WO2012081444A1

WO2012081444A1 - Waste paper recycling device

Info

Publication number: WO2012081444A1
Application number: PCT/JP2011/078116
Authority: WO
Inventors: 和田　晃; 優輔長田; 晋基谷本
Original assignee: デュプロ精工株式会社
Priority date: 2010-12-17
Filing date: 2011-12-06
Publication date: 2012-06-21
Also published as: CN103249890A; JP5656739B2; CN103249890B; JP2012140738A

Abstract

A papermaking unit (13) comprises: a papermaking wire mesh unit for forming a wet paper web (12) from pulp suspension (8); and a headbox unit for supplying the pulp suspension to the papermaking wire mesh unit. A control unit (700) comprises a papermaking initial-period control functional unit for controlling the papermaking unit (13) during a papermaking initial period. The papermaking initial-period control functional unit controls the thickness of a leading edge region of the wet paper web formed during the papermaking initial period to a papermaking initial-period set thickness, wherein the papermaking initial-period set thickness is set to be thicker than a papermaking normal-state set thickness, which is a thickness of a normal-state region of the wet paper web, the normal-state region of the wet paper web being formed following the leading edge region of the wet paper web.

Description

Waste paper recycling processor

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, is a technology related to paper thickness control at the initial stage of paper making.

Conventionally, in a used paper recycling system, a type of papermaking machine, pulp suspension containing recycled pulp regenerated from used paper is poured into the papermaking wire mesh in the papermaking section to make wet paper, and the wet paper is dehydrated from the papermaking wire mesh. The felt paper is transferred to the felt belt, the wet paper is dehydrated by the felt belt, and then the wet paper is dried by the drying unit, and then the dried dry paper is transferred to the finish.

As a prior art document relating to this type of papermaking technology, for example, Japanese Patent Publication No. 2008-524457 is available. 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 by suction or the like.

By the way, the wet paper web which is continuous in a belt shape is dried in the drying section to form dry paper, and then when the dry paper is transferred from the drying section to the finish, the tip of the paper is peeled off from the drying section by a scraper. .

However, if the wet paper does not transfer well from the papermaking wire mesh 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. Without a simple shape, it has a jagged fracture shape in which a protruding area protruding forward in the paper conveyance direction and a retracted area retracting backward are mixed.

For this reason, when peeling dry paper with a scraper from the drying section, a part of the leading edge of the peeled paper enters the front side of the scraper, and the other part enters the back side of the scraper. An event occurred in which the leading edge of the paper was torn with a scraper, and this event caused a paper jam.

The present invention solves the above-mentioned problems, and the wet paper web smoothly transitions from the papermaking wire mesh to the felt belt without breakage, and the dry paper has a leading edge aligned in the paper width direction. An object of the present invention is to provide a used paper recycling apparatus.

In order to solve the above-described problem, a used paper recycling processing apparatus according to the present invention includes a plurality of processing units constituting a used paper recycling processing system, and a used paper recycling processing apparatus including a control unit that controls operation of each processing unit. The paper making part that forms the processing part has a paper making wire mesh part that makes wet paper from the pulp suspension, and a head box part that supplies the pulp suspension to the paper making wire mesh part. The papermaking initial control function unit controls the paper thickness of the wet paper leading edge area formed at the initial stage of papermaking to the papermaking initial setting thickness, and the papermaking initial setting thickness is set to the wet paper leading edge region. The paper thickness is set to be thicker than the papermaking normal setting thickness which is the paper thickness of the wet paper normal region to be subsequently formed.

In the used paper recycling apparatus of the present invention, the head box unit has a head box for pouring the pulp suspension into the paper making wire mesh unit, and a pulp suspension supply device for supplying the pulp suspension to the head box. The paper making initial control function unit controls the amount of pulp suspension supplied to the initial supply amount according to the paper making initial set thickness during paper making of the wet paper tip area for a predetermined time from the start of paper making. The supply amount is a supply amount set to be larger than the normal supply amount of the pulp suspension to be supplied according to the papermaking normal setting thickness.

In the used paper recycling processing apparatus of the present invention, the papermaking wire mesh unit has a papermaking wire mesh that receives a pulp suspension poured from the head box unit, and a papermaking wire mesh driving device that drives the papermaking wire mesh in the paper transport direction, The papermaking initial control function part of the control unit controls the moving speed of the papermaking wire mesh adjusted according to the initial papermaking thickness to the initial moving speed during papermaking of the wet paper tip area for a predetermined time from the start of papermaking. The moving speed is a moving speed set slower than the normal moving speed of the papermaking wire mesh adjusted according to the papermaking normal set thickness.

In the used paper recycling processing apparatus of the present invention, the papermaking wire mesh unit has a papermaking wire mesh that receives a pulp suspension poured from the head box unit, and a papermaking wire mesh driving device that drives the papermaking wire mesh in the paper transport direction, The paper making initial control function part of the control unit is characterized in that the paper making wire mesh is stopped driving for a predetermined time from the paper making start, and the wet paper web leading end region is made to the paper making initial setting thickness.

