CN113026408A - Paper-shredding pulping process for manufacturing grey-bottom white board paper core layer by using waste paper - Google Patents
Paper-shredding pulping process for manufacturing grey-bottom white board paper core layer by using waste paper Download PDFInfo
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- CN113026408A CN113026408A CN202110311705.5A CN202110311705A CN113026408A CN 113026408 A CN113026408 A CN 113026408A CN 202110311705 A CN202110311705 A CN 202110311705A CN 113026408 A CN113026408 A CN 113026408A
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- 239000010893 paper waste Substances 0.000 title claims abstract description 81
- 238000004537 pulping Methods 0.000 title claims abstract description 50
- 239000012792 core layer Substances 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 239000002002 slurry Substances 0.000 claims abstract description 140
- 239000000835 fiber Substances 0.000 claims abstract description 115
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000007864 aqueous solution Substances 0.000 claims abstract description 32
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 claims abstract description 24
- 238000012216 screening Methods 0.000 claims abstract description 17
- 239000004310 lactic acid Substances 0.000 claims abstract description 12
- 235000014655 lactic acid Nutrition 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 239000002893 slag Substances 0.000 claims abstract description 10
- 238000003860 storage Methods 0.000 claims abstract description 10
- 108090000790 Enzymes Proteins 0.000 claims description 30
- 102000004190 Enzymes Human genes 0.000 claims description 30
- 229940088598 enzyme Drugs 0.000 claims description 30
- 239000012670 alkaline solution Substances 0.000 claims description 17
- 239000003795 chemical substances by application Substances 0.000 claims description 17
- 239000002761 deinking Substances 0.000 claims description 17
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 16
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 claims description 12
- 108010059892 Cellulase Proteins 0.000 claims description 11
- 229940106157 cellulase Drugs 0.000 claims description 11
- 230000007935 neutral effect Effects 0.000 claims description 9
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 8
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 8
- CHHHXKFHOYLYRE-UHFFFAOYSA-M 2,4-Hexadienoic acid, potassium salt (1:1), (2E,4E)- Chemical compound [K+].CC=CC=CC([O-])=O CHHHXKFHOYLYRE-UHFFFAOYSA-M 0.000 claims description 6
- 108010059820 Polygalacturonase Proteins 0.000 claims description 6
- 239000003995 emulsifying agent Substances 0.000 claims description 6
- 108010093305 exopolygalacturonase Proteins 0.000 claims description 6
- 239000004302 potassium sorbate Substances 0.000 claims description 6
- 235000010241 potassium sorbate Nutrition 0.000 claims description 6
- 229940069338 potassium sorbate Drugs 0.000 claims description 6
- WHUUTDBJXJRKMK-UHFFFAOYSA-N Glutamic acid Natural products OC(=O)C(N)CCC(O)=O WHUUTDBJXJRKMK-UHFFFAOYSA-N 0.000 claims description 5
- 235000013922 glutamic acid Nutrition 0.000 claims description 5
- 239000004220 glutamic acid Substances 0.000 claims description 5
- 229940059442 hemicellulase Drugs 0.000 claims description 5
- 108010002430 hemicellulase Proteins 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims 1
- 238000004090 dissolution Methods 0.000 abstract description 5
- 230000002378 acidificating effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- 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
- D21B1/345—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
- D21C5/025—De-inking
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/005—Microorganisms or enzymes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Microbiology (AREA)
- Paper (AREA)
Abstract
The invention discloses a paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper, which comprises the following steps: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp; screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage; and discharging the long fiber concentrated slurry from the pulp tower, mixing the long fiber concentrated slurry and the short fiber concentrated slurry to obtain core layer slurry, and preparing the core layer of the grey-bottom white board. According to the invention, the lactic acid aqueous solution and the acetic acid aqueous solution are added into the pulper in sections, so that the dissolving speed of the waste paper can be increased, and the complete dissolution of the waste paper is facilitated.
Description
Technical Field
The invention relates to the technical field of papermaking. More particularly, the invention relates to a paper-shredding pulping process for manufacturing a core layer of grey white board paper by using waste paper.
Background
The coated grey white board is a middle-grade packaging paper, which is an important component of the packaging paper. In recent years, in order to respond to the national call for energy conservation and emission reduction, ecological environment protection and sustainable development realization, waste paper is mainly used as a raw material in the pulping and papermaking process of grey-bottom white board paper, so that the enterprise cost can be obviously reduced, the damage of the waste paper to the environment can be reduced, and auxiliary materials which are produced in other industries and can be used for papermaking can be recycled. The coated grey white board is a processed board which is made by coating white paint on an original board and then carrying out finishing processing, and is one of the most common packaging materials in China at present. However, in the process of processing waste paper, the waste paper is often not dissolved quickly, resulting in an increase in the time for processing waste paper.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide a process for pulping shredded paper for producing a core layer of grey white board from waste paper, wherein the dissolution rate of the waste paper is increased and the processing time of the waste paper is shortened by treating the waste paper with an aqueous solution of lactic acid and an aqueous solution of acetic acid.
