CN110578263A - Production technology for improving wet tensile strength of wet-process paper - Google Patents
Production technology for improving wet tensile strength of wet-process paper Download PDFInfo
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- CN110578263A CN110578263A CN201910869394.7A CN201910869394A CN110578263A CN 110578263 A CN110578263 A CN 110578263A CN 201910869394 A CN201910869394 A CN 201910869394A CN 110578263 A CN110578263 A CN 110578263A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21D—TREATMENT OF THE MATERIALS BEFORE PASSING TO THE PAPER-MAKING MACHINE
- D21D1/00—Methods of beating or refining; Beaters of the Hollander type
- D21D1/02—Methods of beating; Beaters of the Hollander type
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
-
- 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
- D21H17/25—Cellulose
- D21H17/26—Ethers thereof
-
- 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
- D21H17/29—Starch 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
- 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
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/675—Oxides, hydroxides or carbonates
-
- 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
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
-
- 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
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
A technology for increasing the wet tension strength of paper made by wet method includes such steps as mixing raw fibre material with sodium carboxymethyl cellulose solution, beating, adding filler (0 ~ 35%), diluting the mixed pulp, adding assistant, shaping, squeezing, dewatering, drying, winding and cutting.
Description
Technical Field
The invention is applied to the field of papermaking, and particularly relates to a production technology for improving the wet tensile strength of wet-process papermaking paper.
Background
Paper is an indispensable important resource in human life, study and work. With the development of modern science and technology and the continuous improvement of the living standard of people, the use requirement of paper is increasingly increased, and the application range of the paper is wider and wider. Some paper types require application and processing under the action of water or in water, such as blueprint paper, filter paper, medical absorbent paper, household paper, decorative base paper and the like, and the paper needs to be kept intact, not deformed and have the service performance of the base paper after being contacted with sweat, dipped in glue, printed or drenched with rain, so that the paper needs to have high wet strength, and the common ways for improving the wet strength comprise that the addition amount of a wet strength agent is increased, the beating degree of raw materials is improved, and the fiber raw materials are preferably selected according to the type of the wet strength agent.
However, the more the wet strength agent is added, the more the wet strength is improved, when the amount reaches a certain degree, the wet strength is increased slowly, the potential of the pulp system is changed from the original negative value to a positive value, the retention rate is reduced, and the adsorption effect of the wet strength agent begins to be reduced. Above normal levels, the positive charge in the slurry increases with increasing wet strength agent, which can cause flocculation of the slurry and severely impact production. Therefore, the amount of the added wet strength agent has a peak value, and the peak value can be obviously changed according to different systems, and in addition, the improvement of the beating degree can improve the wet strength of the paper, but can change other properties of the paper, such as softness, water absorption and the like. Therefore, in actual production, the influence of the beating degree on the wet strength of the paper needs to be considered according to the characteristics of the paper.
Disclosure of Invention
The invention aims to provide a production technology for improving the wet tensile strength of wet-process paper, so as to solve the problems in the background technology. In order to achieve the purpose, the invention provides the following technical scheme:
A production technology for improving the wet tensile strength of wet paper making comprises the following steps:
(1) mixing the fiber raw material and the sodium carboxymethyl cellulose solution, pulping, and adding a filler accounting for 0 ~ 35% of absolute dry pulp;
(2) Diluting the mixed slurry, adding an auxiliary agent, and carrying out net-surfing forming treatment;
(3) Then the product is obtained by squeezing, dehydrating, drying, coiling and cutting in sequence.
preferably, the fiber raw material comprises one or more of bleached softwood pulp, bleached hardwood pulp, unbleached softwood pulp, unbleached hardwood pulp and hemp pulp.
Preferably, the mass concentration of the sodium carboxymethyl cellulose solution is 4-6%, wherein the addition amount of the sodium carboxymethyl cellulose is 3-6kg/t of paper.
Preferably, the filler comprises one or more of calcium carbonate, talcum powder, titanium dioxide, bentonite, diatomite, fly ash, wollastonite and hydrotalcite.
Preferably, the auxiliary agent is one or more of polyamide polyamine-epichlorohydrin resin (PAE), polyethylene oxide, cationic starch, polyvinyl alcohol and defoaming agent, wherein the PAE is added in an amount of 40-60kg/t of paper; the addition amount of the polyoxyethylene is 0.2 to 0.8 percent of the absolute dry pulp amount; the adding amount of the cationic starch is 4-6kg/t of paper; the addition amount of the defoaming agent is 1.0-3.0kg/t of paper; the addition of the polyvinyl alcohol is 40-60kg/t of paper.
