CN113584918A - Production process of waste paper reconstituted corrugated medium paper with improved bending strength - Google Patents
Production process of waste paper reconstituted corrugated medium paper with improved bending strength Download PDFInfo
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- CN113584918A CN113584918A CN202110785848.XA CN202110785848A CN113584918A CN 113584918 A CN113584918 A CN 113584918A CN 202110785848 A CN202110785848 A CN 202110785848A CN 113584918 A CN113584918 A CN 113584918A
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- 238000005452 bending Methods 0.000 title claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 9
- 239000010893 paper waste Substances 0.000 title claims abstract description 9
- 238000004537 pulping Methods 0.000 claims abstract description 54
- 239000002699 waste material Substances 0.000 claims abstract description 43
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 24
- 238000003825 pressing Methods 0.000 claims description 37
- 238000005086 pumping Methods 0.000 claims description 30
- 238000005406 washing Methods 0.000 claims description 30
- 238000003756 stirring Methods 0.000 claims description 16
- 238000001035 drying Methods 0.000 claims description 15
- 239000012535 impurity Substances 0.000 claims description 13
- 230000007246 mechanism Effects 0.000 claims description 13
- 239000002761 deinking Substances 0.000 claims description 12
- 238000005188 flotation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000004061 bleaching Methods 0.000 claims description 6
- 239000004744 fabric Substances 0.000 claims description 6
- 238000002791 soaking Methods 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 3
- 238000002347 injection Methods 0.000 claims description 3
- 239000007924 injection Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 3
- 238000004513 sizing Methods 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 239000000835 fiber Substances 0.000 abstract description 14
- 239000000123 paper Substances 0.000 description 111
- 238000011084 recovery Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000654 additive Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
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Classifications
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/32—Defibrating by other means of waste paper
- D21B1/325—Defibrating by other means of waste paper de-inking devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/10—Bleaching ; Apparatus therefor
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D5/00—Purification of the pulp suspension by mechanical means; Apparatus therefor
- D21D5/02—Straining or screening the pulp
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
- D21F3/02—Wet presses
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/64—Paper recycling
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
The invention discloses a production process of waste paper reconstruction corrugated core paper for improving bending strength, which adds a board crushing step before the pulping step, physically crushes and splits a paper stack into a plurality of crushed boards in a multidirectional tearing mode, has simple process, reduces the comprehensive breaking rate of long fibers in waste corrugated paper boxes/boards by less than 15 percent in the pulping and pulp grinding processes, greatly reduces the breaking rate of the fibers, and ensures that the recycled fibers have high quality, thereby ensuring the structural strength and toughness of the finally produced corrugated paper core paper or corrugated paper.
Description
Technical Field
The invention relates to the technical field of waste corrugated case/board papermaking processes, in particular to a production process of waste paper reconstituted corrugated medium paper for improving bending strength.
Background
The pulping production line in the process of using the waste corrugated case/board to reconstruct the corrugated core paper comprises various devices, including pulping devices, various impurity removing devices, multiple lossless pulping machines and various auxiliary devices for adding additives or auxiliary materials, at present, in the pulping process, the waste paper is directly and integrally put into a pulping barrel, after being soaked for a period of time, a pulping stirrer is started to stir and pulp, the general pulping time needs 4-10 hours, the pulping time is very long, the breaking rate of fibers in pulp in the pulping process is very high, the internal and external damages of the fibers are very serious, the quality of the recycled fibers is poor, and the structural strength and the toughness of the finally produced corrugated core paper or corrugated paper are poor, so that the improvement is necessary.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the production process of the waste paper reconstruction corrugated core paper for improving the bending strength, the quality of the recycled fiber is high, and the structural strength and the toughness of the finally produced corrugated core paper or corrugated paper are improved.