To achieve these objects and other advantages in accordance with the present invention, there is provided a process for pulping shredded paper for producing a core layer of grey board paper from used paper, comprising the steps of:
decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: the waste paper is scattered by a bale breaker, the waste paper is sent into a pulper, 5-8 g/L of lactic acid aqueous solution is added into the pulper at the speed of one thousandth of the volume of the pulper per minute, half an hour is added, 15-20 g/L of acetic acid aqueous solution is added into the pulper at the speed of one thousandth of the volume of the pulper per minute, half an hour is added, pulping enzyme is added, an alkaline solution is used for adjusting the pH value to be neutral, then a high-frequency fluffer is used for fluffing, and a deinking agent is added.
Preferably, the pulping enzyme consists of 5-10 parts of cellulase, 15-20 parts of acidic xylanase, 5-8 parts of pectinase and 1-2 parts of potassium sorbate by mass.
Preferably, the pulping enzyme consists of 20-25 parts of xylanase, 10-15 parts of hemicellulase, 15-20 parts of cellulase, 15-20 parts of glutamic acid and 1-2 parts of emulsifier by mass.
Preferably, the alkaline solution is a 3% sodium bicarbonate aqueous solution by mass fraction.
Preferably, the addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
Preferably, the deinking agent is added in an amount of 0.1% by weight of the waste paper.
The invention at least comprises the following beneficial effects: lactic acid aqueous solution and acetic acid aqueous solution are added into the pulper in sections, so that the dissolving speed of the waste paper can be increased, and the complete dissolution of the waste paper is facilitated;
potassium sorbate is added into pulping enzyme, so that the polymerization speed of the short fibers can be accelerated, and the strength of the short fibers is improved;
the emulsifier is added into the pulping enzyme, so that xylanase and the like can be rapidly dispersed, the short fiber polymerization speed is accelerated, the short fiber lightness is improved, and the interior of the fiber is loose.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Detailed Description
The present invention is further described in detail below with reference to examples so that those skilled in the art can practice the invention with reference to the description.
It is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified.
< example 1>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 5g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 20g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 5 parts of cellulase, 20 parts of acidic xylanase, 5 parts of pectinase and 2 parts of potassium sorbate.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< example 2>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 8g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 15g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 10 parts of cellulase, 15 parts of acidic xylanase, 8 parts of pectinase and 1 part of potassium sorbate.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< example 3>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 6g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 17g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 8 parts of cellulase, 17 parts of acidic xylanase, 6 parts of pectinase and 2 parts of potassium sorbate.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< example 4>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 6g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 19g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 20 parts of xylanase, 15 parts of hemicellulase, 15 parts of cellulase, 20 parts of glutamic acid and 1 part of emulsifier in parts by mass.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< example 5>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 7g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 17g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 25 parts of xylanase, 10 parts of hemicellulase, 20 parts of cellulase, 15 parts of glutamic acid and 1 part of emulsifier in parts by mass.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< example 6>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding 8g/L of lactic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding 16g/L of acetic acid aqueous solution into the pulper at the speed of one thousandth of the volume of the pulper per minute, adding half an hour, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 22 parts of xylanase, 13 parts of hemicellulase, 18 parts of cellulase, 16 parts of glutamic acid and 1 part of emulsifier in parts by mass.
The alkaline solution is a sodium bicarbonate aqueous solution with the mass fraction of 3%.
The addition amount of the pulping enzyme is 1 percent of the weight of the waste paper.
The addition amount of the deinking agent is 0.1 percent of the weight of the waste paper.
< comparative example 1>
A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper comprises the following steps:
dissolving: decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening: screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
papermaking: discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: breaking up waste paper by a bale breaker, sending the waste paper into a pulper, adding hydrochloric acid solution into the pulper, adding pulping enzyme, adjusting the pH value to be neutral by using alkaline solution, then carrying out defibering by using a high-frequency defibering machine, and adding a deinking agent.
The pulping enzyme consists of 10 parts of cellulase, 15 parts of acidic xylanase and 8 parts of pectinase in parts by mass.
