CN113106774A - Deinking recycling method applied to office waste paper - Google Patents

Deinking recycling method applied to office waste paper Download PDF

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Publication number
CN113106774A
CN113106774A CN202110428660.XA CN202110428660A CN113106774A CN 113106774 A CN113106774 A CN 113106774A CN 202110428660 A CN202110428660 A CN 202110428660A CN 113106774 A CN113106774 A CN 113106774A
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China
Prior art keywords
deinking
waste paper
paper
biological enzyme
pulp
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CN202110428660.XA
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Chinese (zh)
Inventor
许丛保
王宝辉
刘涛
杨家万
储德明
肖启飞
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Zhejiang Shanying Paper Industry Co Ltd
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Zhejiang Shanying Paper Industry Co Ltd
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Priority to CN202110428660.XA priority Critical patent/CN113106774A/en
Publication of CN113106774A publication Critical patent/CN113106774A/en
Pending legal-status Critical Current

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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H11/00Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
    • D21H11/14Secondary fibres
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30Defibrating by other means
    • D21B1/32Defibrating by other means of waste paper
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21BFIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00Fibrous raw materials or their mechanical treatment
    • D21B1/04Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
    • D21B1/12Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
    • D21B1/30Defibrating by other means
    • D21B1/34Kneading or mixing; Pulpers
    • D21B1/345Pulpers
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005Treatment of cellulose-containing material with microorganisms or enzymes
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21CPRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/02Working-up waste paper
    • D21C5/025De-inking
    • D21C5/027Chemicals therefor
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21HPULP 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
    • D21H21/00Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/16Sizing or water-repelling agents
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/64Paper recycling

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Mechanical Engineering (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Toxicology (AREA)
  • Paper (AREA)

Abstract

The invention belongs to the technical field of papermaking, and particularly relates to a deinking recycling method applied to office waste paper. Aiming at the problems of large use of forest resources, high energy consumption and high production cost caused by adopting wood pulp as a raw material in the prior art, the invention provides a deinking recycling method applied to office waste paper, which comprises the steps of taking waste paper printed with printing ink as a raw material, and adding the raw material into a hydrapulper for pulping; heating water in a hydrapulper to 35-55 ℃, adding a biological enzyme deinking complexing agent, and deinking for 60-120 min; removing residues and impurities by coarse screening after deinking to obtain waste paper recycling raw pulp; filtering and manufacturing the recovered raw pulp of the waste paper by a forming net part of a paper machine, squeezing, dehydrating and drying to obtain dry paper sheets; and drying, press polishing, reeling and rewinding to obtain finished paper. The invention utilizes the biological enzyme deinking complexing agent to deink the waste paper printed with the printing ink, such as office waste paper, and has better deinking effect, thereby ensuring that the prepared finished paper has higher whiteness.