In order to achieve the purpose, the invention adopts the technical scheme that: a production process of waste paper reconstructed corrugated medium paper for improving bending strength, which comprises the following steps,
a plate crushing step, namely performing plate crushing treatment by using plate crushing equipment, and circularly executing the following substeps,
a feeding substep, wherein a roller type conveying mechanism consisting of a plurality of feeding rollers arranged at intervals is used for feeding the whole waste corrugated case/board to a case tearing platform stopped at a first station, the waste corrugated case/board is continuously conveyed to the case tearing platform and is stacked on the case tearing platform into a paper pile, the waste corrugated case/board comprises the whole waste corrugated case or the whole waste corrugated board obtained by disassembling the waste corrugated case,
a material pressing substep, wherein the carton tearing platform is arranged at the top of a telescopic column of a self-pressing pneumatic cylinder, the pneumatic cylinder is provided with a piston sheet, an upper air pressure chamber which is arranged above the piston sheet in a sealing way and a lower air pressure chamber which is arranged below the piston sheet in a sealing way, an upper air inlet which is communicated with the upper air pressure chamber in a sealing way and a lower air inlet which is communicated with the lower air pressure chamber in a sealing way, the air pressure of the lower air pressure chamber is larger than that of the upper air pressure chamber, the telescopic column is in an extending state in an initial state, the carton tearing platform is stopped at a first station through the support of the telescopic column, the material feeding substep is stopped after a paper stack reaches a set height, the paper stack is respectively pushed downwards through a plurality of hydraulic push rods which are arranged at intervals above the carton tearing platform, the carton tearing platform is moved downwards from the first station to a second station, and upward flexible recoil pressure is provided through the air pressure in the lower air pressure chamber, and the paper pile is compressed downwards by a hydraulic push rod to be tightly pressed above the paper box tearing platform,
a plurality of hydraulic tearing devices are arranged at intervals along the circumferential direction at the outer edge of the carton tearing platform at the second station, each hydraulic tearing device comprises a hydraulic cylinder and a hydraulic paper tearing clamp arranged at the outer end part of a pull rod of the hydraulic cylinder, the pull rods of the hydraulic tearing devices respectively move in different radial directions in a telescopic way, the pull rods respectively drive the corresponding hydraulic paper tearing clamps to move towards the central part of the carton tearing platform, and then the hydraulic paper tearing clamps are controlled to respectively clamp the periphery of a paper stack,
a tearing sub-step, firstly controlling the hydraulic push rod to move upwards for resetting, enabling the paper box tearing platform to upwards support against the paper pile under the pressure action of the lower air pressure chamber, then driving each corresponding hydraulic paper tearing clamp to respectively move towards the outside along different and radial directions through the pull rod, breaking and tearing the paper pile into a plurality of broken plates in a multidirectional tearing mode, tearing the waste corrugated paper box/plate into broken plates with smaller area in a physical tearing mode, then controlling the hydraulic paper tearing clamps to reset and release the broken plates, finally controlling the hydraulic paper tearing clamps to retreat for resetting, enabling the broken plates to fall downwards,
a material pushing sub-step, pushing the broken board remained on the paper box tearing platform towards one side through a material pushing plate arranged at one side of the paper box tearing platform at the first station to enable the broken board to fall downwards,
a feeding substep, in which the crushed boards generated in the tearing substep and the pushing substep drop downwards to a conveyer belt arranged below the paper box tearing platform, and the crushed boards are conveyed to the upper part of the crushed pulp barrel through the conveyer belt, so that the crushed boards drop downwards freely from the tail end of the conveyer belt and fall into the crushed pulp barrel;
a pulping step, injecting clear water into a pulping barrel, stirring at low speed by a stirrer arranged in the pulping barrel after stopping water injection, controlling the rotating speed of the stirrer at 200 revolutions per minute in the low-speed stirring process, controlling the time of the low-speed stirring at 0.5-1 hour, completely soaking the crushed boards by low-speed stirring and soaking to enable the water content of the crushed boards to reach more than 60%, then controlling the stirrer to stir at high speed for pulping treatment, controlling the rotating speed of the stirrer at 1000 revolutions per minute in the pulping treatment process to 2000 revolutions per minute, and discharging pulp through a pulp discharge port arranged at the lower part of the pulping barrel in the middle after finishing the pulping treatment to obtain paper-making primary pulp;
a hydraulic impurity removal step, namely pumping the paper-making raw pulp to a hydraulic impurity removal workshop for hydraulic impurity removal treatment;
a washing step, namely pumping the papermaking raw pulp subjected to the hydraulic impurity removal treatment to a pulp washing tank for washing treatment;
