CN110924216A - Method for reconstructing corrugated paper by using waste paper - Google Patents
Method for reconstructing corrugated paper by using waste paper Download PDFInfo
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- CN110924216A CN110924216A CN201911113535.9A CN201911113535A CN110924216A CN 110924216 A CN110924216 A CN 110924216A CN 201911113535 A CN201911113535 A CN 201911113535A CN 110924216 A CN110924216 A CN 110924216A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/12—Making corrugated paper or board
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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
- D21B1/303—Defibrating by other means using vibrating devices
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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
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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
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/20—Methods of refining
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- 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
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- 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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Abstract
The invention discloses a method for reconstructing corrugated paper by using waste paper, which comprises a slicing step, a feeding step, an abrasive feeding step, an ultrasonic pulping step, an initial pulp extracting step, an initial pulp processing step and a papermaking step.
Description
Technical Field
The invention relates to the technical field of production processes of corrugated paper, in particular to a method for reconstructing the corrugated paper by using waste paper.
Background
The traditional pulping process adopts large pulping equipment for pulping, a large amount of waste paper is directly put into a large pulping barrel with the effective capacity of about 100-300 tons, the effective capacity of the large pulping barrel of a small paper mill which can be small in the mill is about 50-100 tons, the waste paper needs to be soaked for 2-4 hours before pulping, the waste paper is softened after soaking, then the waste paper is smashed by the high-speed rotation of large stirring pulp arranged at the bottom of the large pulping barrel, the waste paper needs to be completely smashed in the pulping stage, the pulping stage generally needs 1.5-3 hours, and the required cleaning and maintenance time before and after pulping generally needs 1-2 hours, so the total time required for completing one pulping step is about 4-8 hours, the required process time of the traditional pulping process is very long, in addition, the water consumption of the pulping process is very large, the weight ratio of waste paper to water consumption is generally: 10-20, the energy consumption required by the pulping process is also extremely large, the pulping efficiency is relatively low, and the pulping cost is relatively high.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide the method for reproducing the corrugated paper by using the waste paper, which has the advantages of high pulping speed, energy conservation and environmental protection, and reduces the unit energy consumption of pulping.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for reconstructing corrugated paper by using waste paper comprises the following steps,
1) cutting the waste paper box or the waste paper board into strip waste paper with the width of 5-20cm by using a slitting machine, cutting the strip waste paper into block waste paper by using the slitting machine along the transverse direction, and controlling the maximum width of the block waste paper to be less than 20 cm;
2) and a material feeding step, namely putting the blocky waste paper into a large pulping barrel with the effective capacity of 100-300 tons, and simultaneously injecting clear water into the large pulping barrel, wherein the weight ratio of the clear water to the blocky waste paper is 1: 2-5, forming a slurry to be crushed;
3) putting an abrasive into a large pulping barrel, namely putting a cylindrical hollow iron rod with various dimensions into the large pulping barrel, wherein a sealed cavity is arranged in the middle of the iron rod, the mass density of the iron rod is 0.9-1.1, the length of the iron rod is 10-50cm, and the maximum width or diameter of the iron rod is less than 5 cm;
4) and ultrasonic pulping, wherein the large pulping barrel is a D-shaped pulping barrel with a D-shaped transverse section, the D-shaped pulping barrel is provided with a flat barrel wall with a plane shape, a plurality of through holes are formed in the flat barrel wall, an ultrasonic frequency conversion rod is respectively arranged in each through hole and is in sealing fit with the through holes, the inner end of each ultrasonic frequency conversion rod extends into the inner cavity of the D-shaped pulping barrel, the outer end of each ultrasonic frequency conversion rod is respectively exposed out of the large pulping barrel, the outer end of each ultrasonic frequency conversion rod is respectively connected with an ultrasonic generating device,
starting the propeller arranged in the large pulping barrel to start stirring, simultaneously starting the ultrasonic pulping device to start ultrasonic pulping, controlling the time of the ultrasonic pulping to be 30-50 minutes, controlling the rotating speed of the propeller to be 1000-,
