CN114837013A - Aramid paper re-copying method and system - Google Patents
Aramid paper re-copying method and system Download PDFInfo
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- CN114837013A CN114837013A CN202210548291.2A CN202210548291A CN114837013A CN 114837013 A CN114837013 A CN 114837013A CN 202210548291 A CN202210548291 A CN 202210548291A CN 114837013 A CN114837013 A CN 114837013A
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- 229920003235 aromatic polyamide Polymers 0.000 title claims abstract description 70
- 239000004760 aramid Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 90
- 239000008367 deionised water Substances 0.000 claims abstract description 44
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 40
- 239000002893 slag Substances 0.000 claims abstract description 30
- 239000002699 waste material Substances 0.000 claims abstract description 26
- 238000004537 pulping Methods 0.000 claims abstract description 17
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 16
- 238000003860 storage Methods 0.000 claims abstract description 15
- 238000002791 soaking Methods 0.000 claims abstract description 12
- 239000011259 mixed solution Substances 0.000 claims description 30
- 238000011282 treatment Methods 0.000 claims description 30
- 238000001035 drying Methods 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 7
- 238000011221 initial treatment Methods 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 230000000717 retained effect Effects 0.000 claims description 3
- 239000000843 powder Substances 0.000 claims description 2
- 230000026676 system process Effects 0.000 claims 1
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract description 2
- 239000012634 fragment Substances 0.000 abstract 2
- 239000003153 chemical reaction reagent Substances 0.000 abstract 1
- 238000000053 physical method Methods 0.000 abstract 1
- 238000003912 environmental pollution Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000005662 electromechanics Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
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- 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
- D21H13/00—Pulp or paper, comprising synthetic cellulose or non-cellulose fibres or web-forming material
- D21H13/10—Organic non-cellulose fibres
- D21H13/20—Organic non-cellulose fibres from macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H13/26—Polyamides; Polyimides
-
- 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
- D21B1/06—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods
- D21B1/08—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by dry methods the raw material being waste paper; the raw material being rags
-
- 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
-
- 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
- D21B1/342—Mixing apparatus
-
- 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
- D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
- D21C5/02—Working-up waste paper
-
- 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
-
- 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
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- 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
Abstract
The invention discloses a method and a system for re-making aramid fiber paper, and particularly relates to the technical field of recycling of aramid fiber composite materials, wherein the aramid fiber paper adopts waste aramid fiber paper, and the method specifically comprises the following steps: cutting aramid fiber paper into pieces with the length size smaller than 0.5mm by a grinder, then placing the pieces and deionized water into a high-speed centrifugal stirrer for soaking and stirring, finally leading the pieces into a pulping machine for grinding to obtain aramid fiber paper fragments with the size smaller than 0.1mm, feeding the aramid fiber paper fragments into a pulp storage tank through a slag remover for batching, wherein the papermaking amount of the added paper is 5-10% each time, and the fresh pulp accounts for 90-95%. According to the invention, the aramid paper is subjected to high-precision crushing, the crushed aramid paper scraps are soaked, stirred and ground to obtain paper pulp with the size smaller than 0.1mm, the aramid paper which is difficult to degrade in the environment is treated by a physical method, secondary pollution to the environment caused by using a chemical reagent is avoided, useful resources are effectively applied, and harmful resources are properly solved.
Description
Technical Field
The invention relates to the technical field of aramid fiber composite material recovery, in particular to an aramid fiber paper re-making method and system.
Background
Aramid paper belongs to aramid composite materials, and mainly comprises two types, namely meta-aramid paper and para-aramid paper, and has the characteristics of thermal stability, high temperature resistance, ageing resistance, electric insulativity and the like, so that the aramid paper is widely applied to various aspects of national economy such as national defense, aerospace, electromechanics, buildings, automobiles, sports goods and the like.