a deslagging step, namely pumping the washed paper-making raw pulp to a deslagging workshop, performing high-concentration deslagging treatment on the washed paper-making raw pulp through high-concentration deslagging equipment in the deslagging workshop, and performing low-concentration deslagging treatment on the washed paper-making raw pulp through low-concentration deslagging equipment;
a bleaching step, namely pumping the papermaking raw pulp subjected to the deslagging step to a first high-speed pulp washing unit, and bleaching the pulp by the first high-speed pulp washing unit;
a filter pressing step, namely pumping the bleached paper-making raw pulp into a filter pressing workshop, performing high-concentration filter pressing treatment on the paper-making raw pulp through high-concentration filter pressing equipment in the filter pressing workshop, and performing low-concentration filter pressing treatment on the paper-making raw pulp through low-concentration filter pressing equipment in the filter pressing workshop;
a flotation deinking step, namely pumping the paper making raw pulp subjected to the filter pressing step to a flotation deinking workshop, and performing flotation deinking treatment through a flotation deinking pool to obtain paper making raw pulp;
a pulping step, namely pumping the papermaking coarse pulp to a pulping workshop, carrying out pulping treatment through a coarse pulping machine, and carrying out fine pulping treatment through a fine pulping machine to obtain primary pulp;
a pulp washing step, namely pumping the primary pulp to a second high-speed pulp washing machine set, and carrying out pulp washing treatment through the second high-speed pulp washing machine set;
a pulp mixing step, namely pumping the primary pulp subjected to pulp washing treatment to a pulp mixing workshop for pulp mixing treatment to obtain papermaking pulp;
a papermaking forming step, namely pumping papermaking slurry to a papermaking forming workshop, continuously spraying the papermaking slurry to the mesh cloth through a spray gun, forming a layered slurry layer on the mesh cloth, and continuously outputting the layered slurry layer;
a squeezing and dewatering treatment step, wherein the layered pulp layer is continuously transferred to a squeezing unit through a first vacuum suction and moving roller, the layered pulp layer is continuously conveyed forwards, and the layered pulp layer is sequentially squeezed through a plurality of squeezing and dewatering rollers of the squeezing unit to dewater the layered pulp layer to obtain a wet paper layer;
a drying treatment step, transferring the wet paper layer to a drying unit through a second vacuum suction shifting roller, continuously conveying the wet paper layer forwards, and drying the wet paper layer to obtain dry paper through a plurality of drying rollers of the drying unit in sequence;
and a post-treatment step, namely performing rewinding treatment, press polishing treatment, surface sizing treatment, slitting treatment and packaging treatment on the dry paper in sequence to obtain the finished corrugated medium paper.
Further, in the feeding substep, the top surface of the carton tearing platform at the initial position is lower than the top surface of the roller type conveying mechanism, a receiving space is formed above the carton tearing platform, the waste corrugated cartons/boards conveyed to the carton tearing platform by the roller type conveying mechanism automatically drop to the receiving space, the height between the top surface of the carton tearing platform and the top surface of the roller type conveying mechanism is enough to accommodate a paper stack formed by stacking 30-50 waste corrugated cartons/boards up and down, and the pressing substep is performed after the height of the paper stack conveyed to the receiving space reaches 20-30 cm.
Furthermore, a pushing sub-step is arranged between the feeding sub-step and the pressing sub-step,
a pushing sub-step, wherein push plates with the width of 2-5cm and the height of 30-40cm are respectively arranged at the periphery of the carton tearing platform at a first station at intervals, the bottom surface of each push plate is 0.2-0.5m higher than the top surface of the carton tearing platform at the first station, the waste corrugated cartons/plates falling on the carton tearing platform are pushed towards the central part of the carton tearing platform by the push plates, so that the waste corrugated cartons/plates falling above the carton tearing platform are gathered towards the central part of the carton tearing platform and are overlapped up and down, the push plates are controlled to retreat and reset after the paper stack is compressed downwards by a hydraulic push rod,
in the horizontal projection plane, the width of the paper box tearing platform is smaller than that of the paper pile, the length of the paper box tearing platform is smaller than that of the paper pile, so that any side edge of the paper pile relatively protrudes out of the same side edge of the paper box tearing platform by 10-15cm, the part of the paper pile protruding out of the side edge of the paper box tearing platform is used as a clamping part of the hydraulic paper tearing pliers,
in the tearing substep, the respective hydraulic paper tearing pliers are caused to clamp the clamping portions.
Furthermore, the gap between two adjacent hydraulic paper tearing pliers is provided with the push plate.
Furthermore, the hydraulic paper tearing pliers comprise an upper pliers body and a lower pliers body, a plurality of sharp teeth are formed on the inner side faces of the pliers bodies, and the paper stack is gripped through the sharp teeth of the pliers bodies in the tearing sub-step.