ultrasonic waves are transmitted to the to-be-crushed pulp in the D-type pulp crushing barrel through an ultrasonic frequency conversion rod, so that each iron rod absorbs the ultrasonic waves and is suspended in the to-be-crushed pulp, each iron rod rotates in the D-type pulp crushing barrel along with the stirring of the spiral pulp at the same time, the to-be-crushed pulp is dispersed and distributed in the to-be-crushed pulp, clear water in the to-be-crushed pulp and massive waste paper absorb the ultrasonic waves and then move up, the massive waste paper is accelerated and decomposed from the inside on a microscopic level, gravels, metals and impurities in the massive waste paper are separated from the original combination position, meanwhile, fibers in the massive waste paper are relatively separated, the massive waste paper with a loose structure is formed, and the massive waste paper in the to-be-crushed pulp is collided by the water flow effect formed when the spiral pulp is stirred, the impact effect of the barrel wall of the D-type pulp crushing barrel and the iron rod suspended in the to-be-crushed pulp and absorbing the ultrasonic waves and shock, the massive waste paper is burst and is quickly decomposed into fiber bundles or fiber blocks to form fiber pulp;
5) after the ultrasonic pulping is finished, placing a strong electromagnet into the large-sized pulping barrel through an overhead traveling crane, attracting each iron rod through magnetic force, and moving the strong electromagnet out of the large-sized pulping barrel through the overhead traveling crane, so that all the iron rods put into the large-sized pulping barrel are moved out;
6) removing light slag, namely removing the light slag floating on the upper layer of the large-sized slurry crushing barrel through fishing equipment;
7) removing heavy slag, namely removing the heavy slag deposited on the bottom layer of the large slurry crushing barrel through a slag discharge port arranged at the bottom of the large slurry crushing barrel after removing the light slag;
8) the primary pulp extracting step, after heavy slag is removed, discharging fiber pulp in the large pulp crushing barrel through a pulp discharging port arranged at the middle lower part of the bottom of the large pulp crushing barrel to obtain primary pulp;
9) the method comprises the steps of primary pulp treatment, namely, the primary pulp is subjected to coarse screening treatment, coarse pulp grinding treatment, low-concentration filter pressing treatment, fine pulp grinding treatment, fine screening treatment, high-concentration filter pressing treatment, deinking treatment and pulp mixing treatment to obtain papermaking pulp;
10) and a papermaking step, wherein papermaking slurry is used for papermaking forming treatment, pressing treatment, drying treatment, surface sizing treatment, secondary drying treatment, slitting treatment and pressing treatment, and finally corrugated paper is obtained.
Further, the preliminary slurry processing step includes the following sub-steps performed in this order,
9.1) and a coarse screening step, wherein the primary slurry is respectively pumped to one or more coarse screening machines through pipelines for coarse screening treatment, and the coarse screening treatment is carried out for one or more times to screen out impurities;
9.2) and a coarse pulp grinding substep, wherein the coarse pulp subjected to coarse screening is respectively conveyed to one or more coarse pulp grinders through a pipeline for coarse pulp grinding treatment, one or more coarse pulp grinding treatments are carried out, the middle fiber blocks or fiber bundles of the primary pulp are scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.5 cm;
9.3) and a low-concentration pressure filtration substep, wherein the primary slurry after the coarse grinding slurry treatment is respectively pumped to one or more low-concentration pressure filters through pipelines to be subjected to low-concentration pressure filtration treatment, the low-concentration pressure filtration treatment is carried out for one or more times, impurities are filtered, and the mass concentration of the primary slurry is controlled to be 70-80%;
9.4) and a refined pulp substep, wherein the primary pulp subjected to low-concentration pressure filtration treatment is respectively pumped to one or more refined pulp machines through a pipeline for refined pulp treatment, and is subjected to one or more refined pulp treatments, so that the middle fiber blocks or fiber bundles of the primary pulp are further scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.1 cm;
9.5) fine screening, namely, respectively pumping the primary slurry subjected to fine grinding pulp treatment to one or more fine screening machines through pipelines for fine screening treatment, and carrying out one or more times of fine screening treatment to screen out impurities;
9.6) and a high-concentration filter pressing substep, wherein the primary slurry after the fine screening treatment is respectively pumped to one or more high-concentration filter presses through pipelines for high-concentration filter pressing treatment, and the primary slurry is subjected to one or more times of high-concentration filter pressing treatment, so that impurities are filtered, and the concentration of the primary slurry is controlled to be 60-70% by mass;
9.7) deinking treatment substep, the primary pulp after high concentration filter pressing treatment is pumped to a deinking treatment tank through a pipeline for deinking treatment;
9.8) and a pulp mixing treatment substep, wherein the deinked primary pulp is pumped to a pulp mixing box through a pipeline, and the pulp mixing treatment is carried out in the pulp mixing box to obtain papermaking pulp.