The method and the system for re-making the aramid fiber paper provided by the invention have the advantages that the vitrified aramid fiber paper is re-made into pulp in a physical mode, the problem of environmental pollution caused by difficult degradation of the aramid fiber paper is solved, and the utilization rate of the aramid fiber paper is improved.
Disclosure of Invention
In order to overcome the defects in the prior art, the embodiment of the invention provides an aramid fiber paper re-making method and system, the paper shredder is used for high-stability crushing, the paper scraps with the size larger than 0.5mm are subjected to secondary crushing, the high-precision crushing of the paper scraps is realized, the aramid fiber shredded paper is obtained, the crushed aramid fiber shredded paper and deionized water are added into a storage tank according to the mass ratio of 1:100 for soaking and stirring, paper pulp with the size of less than 0.1mm of the aramid fiber paper is formed after the treatment of a pulp grinder, the vitrified aramid fiber paper can be made into pulp again, the problem of environmental pollution caused by difficult degradation of the aramid fiber paper is solved, the utilization rate of the aramid fiber paper is improved, meanwhile, the environmental pollution caused by recycling the aramid fiber paper in a chemical mode is avoided, and the problems in the background technology are solved.
In order to achieve the purpose, the invention provides the following technical scheme: a method for re-making aramid fiber paper adopts waste aramid fiber paper.
In order to achieve the purpose, the aramid fiber paper back-papermaking method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the cracked aramid fiber shredded paper in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 30-60 minutes at normal temperature and normal pressure, finally starting a high-speed centrifugal machine for stirring, stirring for 30-45 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding the aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 15-30 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 15 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for processing for 2 to 3 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
stage one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 1.5-2kg/pa, and performing slag removal treatment in stage two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps are smaller than 1mm, directly entering a pulp storage tank, and if the pulp lumps are larger than or equal to 1 mm;
stage two, the pulp mass which is processed in stage one and is larger than or equal to 1mm is processed in two stages, the pulp mass which is larger than or equal to 1mm is mainly filtered, the pressure of a slag remover is 0.5-1kg/pa, and the pulp mass which is smaller than 1mm is conveyed to a pulp storage tank;
step five: adding 5-10% of aramid paper recovered pulp and 90-95% of new pulp into each batch of base paper;
step six: adjusting the speed of a paper machine to 20-50m/min, and controlling the net surfing concentration to 0.1-10 per mill, and uniformly making paper by controlling the uniformity;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
In a preferred embodiment, in the step one, the shredder rotates at 180 r/min, the number of shredded paper is 10-15 sheets per time, the shredded paper is in a shape of powder less than 0.5mm, and the retained paper scrap greater than 0.5mm is subjected to secondary shredding.
In a preferred embodiment, the rotation speed of the high-speed centrifugal stirrer in the second step is 8000 rpm, the temperature is 25 ℃, and the pressure is 1.01 kpa.
In a preferred embodiment, in the seventh step, the drying environment of the dryer is a ventilated environment with a temperature of 50-80 ℃, and the drying is performed uniformly at a speed of 5 m/min.
The invention provides a method for re-making aramid fiber paper, and particularly further comprises a re-making system flow for re-making aramid fiber paper.