Compared with the prior art, the invention has the advantages that: the paper pile breaking and splitting process is simple, the paper pile is physically broken and split into the plurality of the chopping boards in a multidirectional tearing mode, the subsequent pulping time is reduced, the fiber recovery rate is improved, a large amount of fibers are prevented from being damaged in the pulping process, and the equipment used for implementing the process is simple, low in operation cost, more energy-saving and more environment-friendly.
The comprehensive recovery rate of the fibers in the waste corrugated case/board is more than 95%, the recovery rate of the long fibers is improved, the comprehensive breakage rate of the long fibers in the waste corrugated case/board in the pulping and pulping processes is less than 15%, the fiber breakage rate is greatly reduced, the quality of the recovered fibers is high, and the structural strength and the toughness of the finally produced corrugated core paper or corrugated paper are improved.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic process flow diagram of the present invention.
Fig. 2 is a schematic view of the structure of the plate crushing apparatus used in the plate crushing step.
Fig. 3 is a schematic diagram of a structure for performing physical tearing and breaking in a plate breaking step by using a hydraulic paper-tearing pliers.
The labels in the figure are:
the 1 roller type conveying mechanism 2 carton tearing platform 21 is hydraulically pushed by a self-pressing type pneumatic cylinder 22.
3 pile of paper.
4 hydraulic tearing device 41 hydraulic paper tearing pliers.
And 5, conveying the belt.
Detailed Description
The following are merely preferred embodiments of the present invention, and do not limit the scope of the present invention.
A production process of waste paper reconstructed corrugated medium paper with improved bending strength, which is shown in figure 1 and comprises the following steps,
a plate crushing step of performing a plate crushing process using a plate crushing apparatus, as shown in fig. 2 and 3, the following sub-steps are cyclically performed,
a feeding substep, wherein a roller type conveying mechanism 1 consisting of a plurality of feeding rollers arranged at intervals is used for feeding the whole waste corrugated case/board to a case tearing platform 2 stopped at a first station, the waste corrugated case/board is continuously conveyed to the case tearing platform 2 and is stacked on the case tearing platform 2 to form a paper pile 3, the waste corrugated case/board comprises the whole waste corrugated case or the whole waste corrugated board obtained by disassembling the waste corrugated case,
enabling the top surface of the paper box tearing platform 2 at the initial position to be lower than the top surface of the roller type conveying mechanism 1, forming a containing space above the paper box tearing platform 2, enabling the waste corrugated paper boxes/plates conveyed to the paper box tearing platform 2 through the roller type conveying mechanism 1 to automatically fall into the containing space, enabling the height between the top surface of the paper box tearing platform 2 and the top surface of the roller type conveying mechanism 1 to be enough to contain a paper stack 3 formed by stacking 30-50 waste corrugated paper boxes/plates up and down, and performing a clamping sub-step after the height of the paper stack 3 conveyed into the containing space reaches 20-30 cm;
a pushing sub-step, in which push plates with the width of 2-5cm and the height of 30-40cm are respectively arranged at the periphery of the carton tearing platform 2 at a first station at intervals, a push plate is arranged in a gap between two adjacent hydraulic paper tearing pliers 41, the bottom surface of the push plate is 0.2-0.5m higher than the top surface of the carton tearing platform 2 at the first station, the waste corrugated cartons/plates falling on the carton tearing platform 2 are pushed towards the central part of the carton tearing platform 2 by the push plate, so that the waste corrugated cartons/plates falling on the carton tearing platform 2 are gathered towards the central part of the carton tearing platform 2 and are overlapped up and down, the push plate 22 is controlled to retreat and reset after the paper stack 3 is compressed downwards,
in the horizontal projection plane, the width of the paper box tearing platform 2 is smaller than that of the paper pile 3, the length of the paper box tearing platform 2 is smaller than that of the paper pile 3, so that any side edge of the paper pile 3 protrudes 10-15cm relatively on the same side edge of the paper box tearing platform 2, and the part of the paper pile 3 protruding out of the side edge of the paper box tearing platform 2 is used as a clamping part of a hydraulic paper tearing clamp 41;