Description

Deinking recycling method applied to office waste paper
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to a deinking recycling method applied to office waste paper.
Background
In modern commodity trade, the packaging material plays an important role in the preservation, beautification and protection of commodities, and the packaging paperboard accounts for about 37 percent of the world packaging material. The packaging board market has undergone great changes in the variety and product specifications in recent years, and the share of packaging boards produced from waste paper has increased gradually. The kraft liner board is one of the important constituent materials of the corrugated case, and requires good fiber bonding strength, flat paper surface, better tightness and stiffness and certain elasticity so as to ensure that the manufactured case has shockproof and pressure-resistant capabilities. In recent years, as the requirement for packaging quality is gradually increased, the packaging cartons for some high-grade commodities (such as high-grade wine, beverages and the like) gradually replace the original white kraft paperboard, natural color kraft paperboard and the like with white kraft paperboard produced from whole wood pulp, the development speed is high, and the demand is high. As domestic kraft liner board paper is developed rapidly for a long time, the domestic kraft liner board paper reaches a very large production scale, the competition among enterprises is extremely intense, and the requirements on the product are higher and higher along with the continuous improvement of the living standard of people, so that the kraft liner board paper is bound to be replaced by the product of the project to become a market leading product. In the market of white top kraft liner board, high-grade products are mainly foreign brands such as American Simpson, China pine, Huihao brand and Japanese prince, and domestic administrative paper industry, Jiu Longyan paper industry and Jingxing paper industry have a small amount of production, but the product index strength, the pressure resistance and the paper surface defect cause that printing dots are not practical and the like and can not meet the customer demand, along with the improvement of the demand of the national cultural standard, the social requirements on the strength and the printing of the product can be continuously improved, and the market potential of the product is larger.
In the prior art, wood pulp is mostly adopted as a raw material when the white top kraft liner board is produced, so that a great deal of forest resources are used, the energy consumption is high, and the production cost is high.
In order to solve this problem, research and study have been conducted in long-term production and living practices, for example, chinese patent application discloses an environmental-friendly waste paper deinking method [ application No.: 201510494991.8], the invention patent application comprises the steps of: (1) putting the waste paper into a collecting frame, putting the collecting frame into a washing tank, and vibrating the collecting frame up and down for primary cleaning; (2) carrying out vacuum stirring and crushing on the waste paper after primary cleaning, wherein the mass concentration of waste paper pulp is 20-25%, adding pectinase and amylase at the temperature of 45-55 ℃ in the crushing process, and the adding amount of the pectinase and the amylase is 0.01-0.02% of the absolute dry weight of the waste paper; (3) performing gradient centrifugation on the crushed waste paper to further remove impurities in the waste paper; (4) loading the centrifuged waste paper pulp into a non-woven bag, adding water at the frequency of 40-50 KHz, carrying out ultrasonic crushing for 25-30 minutes, adding lipase and laccase into the water at the temperature of 35-40 ℃, wherein the accommodation volume of the non-woven bag is not less than that of an ultrasonic machine; (5) flotation deinking is carried out on the waste paper pulp after ultrasonic treatment; (6) the waste paper pulp is repeatedly added with water, stirred, centrifuged and washed.
The invention patent application replaces partial wood pulp by deinking and recycling office waste paper, saves forest resources, but the deinking effect of the office waste paper is still to be improved.
Disclosure of Invention
The invention aims to solve the problems and provide a deinking recycling method which has good deinking effect and is applied to office waste paper.
A deinking recycling method applied to office waste paper comprises the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a pulp disintegrating device for pulping;
step two: adjusting the pulping temperature in the pulp pulping equipment to 35-55 ℃, adding a biological enzyme deinking complexing agent, and maintaining the pulping process for 15-45 min;
step three: removing residue, screening to remove impurities, flotation deinking, bleaching, and maintaining for 40-120min to obtain deinked recycled pulp;
step four: filtering the deinked recycled pulp obtained in the third step by a forming net part of a paper machine, papermaking, squeezing, dehydrating and drying to obtain dry paper;
or the deinked recycled pulp obtained in the third step is matched with waste paper pulp, wood pulp and bamboo pulp prepared in other technological processes according to any proportion, and then the paper is filtered and manufactured by a forming net part of a paper machine, squeezed, dehydrated and dried to obtain dry paper;
step five: the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, reeling and rewinding to obtain finished paper;
or the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, coating drying, reeling and rewinding to obtain a finished coated paper product.
In the deinking and recycling method applied to office waste paper, the addition amount of the biological enzyme deinking complexing agent is 0.1-0.6kg per ton of papermaking oven-dried pulp.
In the deinking and recycling method applied to office waste paper, the biological enzyme deinking complexing agent comprises a biological enzyme deinking agent and an auxiliary agent.
In the deinking reuse method applied to office waste paper described above, the auxiliary agent includes at least one of sodium bicarbonate, sodium dodecyl sulfate and sodium lignosulfonate.
In the above deinking reuse method applied to office waste paper, the auxiliary agent includes sodium bicarbonate, sodium lignin sulfonate and polyethylene glycol.
In the deinking and recycling method applied to office waste paper, the biological enzyme deinking complexing agent comprises 20-40 parts by weight of biological enzyme, 10-20 parts by weight of sodium bicarbonate, 0.5-2 parts by weight of polyethylene glycol and 5-15 parts by weight of sodium lignosulfonate.
In the deinking and recycling method applied to office waste paper, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme, 15 parts by weight of sodium bicarbonate, 1 part by weight of polyethylene glycol and 10 parts by weight of sodium lignosulfonate.