Further, the papermaking step includes the following sub-steps performed in sequence,
10.1) a pulp spraying papermaking forming step, pumping the pulp making slurry to a pulp spraying station, spraying the pulp towards the mesh fabric through a plurality of spraying heads, forming a pulp layer on the surface of the mesh fabric, and conveying the pulp layer forwards through the mesh fabric;
10.2) pressing, namely respectively rotating and clamping the mesh cloth and the pulp layer formed on the surface of the mesh cloth by a plurality of pressing rollers arranged in front of the mesh cloth to reduce the water content of the pulp layer to 75-85%;
10.3) a vacuum suction step, wherein the pulp layer after the pressing treatment is sucked from the surface of the mesh cloth to the surface of the felt through the vacuum suction force of a vacuum suction roller arranged at the front end of the mesh cloth, and the pulp layer is conveyed forwards through the felt;
10.4) secondary pressing, namely respectively rotating and clamping the blanket and the pulp layer carried on the surface of the blanket through a plurality of secondary pressing rollers arranged in front of the blanket to reduce the water content of the pulp layer to 65-75%;
10.5) drying, namely, sucking and transferring the secondarily squeezed pulp layer from the surface of the blanket to a drying roller of a primary drying part by a second vacuum suction and moving device arranged in front of the blanket, enabling the pulp layer to sequentially pass through a plurality of drying rollers of the primary drying part, gradually drying the pulp layer by each drying roller of the primary drying part, and finally reducing the water content of the pulp layer to 5-10% to obtain paper conveyed forwards continuously;
10.6), a surface sizing step, namely conveying the paper to a surface sizing roller of a surface sizing machine, and rolling a surface sizing agent prepared by decocting cationic surface sizing starch on one surface or two surfaces of the paper through the surface sizing roller;
10.7) a secondary drying step, conveying the paper subjected to surface sizing treatment to drying rollers of a secondary drying part, enabling the paper to sequentially pass through a plurality of drying rollers of the secondary drying part, and gradually drying the paper through each drying roller of the secondary drying part;
10.8) and finished products, collecting the paper subjected to secondary drying into coils, and performing slitting treatment and pressing treatment to finally obtain the corrugated paper.
Furthermore, in the step of feeding the grinding material, the selected iron rod is in a polygonal cylinder shape, a plurality of needle bodies with different diameters are formed on the surface of the iron rod, the diameter of each needle body is 1-3cm, the height of each needle body is 1-5cm, and the contact probability between the iron rod and each piece of blocky waste paper and the decomposition speed of the blocky waste paper are improved through each side surface of the iron rod and each needle body.
Furthermore, in the ultrasonic pulping step, the length of the inner end of the ultrasonic frequency conversion rod exposed in the large pulping barrel is 30-50cm, the turbulence quantity and the flow velocity of the pulp to be crushed in the rotating process are increased and the water flow grinding force is increased through the ultrasonic frequency conversion rod extending into the large pulping barrel, and the massive waste paper impacting on the ultrasonic frequency conversion rod is directly cracked and decomposed at the impacting position through ultrasonic waves loaded from the ultrasonic frequency conversion rod and conducted out.
Furthermore, in the ultrasonic pulping step, the interior tip integrated into one piece of supersound frequency conversion pole has a reducing head, and the reducing head is whole to be located in the large-scale pulping bucket, the shaping has a chamfer between the interior tip of reducing head and supersound frequency conversion pole, and reducing head middle part protrusion, the diameter of reducing head diminishes to both ends from its middle part gradually, and the surface shaping of reducing head has a plurality of intervals to be provided with the bead, and the outside limit of bead is the arc limit, makes the ultrasonic wave conduct away with a plurality of directions through chamfer, reducing head and bead.
Further, in the ultrasonic pulping step, a random power coefficient and a random frequency coefficient are randomly generated every 1-3 seconds by a random unit arranged in an ultrasonic power controller, the ultrasonic power controller receives the random power coefficient and immediately changes the power of the ultrasonic generating device, so that the power of the ultrasonic generating device is randomly changed between 300 and 500W every 1-3 seconds, the ultrasonic power controller simultaneously receives the random frequency coefficient and immediately changes the frequency of the ultrasonic generating device, the ultrasonic frequency generated by the ultrasonic generating device is randomly changed between 40 and 80Hz every 1-3 seconds, and the amplitude of the finally generated ultrasonic is changed once every 1-3 seconds.
Compared with the prior art, the invention has the advantages that: the invention has high pulping speed, does not damage or break the fiber in the pulping process, reduces the unit energy consumption of pulping, and is more energy-saving and environment-friendly.
Drawings
FIG. 1 is a schematic structural view of a large size pulping barrel equipped with an ultrasonic frequency conversion rod of the present invention.
FIG. 2 is a schematic structural diagram of the inner end of the ultrasonic frequency conversion rod extending into the inner cavity of the large size pulping barrel.
The labels in the figure are: 1. the large-scale pulping barrel 2, the flat barrel wall 3, the ultrasonic frequency conversion rod 4, the reducing head 5, the chamfer 6 and the convex edge.
Detailed Description
The method for reconstructing corrugated paper by using waste paper comprises the following steps,
1) and a step of cutting into blocks, namely cutting the waste paper boxes or the waste paper boards into strip waste paper with the width of 5-20cm by using a slitting machine along the longitudinal direction, cutting the strip waste paper into block waste paper by using the slitting machine along the transverse direction, and controlling the maximum width of the block waste paper to be less than 20 cm.
