JP5656739B2 - Waste paper recycling processor - Google Patents

Description

  The present invention relates to a used paper recycling processing apparatus that can be installed in an office or the like where waste paper is generated to recycle the paper, and more particularly relates to a technology related to paper thickness control at the initial stage of paper making.

  Conventionally, in waste paper recycling equipment, pulp suspension containing recycled pulp is poured into the paper making wire in the paper making section to make wet paper, and the wet paper is transferred from the paper making wire to the felt belt in the dewatering section and dewatered by the felt belt. Then, after drying in the drying section, it is transferred to the finishing section.

  As a prior art document related to the papermaking technology, for example, there is Patent Document 1. This relates to a method for producing a tissue product, comprising a step for producing a tissue web. In the process, the tissue web is dehydrated and then transferred from the transfer conveyor to the fabric using aerodynamic forces such as suction.

Special table 2008-524457

By the way, a wet paper web that is continuous in a belt shape is made dry in the drying section, and then when the dry paper is transferred from the drying section to the finisher, the tip of the paper is peeled off from the drying section by a scraper.
However, when the wet paper does not transfer well from the papermaking wire to the felt belt, the leading edge of the wet paper is torn off, and the leading edge of the wet paper transferred to the felt belt is linear in the paper width direction. It has a jagged fracture shape in which a protruding region protruding forward in the paper conveyance direction and a retracted region retracting backward are mixed without having a shape.

  For this reason, when the dry paper is peeled off from the drying section with the scraper, a part of the leading edge of the paper is peeled off by the scraper, and the other part enters the back side of the scraper, and the leading edge of the paper is scraped by the scraper. It was torn and caused a paper jam.

  The present invention solves the above-mentioned problems, and the used paper has a shape in which the wet paper smoothly transitions from the paper making wire to the felt belt without breaking, and the leading edge of the dry paper after drying is aligned in the paper width direction. An object is to provide a reproduction processing apparatus.

  In order to solve the above-described problems, a used paper recycling processing apparatus according to the present invention includes a paper making unit that forms one processing unit among a plurality of processing units constituting a used paper recycling processing system, and a control that controls the operation of each processing unit. In the used paper recycling processing apparatus, the paper making unit has a paper making wire part for making wet paper from the pulp suspension, and a head box part for supplying the pulp suspension to the paper making wire part. The initial stage of paper making by controlling the paper making section and making the paper thickness of the wet paper leading edge area, which is the paper making initial area, with a paper making initial thickness thicker than the paper book setting thickness set in the wet paper book area following the wet paper leading edge area It has a control function part.

  In the used paper recycling apparatus of the present invention, the head box unit has a head box for pouring a pulp suspension onto the paper making wire of the paper making wire unit, and a pulp suspension supplying device for supplying the pulp suspension to the head box. The paper making initial control function part of the control unit sets the supply amount of the pulp suspension according to the paper making initial set thickness to the paper making set thickness while making the paper making initial region for a predetermined time from the start of paper making. Accordingly, the initial supply amount is controlled to be larger than the main supply amount of the pulp suspension to be supplied.

  In the used paper recycling apparatus of the present invention, the papermaking wire section has a papermaking wire that receives the pulp suspension poured from the headbox section, and a papermaking wire drive device that drives the papermaking wire in the paper transport direction, and the papermaking wire of the control section The initial control function section moves the paper making wire movement speed driven according to the paper making book set thickness during paper making in the paper making initial area for a predetermined time from the start of paper making. It is characterized by controlling the paper making wire initial moving speed slower than the speed.

  In the used paper recycling apparatus of the present invention, the papermaking wire section has a papermaking wire that receives the pulp suspension poured from the headbox section, and a papermaking wire drive device that drives the papermaking wire in the paper transport direction, and the papermaking wire of the control section The initial control function unit is characterized in that the paper making wire is stopped for a predetermined time from the start of paper making to make the paper making initial region to the paper making initial set thickness.

  As described above, according to the present invention, the paper thickness of the wet paper leading end area, which is the initial paper making area, is set to a paper making initial thickness that is thicker than the paper book set thickness set in the wet paper book area following the wet paper leading area. By doing so, the non-uniformity of the wet paper thickness at the initial stage of paper making can be alleviated, and the tear strength of the paper at various locations in the paper width direction can be made uniform.