The invention has the technical effects and advantages that:
1. high-stability crushing is carried out on waste aramid paper by a paper shredder, secondary crushing is carried out on paper scraps which are retained and have the size larger than 0.5mm, high-precision crushing of the paper scraps is realized, aramid paper scraps are obtained, the crushed aramid paper scraps and deionized water are added into a storage tank according to the mass ratio of 1:100 for soaking and stirring, paper pulp with the size smaller than 0.1mm of the aramid paper is formed after treatment by a pulping machine, two-stage deslagging operation is carried out on the paper pulp, pulp groups are smaller than 1mm for papermaking, and the vitrified aramid paper is made into pulp again by adopting a physical mode, so that the problem of environmental pollution caused by difficult degradation of the aramid paper is solved, the utilization rate of the aramid paper is improved, and meanwhile, the environmental pollution caused by a chemical recovery method is avoided;
2. the aramid fiber paper is mixed with the deionized water at a high concentration of 1:100, so that composite fibers in the aramid fiber paper are favorably defibered through a stirrer, the aramid fiber paper is enabled to obtain a higher specific surface area, the deionized water is added again after the aramid fiber paper and the deionized water are mixed at a high concentration of 1:100, the mixed concentration of the aramid fiber paper and the deionized water is enabled to be 1:1000, the mixed concentration of the aramid fiber paper and the deionized water is further reduced, a pulping machine can carry out pulping treatment on the aramid fiber paper, meanwhile, secondary deslagging treatment is carried out on the pulp after pulping through a deslagging machine, pulp clusters larger than or equal to 1mm are separated from pulp clusters smaller than 1mm, and the final papermaking accuracy of the aramid fiber paper is improved.
Detailed Description
Example 1:
the embodiment provides a method for re-making aramid fiber paper, wherein the aramid fiber paper adopts waste aramid fiber paper.
In order to achieve the purpose, the aramid fiber paper back-making method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the cracked aramid fiber shredded paper in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 35 minutes at normal temperature and normal pressure, finally starting a high-speed centrifuge for stirring, stirring for 30 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 15 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 15 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for treatment for 2 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
step one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 1.5kg/pa, and performing slag removal treatment in a step two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps are smaller than 1mm, directly entering a pulp storage tank, or else, performing slag removal treatment in a step two;
step two, performing two-stage treatment on the pulp cluster which is treated in the step one and is larger than or equal to 1mm, mainly filtering the pulp cluster which is larger than or equal to 1mm, controlling the pressure of a slag remover to be 0.5kg/pa, and conveying the pulp cluster which is smaller than 1mm to a pulp storage tank;
step five: adding 5% of aramid paper recovered pulp and 95% of new pulp into each batch of base paper;
step six: the speed of the paper machine is adjusted to 25m/min, the net surfing concentration is 0.4 per mill, and uniform paper making is well controlled;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
In this embodiment, through adopting and soaking the preliminary treatment between aramid fiber shredded paper and the deionized water, can make the inside of deionized water infiltration aramid fiber shredded paper, improve the final stirring effect of aramid fiber shredded paper and deionized water, and utilize the different ratio between two sets of stages aramid fiber shredded paper and the deionized water to mix, improve the primary mixed solution and the final mixed solution between the mixed concentration, obtain higher specific surface area, in the slagging-off process, through the slagging-off mode that adopts two sets of stages, separate the inside more than or equal to 1 mm's of pulp group, obtain meticulous pulp group, improve the final manufacturing accuracy of aramid fiber paper.
Example 2:
the embodiment provides a method for re-making aramid fiber paper, wherein the aramid fiber paper adopts waste aramid fiber paper.
In order to achieve the purpose, the aramid fiber paper back-making method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the aramid fiber shredded paper cracked in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 40 minutes at normal temperature and normal pressure, finally starting a high-speed centrifuge for stirring, stirring for 35 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 20 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 15 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for processing for 2.5 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
step one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 1.8kg/pa, and performing slag removal treatment in a step two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps are smaller than 1mm, directly entering a pulp storage tank, or else, performing slag removal treatment in a step two;
step two, performing two-stage treatment on the pulp cluster which is treated in the step one and is larger than or equal to 1mm, mainly filtering the pulp cluster which is larger than or equal to 1mm, controlling the pressure of a slag remover to be 0.7kg/pa, and conveying the pulp cluster which is smaller than 1mm to a pulp storage tank;
step five: adding 8% of aramid paper recovered pulp and 92% of new pulp into each batch of base paper;
step six: the speed of the paper machine is adjusted to 30m/min, the net surfing concentration is 1.8 per mill, and the uniformity is well controlled to uniformly make paper;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
In the present embodiment, the difference with respect to embodiment 1 is that in embodiment 2, the aramid shredded paper and the deionized water are soaked for 40 minutes and stirred for 35 minutes, the soaking time and the stirring time are obviously prolonged, the aramid shredded paper and the deionized water can be fully contacted, the deionized water can fully permeate into the aramid shredded paper, the concentration between the primary aramid mixed solution and the final mixed solution is changed by changing the stirring modes and the stirring time in different proportions in the two stages, and the pulp mass after deslagging is less than 1mm through two sets of stages with different pressures, so that the precision after the aramid paper is rewrited is improved.