In the deinking recycling method applied to office waste paper, in the third step, the reinforcing agent and the intra-pulp water repellent agent are added into the deinked recycled pulp and uniformly mixed.
In the above deinking reuse method applied to office waste paper, the reinforcing agent includes polyacrylamide.
In the deinking reuse method applied to office waste paper described above, the intra-pulp water repellent agent includes dodecenyl succinic anhydride, zinc chloride, and polyamide epichlorohydrin resin.
Compared with the prior art, the invention has the advantages that:
1. the invention utilizes the biological enzyme deinking complexing agent to deink waste paper or waste paper pulp boards, such as office waste paper, and has better deinking effect, thereby ensuring that the prepared finished paper has higher whiteness.
2. The invention adds the pulp internal water-resisting agent, so that the finished paper has better water-resisting performance, and simultaneously adds the reinforcing agent, thereby improving the strength of the finished paper.
3. The method adopts a pressing process combining shoe pressing and gloss pressing in the pressing process, preferably adopts 2 shoe pressing and 1 gloss pressing, and adopts 1 gloss hard roller with a smooth surface and 1 shoe roller to cooperate to perform gloss pressing treatment on the surface of a paper sheet, so that the paper sheet has lower surface roughness; meanwhile, after paper sheets are dried to form a paperboard main body, first hard calendering processing is carried out, then a coating for reducing the surface roughness is coated on the surface of the paperboard main body, and then second calendering processing is carried out after coating and drying, soft calendering processing is preferably adopted in calendering, so that the surface roughness of the manufactured finished product paper is further reduced, the printability is high, and the requirements of users can be fully met.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments.
Example 1
The embodiment provides a deinking recycling method applied to office waste paper, which comprises the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a drum pulper for pulping;
step two: heating the pulping temperature in the drum pulper to 35 ℃, adding a biological enzyme deinking complexing agent, deinking for 60min, wherein the adding amount of the biological enzyme deinking complexing agent is 0.1kg per ton of papermaking oven-dried pulp;
step three: removing residues, screening, removing impurities, performing flotation deinking, bleaching, maintaining for 80min, adding a reinforcing agent and an in-pulp water repellent agent into the obtained pulp, and uniformly mixing to obtain deinked recycled pulp, wherein the addition amount of the reinforcing agent is 20kg per ton of papermaking oven-dried pulp, and the addition amount of the in-pulp water repellent agent is 80kg per ton of papermaking oven-dried pulp;
step four: filtering the deinked recycled pulp obtained in the third step by a forming net part of a paper machine, papermaking, squeezing, dehydrating and drying to obtain dry paper;
step five: the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, reeling and rewinding to obtain finished paper;
the biological enzyme deinking complexing agent comprises 40 parts by weight of biological enzyme, 10 parts by weight of sodium bicarbonate, 0.5 part by weight of polyethylene glycol and 5 parts by weight of sodium lignosulfonate, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Co., Ltd; the reinforcing agent comprises polyacrylamide; the water repellent agent in the slurry comprises 2 parts by mass of dodecenyl succinic anhydride, 20 parts by mass of zinc chloride and 40 parts by mass of polyamide epichlorohydrin resin.
Example 2
The embodiment provides a deinking recycling method applied to office waste paper, which comprises the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a drum pulper for pulping;
step two: heating the pulping temperature in the rotary drum pulper to 55 ℃, adding a biological enzyme deinking complexing agent, and deinking for 120min, wherein the adding amount of the biological enzyme deinking complexing agent is 0.6kg per ton of papermaking oven-dried pulp;
step three: removing residues, screening, removing impurities, performing flotation deinking, bleaching, maintaining for 80min, adding a reinforcing agent and an in-pulp water repellent agent into the obtained pulp, and uniformly mixing to obtain deinked recycled pulp, wherein the addition amount of the reinforcing agent is 60kg per ton of papermaking oven-dried pulp, and the addition amount of the in-pulp water repellent agent is 40kg per ton of papermaking oven-dried pulp;
step four: filtering the deinked recycled pulp obtained in the third step by a forming net part of a paper machine, papermaking, squeezing, dehydrating and drying to obtain dry paper;
step five: the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, reeling and rewinding to obtain finished paper;
wherein, the biological enzyme deinking complexing agent comprises 20 parts of biological enzyme, 20 parts of sodium bicarbonate, 2 parts of polyethylene glycol and 15 parts of sodium lignosulfonate respectively in parts by weight, and the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Limited company; the reinforcing agent comprises polyacrylamide; the water repellent agent in the slurry comprises 8 parts by mass of dodecenyl succinic anhydride, 10 parts by mass of zinc chloride and 20 parts by mass of polyamide epichlorohydrin resin.
Example 3
The embodiment provides a deinking recycling method applied to office waste paper, which comprises the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a drum pulper for pulping;
step two: heating the pulping temperature in the rotary drum pulper to 45 ℃, adding a biological enzyme deinking complexing agent, and deinking for 120min, wherein the adding amount of the biological enzyme deinking complexing agent is 0.35kg per ton of papermaking oven-dried pulp;
step three: removing residues, screening, removing impurities, performing flotation deinking, bleaching, maintaining for 80min, adding a reinforcing agent and an in-pulp water repellent agent into the obtained pulp, and uniformly mixing to obtain deinked recycled pulp, wherein the adding amount of the reinforcing agent is 40kg per ton of papermaking oven-dried pulp, and the adding amount of the in-pulp water repellent agent is 60kg per ton of papermaking oven-dried pulp;
step four: filtering the deinked recycled pulp obtained in the third step by a forming net part of a paper machine, papermaking, squeezing, dehydrating and drying to obtain dry paper;
step five: the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, reeling and rewinding to obtain finished paper;