  For this reason, the wet paper is smoothly transferred from the paper making wire to the felt belt without breaking, and the transferred paper has a linear shape in which the leading edge of the wet paper is aligned in the paper width direction. The leading edge of the paper can be uniformly peeled off by the scraper along the paper width direction, and the leading edge of the dry paper causing the paper jam can be prevented from being broken.

The block diagram which shows the used paper reproduction | regeneration processing apparatus in embodiment of this invention The block diagram which shows the control part of the used paper reproduction | regeneration processing apparatus in the embodiment Schematic diagram showing the pulper unit of the used paper recycling apparatus in the embodiment Schematic diagram showing the paper making section of the used paper recycling apparatus in the same embodiment Schematic diagram showing the finish of the used paper recycling apparatus in the same embodiment

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 5, the used paper recycling processing apparatus has a plurality of processing units constituting a used paper recycling processing system. The processing unit includes a paper feeding unit 1, a pulper unit 9, a storage tank unit 10, a deinking unit. There are a section 11, a paper making section 13, a drying section 14, a finishing section 15, a white water tank section 100, and a wastewater treatment tank section 101. In addition, the used paper recycling apparatus includes a control unit 700 that controls the operation of each processing unit.

  The paper supply unit 1 supplies recycled paper 4 as a recycled raw material. The storage unit 3 stores paper pieces 2 obtained by chopping the used paper 4, the paper supply device 5 supplies the used paper 4 to the storage unit 3, and storage. A discharge cyclone 7 for discharging the paper piece 2 stored in the unit 3 to the measuring unit 6, a paper piece transfer duct 16 for transferring the paper piece 2 of the storage unit 3 to the discharge cyclone 7, and air for transfer to the paper piece transfer duct 16 And a blower device 18 that generates an air flow 17 that flows from the storage unit 3 toward the discharge cyclone 7.

  The pulper unit 9 separates the paper piece 2 and prepares recycled pulp. The pulper unit 9 has a pulper tank 37 and a stirring device 38 provided in the pulper tank 37, and disaggregates the paper piece 2 weighed in the weighing unit 6. Thus, a pulp suspension 8 containing regenerated pulp is produced.

The storage tank unit 10 stores the pulp suspension 8 obtained in the pulper unit 9 and has a stirring device 39 inside.
The deinking unit 11 prepares deinked pulp by deinking the pulp suspension 8 stored in the storage tank unit 10, and includes a deinking tank 40 having a meandering flow path, and a deinking tank. And an air diffuser (not shown) for discharging a large number of bubbles from the lower part of 40.

  The paper making unit 13 makes the wet paper 12 from the deinked pulp suspension 8 and includes a paper making wire portion and a head box portion. The papermaking wire section includes a papermaking wire 43 formed of a mesh belt wound around a plurality of rollers 42, and a papermaking machine such as a motor that rotates at least one of the rollers 42 to drive the papermaking wire 43 in the paper conveyance direction. A wire driving device 431 is included.

  The head box unit includes a head box 44 that pours the deinked pulp suspension 8 onto the papermaking wire 43, and a pulp suspension such as a pump that supplies the pulp suspension 8 to the head box 44 from the deinking tank 40. A supply device 110 is included.

  The dewatering unit 20 dehydrates the wet paper 12 and includes a felt water absorbing belt 47 wound around a plurality of rollers 46, and the wet paper 12 is transferred from the paper making wire 43 to the water absorbing belt 47. Absorbs and dehydrates the wet paper 12.

  The drying unit 14 dries the dehydrated wet paper 12, and winds a metal first conveying belt 51 around a drying roller 49 and a plurality of rollers 50 each including a heating device 48, and a plurality of rollers 52. The second transport belt 53 made of resin is wound around the net, and the first transport belt 51 and the second transport belt 53 overlap on the outer peripheral surface of the drying roller 49 with the wet paper 12 interposed therebetween. The wet paper 12 is dried.

  The pair of pressing rollers 46 a and 50 a squeezes and dehydrates the wet paper 12 through the water absorption belt 47 and the first conveyance belt 51, and transfers the wet paper 12 from the water absorption belt 47 to the first conveyance belt 51.

The dried dry paper 61 is separated from the first transport belt 51 by the scraper 111 at the forward end position of the first transport belt 51 and guided to the finish 15.
The finishing unit 15 performs a finishing process on the dry paper 61 obtained by drying the wet paper 12, and discharges the obtained recycled paper 62 to the paper receiving unit 63. A metal cutter device 60 and a slitter device 112 are provided.