a material pressing substep, wherein the carton tearing platform 2 is arranged at the top of a telescopic column of a self-pressing pneumatic cylinder 21, the pneumatic cylinder is provided with a piston sheet, an upper air pressure chamber which is arranged above the piston sheet in a sealing way and a lower air pressure chamber which is arranged below the piston sheet in a sealing way, an upper air inlet which is communicated with the upper air pressure chamber in a sealing way and a lower air inlet which is communicated with the lower air pressure chamber in a sealing way, the air pressure of the lower air pressure chamber is larger than that of the upper air pressure chamber, the telescopic column is in an extending state in an initial state, the carton tearing platform 2 is stopped at a first station through the support of the telescopic column, the feeding substep is stopped after the paper stack 3 reaches a set height, the paper stack 3 is respectively pushed downwards through a plurality of hydraulic push rods 22 which are arranged at intervals above the carton tearing platform 2, the carton tearing platform 2 is enabled to move downwards from the first station to a second station, and upward flexible recoil pressure is provided through the air pressure in the lower air pressure chamber, and the paper pile 3 is compressed downwards by the hydraulic push rod 22, the paper pile 3 is pressed above the paper box tearing platform 2,
a paper clamping substep, in which a plurality of hydraulic tearing devices 4 are arranged at intervals along the circumferential direction at the outer edge of the carton tearing platform 2 at the second station, each hydraulic tearing device 4 comprises a hydraulic cylinder and a hydraulic paper tearing clamp 41 arranged at the outer end part of a pull rod of the hydraulic cylinder, the pull rods of the hydraulic tearing devices 4 respectively move in different radial directions in a telescopic manner, the corresponding hydraulic paper tearing clamps 41 are respectively driven by the pull rods to move towards the central part of the carton tearing platform 2, and then the hydraulic paper tearing clamps 41 are controlled to respectively clamp the periphery of the paper stack 3, so that the hydraulic paper tearing clamps 41 respectively clamp the clamping parts;
and a tearing sub-step, in which the hydraulic paper tearing pliers 41 comprise an upper pliers and a lower pliers, the inner side surfaces of the pliers are formed with a plurality of sharp teeth, and the paper stack 3 is gripped by the sharp teeth of the pliers in the tearing sub-step. Firstly, the hydraulic push rod 22 is controlled to move upwards for resetting, the paper box tearing platform 2 upwards supports against the paper stack 3 under the pressure action of the lower air pressure chamber, upward acting force is provided by the paper box tearing platform 2 to tear the waste corrugated paper boards more dispersedly, then the pull rod drives each corresponding hydraulic paper tearing clamp 41 to respectively move outwards along different and radial directions, the paper stack 3 is respectively torn along a plurality of different directions in the circumferential direction, the paper stack 3 is physically torn into a plurality of broken plates in a multidirectional tearing mode, the waste corrugated paper boxes/plates are torn into broken plates with smaller areas in a physical tearing mode, then the hydraulic paper tearing clamps 41 are controlled to reset and release the broken plates, and finally the hydraulic paper tearing clamps 41 are controlled to retreat for resetting to enable the broken plates to fall downwards,
a material pushing sub-step, in which the material pushing plate arranged at one side of the carton tearing platform 2 at the first station pushes the broken plates remained on the carton tearing platform 2 towards one side to make the broken plates fall down,
a feeding substep, in which the crushed boards generated in the tearing substep and the pushing substep drop downwards to a conveyer belt 5 arranged below the carton tearing platform 2, and the crushed boards are conveyed to the upper part of the crushed pulp barrel through the conveyer belt 5, so that the crushed boards drop downwards freely from the tail end of the conveyer belt 5 and fall into the crushed pulp barrel;
a pulping step, injecting clear water into a pulping barrel, stirring at low speed by a stirrer arranged in the pulping barrel after stopping water injection, controlling the rotating speed of the stirrer at 200 revolutions per minute in the low-speed stirring process, controlling the time of the low-speed stirring at 0.5-1 hour, completely soaking the crushed boards by low-speed stirring and soaking to enable the water content of the crushed boards to reach more than 60%, then controlling the stirrer to stir at high speed for pulping treatment, controlling the rotating speed of the stirrer at 1000 revolutions per minute in the pulping treatment process to 2000 revolutions per minute, and discharging pulp through a pulp discharge port arranged at the lower part of the pulping barrel in the middle after finishing the pulping treatment to obtain paper-making primary pulp;
a hydraulic impurity removal step, namely pumping the paper-making raw pulp to a hydraulic impurity removal workshop for hydraulic impurity removal treatment;
a washing step, namely pumping the papermaking raw pulp subjected to the hydraulic impurity removal treatment to a pulp washing tank for washing treatment;