< measurement of paper dissolving time >
The dissolution times of the wastepapers of examples 1 to 6 and comparative example 1 were recorded, and the results are shown in the following table.
| Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | |
| Time to dissolve paper | 3h | 3.5h | 4h | 3.5h | 3.5h | 5h |
As can be seen from the above table, the paper dissolving speed of the examples 1 to 6 is higher than that of the comparative example 1, and the lactic acid aqueous solution and the acetic acid aqueous solution are added into the pulper in sections, so that the dissolving speed of the waste paper can be increased, and the complete dissolution of the waste paper is facilitated.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable to various fields of endeavor for which the invention may be embodied with additional modifications as would be readily apparent to those skilled in the art, and the invention is therefore not limited to the details given herein and to the embodiments shown and described without departing from the generic concept as defined by the claims and their equivalents.
Claims (6)
1. A paper-shredding pulping process for manufacturing an ash-bottom white board paper core layer by using waste paper is characterized by comprising the following steps:
decomposing the waste paper into pulp, and deslagging the pulp to obtain slag-free pulp;
screening the slag-free slurry into long fiber slurry and short fiber slurry, respectively carrying out slag removal and concentration treatment on the long fiber slurry and the short fiber slurry to obtain long fiber concentrated slurry and short fiber concentrated slurry, and then respectively transferring the long fiber concentrated slurry and the short fiber concentrated slurry into a slurry tower for storage;
discharging long fiber concentrated slurry from the pulp tower and mixing the long fiber concentrated slurry with short fiber concentrated slurry to obtain core layer slurry, and preparing a core layer of the grey-bottom white board;
the specific process of decomposing waste paper into pulp comprises the following steps: the waste paper is scattered by a bale breaker, the waste paper is sent into a pulper, 5-8 g/L of lactic acid aqueous solution is added into the pulper at the speed of one thousandth of the volume of the pulper per minute, half an hour is added, 15-20 g/L of acetic acid aqueous solution is added into the pulper at the speed of one thousandth of the volume of the pulper per minute, half an hour is added, pulping enzyme is added, an alkaline solution is used for adjusting the pH value to be neutral, then a high-frequency fluffer is used for fluffing, and a deinking agent is added.
2. The process of pulping paper shreds for producing an ash-based white board core layer from waste paper according to claim 1, wherein the pulping enzyme comprises 5 to 10 parts by weight of cellulase, 15 to 20 parts by weight of acid xylanase, 5 to 8 parts by weight of pectinase and 1 to 2 parts by weight of potassium sorbate.
3. The process of pulping paper shreds for producing an ash-based white board core layer from waste paper according to claim 1, wherein the pulping enzyme comprises 20 to 25 parts by weight of xylanase, 10 to 15 parts by weight of hemicellulase, 15 to 20 parts by weight of cellulase, 15 to 20 parts by weight of glutamic acid, and 1 to 2 parts by weight of emulsifier.
4. The process of pulping shredded paper for producing an ash-backed white board core layer from waste paper according to claim 1, wherein the alkaline solution is an aqueous solution of sodium bicarbonate with a mass fraction of 3%.
5. The process for pulping of shredded paper for the production of a core layer of grey white board paper from used paper according to claim 1, wherein the amount of the pulping enzyme added is 1% by weight of the used paper.
6. The process of pulping shredded paper for the production of a core layer of grey board paper from used paper according to claim 1, wherein the deinking agent is added in an amount of 0.1% by weight of the used paper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311705.5A CN113026408A (en) | 2021-03-24 | 2021-03-24 | Paper-shredding pulping process for manufacturing grey-bottom white board paper core layer by using waste paper |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110311705.5A CN113026408A (en) | 2021-03-24 | 2021-03-24 | Paper-shredding pulping process for manufacturing grey-bottom white board paper core layer by using waste paper |
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| Publication Number | Publication Date |
|---|---|
| CN113026408A true CN113026408A (en) | 2021-06-25 |
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| CN202110311705.5A Pending CN113026408A (en) | 2021-03-24 | 2021-03-24 | Paper-shredding pulping process for manufacturing grey-bottom white board paper core layer by using waste paper |
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| CN103898790A (en) * | 2012-12-27 | 2014-07-02 | 东莞市绿微康生物科技有限公司 | Beating enzyme preparation, and preparation method and application thereof |
| CN107401078A (en) * | 2017-09-01 | 2017-11-28 | 玖龙纸业（太仓）有限公司 | A kind of process units and production method of coated duplex board with grey back and Cultural Paper |
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| CN103898790A (en) * | 2012-12-27 | 2014-07-02 | 东莞市绿微康生物科技有限公司 | Beating enzyme preparation, and preparation method and application thereof |
| CN107401078A (en) * | 2017-09-01 | 2017-11-28 | 玖龙纸业（太仓）有限公司 | A kind of process units and production method of coated duplex board with grey back and Cultural Paper |
| CN108035190A (en) * | 2017-11-12 | 2018-05-15 | 福建省晋江优兰发纸业有限公司 | A kind of high humility waste paper manufactures reel copy paper method |
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Application publication date: 20210625 |