  As shown in FIG. 5, the slitter device 112 has a pair of upper and lower rotating shafts 113, 114. Each rotating shaft 113, 114 has a main transport roller 115, 116, a sub transport roller 117, 118, and a rotary blade. 119 and 120 are provided. The sub-transport rollers 117 and 118 are provided on the left and right sides of the main transport rollers 115 and 116, and the rotary blades 119 and 120 are disposed between the main transport rollers 115 and 116 and the sub-transport rollers 117 and 118.

  The main transport rollers 115 and 116 and the sub transport rollers 117 and 118 are rotationally driven with the dry paper 61 interposed therebetween to transport the dry paper 61 in the paper transport direction. The rotary blades 119 and 120 slide with their blade edges overlapping in the axial direction of the rotary shafts 113 and 114 to cut both side edges of the dry paper 61 in the paper width direction.

  With this configuration, cutting is performed while applying a conveying force to the dry paper 61, and the conveying force acts on the recycled paper 62 and the cutting waste 61a after the cutting, whereby paper jamming in the slitter device 112 can be suppressed.

  As shown in FIG. 1, the waste water treatment tank unit 101 processes the deinking waste liquid flowing from the deinking unit 11 through the deinking drainage system 102, removes fibers, ink, and toner with a filter, and adds chemicals Thus, the water is neutralized and treated to the quality of water that can be discharged into the sewage pipe 103 of the public sewage.

  The white water tank unit 100 stores white water, which is wastewater containing recycled pulp flowing from the paper making unit 13 through the paper making drainage system 104, and returns the white water to various parts of the used paper recycling processing system through the white water return systems 105 and 106. .

  A water supply source, here, a water supply pipe 108 for supplying water from a water supply pipe 107 is connected to the pulper unit 9, and a main valve device 109 for emergency stop including an electromagnetic valve is provided in the water supply pipe 108.

  As illustrated in FIG. 2, the control unit 700 includes the following functional units as functional circuits set in the CPU 710. That is, a pulper unit control function unit 711 that controls the operation of the pulper unit 9, a deinking unit control function unit 712 that controls the operation of the deinking unit 11, and a papermaking unit control function unit 713 that controls the operation of the papermaking unit 13. And a finishing control function unit 714 that controls the operation of the finishing unit 15, a wastewater treatment tank unit control function unit 715 that controls the operation of the wastewater treatment tank unit 101, and an operation process from the start of operation to the stop of operation. An automatic operation control function unit 716 and a papermaking initial control function unit 717.

  The paper making initial control function unit 717 controls the paper making unit 13 so that the paper thickness of the wet paper leading end area, which is the paper making initial region, is thicker than the paper book setting thickness that is set in the wet paper book region that follows the wet paper leading end region. The paper making control is performed at the initial paper making thickness.

  As an example of this control, the pulp suspension supply device 110 is controlled, and the pulp suspension supply amount to be supplied according to the initial papermaking thickness during the papermaking initial region for a predetermined time from the papermaking start. Is controlled to an initial supply amount larger than the main supply amount of the pulp suspension to be supplied in accordance with the papermaking main set thickness.

  As another example of control, the paper making wire driving device 431 is controlled to move the paper making wire 43 driven according to the paper making initial set thickness while making the paper making initial region for a predetermined time from the paper making start. Is controlled to an initial moving speed of the papermaking wire that is slower than the moving speed of the papermaking wire driven according to the set thickness of the papermaking book.

  As another example of control, the paper making wire driving device 431 is controlled to stop the driving of the paper making wire 43 for a predetermined time from the start of paper making to control the paper making initial region to the paper making initial thickness. There is.

Further, there is a technique that is performed by combining a plurality of the above examples.
The operation of the above configuration will be described below.
In the operation of performing the used paper recycling process, the automatic operation control function 716 of the control unit 700 includes the recycled pulp unit control function unit 711, the deinking pulp unit control function unit 712, the paper making unit control function unit 713, the finishing unit control function unit 714, the drainage The processing unit control function unit 715 is activated, and the pulper unit 9, the deinking unit 11, the paper making unit 13, the finishing unit 15, and the wastewater treatment tank unit 101 are controlled to operate the used paper recycling processing system in each processing unit described above. Do.

