roller pair 334a is pressed at a relatively low pressure and dehydrated to some extent, and then the downstream dewatering roller pair 334b is pressed at a higher pressure than the upstream dewatering roller pair 334a. While maintaining the formation, the paper can be efficiently dehydrated, and the strength of the recycled paper obtained after the wet paper 64 is dried and finished can be improved.

Further, the dewatering belt 55 and the water absorption belt 47 in a state of containing a lot of water can be dehydrated by pressing with a relatively high pressure by the dewatering roller pair 334b on the downstream side.

As a result, when the dewatering belt 55 and the water absorbing belt 47 are separated from each other and reach the upstream side of the conveyance path of the wet paper 64, the dewatering belt 55 and the water absorbent belt 47 come into contact with the wet paper 64 with high water absorption capability. Therefore, the dewatering efficiency of the wet paper 64 can be improved.

The wet paper 64 transferred to the drying belt 56 is conveyed to the drying unit 34, abuts against the sandwiching belt 342 in the hood 49, and is sandwiched between the sandwiching belt 342 and the drying belt 56. Then, the wet paper 64 is conveyed while being in contact with the plurality of drying rollers 343 that are heated by the heater 345 and maintained at a predetermined temperature via the drying belt 56 and the sandwiching belt 342, so that the wet paper 64 is dried. Is performed to obtain the recycled paper 65 before finishing.

As shown in FIG. 1, the unfinished recycled paper 65 exiting the drying unit 34 is sent to the calendar unit 41 and passed between a plurality of press rollers to improve the flatness. The finished paper 7 is cut to the size of.

As shown in FIG. 1, the broken material of the recycled paper 65 before finishing which is no longer necessary due to the cutting at the cutting unit 42 is returned to the shredder 13 or the shredder tank 16 and used again for the production of recycled paper.

Of the wastewater sent from each process to the wastewater treatment unit 5, the wastewater in the deinking wastewater tank 53 is highly contaminated and difficult to reuse. The paper is discharged outside the paper manufacturing apparatus 100. The drainage in the papermaking drainage tank 54 and the rinsing drainage tank 52 has a low degree of contamination and can be reused. Therefore, if necessary, ink components, toner components, etc. are removed through a filter and neutralized by adding chemicals. After the processing such as the above, it is supplied to the pulper 18, the pre-deinking diluting unit 21 and the like and used again.

As described above, the wet paper web dehydrating and drying apparatus 48 according to the present invention has the wet paper web sandwiched between both belts by the dewatering roller pair 334 pressing the wet paper 64 via the dewatering belt 55 and the drying belt 56. 64 is transferred from the dewatering belt 55 to the drying belt 56 while dewatering, so that the wet paper 64 can be dewatered and transferred simultaneously by pressing the dewatering roller pair 334, and the wet paper carried on the dewatering belt 55 can be removed. Since the paper 64 can be easily and reliably transferred to the drying belt 56, a vacuum suction device or the like is not required, and the dehydration drying device 48 can be downsized.

Further, since the dewatering roller pair 334 presses the drying belt 56 and the water absorbing belt 47 together with the dewatering belt 55, when the wet paper 64 is transferred from the dewatering belt 55 to the drying belt 56, the dewatering roller pair 334. Water generated by the pressing of 334 can be absorbed by the water absorption belt 47, and the dewatering efficiency of the wet paper 64 can be significantly improved.

When the drying belt 56 is made of a water-permeable member, moisture generated by the dehydration by the dewatering roller pair 334 can be removed through the drying belt 56, and the dewatering efficiency can be improved.
(Second Embodiment)
A second embodiment of the wet paper dewatering and drying apparatus of the papermaking apparatus according to the present invention will be described below. In the following embodiment, the description of the same configuration as that of the first embodiment is omitted. FIG. 8 is a schematic configuration diagram of a wet paper web dehydrating and drying apparatus 48A according to the second embodiment.