2) And a feeding step, namely putting the blocky waste paper into a large size pulping barrel 1 with the effective capacity of 100-300 tons, and simultaneously injecting clear water into the large size pulping barrel 1, wherein the weight ratio of the clear water to the blocky waste paper is 1: and 2-5, forming the pulp to be crushed, wherein the effective capacity refers to the volume of the pulp to be crushed which can be contained in the large pulp crushing barrel 1 during normal pulp crushing.
3) The method comprises the following steps of (1) feeding a hollow iron rod with cylinder shapes of various sizes and specifications into a large size pulping barrel (1), wherein a sealed cavity is arranged in the middle of the iron rod, the mass density of the iron rod is 0.9-1.1, the length of the iron rod is 10-50cm, and the maximum width or diameter of the iron rod is less than 5 cm; the shape of the iron rod for selection is polygonal cylinder shape, the surface molding of the iron rod has a plurality of needle bodies with different and different diameters, the diameter of the needle body is 1-3cm, the height of the needle body is 1-5cm, the iron rod is enabled to have more contact surfaces and contact parts, the efficiency of absorbing ultrasonic waves is also higher, the contact probability of the iron rod and each blocky waste paper is improved and the decomposition speed of the blocky waste paper is improved through each side surface of the iron rod and each needle body, in the ultrasonic pulping process, when the side edge of the blocky waste paper is impacted to enter and is clamped in the gap of the needle body, the ultrasonic waves conducted out from the needle bodies vibrate and crush the clamped blocky waste paper at once, the pulping effect is very good, and fibers cannot be damaged in the pulping process.
4) The ultrasonic pulping step, large-scale pulping bucket 1 chooses for use the D type pulping bucket that transverse section is D shape for use, D type pulping bucket has a planar shape flat barrel wall 2, set up a plurality of through-holes at flat barrel wall 2, install an supersound frequency conversion pole 3 respectively at each through-hole, supersound frequency conversion pole 3 gives you the sealed cooperation of through-hole, the inner of supersound frequency conversion pole 3 stretches into in the inner chamber of D type pulping bucket, the outer end of each supersound frequency conversion pole 3 exposes respectively in large-scale pulping bucket 1's outside, supersound generating device is connected respectively to the outer end of each supersound frequency conversion pole 3, it is shown in fig. 1 and 2.
Starting the propeller arranged in the large pulping barrel 1 to start stirring, simultaneously starting the ultrasonic pulping device to start ultrasonic pulping, controlling the time of the ultrasonic pulping to be 30-50 minutes, controlling the rotating speed of the propeller to be 1000-,
ultrasonic waves are transmitted to the to-be-crushed pulp in the D-type pulp crushing barrel through an ultrasonic frequency conversion rod 3, so that each iron rod absorbs the ultrasonic waves and is suspended in the to-be-crushed pulp, each iron rod rotates in the D-type pulp crushing barrel along with the stirring of spiral pulp at the same time, the to-be-crushed pulp is dispersed and distributed in the to-be-crushed pulp, clear water in the to-be-crushed pulp and massive waste paper absorb the ultrasonic waves and then the molecular motion of the inside is promoted, the massive waste paper is accelerated and decomposed from the inside on a microscopic level, gravels, metals and impurities in the massive waste paper are separated from the original combination position, meanwhile, fibers in the massive waste paper are relatively separated, the massive waste paper with a loose structure is formed, and the massive waste paper in the to-be-crushed pulp is collided by the water flow effect formed when the spiral pulp is stirred, the barrel wall of the D-type pulp crushing barrel and the iron rod suspended in the to-crushed pulp and absorb the ultrasonic waves and collide with, so that the massive waste paper is burst and is rapidly decomposed into fiber bundles or fiber blocks to form fiber pulp.
The length of the inner end of the ultrasonic frequency conversion rod 3 exposed in the large-scale pulping barrel 1 is 30-50cm, the amount and the flow velocity of turbulence of the pulp to be crushed in the rotating process are increased and the water flow mincing force is increased through the ultrasonic frequency conversion rod 3 extending into the large-scale pulping barrel 1, and the massive waste paper impacting on the ultrasonic frequency conversion rod 3 is directly cracked and decomposed at the impacting position through ultrasonic waves loaded and conducted from the ultrasonic frequency conversion rod 3.
