CN112411259A - Method for improving folding resistance of packaging paper - Google Patents

Method for improving folding resistance of packaging paper Download PDF

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Publication number
CN112411259A
CN112411259A CN202011278296.5A CN202011278296A CN112411259A CN 112411259 A CN112411259 A CN 112411259A CN 202011278296 A CN202011278296 A CN 202011278296A CN 112411259 A CN112411259 A CN 112411259A
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Prior art keywords
sizing
paper
improving
styrene
agent
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CN202011278296.5A
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Chinese (zh)
Inventor
王东兴
许慧敏
慈晓雷
邵光运
贾文玲
***
于娟娟
张勇峰
刘春兰
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Shandong Century Sunshine Paper Group Co ltd
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Shandong Century Sunshine Paper Group Co ltd
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Priority to CN202011278296.5A priority Critical patent/CN112411259A/en
Publication of CN112411259A publication Critical patent/CN112411259A/en
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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
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/10—Packing paper
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D21H17/28—Starch
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • 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
    • D21H17/20—Macromolecular organic compounds
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/10—Coatings without pigments
    • 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
    • D21H21/00—Non-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
    • D21H21/14—Non-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
    • D21H21/16—Sizing or water-repelling agents
    • 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
    • D21H21/00—Non-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
    • D21H21/14—Non-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
    • D21H21/18—Reinforcing agents

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Paper (AREA)

Abstract

The invention relates to a method for improving the folding resistance of packaging paper, which comprises the step of adding a reinforcing auxiliary agent into a film transfer sizing agent, wherein the reinforcing auxiliary agent is modified high-molecular multi-branched amphoteric polyacrylamide and a cationic high-specific surface area styrene-acrylic surface sizing agent, the molecular weight of the modified high-molecular multi-branched amphoteric polyacrylamide is 100-500 ten thousand, and the particle size of the cationic high-specific surface area styrene-acrylic surface sizing agent is 50-100 micrometers. The method for improving the folding resistance of the packaging paper can improve the folding resistance of the packaging base paper at low cost, reduce the dependence of domestic packaging paper on imported waste paper pulp, and better adapt to the production requirement of lightweight cartons.

