CN117026669A - Production method of environment-friendly handbag paper - Google Patents
Production method of environment-friendly handbag paper Download PDFInfo
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- CN117026669A CN117026669A CN202311108424.5A CN202311108424A CN117026669A CN 117026669 A CN117026669 A CN 117026669A CN 202311108424 A CN202311108424 A CN 202311108424A CN 117026669 A CN117026669 A CN 117026669A
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000011121 hardwood Substances 0.000 claims abstract description 38
- 239000011122 softwood Substances 0.000 claims abstract description 38
- 239000004816 latex Substances 0.000 claims abstract description 37
- 229920000126 latex Polymers 0.000 claims abstract description 37
- 239000004627 regenerated cellulose Substances 0.000 claims abstract description 36
- 239000002994 raw material Substances 0.000 claims abstract description 33
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 31
- FDYSSWYQRTVFIS-UHFFFAOYSA-N buta-1,3-diene 3-phenylprop-2-enoic acid Chemical compound C=CC=C.C(=O)(O)C=CC1=CC=CC=C1 FDYSSWYQRTVFIS-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000011248 coating agent Substances 0.000 claims abstract description 12
- 238000000576 coating method Methods 0.000 claims abstract description 12
- 238000004806 packaging method and process Methods 0.000 claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 7
- 239000000835 fiber Substances 0.000 claims description 51
- 239000000126 substance Substances 0.000 claims description 31
- 238000004513 sizing Methods 0.000 claims description 28
- 238000010009 beating Methods 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 19
- 125000002091 cationic group Chemical group 0.000 claims description 17
- 229920002401 polyacrylamide Polymers 0.000 claims description 17
- 239000002174 Styrene-butadiene Substances 0.000 claims description 8
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 8
- 239000011115 styrene butadiene Substances 0.000 claims description 8
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 8
- 229920000297 Rayon Polymers 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 229920000433 Lyocell Polymers 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 3
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 3
- 241001330002 Bambuseae Species 0.000 claims description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 3
- 239000011425 bamboo Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims 1
- 239000006185 dispersion Substances 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 8
- 229920002678 cellulose Polymers 0.000 abstract description 4
- 239000001913 cellulose Substances 0.000 abstract description 4
- 238000011161 development Methods 0.000 abstract description 3
- 239000002028 Biomass Substances 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 98
- 238000004537 pulping Methods 0.000 description 16
- 229910052739 hydrogen Inorganic materials 0.000 description 12
- 239000001257 hydrogen Substances 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 10
- 229920003023 plastic Polymers 0.000 description 7
- 239000004033 plastic Substances 0.000 description 7
- 230000007613 environmental effect Effects 0.000 description 6
- 230000009477 glass transition Effects 0.000 description 6
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 6
- 239000002655 kraft paper Substances 0.000 description 6
- 239000000843 powder Substances 0.000 description 6
- 229920002472 Starch Polymers 0.000 description 5
- 239000008107 starch Substances 0.000 description 5
- 235000019698 starch Nutrition 0.000 description 5
- 229920000742 Cotton Polymers 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000000853 adhesive Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 description 2
- 241000196324 Embryophyta Species 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000007888 film coating Substances 0.000 description 2
- 238000009501 film coating Methods 0.000 description 2
- 239000003317 industrial substance Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 239000004745 nonwoven fabric Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- BYHDDXPKOZIZRV-UHFFFAOYSA-N 5-phenylpentanoic acid Chemical compound OC(=O)CCCCC1=CC=CC=C1 BYHDDXPKOZIZRV-UHFFFAOYSA-N 0.000 description 1
- 244000025254 Cannabis sativa Species 0.000 description 1
- 235000012766 Cannabis sativa ssp. sativa var. sativa Nutrition 0.000 description 1
- 235000012765 Cannabis sativa ssp. sativa var. spontanea Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000219146 Gossypium Species 0.000 description 1
- 229920002522 Wood fibre Polymers 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 235000009120 camo Nutrition 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 235000005607 chanvre indien Nutrition 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000007334 copolymerization reaction Methods 0.000 description 1
- 229920006238 degradable plastic Polymers 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 238000007720 emulsion polymerization reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000011487 hemp Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- 238000002360 preparation method Methods 0.000 description 1
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- 230000009467 reduction Effects 0.000 description 1
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- 230000002195 synergetic effect Effects 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
- 239000002025 wood fiber Substances 0.000 description 1
Classifications
-
- 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
- D21H17/02—Material of vegetable origin
-
- 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
- D21H17/03—Non-macromolecular organic compounds
- D21H17/05—Non-macromolecular organic compounds containing elements other than carbon and hydrogen only
- D21H17/14—Carboxylic acids; Derivatives thereof
Landscapes
- Paper (AREA)
Abstract
The application belongs to the field of new papermaking materials, and particularly relates to a production method of environment-friendly handbag paper, which mainly comprises the following raw materials of softwood pulp, hardwood pulp, regenerated cellulose fiber and carboxyl styrene-butadiene latex, wherein the coating amount of the carboxyl styrene-butadiene latex on the paper surface is 1.5-2.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The environment-friendly handbag paper takes cellulose as a main raw material, belongs to the category of biomass products, can be completely degraded, and utilizes the characteristic that regenerated cellulose fibers have toughness no matter in a dry or wet state. The paper has the characteristics of high strength, degradability, high softness, comfortable hand feeling and the like, and has wide development prospect in the packaging field.