In the first embodiment described above, the drying belt 56 and the water absorbing belt 47 begin to contact the dewatering belt 55 simultaneously at a position immediately before the upstream dewatering roller pair 334a. However, in the second embodiment, the position at which the drying belt 56a starts to contact the dewatering belt 55a is different from the position at which the water absorption belt 47a starts to contact the dewatering belt 55a. The drying belt 56a starts to contact the dewatering belt 55a on the upstream side of the transport path of the wet paper 64 from the position where the 47a starts to contact the dewatering belt 55a.
(Third embodiment)
In the wet paper dewatering / drying device 48B according to the third embodiment shown in FIG. 9, the dewatering belt 55b is located downstream from the contact point with the papermaking wire 323 to the upstream dewatering roller pair 334a in the conveying direction. Inclined downward from the horizontal direction toward the side. For this reason, the angle formed between the conveyance surface of the wet paper 64 in the paper making wire 323 and the conveyance surface of the wet paper 64 in the dewatering belt 55b is α.

On the other hand, the dehydrating belt 55 in the first embodiment has the entire conveying surface of the wet paper 64 installed substantially horizontally, and the conveying surface of the wet paper 64 in the paper making wire 323 and the dehydrating belt 55 are disposed. The angle formed with the conveyance surface of the wet paper 64 is θ, and the angle α in the third embodiment is smaller than the angle θ.

These angles α and θ are conveyed along the outer periphery of the rotating roller 331b when the wet paper 64 is transferred from the paper making wire 323 to the dewatering belt 55, as shown in an enlarged manner in FIG. This corresponds to the angle of bending. Therefore, by making the angle α smaller than the angle θ, the range in which the wet paper 64 is curved along the outer periphery of the rotating roller 331b is shortened, and the compression or expansion generated on the front and back surfaces of the wet paper 64 is relaxed. It is possible to reduce the occurrence of cracks in the interior. As a result, damage to the wet paper 64 during the transfer can be reduced, and the paper obtained after drying is less likely to cause wrinkles.
(Fourth embodiment)
In the wet paper web dehydrating and drying apparatus 48D as the fourth embodiment shown in FIG. 10, the dewatering belt 55d is disposed between the entire conveying surface carrying the wet paper 64 and the drying belt 56d. The conveyance surface in the clamping range is disposed to be inclined upward from the horizontal direction toward the downstream side in the conveyance direction. The location where the wet paper 64 is transferred from the paper making wire 323d to the dewatering belt 55d is a horizontal portion of the upper track of the paper making wire 323d.

In the fourth embodiment, the angle β formed by the conveyance surface of the wet paper 64 in the papermaking wire 323d and the conveyance surface of the dewatering belt 55d is relatively small, particularly smaller than the angle θ of the first embodiment. As in the third embodiment, the wet paper 64 is curved while being transferred along the outer periphery of the rotating roller 331d during the transition, and is compressed and expanded inside the wet paper 64. It is possible to reduce the occurrence of cracks.

Further, since the wet paper 64 is transferred in the horizontal portion of the paper making wire 323d, the transfer does not occur even if the paper making wire 323d is not formed with an inclined surface inclined downward in the conveyance direction as in the first to third embodiments. The angle α formed by the front and rear conveying surfaces can be reduced. If the wet paper 64 is transferred at the horizontal portion of the paper making wire 323d as described above, the number of the rotating rollers 321d around which the paper making wire 323d is passed can be reduced, and the manufacturing cost can be saved and the occupied area can be reduced.
(Fifth embodiment)
In the wet paper dewatering and drying device 48E as the fifth embodiment shown in FIG. 11, the drying unit 34e is disposed above the paper making unit 32e and the dehydrating unit 33e, and the drying belt 56e is disposed above the dewatering belt 55e. Arranged above.

The dewatering belt 55e is arranged so as to circulate in a substantially triangular shape, and the dewatering belt 55e is in contact with the drying belt 56e and the water absorbing belt 47e on the inclined conveying surface, and the wet paper web is interposed via both belts. A dehydrating roller pair 334e for pressing 64 is provided.