Description

Method for improving folding resistance of packaging paper
Technical Field
The invention relates to a method for improving the folding resistance of packaging paper, in particular to a method for improving the folding resistance of packaging base paper by coating a specific reinforcing auxiliary agent in a film transfer gluing mode.
Background
Since 2017, the national environmental protection ministry released the regulations on the environmental protection of solid wastes which can be used as raw materials for restricting import, the environment protection situation of domestic papermaking becomes increasingly severe, and the number of environmental protection certificates for import of foreign wastes is sharply reduced. Meanwhile, the domestic waste paper raw materials are not unified in classification and sorting standards, so that the problems of serious keratinization, short fiber, low fiber strength and the like are generally solved due to the repeated recycling of domestic waste paper besides the problem of generally high impurity content. In addition, the trend of the development of the domestic packaging industry towards light weight is increasingly obvious; in order to solve the section problem caused by poor folding resistance of the domestic packaging paper box due to the two reasons, the prior art mainly relies on imported and applied waste paper pulp with higher price to deal with the problem, so that the domestic packaging paper has high production cost and low market competitiveness, and the prior art puts forward higher requirements on the improvement of the folding resistance of the base paper in the packaging industry.
According to the invention, the specific enhancement auxiliary agent is added into the surface sizing starch solution, and the surface sizing starch solution is coated on the surface of the base paper in a film transfer sizing mode to improve the film forming strength of starch, improve the folding resistance of the base paper and solve the problem of the section of a subsequent packaging carton at low cost.
Disclosure of Invention
The invention provides a method for effectively improving the folding resistance with low cost aiming at the problem of section caused by poor folding resistance of the existing domestic packaging paper box.
The method for improving the folding resistance of the packaging paper comprises the step of adding a reinforcing auxiliary agent into a film transfer sizing agent, wherein the reinforcing auxiliary agent is modified high-molecular multi-branched amphoteric polyacrylamide and a cationic high-specific-surface-area styrene-acrylic surface sizing agent, the molecular weight of the modified high-molecular multi-branched amphoteric polyacrylamide is 100-500 ten thousand, and the particle size of the cationic high-specific-surface-area styrene-acrylic surface sizing agent is 50-100 micrometers.
According to the method for improving the folding resistance of the packaging paper, the reinforcing auxiliary agent is preferably selected from the group consisting of a reinforcing auxiliary agent and a film transfer sizing agent in a mass ratio of 1: 50-1: a ratio of 100 was added to the film transfer sizing solution.
According to the method for improving the folding resistance of the packaging paper, the ratio of the modified high-molecular multi-branched amphoteric polyacrylamide to the cationic high-specific surface area styrene-acrylic surface sizing agent in the reinforcing aid is preferably 1: 2-1: 4.
the method of improving the folding endurance of the wrapping paper of the present invention preferably comprises the steps of:
(1) preparing corn native starch and clear water into native starch emulsion with the mass fraction of 20% -25% in a cooking pot, adding amylase into the native starch emulsion, and cooking and pasting the starch emulsion by using steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10-12% by using warm water;
(3) diluting the modified high-molecular multi-branched amphoteric polyacrylamide by using clear water by 5-6 times by using dilution equipment, and adding the diluted starch emulsion; then the cationic high specific surface area styrene-acrylic surface sizing agent is matched with the cationic high specific surface area styrene-acrylic surface sizing agent;
(4) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller through a sizing rod, and transferring the sizing solution to the surface of a paper sheet to finish the sizing of the transfer surface of the film;
(5) after the paper is sized and coated, the paper is subjected to subsequent procedures of drying, press polishing, reeling, rewinding and the like to complete the papermaking of the paper.
The method for improving the folding resistance of the packaging paper preferably comprises the step (1) that the addition amount of the amylase in every 1000kg of oven-dried starch is 40ML, and the temperature of the introduced steam is 160-200 ℃.
The method for improving the folding endurance of the packing paper of the present invention preferably has the warm water temperature of 60-70 ℃ in the step (2).
The method for improving the folding resistance of the packing paper preferably uses a BTG25# sizing rod, a BTG50# sizing rod or a Vimide VRM30# sizing rod or a Vimide VRM40# sizing rod, the coating weight is 1-2.5g, and the sizing pressure is 10-25 KN/m.
Another aspect of the present invention is also directed to a wrapper paper made by the aforementioned method of improving the folding endurance of a wrapper paper.