The inside end integrated into one piece of supersound frequency conversion pole 3 has a reducing head 4, reducing head 4 is whole to be located large-scale broken thick liquid bucket 1, the shaping has a chamfer 5 between the inside end of reducing head 4 and supersound frequency conversion pole 3, reducing head 4 middle part protrusion, the diameter of reducing head 4 diminishes from its middle part to both ends gradually, the surface shaping of reducing head 4 has a plurality of intervals to be provided with bead 6, the outside limit of bead 6 is the arc limit, through chamfer 5, reducing head 4 and bead 6 make the ultrasonic wave conduct away with a plurality of directions, make to have the ultrasonic wave of conducting along a plurality of directions simultaneously in large-scale broken thick liquid bucket 1, make the inside different internal forces that have of cubic waste paper that absorbs a plurality of ultrasonic waves along different conducting directions simultaneously, from the inside decomposition speed of cubic waste paper that accelerates.
In the ultrasonic pulping step, a random power coefficient and a random frequency coefficient are randomly generated every 1-3 seconds by a random unit arranged in an ultrasonic power controller, the ultrasonic power controller receives the random power coefficient and immediately changes the power of an ultrasonic generating device, so that the power of the ultrasonic generating device is randomly changed between 300 and 500W every 1-3 seconds, the ultrasonic power controller simultaneously receives the random frequency coefficient and immediately changes the frequency of the ultrasonic generating device, the ultrasonic frequency generated by the ultrasonic generating device is randomly changed between 40 and 80Hz every 1-3 seconds, and the amplitude of finally generated ultrasonic waves is changed once every 1-3 seconds. The resonance points of the materials with different materials, different volumes and different weights in the blocky waste paper to the ultrasound are different, so that the materials are continuously changed in the pulping process, and the power, the frequency and the amplitude of the materials are continuously and randomly changed in the ultrasonic pulping process, so that the blocky waste paper in the blocky waste paper keeps the most efficient decomposition speed in the whole ultrasonic pulping process.
5) After the ultrasonic pulping is finished, placing a strong electromagnet into the large-sized pulping barrel 1 through an overhead traveling crane, attracting each iron rod through magnetic force, and moving the strong electromagnet out of the large-sized pulping barrel 1 through the overhead traveling crane, so that all the iron rods put into the large-sized pulping barrel 1 are moved out;
6) removing light slag, namely removing the light slag floating on the upper layer of the large-sized slurry crushing barrel 1 through fishing equipment;
7) removing heavy slag, namely removing the heavy slag deposited on the bottom layer of the large size pulp crushing barrel 1 through a slag discharge port arranged at the bottom of the large size pulp crushing barrel 1 after removing the light slag;
8) a primary pulp extracting step of discharging the fiber pulp in the large pulp crushing barrel 1 through a pulp discharge port arranged at the middle lower part of the bottom of the large pulp crushing barrel 1 after heavy slag is discharged, so as to obtain primary pulp;
9) the method comprises the steps of primary pulp treatment, namely, the primary pulp is subjected to coarse screening treatment, coarse pulp grinding treatment, low-concentration filter pressing treatment, fine pulp grinding treatment, fine screening treatment, high-concentration filter pressing treatment, deinking treatment and pulp mixing treatment to obtain papermaking pulp; specifically, the preliminary slurry treatment step includes the following substeps performed in this order,
9.1) and a coarse screening step, wherein the primary slurry is respectively pumped to one or more coarse screening machines through pipelines for coarse screening treatment, and is subjected to one or more coarse screening treatments to screen out impurities;
9.2) and a coarse pulp grinding substep, wherein the coarse pulp subjected to coarse screening is respectively conveyed to one or more coarse pulp grinders through a pipeline for coarse pulp grinding treatment, one or more coarse pulp grinding treatments are carried out, the middle fiber blocks or fiber bundles of the primary pulp are scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.5 cm;
9.3) and a low-concentration pressure filtration substep, wherein the primary slurry after the coarse grinding slurry treatment is respectively pumped to one or more low-concentration pressure filters through pipelines to be subjected to low-concentration pressure filtration treatment, the low-concentration pressure filtration treatment is carried out for one or more times, impurities are filtered, and the mass concentration of the primary slurry is controlled to be 70-80%;
9.4) and a refined pulp substep, wherein the primary pulp subjected to low-concentration pressure filtration treatment is respectively pumped to one or more refined pulp machines through a pipeline for refined pulp treatment, and is subjected to one or more refined pulp treatments, so that the middle fiber blocks or fiber bundles of the primary pulp are further scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.1 cm;
9.5) fine screening, namely, respectively pumping the primary slurry subjected to fine grinding pulp treatment to one or more fine screening machines through pipelines for fine screening treatment, and carrying out one or more times of fine screening treatment to screen out impurities;
9.6) and a high-concentration filter pressing substep, wherein the primary slurry after the fine screening treatment is respectively pumped to one or more high-concentration filter presses through pipelines for high-concentration filter pressing treatment, and the primary slurry is subjected to one or more times of high-concentration filter pressing treatment, so that impurities are filtered, and the concentration of the primary slurry is controlled to be 60-70% by mass;
9.7) deinking treatment substep, the primary pulp after high concentration filter pressing treatment is pumped to a deinking treatment tank through a pipeline for deinking treatment;
9.8) and a pulp mixing treatment substep, wherein the deinked primary pulp is pumped to a pulp mixing box through a pipeline, and the pulp mixing treatment is carried out in the pulp mixing box to obtain papermaking pulp.