Thus, the wet paper 64 transferred from the paper making wire 323e to the dewatering belt 55e is first carried on the dewatering belt 55e and conveyed in a substantially horizontal direction, and then conveyed with the conveying direction changed upward, and then dried. The belt 56e and the water-absorbing belt 47e are in contact with each other, are sandwiched between the dewatering belt 55d, the drying belt 56e, and the water-absorbing belt 47e, and are pressed by the dewatering roller pair 334e.

The wet paper dewatering / drying device 48E according to the fifth embodiment has the paper making unit 32e, the dewatering unit 33e, and the drying unit 34e arranged in the vertical direction, so that the wet paper dewatering / drying device 48E has a horizontal length. It can be shortened.

In each of the above-described embodiments, the water absorption belt 47 is provided inside the drying belt 56. However, the wet paper dewatering and drying apparatus according to the present invention is not limited to this, and the water absorption belt is not installed. Alternatively, a water absorbing roller such as a roller having a water absorbing layer formed on the outer peripheral surface may be provided instead of the water absorbing belt 47.

In the first embodiment, the paper making apparatus 100 provided with the deinking pulp unit 2 is shown. However, the present invention is not limited to this, and the deinking pulp unit 2 may not be provided. Thus, when the deinking pulp section 2 is not provided, and the paper making apparatus is a recycled paper manufacturing apparatus using waste paper as a raw material, the pulp suspension supplied to the head box and made by the paper making wire is The colorant for printing is contained.

Claims

A wet paper web forming section for forming a wet paper web, a dehydrating section having a dewatering belt for dewatering the wet paper web, a drying section having a drying belt for drying the wet paper web, and the wet paper web from the dewatering belt. The transfer section includes a transfer section that transfers to the drying belt. The transfer section sandwiches the dewatering belt and the drying belt, presses the wet paper between both belts to dehydrate, and transfers the wet paper from the dewatering belt to the drying belt. A papermaking apparatus having at least one pair of dewatering rollers to be transferred.
The dewatering belt and the drying belt are endless belts, and the pair of dewatering rollers at the transition portion are disposed inside the dewatering belt, and the first dewatering roller is disposed inside the drying belt. The paper making apparatus according to claim 1, further comprising a second dewatering roller installed at a position opposite to the paper.
The dewatering unit has a water absorbing belt disposed inward of the drying belt, the water absorbing belt is endless and contacts at least the drying belt at the transfer unit, and the dehydrating roller pair of the transfer unit is the drying belt The paper making apparatus according to claim 2, wherein the water absorbing belt and the dewatering belt are sandwiched.
The papermaking apparatus according to claim 1, wherein the drying belt is made of a material having water permeability.
2. The papermaking apparatus according to claim 1, wherein the drying belt is made of a mesh member or a member in which a water passage hole is formed, and has an opening ratio of 22% to 38%.
2. The papermaking apparatus according to claim 1, wherein the drying belt is made of a mesh-like member, and the mesh size is 150 mesh to 350 mesh.
2. The papermaking apparatus according to claim 1, wherein the drying belt is made of a mesh member, and the thickness of the fiber constituting the mesh member is 30 μm to 50 μm in diameter.
The dewatering roller pairs are disposed at a plurality of locations along the wet paper web transport path, and the pressing force of the upstream dewatering roller pair is lower than the pressing force of the downstream dewatering roller pair. Item 2. A papermaking apparatus according to Item 1.
The papermaking apparatus according to claim 1, wherein the wet paper forming unit has a paper making wire for making wet paper from a pulp suspension.
Wet paper is made from the pulp suspension by the paper making wire, and the wet paper is transferred from the paper making wire to the dewatering belt. A papermaking method, wherein the wet paper is transferred from the dewatering belt to the drying belt, and the wet paper transferred to the drying belt is dried in a drying section.