The method for improving the folding resistance of the packaging paper can improve the folding resistance of the packaging base paper at low cost, reduce the dependence of domestic packaging paper on imported waste paper pulp, and better adapt to the production requirement of lightweight cartons.
Drawings
FIG. 1 is an infrared spectrum of a modified high-molecular multi-branched amphoteric polyacrylamide used in the examples.
FIG. 2 is an infrared spectrum of the cationic high specific surface area styrene-acrylic surface sizing agent used in the examples.
Detailed Description
To better illustrate the present invention, the following examples are given to provide a clear and complete description of the method of making the high flex paper of the present invention.
Example 1
(1) Preparing 20% of native starch emulsion from corn native starch and clear water in a cooking pot, adding 40ml of amylase into every 1000kg of oven-dried starch, and cooking and pasting the starch emulsion by using 180 ℃ steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10% by using warm water at 65 ℃;
(3) diluting modified high-molecular multi-branched amphoteric polyacrylamide (SK 108 produced by Astro Fine chemical Co., Ltd., molecular weight of 100-500 ten thousand) by 5 times with clear water by using a diluting device, and adding the diluted starch emulsion into the (2), wherein the mass ratio of the SK108 to the starch emulsion is 1: 60;
(4) adding styrene-acrylic cationic sizing agent ES-B stock solution (with the particle size of 50-100 microns) produced by Huayan chemical engineering Co., Ltd. in Zhejiang province into an inlet pipeline of a screw pump in the step (5), wherein the mass ratio of the ES-B to the starch emulsion is 1: 200;
(5) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller by using a BTG25# and a BTG50# sizing rod, and then transferring the sizing solution to the surface of a paper sheet to finish the surface sizing of the film transfer, wherein the coating weight is 2.5g, and the sizing pressure is 10 Kn/m;
(6) and (3) after the paper is coated by sizing, performing subsequent drying, press polishing, reeling, rewinding and other processes on the paper to complete the papermaking of the white craft paper.
(7) A three-screen-stacking multi-cylinder production process is adopted, soft calendering is prepared in the production process, and the main control parameters are as follows: firstly, controlling the press line pressure to be 80-220 KN/m; secondly, a multi-cylinder drying process ensures slow drying and reduces the shrinkage rate in the base paper drying process, the temperature of a high-temperature cylinder is controlled at 110 ℃ and 130 ℃, and the moisture after drying is less than or equal to 8 percent; thirdly, the temperature of hot oil of the calender is controlled to be 180-200 ℃.
The detected quantitative amount of the white craft paper is 140g/m2The folding resistance is 29 times, and the breaking resistance is 2.79Kpa.m2G, interlayer bonding 251J/m2The ring crush is 8.1N.m/g, the ink absorption is 31.7%, the whiteness is 80.3%, and the water content is 7.5%.
Example 2
(1) Preparing 20% of native starch emulsion from corn native starch and clear water in a cooking pot, adding 40ml of amylase into every 1000kg of oven-dried starch, and cooking and pasting the starch emulsion by using 180 ℃ steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10% by using warm water at 65 ℃;
(3) diluting modified high-molecular multi-branched amphoteric polyacrylamide (SK 108 produced by Astro Fine chemical Co., Ltd., molecular weight of 100-500 ten thousand) by 5 times with clear water by using a diluting device, and adding the diluted starch emulsion into the (2), wherein the mass ratio of the SK108 to the starch emulsion is 1: 80;
(4) adding styrene-acrylic cationic sizing agent ES-B stock solution (with the particle size of 50-100 microns) produced by a screw pump Zhejiang Huayan chemical engineering Co., Ltd into the inlet pipeline of the screw pump in the step (5), wherein the mass ratio of the ES-B to the starch emulsion is 1: 200;
(5) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller by using a BTG25# and a BTG50# sizing rod, and then transferring the sizing solution to the surface of a paper sheet to finish the surface sizing of the film transfer, wherein the coating weight is 2.5g, and the sizing pressure is 10 Kn/m;
(6) and (3) after the paper is coated by sizing, performing subsequent drying, press polishing, reeling, rewinding and other processes on the paper to complete the papermaking of the white craft paper.
(7) A three-screen-stacking multi-cylinder production process is adopted, soft calendering is prepared in the production process, and the main control parameters are as follows: firstly, controlling the press line pressure to be 80-220 KN/m; secondly, a multi-cylinder drying process ensures slow drying and reduces the shrinkage rate in the base paper drying process, the temperature of a high-temperature cylinder is controlled at 110 ℃ and 130 ℃, and the moisture after drying is less than or equal to 8 percent; thirdly, the temperature of hot oil of the calender is controlled to be 180-200 ℃.
The detected quantitative amount of the white craft paper is 141g/m2The folding resistance is 28 times, and the breaking resistance is 2.77Kpa.m2(g), interlayer bonding 249J/m2The ring crush is 8.0N.m/g, the ink absorption is 31.6%, the whiteness is 80.2%, and the water content is 7.5%.
Example 3