a deslagging step, namely pumping the washed paper-making raw pulp to a deslagging workshop, performing high-concentration deslagging treatment on the washed paper-making raw pulp through high-concentration deslagging equipment in the deslagging workshop, and performing low-concentration deslagging treatment on the washed paper-making raw pulp through low-concentration deslagging equipment;
a bleaching step, namely pumping the papermaking raw pulp subjected to the deslagging step to a first high-speed pulp washing unit, and bleaching the pulp by the first high-speed pulp washing unit;
a filter pressing step, namely pumping the bleached paper-making raw pulp into a filter pressing workshop, performing high-concentration filter pressing treatment on the paper-making raw pulp through high-concentration filter pressing equipment in the filter pressing workshop, and performing low-concentration filter pressing treatment on the paper-making raw pulp through low-concentration filter pressing equipment in the filter pressing workshop;
a flotation deinking step, namely pumping the paper making raw pulp subjected to the filter pressing step to a flotation deinking workshop, and performing flotation deinking treatment through a flotation deinking pool to obtain paper making raw pulp;
a pulping step, namely pumping the papermaking coarse pulp to a pulping workshop, carrying out pulping treatment through a coarse pulping machine, and carrying out fine pulping treatment through a fine pulping machine to obtain primary pulp;
a pulp washing step, namely pumping the primary pulp to a second high-speed pulp washing machine set, and carrying out pulp washing treatment through the second high-speed pulp washing machine set;
a pulp mixing step, namely pumping the primary pulp subjected to pulp washing treatment to a pulp mixing workshop for pulp mixing treatment to obtain papermaking pulp;
a papermaking forming step, namely pumping papermaking slurry to a papermaking forming workshop, continuously spraying the papermaking slurry to the mesh cloth through a spray gun, forming a layered slurry layer on the mesh cloth, and continuously outputting the layered slurry layer;
a squeezing and dewatering treatment step, wherein the layered pulp layer is continuously transferred to a squeezing unit through a first vacuum suction and moving roller, the layered pulp layer is continuously conveyed forwards, and the layered pulp layer is sequentially squeezed through a plurality of squeezing and dewatering rollers of the squeezing unit to dewater the layered pulp layer to obtain a wet paper layer;
a drying treatment step, transferring the wet paper layer to a drying unit through a second vacuum suction shifting roller, continuously conveying the wet paper layer forwards, and drying the wet paper layer to obtain dry paper through a plurality of drying rollers of the drying unit in sequence;
and a post-treatment step, namely performing rewinding treatment, press polishing treatment, surface sizing treatment, slitting treatment and packaging treatment on the dry paper in sequence to obtain the finished corrugated medium paper.
Claims (5)
1. The production process of the waste paper reconstituted corrugated medium paper for improving the bending strength is characterized by comprising the following steps of: comprises the following steps of (a) carrying out,
a plate crushing step, namely performing plate crushing treatment by using plate crushing equipment, and circularly executing the following substeps,
a feeding substep, wherein a roller type conveying mechanism (1) consisting of a plurality of feeding rollers arranged at intervals is used for feeding the whole waste corrugated case/board to a case tearing platform (2) stopped at a first station, the waste corrugated case/board is continuously conveyed to the case tearing platform (2) and is stacked on the case tearing platform (2) to form a paper stack (3), and the waste corrugated case/board comprises the whole waste corrugated case or the whole waste corrugated board obtained by disassembling the waste corrugated case,
a material pressing substep, wherein the carton tearing platform (2) is arranged at the top of a telescopic column of a self-pressing pneumatic cylinder (21), the pneumatic cylinder is provided with a piston sheet, an upper air pressure chamber which is arranged above the piston sheet in a sealing way and a lower air pressure chamber which is arranged below the piston sheet in a sealing way, an upper air inlet which is communicated with the upper air pressure chamber in a sealing way, a lower air inlet which is communicated with the lower air pressure chamber in a sealing way, the air pressure of the lower air pressure chamber is larger than that of the upper air pressure chamber, the telescopic column is in an extending state in an initial state, the carton tearing platform (2) is stopped at a first station through the support of the telescopic column, the material feeding substep is stopped after the paper stack (3) reaches a set height, the paper stack (3) is respectively pushed downwards by a plurality of hydraulic push rods (22) which are arranged above the carton tearing platform (2) at intervals, and the carton tearing platform (2) is moved downwards from the first station to a second station, an upward flexible recoil pressure is provided by the air pressure in the lower air pressure chamber, the paper stack (3) is compressed downwards by the hydraulic push rod (22) to press the paper stack (3) above the paper box tearing platform (2),