Example 3:
the embodiment provides a method for re-making aramid fiber paper, wherein the aramid fiber paper adopts waste aramid fiber paper.
In order to achieve the purpose, the aramid fiber paper back-making method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the cracked aramid fiber shredded paper in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 50 minutes at normal temperature and normal pressure, finally starting a high-speed centrifuge for stirring, stirring for 40 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 20 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 20 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for processing for 3 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
step one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 2kg/pa, and performing slag removal treatment in a step two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps after slag removal are smaller than 1mm, directly entering a pulp storage tank, and if the pulp lumps are larger than or equal to 1 mm;
step two, performing two-stage treatment on the pulp cluster which is treated in the step one and is larger than or equal to 1mm, mainly filtering the pulp cluster which is larger than or equal to 1mm, controlling the pressure of a slag remover to be 1kg/pa, and conveying the pulp cluster which is smaller than 1mm to a pulp storage tank;
step five: adding 10% of aramid paper recovered pulp and 90% of new pulp into each batch of base paper;
step six: adjusting the speed of a paper machine to 40m/min, controlling the net surfing concentration to be 5 per mill, and uniformly making paper by controlling the uniformity;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
In this embodiment, relative with embodiment 2 difference lie in, soak 50 minutes between aramid fiber shredded paper and the deionized water, improve the effect that the deionized water permeates, and the churning time between aramid fiber shredded paper and the deionized water has been reduced, and then improve the stirring efficiency between aramid fiber shredded paper and the deionized water, simultaneously through the different pressure slag removers that change two kinds of stages, carry out the slagging-off processing to the pulp group respectively, can be when first slagging-off stage with the inside pulp group separation that is greater than or equal to 1mm of pulp group fast, reduce the slagging-off time under the second slagging-off stage, improve the precision of slagging-off simultaneously.
Example 4:
the embodiment provides a method for re-making aramid fiber paper, wherein the aramid fiber paper adopts waste aramid fiber paper.
In order to achieve the purpose, the aramid fiber paper back-making method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the cracked aramid fiber shredded paper in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 60 minutes at normal temperature and normal pressure, finally starting a high-speed centrifuge for stirring, stirring for 45 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 30 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 15 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for processing for 3 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
step one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 2kg/pa, and performing slag removal treatment in a step two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps after slag removal are smaller than 1mm, directly entering a pulp storage tank, and if the pulp lumps are larger than or equal to 1 mm;
step two, performing two-stage treatment on the pulp cluster which is treated in the step one and is larger than or equal to 1mm, mainly filtering the pulp cluster which is larger than or equal to 1mm, controlling the pressure of a slag remover to be 1kg/pa, and conveying the pulp cluster which is smaller than 1mm to a pulp storage tank;
step five: adding 6% of aramid paper recovered pulp and 94% of new pulp into each batch of base paper;
step six: adjusting the speed of a paper machine to 45m/min, controlling the net surfing concentration to be 8 per mill, and uniformly making paper by controlling the uniformity;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
In this embodiment, the difference with respect to embodiment 3 is that the soaking time and the stirring time of the aramid shredded paper and the deionized water are significantly lengthened, and when the aramid shredded paper is pretreated, the efficiency of the aramid shredded paper becoming a mixed solution can be accelerated, the time consumed by stirring can be reduced, the body surface area inside the mixed solution is further increased, the mixed concentration is improved, and meanwhile, the final manufacturing effect of the aramid paper is improved by increasing the adding proportion of the aramid paper recycled pulp and the new pulp.