Preferably, the dilution concentration in the step (2) is 0.05-0.6%.
Preferably, the pressing pressure for pressing and dewatering in the step (3) is 0.2-0.4 MPa.
Preferably, the drying temperature in the step (3) is 70-110 ℃.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts wet papermaking, and sodium carboxymethyl cellulose is added in the pulping process, and participates in the defibering or pulping process of pulp, so that the wet tensile strength of paper can be obviously improved. Meanwhile, the problem of pulp flocculation caused by adding more wet strength agents to certain paper with higher requirement on wet tensile strength can be effectively improved.
Detailed Description
in order that the above objects, features and advantages of the present invention can be more clearly understood, the present invention will be further described in detail with reference to the following claims and specific embodiments. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
in the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced otherwise than as specifically described herein, and thus the scope of the present invention is not limited by the specific embodiments disclosed below.
Example 1
The invention provides a production technology for improving wet tensile strength of wet paper making, which comprises the following steps:
(1) Mixing and pulping the fiber raw material and the sodium carboxymethyl cellulose solution, wherein the fiber raw material consists of 100% of bleached softwood pulp, the concentration of the bleached softwood pulp is 3%, the power is 90KW, the pulping time is 30min, the mass concentration of the sodium carboxymethyl cellulose solution is 6%, and the addition amount of the sodium carboxymethyl cellulose is 6kg/t of paper.
(2) Diluting the mixed slurry to the mass concentration of 0.1%, and sequentially adding 60kg/t of paper by adding PAE (polyamide polyamine-epichlorohydrin resin); the addition amount of polyethylene oxide PEO is 0.8 percent (absolute dry pulp amount), and the concentration is 0.05 percent; and 1.0kg of defoaming agent per ton of paper, and performing online treatment, wherein the online concentration is 0.4%.
(3) Then carrying out press dehydration and drying treatment, wherein the control parameters of the press dehydration are as follows: the pressure of the squeezing roller and the pressure of the carrier roller are respectively 0.3MPa and 0.1MPa, and the control parameters of the drying treatment are as follows: the cylinder machine station has two Yangke cylinders, the temperature is 110 ℃ and 100 ℃, and dry paper with the water content of 3.5 percent is obtained; and then sequentially coiling and cutting the dry paper to obtain the paper.
The performance of the cigarette matching paper obtained in the embodiment is as follows: quantitative determination of 42.2g/m2127 μm in thickness, 0.638kN/m in longitudinal tensile strength, 2.9% in longitudinal elongation, and 13.1J/m in longitudinal tensile energy absorption2Air permeability 15941CU, liquid absorption height 63mm/min, wet tensile strength 0.203kN/m, and liquid absorption 3.01 g/g.
Example 2
The invention provides a production technology for improving wet tensile strength of wet paper making, which comprises the following steps:
(1) mixing and pulping the fiber raw material and the sodium carboxymethyl cellulose solution, wherein the fiber raw material consists of 100% of bleached softwood pulp, the concentration of the bleached softwood pulp is 3%, the power is 100KW, the pulping time is 40min, the mass concentration of the sodium carboxymethyl cellulose solution is 4%, and the addition amount of the sodium carboxymethyl cellulose is 3kg/t of paper.
(2) diluting the mixed slurry to the mass concentration of 0.1%, and sequentially adding 45kg/t of polyamide polyamine-epichlorohydrin resin PAE; the addition amount of polyethylene oxide PEO is 0.6 percent (absolute dry pulp amount), and the concentration is 0.05 percent; defoaming agent 1.0kg/t paper, and carrying out online treatment.
(3) Then carrying out press dehydration and drying treatment, wherein the control parameters of the press dehydration are as follows: the pressure of the carrier roller is 0.3MPa, the pressure of the squeezing roller is 0.2MPa, and the control parameters of the drying treatment are as follows: a Yankee cylinder, the temperature is 100 ℃, and dry paper with the water content of 3.5 percent is obtained; and then sequentially coiling and cutting the dry paper to obtain the paper.
The performance of the cigarette matching paper obtained in the embodiment is as follows: quantitative determination of 42.1g/m2133 μm in thickness, 0.609 kN/m in longitudinal tensile strength, 1.6% in longitudinal elongation, 5.58J/m in longitudinal tensile energy absorption2Air permeability 15361CU, liquid absorption height 52mm/min, wet tensile strength 0.135kN/m, liquid absorption 3.3 g/g.