(1) Preparing 20% of native starch emulsion from corn native starch and clear water in a cooking pot, adding 40ml of amylase into every 1000kg of oven-dried starch, and cooking and pasting the starch emulsion by using 180 ℃ steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10% by using warm water at 65 ℃;
(3) diluting modified high-molecular multi-branched amphoteric polyacrylamide (SK 108 produced by Astro Fine chemical Co., Ltd., molecular weight of 100-500 ten thousand) by 5 times with clear water by using a diluting device, and adding the diluted starch emulsion into the (2), wherein the mass ratio of the SK108 to the starch emulsion is 1: 100;
(4) adding styrene-acrylic cationic sizing agent ES-B stock solution (with the particle size of 50-100 microns) produced by a screw pump Zhejiang Huayan chemical engineering Co., Ltd into the inlet pipeline of the screw pump in the step (5), wherein the mass ratio of the ES-B to the starch emulsion is 1: 200;
(5) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller by using a BTG25# and a BTG50# sizing rod, and then transferring the sizing solution to the surface of a paper sheet to finish the surface sizing of the film transfer, wherein the coating weight is 2.5g, and the sizing pressure is 10 Kn/m;
(6) and (3) after the paper is coated by sizing, performing subsequent drying, press polishing, reeling, rewinding and other processes on the paper to complete the papermaking of the white craft paper.
(7) A three-screen-stacking multi-cylinder production process is adopted, soft calendering is prepared in the production process, and the main control parameters are as follows: firstly, controlling the press line pressure to be 80-220 KN/m; secondly, a multi-cylinder drying process ensures slow drying and reduces the shrinkage rate in the base paper drying process, the temperature of a high-temperature cylinder is controlled at 110 ℃ and 130 ℃, and the moisture after drying is less than or equal to 8 percent; thirdly, the temperature of hot oil of the calender is controlled to be 180-200 ℃.
The detected quantitative amount of the white craft paper is 142g/m2The folding resistance is 27 times, and the breaking resistance is 2.79Kpa.m2G, interlayer bonding 252J/m2The ring crush is 8.1N.m/g, the ink absorption is 31.7%, the whiteness is 80.3%, and the water content is 7.5%.
Comparative example 1
(1) Preparing 20% of native starch emulsion from corn native starch and clear water in a cooking pot, adding 40ml of amylase into every 1000kg of oven-dried starch, and cooking and pasting the starch emulsion by using 180 ℃ steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10% by using warm water at 65 ℃;
(3) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller by using a BTG25# and a BTG50# sizing rod, and then transferring the sizing solution to the surface of a paper sheet to finish the surface sizing of the film transfer, wherein the coating weight is 2.5g, and the sizing pressure is 10 Kn/m;
(4) and (3) after the paper is coated by sizing, performing subsequent drying, press polishing, reeling, rewinding and other processes on the paper to complete the papermaking of the white craft paper.
(5) A three-screen-stacking multi-cylinder production process is adopted, soft calendering is prepared in the production process, and the main control parameters are as follows: firstly, controlling the press line pressure to be 80-220 KN/m; secondly, a multi-cylinder drying process ensures slow drying and reduces the shrinkage rate in the base paper drying process, the temperature of a high-temperature cylinder is controlled at 110 ℃ and 130 ℃, and the moisture after drying is less than or equal to 8 percent; thirdly, the temperature of hot oil of the calender is controlled to be 180-200 ℃.
The detected quantitative amount of the white craft paper is 140g/m2The folding resistance is 23 times, and the breaking resistance is 2.70Kpa.m2Per g, interlayer bonding 244J/m2The ring crush is 8.0N.m/g, the ink absorption is 31.6%, the whiteness is 80.0%, and the water content is 7.5%.
TABLE 1 evaluation of white top kraft paper Performance of examples 1-3 and comparative example 1
Item Example 1 Example 2 Example 3 Comparative example 1
Quantification of 140g/m2 141g/m2 142g/m2 140g/m2
Moisture content 7.5％ 7.5％ 7.5％ 7.5％
Whiteness degree 80.3％ 80.2％ 80.3％ 80.0％
Resistant to breakage 2.79Kpa.m2/g 2.77Kpa.m2/g 2.79Kpa.m2/g 2.7Kpa.m2/g
Folding endurance 29 times (twice) 28 times of 27 times of 23 times of
Interlayer bonding 251J/m2 249J/m2 252J/m2 244J/m2
Ring pressure 8.1N.m/g 8.0N.m/g 8.1N.m/g 8.0N.m/g
Ink absorption 31.7％ 31.6％ 31.7％ 31.6％
As can be seen from the above table, the solid content of the starch solution is 10%, and the white top craft paper prepared in the examples 1-3 added with the polyacrylamide and the styrene-acrylic surface sizing agent in specific proportions has obviously better performance than the comparative example 1, the folding resistance of the white top paper of the comparative example 1 is 23 times, the folding resistance of the white top craft paper of the examples 1-3 is more than 27 times, and the white top craft paper is also obviously better than the comparative example 1 in other performances such as burst resistance, ring crush resistance, interlayer combination and the like, wherein the comprehensive performance of the white top craft paper of the example 1 is optimal.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It should be understood by those skilled in the art that the scope of the present invention is defined by the appended claims.