Description
Technical Field
The application belongs to the field of new papermaking materials, and particularly provides environment-friendly handbag paper and a production method thereof.
Background
With the improvement of environmental protection consciousness, a plurality of countries are led out of the platform for 'plastic restriction' or 'plastic forbidden'. Under the guidance of policies such as plastic restriction, the use of plastic products in daily life is gradually restricted, green environment-friendly packaging becomes an important development trend of packaging industry, and the policy execution steps such as carbon reduction, environment protection and plastic pollution control are accelerated. In particular, market demands for food-grade cardboard, environmentally friendly paper plastic cutlery boxes, etc. are increasing; environmental protection sack, paper bag etc. are also promoted and used more in places such as market, supermarket etc..
At present, paper handbags with various forms and materials are also available on the market, the main raw materials of the paper handbags are wood fibers, namely raw fibers, the fibers are shorter, the formed net structure cannot provide enough strength, the common method for changing the problem is to pulp and fibrillate the paper handbags, and increase the bonding points of hydrogen bonds, but the flexibility of the paper is reduced, and the paper sheets are stiff, brittle, easy to crack, poor in hand feeling, weak in reusability and the like, so that the paper handbags are unfavorable to be used as packaging paper. And if the common packaging paper is processed by a film coating method and the like to improve the moisture resistance, the film coating processing is not beneficial to environmental protection.
Whether the use scene of the handbag can be met or not, and the degradable plastic bag which meets the environmental protection policy, has soft hand feeling similar to a plastic bag and has shape plasticity is provided; the product has the burst strength of commodity corner resistance; the paper is not easy to be torn up like ordinary paper when the paper is damaged slightly; and special paper with sufficient strength under normal conditions, wet conditions and the like becomes a problem to be solved by the applicant.
Disclosure of Invention
The application provides an environment-friendly handbag paper and a production method thereof, aiming at the problems of the technology, the main raw materials of the environment-friendly handbag paper comprise softwood pulp, hardwood pulp, regenerated cellulose fiber and carboxyl styrene-butadiene latex, wherein the coating amount of the carboxyl styrene-butadiene latex on the paper surface is 1.5-2.5g/m 2 The method comprises the steps of carrying out a first treatment on the surface of the The environment-friendly handbag paper takes cellulose as a main raw material, belongs to the category of biomass products, can be completely degraded, and utilizes the characteristic that regenerated cellulose fibers have toughness no matter in a dry or wet state. The paper has the characteristics of high strength, degradability, high softness, comfortable hand feeling and the like, and has wide development prospect in the packaging field.
The specific technical scheme of the application is as follows:
an environment-friendly handbag paper comprises softwood pulp, hardwood pulp, regenerated cellulose fiber and carboxyl styrene-butadiene latex as main raw materials, wherein the coating weight of the carboxyl styrene-butadiene latex on paper surface is 1.5-2.5g/m 2 。
Further, the softwood pulp is bleached chemical softwood pulp or unbleached chemical softwood pulp; hardwood pulp is bleached chemical hardwood pulp or unbleached chemical hardwood pulp.
The regenerated cellulose fiber can be one or more of viscose fiber, tencel fiber (also called as "Tencel", "Lyocell"), modal fiber (also called as "Modal" and "Modal"), and bamboo fiber.
The carboxyl styrene-butadiene latex is a copolymer prepared by emulsion polymerization of butadiene, styrene, a small amount of carboxylic acid and other auxiliary agents.
The four raw materials are obtained from direct purchase in the market, and the four main raw materials are adopted in the application for the following reasons:
the softwood pulp is one of the main raw materials of the paper, and the fibers have hydrogen bonding force and can provide bonding strength; hardwood pulp is also one of the main raw materials of paper, the fiber length is relatively short, the fiber is dispersed more uniformly in a water system, and the uniformity of the finished paper can be improved in the papermaking process of the paper.