As described above, according to the present invention, the paper thickness of the wet paper web front end region is set to a papermaking initial set thickness that is thicker than the paper normal paper set thickness that is the paper thickness of the wet paper web normal region formed following the wet paper web front end region. 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 smoothly transitions from the paper making wire mesh to the felt belt without breaking, and the wet paper has a linear shape with the leading edge aligned in the paper width direction. The leading edge of the paper can be uniformly peeled along the paper width direction with a scraper, and the leading edge of the dry paper that causes paper jam can be prevented from breaking.

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

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

The head box unit is a head box 44 for pouring the deinked pulp suspension 8 onto the papermaking wire mesh 43, and a pulp suspension such as a pump for supplying the pulp suspension 8 to the head box 44 from the deinking tank 40. A liquid 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. The wet paper 12 is transferred from the papermaking wire mesh 43 to the water absorbing belt 47, and 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

rollers

46 a and 50 a for pressing 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 conveyor belt 51 by the scraper 111 at the forward end position of the first conveyor 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. The dry paper 61 is a predetermined size. A metal cutter device 60 and a slitter device 112 are provided.

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 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 shown in FIG. 2, the control unit 700 has 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 to control the paper thickness of the wet paper leading end region formed at the initial stage of paper making to be thicker than the paper thickness of the wet paper normal region formed following the wet paper leading end region. Is what you do. That is, the papermaking initial thickness, which is the paper thickness of the wet paper tip area, is set to a paper thickness that is thicker than the papermaking normal thickness, which is the paper thickness of the wet paper normal area, and the paper thickness of the wet paper tip area is set to the papermaking initial setting thickness. Control paper making.

As an example of this control, the initial supply amount, which is the supply amount of the pulp suspension supplied according to the papermaking initial set thickness, is larger than the normal supply amount of the pulp suspension supplied according to the papermaking normal setting thickness. Some papermaking is performed with the supply amount set, and the pulp suspension supply device 110 is controlled to control the pulp suspension supply amount while the wet paper web front end region is being made for a predetermined time from the start of papermaking. To control.

As another example of control, the initial moving speed, which is the moving speed of the papermaking wire mesh 43 driven according to the initial papermaking thickness, is set as the moving speed of the papermaking wire mesh 43, driven according to the normal setting thickness of papermaking. Some papers are made by setting a moving speed slower than a certain normal moving speed, and during the papermaking of the wet paper web leading end region for a predetermined time from the papermaking start, the papermaking wire mesh driving device 431 is controlled to control the papermaking wire mesh 43. The moving speed is controlled to the initial moving speed.

As another example of control, the paper making wire mesh driving device 431 is controlled to stop the driving of the paper making wire mesh 43 for a predetermined time from the start of paper making to make the wet paper web tip area at the paper making initial thickness. There is something to do.

Furthermore, there are things that are performed by combining a plurality of the above examples.

Hereinafter, the operation of the above configuration will be described.

In the operation of performing the used paper recycling process, the automatic operation control function 716 of the control unit 700 includes a recycled pulp unit control function unit 711, a deinking unit control function unit 712, a papermaking unit control function unit 713, a finishing unit control function unit 714, and a wastewater treatment. The 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 waste water treatment tank unit 101 are controlled to operate the used paper recycling processing system in each processing unit described above. .

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 mesh 43 to the water absorbing belt 47 is due to the water absorption of the water absorbing belt 47. On the contrary, the thicker the wet paper 12 is, the more easily the adsorbing force is applied, and the higher the water absorption of the water absorbing belt 47 is, the stronger the wet paper 12 is adsorbed to increase the certainty of transfer. .

The water absorbency of the water absorption belt 47 is related to the drainage of the water absorption belt, and the better the drainage, the better the water absorption. 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 flow of the pulp suspension 8 flowing out on the paper making wire mesh 43 at the initial stage of paper making is not uniform in the paper width direction, and the pulp suspension 8 spreads unevenly in the paper conveying direction of the paper making wire mesh 43, thereby The paper thickness of the paper 12 becomes non-uniform in the paper width direction, and non-uniformity in the tear strength of the paper at various locations in the paper width direction is promoted.

For this reason, when the wet paper 12 is transferred from the paper making wire mesh 43 to the water absorbing belt 47, the wet paper 12 may be broken or the like, and the wet paper 12 does not transfer well from the paper making wire mesh 43 to the water absorbing belt 47. In this case, the leading edge of the wet paper 12 transferred to the water absorption belt 47 is torn off, and does not have a linear shape in the paper width direction, and protrudes forward and in the paper conveyance direction. A jagged fracture shape in which a retreating region to retreat 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.

Therefore, in this 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 is started to be poured onto the papermaking wire mesh 43, the papermaking initial control function unit 717 of the control unit 700 controls the operation of the papermaking unit 13, and wet paper Paper is made at a papermaking initial set thickness that is thicker than the papermaking normal thickness set in the wet paper normal area following the wet paper frontal area.