10) And a papermaking step, wherein papermaking slurry is used for papermaking forming treatment, pressing treatment, drying treatment, surface sizing treatment, secondary drying treatment, slitting treatment and pressing treatment, and finally corrugated paper is obtained.
Specifically, the papermaking step includes the following sub-steps performed in sequence,
10.1) a pulp spraying papermaking forming step, pumping the pulp making slurry to a pulp spraying station, spraying the pulp towards the mesh fabric through a plurality of spraying slurries, forming a pulp layer on the surface of the mesh fabric, and conveying the pulp layer forwards through the mesh fabric;
10.2) pressing, namely respectively rotating and clamping the mesh cloth and the pulp layer formed on the surface of the mesh cloth by a plurality of pressing rollers arranged in front of the mesh cloth to reduce the water content of the pulp layer to 75-85%;
10.3) a vacuum suction step, wherein the pulp layer after the pressing treatment is sucked from the surface of the mesh cloth to the surface of the felt through the vacuum suction force of a vacuum suction roller arranged at the front end of the mesh cloth, and the pulp layer is conveyed forwards through the felt;
10.4) secondary pressing, namely respectively rotating and clamping the blanket and the pulp layer carried on the surface of the blanket through a plurality of secondary pressing rollers arranged in front of the blanket to reduce the water content of the pulp layer to 65-75%;
10.5) drying, namely, sucking and transferring the secondarily squeezed pulp layer from the surface of the blanket to a drying roller of a primary drying part by a second vacuum suction and moving device arranged in front of the blanket, enabling the pulp layer to sequentially pass through a plurality of drying rollers of the primary drying part, gradually drying the pulp layer by each drying roller of the primary drying part, and finally reducing the water content of the pulp layer to 5-10% to obtain paper conveyed forwards continuously;
10.6), a surface sizing step, namely conveying the paper to a surface sizing roller of a surface sizing machine, and rolling a surface sizing agent prepared by decocting cationic surface sizing starch on one surface or two surfaces of the paper through the surface sizing roller;
10.7) a secondary drying step, conveying the paper subjected to surface sizing treatment to drying rollers of a secondary drying part, enabling the paper to sequentially pass through a plurality of drying rollers of the secondary drying part, and gradually drying the paper through each drying roller of the secondary drying part;
10.8) and finished products, collecting the paper subjected to secondary drying into coils, and performing slitting treatment and pressing treatment to finally obtain the corrugated paper.
Claims (7)
1. The method for reconstructing corrugated paper by using waste paper is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
1) cutting the waste paper box or the waste paper board into strip waste paper with the width of 5-20cm by using a slitting machine, cutting the strip waste paper into block waste paper by using the slitting machine along the transverse direction, and controlling the maximum width of the block waste paper to be less than 20 cm;
2) and a material feeding step, namely putting the blocky waste paper into a large pulping barrel with the effective capacity of 100-300 tons, and simultaneously injecting clear water into the large pulping barrel, wherein the weight ratio of the clear water to the blocky waste paper is 1: 2-5, forming a slurry to be crushed;
3) putting an abrasive into a large pulping barrel, namely putting a cylindrical hollow iron rod with various dimensions into the large pulping barrel, wherein a sealed cavity is arranged in the middle of the iron rod, the mass density of the iron rod is 0.9-1.1, the length of the iron rod is 10-50cm, and the maximum width or diameter of the iron rod is less than 5 cm;
4) and ultrasonic pulping, wherein the large pulping barrel is a D-shaped pulping barrel with a D-shaped transverse section, the D-shaped pulping barrel is provided with a flat barrel wall with a plane shape, a plurality of through holes are formed in the flat barrel wall, an ultrasonic frequency conversion rod is respectively arranged in each through hole and is in sealing fit with the through holes, the inner end of each ultrasonic frequency conversion rod extends into the inner cavity of the D-shaped pulping barrel, the outer end of each ultrasonic frequency conversion rod is respectively exposed out of the large pulping barrel, the outer end of each ultrasonic frequency conversion rod is respectively connected with an ultrasonic generating device,
starting the propeller arranged in the large pulping barrel to start stirring, simultaneously starting the ultrasonic pulping device to start ultrasonic pulping, controlling the time of the ultrasonic pulping to be 30-50 minutes, controlling the rotating speed of the propeller to be 1000-,