wherein, the biological enzyme deinking complexing agent comprises 30 parts of biological enzyme, 15 parts of sodium bicarbonate, 1 part of polyethylene glycol and 10 parts of sodium lignosulfonate respectively in parts by weight, and the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Limited company; the reinforcing agent comprises polyacrylamide; the water repellent agent in the slurry comprises 5 parts by mass of dodecenyl succinic anhydride, 15 parts by mass of zinc chloride and 30 parts by mass of polyamide epichlorohydrin resin.
Example 4
This example provides a deinking recycling method for office waste paper, which has the same steps and components as those in example 3, except for the composition of the bio-enzyme deinking complexing agent.
Specifically, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme and 15 parts by weight of sodium bicarbonate, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Co.
Example 5
This example provides a deinking recycling method for office waste paper, which has the same steps and components as those in example 3, except for the composition of the bio-enzyme deinking complexing agent.
Specifically, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme and 10 parts by weight of sodium lignosulfonate, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Co.
Example 6
This example provides a deinking recycling method for office waste paper, which has the same steps and components as those in example 3, except for the composition of the bio-enzyme deinking complexing agent.
Specifically, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme and 10 parts by weight of sodium dodecyl sulfate, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Limited.
Example 7
This example provides a deinking recycling method for office waste paper, which has the same steps and components as those in example 3, except for the composition of the bio-enzyme deinking complexing agent.
Specifically, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme, 15 parts by weight of sodium bicarbonate and 10 parts by weight of sodium lignosulfonate, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Limited.
Example 8
The embodiment provides a deinking recycling method applied to office waste paper, which comprises the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a drum pulper for pulping;
step two: heating the pulping temperature in the rotary drum pulper to 45 ℃, adding a biological enzyme deinking complexing agent, and deinking for 120min, wherein the adding amount of the biological enzyme deinking complexing agent is 0.35kg per ton of papermaking oven-dried pulp;
step three: removing residues, screening, removing impurities, performing flotation deinking, bleaching, maintaining for 80min, adding a reinforcing agent and an in-pulp water repellent agent into the obtained pulp, and uniformly mixing to obtain deinked recycled pulp, wherein the adding amount of the reinforcing agent is 40kg per ton of papermaking oven-dried pulp, and the adding amount of the in-pulp water repellent agent is 60kg per ton of papermaking oven-dried pulp;
step four: mixing the deinked recycled pulp obtained in the third step with waste paper pulp, wood pulp and bamboo pulp prepared in other technological processes according to any proportion, filtering water by a forming net part of a paper machine, papermaking, squeezing for dehydration and drying to obtain dry paper sheets;
step five: the dry paper obtained in the fourth step is subjected to sizing, drying, press polishing, coating drying, reeling and rewinding to obtain a finished coated paper product;
in the embodiment, a pressing process combining shoe pressing and gloss pressing is adopted in the pressing and dewatering process, preferably 2 shoe pressing and 1 gloss pressing are adopted, and 1 gloss hard roller with a smooth surface is matched with 1 shoe roller to perform gloss pressing treatment on the surface of a paper sheet, so that the paper sheet has lower surface roughness; meanwhile, after paper sheets are dried to form a paperboard main body, first hard calendering processing is carried out, then a coating for reducing the surface roughness is coated on the surface of the paperboard main body, and then second calendering processing is carried out after coating and drying, soft calendering processing is preferably adopted in calendering, so that the surface roughness of the manufactured finished product paper is further reduced, the printability is high, and the requirements of users can be fully met.
Wherein, the biological enzyme deinking complexing agent comprises 30 parts of biological enzyme, 15 parts of sodium bicarbonate, 1 part of polyethylene glycol and 10 parts of sodium lignosulfonate respectively in parts by weight, and the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Limited company; the reinforcing agent comprises polyacrylamide; the water repellent agent in the slurry comprises 5 parts by mass of dodecenyl succinic anhydride, 15 parts by mass of zinc chloride and 30 parts by mass of polyamide epichlorohydrin resin.
Comparative example 1
The comparison example provides a deinking recycling method applied to office waste paper, and the specific steps and components are substantially the same as those of the example 3, and the difference is only in the composition of the biological enzyme deinking complexing agent.
Specifically, the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme, wherein the biological enzyme is an environment-friendly biological enzyme deinking agent produced by Shantai environmental protection science and technology (Shandong) Co.
Application example 1
Taking office waste paper of the same batch number, and dividing into 6 parts with equal mass;
finished paper 1 was prepared by the deinking reuse method for office waste paper described in example 3;
finished paper 2 was prepared by the deinking reuse method for office waste paper described in example 4;
finished paper 3 was obtained by the deinking reuse method for office waste paper described in example 5;
finished paper 4 was prepared by the deinking reuse method for office waste paper described in example 6;
finished paper 5 was prepared by the deinking reuse method for office waste paper described in example 7;
finished paper 6 was obtained by the deinking reuse method for office waste paper described in comparative example 1;
the finished papers 1-6 were tested for residual ink and whiteness, respectively, and the results are shown in the following table:
experimental project Residual ink (ppm) Whiteness (%)
Finished paper 1 120.95 81.50
Finished paper 2 181.25 75.36
Finished paper 3 176.33 76.23
Finished paper 4 177.12 76.02
Finished paper 5 167.27 78.31
Finished paper 6 300.87 53.32
And (4) analyzing results: from the above experimental data, it can be seen that the finished paper 1 has a lower residual ink value and a higher whiteness, thus achieving the intended purpose of the present invention.
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.