a plurality of hydraulic tearing devices (4) are arranged at intervals along the circumferential direction at the outer edge of the carton tearing platform (2) at the second station, each hydraulic tearing device (4) comprises a hydraulic cylinder and a hydraulic paper tearing clamp (41) arranged at the outer end part of a pull rod of the hydraulic cylinder, the pull rods of the hydraulic tearing devices (4) respectively move in different radial directions in a telescopic way, the corresponding hydraulic paper tearing clamps (41) are respectively driven to move towards the central part of the carton tearing platform (2) through the pull rods, and then the hydraulic paper tearing clamps (41) are controlled to respectively clamp the periphery of the paper stack (3),
a tearing sub-step, firstly controlling a hydraulic push rod (22) to move upwards for resetting, enabling a paper box tearing platform (2) to upwards support against a paper pile (3) under the pressure action of a lower air pressure chamber, then driving each corresponding hydraulic paper tearing clamp (41) to move outwards along different and radial directions through a pull rod, physically breaking the paper pile (3) into a plurality of broken plates in a multi-direction tearing mode, tearing the waste corrugated paper box/plate into broken plates with smaller areas in a physical tearing mode, then controlling the hydraulic paper tearing clamps (41) to reset and release the broken plates, and finally controlling the hydraulic paper tearing clamps (41) to retreat for resetting to enable the broken plates to fall downwards,
a material pushing sub-step, in which the broken board remained on the carton tearing platform (2) is pushed towards one side by a material pushing plate arranged at one side of the carton tearing platform (2) at the first station so as to drop the broken board downwards,
a feeding substep, in which the crushed boards generated in the tearing substep and the pushing substep drop downwards to a conveyer belt (5) arranged below the paper box tearing platform (2), and the crushed boards are conveyed to the upper part of the crushed pulp barrel through the conveyer belt (5), so that the crushed boards drop downwards freely from the tail end of the conveyer belt (5) and fall into the crushed pulp barrel;
a pulping step, injecting clear water into a pulping barrel, stirring at low speed by a stirrer arranged in the pulping barrel after stopping water injection, controlling the rotating speed of the stirrer at 200 revolutions per minute in the low-speed stirring process, controlling the time of the low-speed stirring at 0.5-1 hour, completely soaking the crushed boards by low-speed stirring and soaking to enable the water content of the crushed boards to reach more than 60%, then controlling the stirrer to stir at high speed for pulping treatment, controlling the rotating speed of the stirrer at 1000 revolutions per minute in the pulping treatment process to 2000 revolutions per minute, and discharging pulp through a pulp discharge port arranged at the lower part of the pulping barrel in the middle after finishing the pulping treatment to obtain paper-making primary pulp;
a hydraulic impurity removal step, namely pumping the paper-making raw pulp to a hydraulic impurity removal workshop for hydraulic impurity removal treatment;
a washing step, namely pumping the papermaking raw pulp subjected to the hydraulic impurity removal treatment to a pulp washing tank for washing treatment;
a deslagging step, namely pumping the washed paper-making raw pulp to a deslagging workshop, performing high-concentration deslagging treatment on the washed paper-making raw pulp through high-concentration deslagging equipment in the deslagging workshop, and performing low-concentration deslagging treatment on the washed paper-making raw pulp through low-concentration deslagging equipment;
a bleaching step, namely pumping the papermaking raw pulp subjected to the deslagging step to a first high-speed pulp washing unit, and bleaching the pulp by the first high-speed pulp washing unit;
a filter pressing step, namely pumping the bleached paper-making raw pulp into a filter pressing workshop, performing high-concentration filter pressing treatment on the paper-making raw pulp through high-concentration filter pressing equipment in the filter pressing workshop, and performing low-concentration filter pressing treatment on the paper-making raw pulp through low-concentration filter pressing equipment in the filter pressing workshop;
a flotation deinking step, namely pumping the paper making raw pulp subjected to the filter pressing step to a flotation deinking workshop, and performing flotation deinking treatment through a flotation deinking pool to obtain paper making raw pulp;