ultrasonic waves are transmitted to the to-be-crushed pulp in the D-type pulp crushing barrel through an ultrasonic frequency conversion rod, so that each iron rod absorbs the ultrasonic waves and is suspended in the to-be-crushed pulp, each iron rod rotates in the D-type pulp crushing barrel along with the stirring of the spiral pulp at the same time, the to-be-crushed pulp is dispersed and distributed in the to-be-crushed pulp, clear water in the to-be-crushed pulp and massive waste paper absorb the ultrasonic waves and then move up, the massive waste paper is accelerated and decomposed from the inside on a microscopic level, gravels, metals and impurities in the massive waste paper are separated from the original combination position, meanwhile, fibers in the massive waste paper are relatively separated, the massive waste paper with a loose structure is formed, and the massive waste paper in the to-be-crushed pulp is collided by the water flow effect formed when the spiral pulp is stirred, the impact effect of the barrel wall of the D-type pulp crushing barrel and the iron rod suspended in the to-be-crushed pulp and absorbing the ultrasonic waves and shock, the massive waste paper is burst and is quickly decomposed into fiber bundles or fiber blocks to form fiber pulp;
5) after the ultrasonic pulping is finished, placing a strong electromagnet into the large-sized pulping barrel through an overhead traveling crane, attracting each iron rod through magnetic force, and moving the strong electromagnet out of the large-sized pulping barrel through the overhead traveling crane, so that all the iron rods put into the large-sized pulping barrel are moved out;
6) removing light slag, namely removing the light slag floating on the upper layer of the large-sized slurry crushing barrel through fishing equipment;
7) removing heavy slag, namely removing the heavy slag deposited on the bottom layer of the large slurry crushing barrel through a slag discharge port arranged at the bottom of the large slurry crushing barrel after removing the light slag;
8) the primary pulp extracting step, after heavy slag is removed, discharging fiber pulp in the large pulp crushing barrel through a pulp discharging port arranged at the middle lower part of the bottom of the large pulp crushing barrel to obtain primary pulp;
9) the method comprises the steps of primary pulp treatment, namely, the primary pulp is subjected to coarse screening treatment, coarse pulp grinding treatment, low-concentration filter pressing treatment, fine pulp grinding treatment, fine screening treatment, high-concentration filter pressing treatment, deinking treatment and pulp mixing treatment to obtain papermaking pulp;
10) and a papermaking step, wherein papermaking slurry is used for papermaking forming treatment, pressing treatment, drying treatment, surface sizing treatment, secondary drying treatment, slitting treatment and pressing treatment, and finally corrugated paper is obtained.
2. The method of claim 1 for reconstructing corrugated paper from waste paper, comprising:
the preliminary slurry processing step includes the following substeps performed in this order,
9.1) and a coarse screening step, wherein the primary slurry is respectively pumped to one or more coarse screening machines through pipelines for coarse screening treatment, and the coarse screening treatment is carried out for one or more times to screen out impurities;
9.2) and a coarse pulp grinding substep, wherein the coarse pulp subjected to coarse screening is respectively conveyed to one or more coarse pulp grinders through a pipeline for coarse pulp grinding treatment, one or more coarse pulp grinding treatments are carried out, the middle fiber blocks or fiber bundles of the primary pulp are scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.5 cm;
9.3) and a low-concentration pressure filtration substep, wherein the primary slurry after the coarse grinding slurry treatment is respectively pumped to one or more low-concentration pressure filters through pipelines to be subjected to low-concentration pressure filtration treatment, the low-concentration pressure filtration treatment is carried out for one or more times, impurities are filtered, and the mass concentration of the primary slurry is controlled to be 70-80%;
9.4) and a refined pulp substep, wherein the primary pulp subjected to low-concentration pressure filtration treatment is respectively pumped to one or more refined pulp machines through a pipeline for refined pulp treatment, and is subjected to one or more refined pulp treatments, so that the middle fiber blocks or fiber bundles of the primary pulp are further scattered, and the average width of the fiber blocks or fiber bundles in the primary pulp is controlled to be less than 0.1 cm;
9.5) fine screening, namely, respectively pumping the primary slurry subjected to fine grinding pulp treatment to one or more fine screening machines through pipelines for fine screening treatment, and carrying out one or more times of fine screening treatment to screen out impurities;
9.6) and a high-concentration filter pressing substep, wherein the primary slurry after the fine screening treatment is respectively pumped to one or more high-concentration filter presses through pipelines for high-concentration filter pressing treatment, and the primary slurry is subjected to one or more times of high-concentration filter pressing treatment, so that impurities are filtered, and the concentration of the primary slurry is controlled to be 60-70% by mass;
9.7) deinking treatment substep, the primary pulp after high concentration filter pressing treatment is pumped to a deinking treatment tank through a pipeline for deinking treatment;
9.8) and a pulp mixing treatment substep, wherein the deinked primary pulp is pumped to a pulp mixing box through a pipeline, and the pulp mixing treatment is carried out in the pulp mixing box to obtain papermaking pulp.