Example 3
The invention provides a production technology for improving wet tensile strength of wet paper making, which comprises the following steps:
(1) Mixing and pulping a fiber raw material and a sodium carboxymethyl cellulose solution, wherein the weight ratio of the bleached softwood pulp to the bleached hardwood pulp of the fiber raw material is 1: 1, the concentration of bleached softwood pulp is 4%, the power is 200KW, the pulping time is 60min, the concentration of bleached softwood pulp is 5%, the power is 180KW, the pulping time is 60min, and the mass concentration of a sodium carboxymethylcellulose solution is 6%, wherein the addition amount of the sodium carboxymethylcellulose is 3kg/t of paper.
(2) Diluting the mixed slurry to the mass concentration of 0.6%, and sequentially adding 40kg/t of paper by adding PAE (polyamide polyamine-epichlorohydrin resin); 6kg/t of cationic starch paper; 3.0kg of defoaming agent per ton of paper,
(3) Then carrying out press dehydration and drying treatment, wherein the control parameters of the press dehydration are as follows: adopting a fourdrinier paper machine, wherein the pressing pressure is 80kN/m and 100kN/m, and the control parameters of drying treatment are as follows: fourdrinier, drying at 66 deg.C, 75 deg.C, 88 deg.C, 94 deg.C, 97 deg.C, 104 deg.C, 88 deg.C, 92 deg.C, 104 deg.C, 105 deg.C, 95 deg.C, 59 deg.C to obtain dried paper sheet with water content of 3.5%; and then sequentially coiling and cutting the dry paper to obtain the paper.
The performance of the cigarette matching paper obtained in the embodiment is as follows: quantitative determination 27.9g/m2Longitudinal tensile strength of 2.17kN/m, longitudinal elongation of 1.4%, and longitudinal tensile energy absorption of 19J/m2Thickness 43 μm, ash (calculated as CaO) 8.8%, air permeability 8.1CU, wet tensile strength in machine direction 0.42 kN/m.
Example 4
The invention provides a production technology for improving wet tensile strength of wet paper making, which comprises the following steps:
(1) Mixing and pulping the fiber raw material and the sodium carboxymethyl cellulose solution, wherein the limiting raw material consists of 100% of bleached softwood pulp, the concentration of the bleached softwood pulp is 3%, the power is 45KW, the pulping time is 30min, the mass concentration of the sodium carboxymethyl cellulose solution is 5%, and the addition amount of the sodium carboxymethyl cellulose is 5kg/t of paper.
(2) Diluting the mixed slurry to the mass concentration of 0.05%, and sequentially adding 40kg/t of polyamide polyamine-epichlorohydrin resin PAE; polyethylene oxide PEO was added at 0.8% (absolute dry pulp) and 0.05% concentration, and was topcoated with polyvinyl alcohol PVA at 6% concentration and 40kg/t paper.
(3) Then carrying out press dehydration and drying treatment, wherein the control parameters of the press dehydration are as follows: adopting an inclined wire paper machine, pressing pressures of 80kN/m, 100kN/m and 120kN/m, and controlling parameters of drying treatment as follows: the inclined wire paper machine has drying cylinder temperature of 73 deg.C, 85 deg.C, 92 deg.C, 101 deg.C, 106 deg.C, 123 deg.C, 125 deg.C, 107 deg.C, 117 deg.C, and 122 deg.C to obtain dry paper sheet with water content of 3.5%; and then sequentially coiling and cutting the dry paper to obtain the paper.
The performance of the cigarette matching paper obtained in the embodiment is as follows: quantitative determination 23.2g/m2Thickness 63 μm, longitudinal tensile strength 2.25 kN/m, longitudinal elongation 1.7%, longitudinal tensile energy absorption 24.6J/m2Air permeability 5863CU, liquid absorption height 16mm/min, wet tensile strength 0.43 kN/m.
Comparative example 1
This comparative example provides a method for producing an ultralow-basis-weight bible paper, which is different from example 1 in that: the carboxymethyl cellulose sodium is not added into the mixed slurry, and the fiber raw material is directly pulped. The other conditions were the same as in example 1.
the performance indexes of the bible paper obtained by the comparative example are as follows: quantitative determination 41.6g/m2130 μm in thickness, 0.51kN/m in longitudinal tensile strength, 2.7% in longitudinal elongation, 11.1J/m in longitudinal tensile energy absorption2Air permeability of 14265CU, liquid absorption height of 60mm/min, wet tensile strength of 0.142kN/m, and liquid absorption amount of 2.98 g/g.