And finally: the above description is only exemplary of the invention and is not intended to limit the invention, which is intended to cover any variations, equivalents, or improvements made within the spirit and scope of the invention.
Claims (6)
1. A method for re-making aramid fiber paper is characterized by comprising the following steps: the aramid paper is waste aramid paper.
2. The aramid paper re-papermaking method according to claim 1, characterized in that: the method specifically comprises the following steps:
the method comprises the following steps: preparing waste aramid paper, and shredding the waste aramid paper by a shredder to break the waste aramid paper into aramid shredded paper with the size of less than 0.5 mm;
step two: adding the cracked aramid fiber shredded paper in the step one into a high-speed centrifugal stirrer, adding deionized water, soaking for 30-60 minutes at normal temperature and normal pressure, finally starting a high-speed centrifugal machine for stirring, stirring for 30-45 minutes under full load, and dividing the aramid fiber shredded paper and the deionized water into two operation stages in the stirring process;
adding the aramid fiber shredded paper and deionized water into a high-speed centrifugal stirrer according to the mass ratio of 1:100, and stirring for 15-30 minutes to obtain a primary aramid fiber mixed solution;
and step two, on the basis of the step one, continuously adding deionized water into the primary aramid fiber mixed solution, and stirring for 15 minutes along with a high-speed centrifugal stirrer to obtain a mixture with a mass ratio of 1:1000 of a mixed solution;
step three: and (3) setting the mass ratio in the step two as 1:1000 of the mixed solution is added into a pulping machine for processing for 2 to 3 hours, the power of the pulping machine is 90kw, and the full load operation is carried out, so that paper pulp with the size of 0.1mm is obtained;
step four: performing two-stage deslagging treatment through a deslagging machine in the third step, and specifically dividing the treatment into two stages;
stage one, introducing paper pulp into a slag remover, performing primary treatment under the pressure of 1.5-2kg/pa, and performing slag removal treatment in stage two if pulp lumps after slag removal are smaller than 1mm, and if the pulp lumps are smaller than 1mm, directly entering a pulp storage tank, and if the pulp lumps are larger than or equal to 1 mm;
stage two, the pulp mass which is processed in stage one and is larger than or equal to 1mm is processed in two stages, the pulp mass which is larger than or equal to 1mm is mainly filtered, the pressure of a slag remover is 0.5-1kg/pa, and the pulp mass which is smaller than 1mm is conveyed to a pulp storage tank;
step five: adding 5-10% of aramid paper recovered pulp and 90-95% of new pulp into each batch of base paper;
step six: adjusting the speed of a paper machine to 20-50m/min, and controlling the net surfing concentration to 0.1-10 per mill, and uniformly making paper by controlling the uniformity;
step seven: and drying the aramid paper prepared in the sixth step by a dryer.
3. The aramid paper re-papermaking method according to claim 1, characterized in that: in the step one, the paper shredder rotates at 180 r/min, the number of shredded paper is 10-15 sheets per time, the shredded paper is in a powder shape smaller than 0.5mm, and the retained paper scrap larger than 0.5mm is shredded for the second time.
4. The aramid paper re-papermaking method according to claim 1, characterized in that: and in the second step, the rotating speed of the high-speed centrifugal stirrer is 8000 revolutions per minute, the temperature is 25 ℃, and the pressure is 1.01 kpa.
5. The aramid paper backsheet method of claim 1, characterized in that: and in the seventh step, the drying environment of the dryer is a ventilating environment with the temperature of 50-80 ℃, and the uniform drying is carried out at the speed of 5 m/min.
6. The aramid paper backsheet method according to any one of claims 1 to 5, characterized in that: the method specifically comprises a back-making system process for back-making the aramid fiber paper.
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