Claims (8)

1. A method for improving the folding resistance of wrapping paper comprises the step of adding a reinforcing auxiliary agent into a film transfer sizing agent, wherein the reinforcing auxiliary agent is modified high-molecular multi-branched amphoteric polyacrylamide and a cationic high-specific-surface-area styrene-acrylic surface sizing agent, the molecular weight of the modified high-molecular multi-branched amphoteric polyacrylamide is 100-500 ten thousand, and the particle size of the cationic high-specific-surface-area styrene-acrylic surface sizing agent is 50-100 micrometers.
2. A method of improving the crease resistance of a wrapper according to claim 1, wherein said enhancement aid is applied to the wrapper in a mass ratio to the film transfer size of 1: 50-1: a ratio of 100 was added to the film transfer sizing solution.
3. The method for improving the folding endurance of wrapping paper according to claim 2, wherein the ratio of the modified high molecular multi-branched amphoteric polyacrylamide to the cationic high specific surface area styrene-acrylic surface sizing agent in the enhancing additive is 1: 2-1: 4.
4. a method of improving the folding endurance of a wrapper according to any one of claims 1 to 3, comprising the steps of:
(1) preparing corn native starch and clear water into native starch emulsion with the mass fraction of 20% -25% in a cooking pot, adding amylase into the native starch emulsion, and cooking and pasting the starch emulsion by using steam;
(2) diluting the gelatinized starch emulsion to a mass concentration of 10-12% by using warm water;
(3) diluting the modified high-molecular multi-branched amphoteric polyacrylamide by using clear water by 5-6 times by using dilution equipment, and adding the diluted starch emulsion; then the cationic high specific surface area styrene-acrylic surface sizing agent is matched with the cationic high specific surface area styrene-acrylic surface sizing agent;
(4) conveying the prepared sizing solution to a sizing roller by using a screw pump, uniformly distributing the sizing solution on the sizing roller through a sizing rod, and transferring the sizing solution to the surface of a paper sheet to finish the sizing of the transfer surface of the film;
(5) after the paper is sized and coated, the paper is subjected to subsequent procedures of drying, press polishing, reeling, rewinding and the like to complete the papermaking of the paper.
5. The method for improving the folding endurance of a packing paper as claimed in claim 4, wherein the amount of amylase added in step (1) is 40ML per 1000kg of oven dried starch, and the temperature of steam passing through is 160-200 ℃.
6. The method for improving the folding endurance of a wrapping paper according to claim 4, wherein said warm water temperature in step (2) is 60-70 ℃.
7. A method of improving the folding endurance of a wrapper according to claim 4, wherein the metering rod used is BTG25# sizing rod, BTG50# sizing rod or Vimidd VRM30# sizing rod, Vimidd VRM40# sizing rod, the coating weight is 1-2.5g, and the sizing pressure is 10-25 KN/m.
8. A wrapper made by the method of improving the folding endurance of a wrapper of any of claims 1-7.
CN202011278296.5A 2020-11-16 2020-11-16 Method for improving folding resistance of packaging paper Pending CN112411259A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003278094A (en) * 2002-03-20 2003-10-02 Nippon Paper Industries Co Ltd Paper containing paper strengthening agent composed of amphoteric polyacrylamide
CN103572655A (en) * 2012-07-18 2014-02-12 荒川化学工业株式会社 Sizing performance appearing active agent, papermaking sizing agent, paper using the same and papermaking method
CN105586805A (en) * 2014-10-20 2016-05-18 东升新材料（山东）有限公司 Paper fold-resistance reinforcing agent and preparation method thereof
CN107663813A (en) * 2016-07-29 2018-02-06 华南理工大学 A kind of damp-prrof packing paper and compound glue application solution and their preparation method

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003278094A (en) * 2002-03-20 2003-10-02 Nippon Paper Industries Co Ltd Paper containing paper strengthening agent composed of amphoteric polyacrylamide
CN103572655A (en) * 2012-07-18 2014-02-12 荒川化学工业株式会社 Sizing performance appearing active agent, papermaking sizing agent, paper using the same and papermaking method
CN105586805A (en) * 2014-10-20 2016-05-18 东升新材料（山东）有限公司 Paper fold-resistance reinforcing agent and preparation method thereof
CN107663813A (en) * 2016-07-29 2018-02-06 华南理工大学 A kind of damp-prrof packing paper and compound glue application solution and their preparation method

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Application publication date: 20210226