That is, the pulp suspension supplied by the papermaking initial control function unit 717 according to the papermaking initial set thickness while the papermaking initial control function unit 717 controls the pulp suspension supply device 110 during the papermaking of the wet paper web tip region for a predetermined time from the papermaking start. Is controlled to an initial supply amount larger than the normal supply amount of the pulp suspension supplied according to the papermaking normal setting thickness.

Alternatively, the papermaking initial control function unit 717 controls the papermaking wire mesh driving device 431 during papermaking of the wet paper web leading end region for a predetermined time from the papermaking start, and the papermaking wire mesh 43 driven according to the papermaking initial set thickness is used. The moving speed is controlled to an initial moving speed that is slower than the normal moving speed of the papermaking wire mesh 43 that is driven according to the papermaking normal set thickness.

The normal moving speed of the paper making wire mesh 43 is determined by how many meters of recycled paper the recycled paper recycling apparatus discharges per unit time, that is, how many standard recycled papers are produced per unit time. In the present embodiment, for example, the papermaking wire mesh 43 is moving at a speed of about 0.1 m / min to 3.5 m / min. This is an order of magnitude slower than the moving speed of the paper making wire mesh of a paper machine in a paper mill.

Alternatively, the papermaking initial control function unit 717 controls the papermaking wire mesh driving device 431 to stop the driving of the papermaking wire mesh 43 for a predetermined time from the start of papermaking to control the wet paper web tip area to the papermaking initial set thickness. Do.

Furthermore, it is performed by combining a plurality of the above examples.

Then, by forming the paper thickness of the wet paper web at the leading edge region to be thicker than the paper thickness of the wet paper paper normal region, the paper thickness in the paper width direction can be alleviated by reducing the uneven thickness of the wet paper at the initial stage of papermaking. To equalize the tear resistance. For example, the basis weight of 70 g / m ² (at the time of dry paper) is ensured as the paper thickness of the wet paper web front end region, 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 mesh 43 to the water absorption 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. 14, the leading edge of the dry paper 61 after being dried at 14 can be uniformly peeled along the paper width direction by the scraper 111, and breakage of the leading edge of the dry paper that causes paper jam can be prevented.

Here, when the dry paper 61 after drying is peeled from the first transport belt 51 by the scraper 111, the paper thickness of the wet paper web front end region of the wet paper 12 before drying is the same as the normal 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 mesh is set to 90% or less of the normal moving speed of the papermaking wire mesh, preferably 70% or less (including speed 0). According to this setting, when the paper thickness of the wet paper web normal region is 0.10 mm with respect to the paper thickness of the wet paper web normal region, the paper thickness of the wet paper web top region is 0.11 mm or more, preferably 0. 15 mm or more.

Claims

In a used paper recycling processing apparatus comprising 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 forming one processing part has a paper making wire mesh part for making wet paper from the pulp suspension, and a head box part for supplying the pulp suspension to the paper making wire mesh part,
The control unit has a papermaking initial control function part that controls the papermaking part at the initial stage of papermaking, and the papermaking initial control function part controls the paper thickness of the wet paper tip area formed at the initial stage of papermaking to the papermaking initial setting thickness, and the papermaking initial setting A used paper recycling apparatus characterized in that the thickness is a paper thickness set thicker than a papermaking normal set thickness which is a paper thickness of a wet paper normal region formed following the wet paper leading end region.
The head box unit has a head box for pouring the pulp suspension into the paper making wire mesh unit, and a pulp suspension supply device for supplying the pulp suspension to the head box, and the paper making initial control function unit of the control unit is During the papermaking process at the tip of the wet paper for a predetermined time from the start of papermaking, the pulp suspension supply amount is controlled to the initial supply amount according to the initial papermaking thickness, and the initial supply amount depends on the papermaking normal setting thickness. The used paper recycling apparatus according to claim 1, wherein the supply amount is set to be larger than the normal supply amount of the pulp suspension supplied.
The papermaking wire mesh unit has a papermaking wire mesh that receives the pulp suspension poured from the headbox unit, and a papermaking wire mesh drive device that drives the papermaking wire mesh in the paper transport direction. During the papermaking of the wet paper tip area for a predetermined time from the start of papermaking, the moving speed of the papermaking wire mesh adjusted according to the papermaking initial set thickness is controlled to the initial moving speed, and the initial moving speed is set according to the papermaking normal set thickness 3. The used paper recycling apparatus according to claim 1, wherein the used paper recycling speed is set to be slower than the normal speed of the papermaking wire mesh to be adjusted.
The papermaking wire mesh unit has a papermaking wire mesh that receives the pulp suspension poured from the headbox unit, and a papermaking wire mesh drive device that drives the papermaking wire mesh in the paper transport direction. 3. The used paper recycling apparatus according to claim 1, wherein the papermaking wire mesh is stopped for a predetermined time from the start of papermaking, and the wet paper web front end region is made to a papermaking initial set thickness.