Comparative example 2
this comparative example provides a method for producing an ultralow-basis-weight bible paper, which is different from example 3 in that: the carboxymethyl cellulose sodium is not added into the mixed slurry, and the fiber raw material is directly pulped. The other conditions were the same as in example 3.
the performance indexes of the bible paper obtained by the comparative example are as follows: quantitative determination of 28.2g/m2Longitudinal tensile strength of 2.17kN/m, longitudinal elongation of 1.3%, longitudinal tensile energy absorption of 17.6J/m2thickness 41 μm, ash (calculated as CaO) 8.1%, air permeability 4.1CU, wet tensile strength in machine direction 0.24 kN/m.
The results of examples 1-4 and comparative examples 1-2 are summarized in table 1, as follows:
TABLE 1
Through the data in the table 1, it can be found that the paper produced by the method of the present invention has moderate production process time, and the paper has large wet tensile strength, which is improved by 25% to 80% compared with the existing paper, and does not affect other important physical indexes of the paper.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A production technology for improving the wet tensile strength of wet-process paper making is characterized in that; the method comprises the following steps:
Mixing the fiber raw material and the sodium carboxymethyl cellulose solution, pulping, and adding a filler accounting for 0 ~ 35% of absolute dry pulp;
Diluting the mixed slurry, adding an auxiliary agent, and carrying out net-surfing forming treatment;
Then the product is obtained by squeezing, dehydrating, drying, coiling and cutting in sequence.
2. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the fiber raw material comprises one or more of bleached softwood pulp, bleached hardwood pulp, unbleached softwood pulp, unbleached hardwood pulp and hemp pulp.
3. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the mass concentration of the sodium carboxymethyl cellulose solution is 4-6%, wherein the addition amount of the sodium carboxymethyl cellulose is 3-6kg/t of paper.
4. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the filler is selected from one or more of calcium carbonate, talcum powder, titanium dioxide, bentonite, diatomite, fly ash, wollastonite and hydrotalcite.
5. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the auxiliary agent is one or more of polyamide polyamine-epichlorohydrin resin, polyethylene oxide, cationic starch, polyvinyl alcohol and defoaming agent, wherein the addition amount of polyamide polyamine-epichlorohydrin resin is 40-60kg/t of paper; the adding amount of the polyoxyethylene is 0.2 to 0.8 percent of the absolute dry pulp amount; the adding amount of the cationic starch is 4-6kg/t of paper; the addition amount of the defoaming agent is 1.0-3.0kg/t of paper; the addition of the polyvinyl alcohol is 40-60kg/t of paper.
6. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the dilution concentration in the step (2) is 0.05-0.6%.
7. the production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the pressing pressure of the pressing dehydration in the step (3) is 0.2-0.4 MPa.
8. The production technology for improving the wet tensile strength of wet-process paper sheets according to claim 1, characterized in that; the drying temperature in the step (3) is 70-110 ℃.
9. a wet-laid paper sheet, characterized in that it is produced by the production technique according to any of claims 1 ~ 9.
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| CN114541175A (en) * | 2020-11-24 | 2022-05-27 | 金华盛纸业（苏州工业园区）有限公司 | Preparation method of high wet strength paper and high wet strength paper |
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| CN114541175A (en) * | 2020-11-24 | 2022-05-27 | 金华盛纸业（苏州工业园区）有限公司 | Preparation method of high wet strength paper and high wet strength paper |
| CN112553962A (en) * | 2020-12-08 | 2021-03-26 | 上海东冠纸业有限公司 | Production method of high-strength and easy-to-disperse toilet wiping paper |
| CN112553962B (en) * | 2020-12-08 | 2023-04-07 | 上海东冠纸业有限公司 | Production method of high-strength and easy-to-disperse toilet wiping paper |
| CN115075041A (en) * | 2022-05-18 | 2022-09-20 | 华南理工大学 | High-air-permeability paper bag and preparation method and application thereof |
| CN115075041B (en) * | 2022-05-18 | 2023-06-20 | 华南理工大学 | High-air-permeability paper bag paper and preparation method and application thereof |
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Application publication date: 20191217 |