  By the way, in the paper making unit 13, the adsorption force at which the wet paper 12 is transferred from the paper making wire 43 to the water absorption belt 47 is caused by the water absorption of the water absorption belt 47, and the adsorption force acts as the paper thickness of the wet paper 12 decreases. Conversely, as the paper thickness of the wet paper 12 is thicker, the adsorption force is more likely to act, and as the water absorption of the water absorption belt 47 is higher, the wet paper 12 is strongly adsorbed and the certainty of transfer is increased.

  The water absorbency of the water absorbing belt 47 is related to the drainage of the water absorbing belt, and the better the drainage, the better the water absorbency. Whether the drainage is good or bad is related to the thickness of the fibers constituting the felt. The thicker the fibers, the better the drainage. Accordingly, the adsorption force of the water absorbing belt 47 can be adjusted by appropriately selecting the thickness of the felt fiber.

  In addition, the pulp suspension 8 flowing out on the paper making wire 43 at the initial stage of paper making spreads unevenly in the paper conveying direction of the paper making wire 43, so that the paper thickness of the wet paper 12 becomes non-uniform in the paper width direction. Non-uniformity in the tear strength of the paper at each location is promoted.

  For this reason, when the wet paper 12 is transferred from the paper making wire 43 to the water absorbing belt 47, the wet paper 12 may break or the like, and the wet paper 12 is not transferred well from the paper making wire 43 to the water absorbing belt 47. Is a state in which the leading edge of the wet paper 12 transferred to the water absorption belt 47 is torn off, does not have a linear shape in the paper width direction, and moves backward and protrudes backward in the paper conveyance direction. A jagged fracture shape in which the receding region is mixed.

As a result, as described above, the leading edge of the dry paper 61 is torn by the scraper 111 in the drying unit 14 and causes a paper jam.
For this reason, in the present embodiment, the following operation is performed at the initial stage of papermaking. That is, at the initial stage of operation when the pulp suspension 8 deinked from the head box 44 starts to be poured onto the papermaking wire 43, the papermaking initial control function unit 717 of the control unit 700 controls the operation of the papermaking unit 13, and the papermaking initial region. The paper thickness of the wet paper front end area is made with a papermaking initial set thickness that is larger than the paper book set thickness set in the wet paper book area following the wet paper front end area.

  That is, the paper suspension initial control function unit 717 controls the pulp suspension supply device 110 to make a pulp suspension to be supplied in accordance with the papermaking initial set thickness while making the papermaking initial region for a predetermined time from the papermaking start. The supply amount is controlled to an initial supply amount larger than the main supply amount of the pulp suspension supplied according to the papermaking book set thickness.

  Alternatively, the paper making initial control function unit 717 controls the paper making wire driving device 431 to change the moving speed of the paper making wire 43 driven according to the paper making initial set thickness while making the paper making initial region for a predetermined time from the paper making start. The paper making wire initial moving speed is controlled to be slower than the paper making wire main moving speed driven according to the set thickness of the paper making book.

  This paper-making wire main moving speed is determined by how many meters of recycled paper are discharged per unit time by the used paper recycling processor, that is, how many regular recycled papers are produced per unit time. In the present embodiment, the paper making wire 43 moves at a speed of, for example, about 0.1 m / min to 3.5 m / min. This moves by an order of magnitude slower than the moving speed of the paper making wire of a paper machine in a paper mill.

  Alternatively, the papermaking initial control function unit 717 controls the papermaking wire driving device 431 to stop the driving of the papermaking wire 43 for a predetermined time from the start of papermaking and to control the papermaking initial region to the papermaking initial set thickness.

Further, a plurality of the above examples are combined.
Then, the paper thickness of the wet paper web at the initial stage of papermaking is determined by making the paper thickness of the wet paper web at the papermaking initial thickness that is thicker than the papermaking book thickness set in the wet paper web area following the wet paper web area. To reduce the non-uniformity of the paper and to make the tear strength of the paper uniform in various places in the paper width direction. For example, the basis weight of 70 g / m ² (at the time of dry paper) is ensured as the paper thickness at the tip of the wet paper, and the minimum tensile strength that can withstand the transfer, for example, 600 mN (at the time of dry paper) is realized.

  As a result, the wet paper 12 smoothly transitions from the paper making wire 43 to the water absorbing belt 47 without breakage, and the wet paper 12 after the transfer has a linear shape with the leading edge aligned in the paper width direction. The tip edge of the dry paper 61 after being dried in step 1 can be uniformly peeled along the paper width direction by the scraper 111, and breakage of the leading edge of the dry paper causing a paper jam can be prevented.