a pulping step, namely pumping the papermaking coarse pulp to a pulping workshop, carrying out pulping treatment through a coarse pulping machine, and carrying out fine pulping treatment through a fine pulping machine to obtain primary pulp;
a pulp washing step, namely pumping the primary pulp to a second high-speed pulp washing machine set, and carrying out pulp washing treatment through the second high-speed pulp washing machine set;
a pulp mixing step, namely pumping the primary pulp subjected to pulp washing treatment to a pulp mixing workshop for pulp mixing treatment to obtain papermaking pulp;
a papermaking forming step, namely pumping papermaking slurry to a papermaking forming workshop, continuously spraying the papermaking slurry to the mesh cloth through a spray gun, forming a layered slurry layer on the mesh cloth, and continuously outputting the layered slurry layer;
a squeezing and dewatering treatment step, wherein the layered pulp layer is continuously transferred to a squeezing unit through a first vacuum suction and moving roller, the layered pulp layer is continuously conveyed forwards, and the layered pulp layer is sequentially squeezed through a plurality of squeezing and dewatering rollers of the squeezing unit to dewater the layered pulp layer to obtain a wet paper layer;
a drying treatment step, transferring the wet paper layer to a drying unit through a second vacuum suction shifting roller, continuously conveying the wet paper layer forwards, and drying the wet paper layer to obtain dry paper through a plurality of drying rollers of the drying unit in sequence;
and a post-treatment step, namely performing rewinding treatment, press polishing treatment, surface sizing treatment, slitting treatment and packaging treatment on the dry paper in sequence to obtain the finished corrugated medium paper.
2. The process for producing a waste paper-reconstituted corrugated medium paper with improved bending strength according to claim 1, wherein the process comprises the following steps: and the feeding substep is to enable the top surface of the paper box tearing platform (2) at the initial position to be lower than the top surface of the roller type conveying mechanism (1), form a containing space above the paper box tearing platform (2), enable the waste corrugated paper boxes/boards conveyed to the paper box tearing platform (2) through the roller type conveying mechanism (1) to automatically fall into the containing space, enable the height between the top surface of the paper box tearing platform (2) and the top surface of the roller type conveying mechanism (1) to be enough to accommodate paper piles (3) formed by stacking 30-50 waste corrugated paper boxes/boards up and down, and carry out the clamping substep after the height of the paper piles (3) conveyed into the containing space reaches 20-30 cm.
3. The process for producing a waste paper-reconstituted corrugated medium paper with improved bending strength according to claim 2, wherein: a pushing sub-step is arranged between the feeding sub-step and the pressing sub-step,
a pushing sub-step, wherein push plates with the width of 2-5cm and the height of 30-40cm are respectively arranged at intervals on the periphery of the carton tearing platform (2) at a first station, the bottom surface of each push plate is 0.2-0.5m higher than the top surface of the carton tearing platform (2) at the first station, the waste corrugated cartons/boards falling on the carton tearing platform (2) are pushed towards the central part of the carton tearing platform (2) through the push plates, the waste corrugated cartons/boards falling on the carton tearing platform (2) are gathered towards the central part of the carton tearing platform (2) and are overlapped up and down, and the push plates are controlled to retreat and reset after the hydraulic push rods (22) compress the paper stacks (3) downwards,
in the horizontal projection plane, the width of the paper box tearing platform (2) is smaller than that of the paper pile (3), the length of the paper box tearing platform (2) is smaller than that of the paper pile (3), so that any side edge of the paper pile (3) is relatively protruded by 10-15cm on the same side edge of the paper box tearing platform (2), and the part of the paper pile (3) protruded out of the side edge of the paper box tearing platform (2) is used as a clamping part of the hydraulic paper tearing pliers (41),
in the tearing substep, each of the hydraulic paper tearing nippers (41) is caused to nip the clamping portion.
4. The process for producing a waste paper-reconstituted corrugated medium paper with improved bending strength according to claim 3, wherein: and one push plate is arranged in the gap between two adjacent hydraulic paper tearing clamps (41).
5. The process for producing a waste paper-reconstituted corrugated medium paper with improved bending strength according to claim 4, wherein the process comprises the following steps: the hydraulic paper tearing pliers (41) comprise an upper pliers and a lower pliers, a plurality of sharp teeth are formed on the inner side surfaces of the pliers, and the paper stack (3) is gripped by the sharp teeth of the pliers in the tearing sub-step.
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Application publication date: 20211102 |