3. The method of claim 2 for reconstructing corrugated paper from waste paper, comprising:
the papermaking step includes the following sub-steps performed in sequence,
10.1) a pulp spraying papermaking forming step, pumping the pulp making slurry to a pulp spraying station, spraying the pulp towards the mesh fabric through a plurality of spraying heads, forming a pulp layer on the surface of the mesh fabric, and conveying the pulp layer forwards through the mesh fabric;
10.2) pressing, namely respectively rotating and clamping the mesh cloth and the pulp layer formed on the surface of the mesh cloth by a plurality of pressing rollers arranged in front of the mesh cloth to reduce the water content of the pulp layer to 75-85%;
10.3) a vacuum suction step, wherein the pulp layer after the pressing treatment is sucked from the surface of the mesh cloth to the surface of the felt through the vacuum suction force of a vacuum suction roller arranged at the front end of the mesh cloth, and the pulp layer is conveyed forwards through the felt;
10.4) secondary pressing, namely respectively rotating and clamping the blanket and the pulp layer carried on the surface of the blanket through a plurality of secondary pressing rollers arranged in front of the blanket to reduce the water content of the pulp layer to 65-75%;
10.5) drying, namely, sucking and transferring the secondarily squeezed pulp layer from the surface of the blanket to a drying roller of a primary drying part by a second vacuum suction and moving device arranged in front of the blanket, enabling the pulp layer to sequentially pass through a plurality of drying rollers of the primary drying part, gradually drying the pulp layer by each drying roller of the primary drying part, and finally reducing the water content of the pulp layer to 5-10% to obtain paper conveyed forwards continuously;
10.6), a surface sizing step, namely conveying the paper to a surface sizing roller of a surface sizing machine, and rolling a surface sizing agent prepared by decocting cationic surface sizing starch on one surface or two surfaces of the paper through the surface sizing roller;
10.7) a secondary drying step, conveying the paper subjected to surface sizing treatment to drying rollers of a secondary drying part, enabling the paper to sequentially pass through a plurality of drying rollers of the secondary drying part, and gradually drying the paper through each drying roller of the secondary drying part;
10.8) and finished products, collecting the paper subjected to secondary drying into coils, and performing slitting treatment and pressing treatment to finally obtain the corrugated paper.
4. The method of using waste paper for reconstruction of corrugated paper according to any of claims 1 to 3, characterized in that: in the step of feeding the grinding materials, the selected iron rod is in a polygonal cylinder shape, a plurality of needle bodies with different diameters are formed on the surface of the iron rod, the diameter of each needle body is 1-3cm, the height of each needle body is 1-5cm, and the contact probability of the iron rod and each piece of blocky waste paper is improved through each side surface of the iron rod and each needle body, and the decomposition speed of the blocky waste paper is improved.
5. The method of claim 4 for reconstructing corrugated paper from waste paper, comprising: in the ultrasonic pulping step, the length of the inner end of the ultrasonic frequency conversion rod exposed in the large pulping barrel is 30-50cm, the amount and the flow speed of turbulence of the pulp to be crushed in the rotating process are increased and the water flow mincing force is increased through the ultrasonic frequency conversion rod extending into the large pulping barrel, and the massive waste paper impacting on the ultrasonic frequency conversion rod is directly cracked and decomposed at the impacting position through ultrasonic waves loaded from the ultrasonic frequency conversion rod and conducted out.
6. The method of claim 5 for reconstructing corrugated paper from waste paper, comprising: in the supersound pulping step interior tip integrated into one piece of supersound frequency conversion pole has a reducing head, and the reducing head is whole to be located in the large-scale pulping bucket, the shaping has a chamfer between the interior tip of reducing head and supersound frequency conversion pole, and reducing head middle part is salient, and the diameter of reducing head diminishes to both ends from its middle part gradually, and the surface shaping of reducing head has a plurality of intervals to be provided with the bead, and the outside limit of bead is the arc limit, makes the ultrasonic wave conduct away with a plurality of directions through chamfer, reducing head and bead.
7. The method of claim 6, further comprising: in the ultrasonic pulping step, a random power coefficient and a random frequency coefficient are randomly generated every 1-3 seconds by a random unit arranged in an ultrasonic power controller, the ultrasonic power controller receives the random power coefficient and immediately changes the power of an ultrasonic generating device, so that the power of the ultrasonic generating device is randomly changed between 300 and 500W every 1-3 seconds, the ultrasonic power controller simultaneously receives the random frequency coefficient and immediately changes the frequency of the ultrasonic generating device, the ultrasonic frequency generated by the ultrasonic generating device is randomly changed between 40 and 80Hz every 1-3 seconds, and the amplitude of finally generated ultrasonic waves is changed once every 1-3 seconds.
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