  Here, when the dry paper 61 after drying is peeled off from the first transport belt 51 by the scraper 111, when the paper thickness of the wet paper web front end region of the wet paper 12 before drying is the same as the wet paper web region. The first conveying belt 51 and the dry paper 61 are in close contact with each other, so that a peeling error may occur. However, by increasing the thickness of the wet paper web front end region and increasing the paper thickness of the dry paper 61, the releasability of the dry paper 61 when the dry paper 61 is peeled off by the scraper 111 is improved. For example, the initial moving speed of the papermaking wire is set to 90% or less of the main moving speed of the papermaking wire, preferably 70% or less (including speed 0). According to this setting, when the paper thickness of the wet paper web area is 0.10 mm with respect to the paper thickness of the wet paper web area, the paper thickness of the wet paper web front area is 0.11 mm or more, preferably 0. 15 mm or more.

DESCRIPTION OF SYMBOLS 1 Paper feed part 2 Paper piece 3 Storage part 4 Waste paper 5 Paper feeder 6 Weighing part 7 Cyclone for discharge 8 Pulp suspension 9 Pulper part 10 Storage tank part 11 Deinking part 12 Wet paper 13 Paper making part 14 Drying part 15 Finishing part 16 Paper piece transport duct 17 Air flow 18 Air blower 37 Pulper tank 38 Stirrer 39 Stirrer 40 Deinking tank 42 Roller 43 Paper making wire 44 Head box 46 Roller 46a, 50a Roller 47 Water absorption belt 48 Heating device 49 Drying roller 50 Roller 51 First 1 Conveying belt 52 Roller 53 2nd Conveying belt 61 Dry paper 62 Recycled paper 63 Paper receiving part 60 Cutter 100 White water tank part 101 Waste water treatment tank part 102 Deinking drainage system 103 Sewage piping 104 Paper making drainage system 105, 106 White water return system 107 Water supply pipe 108 Water supply pipe 109 Original valve device 111 Scraper 112 Slitter Device 431 Papermaking Wire Drive Device 700 Control Unit 710 CPU
711 Pulper part control function part 712 Deinking part control function part 713 Paper making part control function part 714 Finishing control function part 715 Waste water treatment tank part control function part 716 Automatic operation control function part 717 Paper making initial control function part

Claims (4)

In a used paper recycling processing apparatus comprising a paper making unit forming one processing unit among a plurality of processing units constituting a used paper recycling processing system, and a control unit for controlling the operation of each processing unit,
The paper making part has a paper making wire part for making wet paper from the pulp suspension, and a head box part for supplying the pulp suspension to the paper making wire part,
The control unit controls the paper making unit to set the paper thickness of the wet paper leading edge area, which is the initial paper making area, to a paper paper initial setting thickness that is larger than the paper paper book setting thickness that is set in the wet paper paper book area that follows the wet paper web leading area. A used paper recycling apparatus having a papermaking initial control function unit for papermaking.   The headbox unit has a headbox for pouring pulp suspension onto the papermaking wire of the papermaking wire unit, and a pulp suspension supply device for supplying the pulp suspension to the headbox. The papermaking initial control function of the control unit During the papermaking initial region for a predetermined time from the start of papermaking, the part supplies the amount of pulp suspension supplied according to the papermaking initial set thickness to the pulp suspension supplied according to the papermaking set thickness. 2. The used paper recycling apparatus according to claim 1, wherein an initial supply amount is controlled to be larger than the main supply amount.   The papermaking wire section has a papermaking wire that receives the pulp suspension poured from the headbox section, and a papermaking wire drive device that drives the papermaking wire in the direction of paper transport. While making the paper making initial region for a predetermined time, the paper making wire moving speed driven according to the paper making initial set thickness is slower than the paper making wire moving speed driven according to the paper making set thickness. The used paper recycling apparatus according to claim 1, wherein the used paper recycling processing apparatus is controlled.   The papermaking wire section has a papermaking wire that receives the pulp suspension poured from the headbox section, and a papermaking wire drive device that drives the papermaking wire in the direction of paper transport. The used paper recycling apparatus according to claim 1 or 2, wherein the papermaking wire is stopped for a predetermined time to make the papermaking initial region at a papermaking initial set thickness.

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