Claims (10)

1. A deinking recycling method applied to office waste paper is characterized by comprising the following steps:
the method comprises the following steps: adding waste paper or waste paper pulp boards serving as raw materials into a pulp disintegrating device for pulping;
step two: adjusting the pulping temperature in the pulp pulping equipment to 35-55 ℃, adding a biological enzyme deinking complexing agent, and deinking for 60-120 min;
step three: removing slag and impurities by coarse screening after deinking to obtain deinked recycled pulp;
step four: filtering the deinked recycled pulp obtained in the third step by a forming net part of a paper machine, papermaking, squeezing, dehydrating and drying to obtain dry paper;
step five: and D, sizing, drying, calendering, reeling and rewinding the dry paper obtained in the step four to obtain finished paper.
2. The deinking reuse method for office waste paper as claimed in claim 1, wherein: the addition amount of the biological enzyme deinking complexing agent is 0.1-0.6kg per ton of papermaking oven-dried pulp.
3. The deinking reuse method for office waste paper as claimed in claim 1, wherein: the biological enzyme deinking complexing agent comprises a biological enzyme deinking agent and an auxiliary agent.
4. The deinking reuse method for office waste paper as claimed in claim 3, wherein: the auxiliary reagent comprises at least one of sodium bicarbonate, sodium dodecyl sulfate and sodium lignosulfonate.
5. The deinking reuse method for office waste paper as claimed in claim 3, wherein: the auxiliary reagent comprises sodium bicarbonate, sodium lignosulfonate and polyethylene glycol.
6. The deinking reuse method for office waste paper as claimed in claim 5, wherein: the biological enzyme deinking complexing agent comprises 20-40 parts by weight of biological enzyme, 10-20 parts by weight of sodium bicarbonate, 0.5-2 parts by weight of polyethylene glycol and 5-15 parts by weight of sodium lignosulfonate.
7. The deinking reuse method for office waste paper as claimed in claim 6, wherein: the biological enzyme deinking complexing agent comprises 30 parts by weight of biological enzyme, 15 parts by weight of sodium bicarbonate, 1 part by weight of polyethylene glycol and 10 parts by weight of sodium lignosulfonate.
8. The deinking reuse method for office waste paper as claimed in claim 1, wherein: and step three, adding a reinforcing agent and an internal water repellent agent into the prepared deinking recycled pulp, and uniformly mixing.
9. The deinking reuse method for office waste paper as claimed in claim 8, wherein: the reinforcing agent comprises polyacrylamide.
10. The deinking reuse method for office waste paper as claimed in claim 8, wherein: the water repellent agent in the slurry comprises dodecenyl succinic anhydride, zinc chloride and polyamide epichlorohydrin resin.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113605136A (en) * 2021-08-18 2021-11-05 浙江金励环保纸业有限公司 Method for recycling waste paper pulp
CN115058909A (en) * 2022-06-28 2022-09-16 浙江山鹰纸业有限公司 Method for coating high-whiteness coated kraft liner paper repeatedly in low ration

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