The regenerated cellulose fiber is prepared from natural cellulose (cotton, hemp, bamboo, tree and shrub) as raw material by changing only the physical structure of natural cellulose without changing its chemical structure, thereby producing regenerated cellulose fiber with better performance. The structural composition is similar to that of cotton, except that the moisture absorption and air permeability are better than those of cotton fibers, so that the cotton fiber is the one with the best moisture absorption and air permeability among all chemical fibers. The regenerated cellulose fiber product takes natural plant fiber as raw material, is 100 percent pure natural material, is naturally biodegradable, free of addition, free of heavy metal and harmful chemical substances, has no stimulation to skin affinity, and is environment-friendly fiber with excellent performance. The regenerated cellulose is similar to the original fiber, active hydroxyl exists on the molecule, the surface of the regenerated cellulose is smoother, the hydrogen bond bonding density formed by the hydroxyl exposed outside is small, the length of the regenerated cellulose is large, and enough bonding force is ensured, so that each link in the production of the regenerated cellulose fiber can be subjected to graft copolymerization with a plurality of other molecules to carry out bonding modification. Meanwhile, the regenerated cellulose fiber has toughness in a dry or wet state, and the regenerated cellulose fiber has better dry breaking elongation and wet breaking wet length than the original plant fiber, so that the regenerated cellulose fiber is beneficial to improving the elasticity of paper, and the regenerated cellulose fiber has excellent air permeability and is particularly important performance for producing paper bags.
The inventor selects softwood pulp, hardwood pulp and regenerated cellulose fiber as main raw materials of the paper, and the synergy of the three raw materials is as follows: the softwood pulp and hardwood pulp fibers are shorter, so that uniformity of finished paper is guaranteed, and after the softwood pulp and hardwood pulp fibers are slightly pulped, dense hydroxyl groups are formed on the surfaces of the fibers, a certain number of hydrogen bond bonding points can be formed among the fibers, and certain strength and stiffness are provided for paper sheets. The regenerated cellulose fiber has smooth and uniform surface, but larger length, forms more interweaving, and makes more contribution in the aspects of flexibility, tear resistance, burst strength and the like. In order to ensure flexibility, the lost part of the various fibers in the aspect of bonding strength is compensated by the carboxylated styrene-butadiene latex with ultralow glass transition temperature, so that the excellent performances of paper in the aspects of flexibility, tear resistance, burst resistance and the like are generally ensured. Meanwhile, the water-resistant sizing agent is added into the paper, and the styrene-butadiene latex used on the surface has very good water resistance, so that the water resistance of the product is ensured, and the strength of the product in a humid environment is not lost.
The application selects the carboxyl styrene-butadiene latex with extremely low glass transition temperature (Tg), one of the purposes is that the latex is softer at normal temperature, and the paper softness can be ensured; secondly, the adhesive force of the latex is stronger, so that the bonding force between fibers can be increased; thirdly, a water-resistant layer can be formed after the surface of the paper sheet is coated, so that the water resistance of the paper sheet is improved.
Among the above raw materials, the fiber raw materials for forming the paper are formed by softwood pulp, hardwood pulp and regenerated cellulose fiber, wherein the weight percentage of the softwood pulp is 30% -40%, the weight percentage of the hardwood pulp is 15% -30%, and the weight percentage of the regenerated cellulose pulp is 30% -50%, and the total of the three is 100%.
Still further, wherein the softwood pulp: the beating degree is 20-22 DEG SR, the wet weight is 8-10g, and the beating concentration is 2.5-3.0%;
hardwood pulp: the beating degree is 20-22 DEG SR, the wet weight is 1.8-2.5g, and the beating concentration is 2.5-3.0%;
regenerated cellulose fibers: dispersing and fluffing at a concentration of 1.5-2.0% with a length of 0.6-1.5 mm; specifically, a hydropulper can be adopted, and clear water or papermaking white water is used for fluffing.
The solid content of the carboxylated styrene-butadiene latex product is more than or equal to 40%, the PH value is more than or equal to 6.5, the viscosity is less than or equal to 100mPa.s (25 ℃), and the Tg is less than or equal to-10 ℃.
When in use, the paper is diluted by 4-5 times by online water, and the coating weight on the paper surface is adjusted to be 1.5-2.5g/m 2 。
Besides, AKD sizing agent and cationic polyacrylamide can be added in the preparation of the environment-friendly handbag paper; 5-15kg of AKD sizing agent in pulp per ton of paper; cationic polyacrylamide 0.3-0.7 kg/ton paper. Wherein AKD mainly performs sizing in pulp, so that the water resistance of paper sheets is improved; the main function of the cationic polyacrylamide is to help retention and improve the retention rate of AKD.
The production method of the environment-friendly handbag paper comprises the following specific steps:
the bleached chemical softwood pulp, the bleached chemical hardwood pulp and the regenerated cellulose fibers are uniformly mixed in a mixed pulp tank, are purified by a pressure screen, are added with an AKD sizing agent and cationic polyacrylamide on line through a pipeline, are pumped into a pre-papermaking tank, and enter a papermaking machine for papermaking and forming.
Drying the water content to be less than or equal to 5% in a pre-drying area of a paper machine, and coating 1.5-2.5g/m of diluted carboxyl styrene-butadiene latex mixed solution on the surface of a paper page through a surface sizing device 2 (absolute amount) latex. And then the paper is dried to 4 to 6 percent of moisture in a post-drying area, and a paper roll is formed at the coiling part of the paper machine. Finally, the materials are cut into different specifications and sizes according to the demands of customers, and the materials are packaged and put in storage.
In addition, other specific steps of the present application are the same as those of the prior art, and the inventor does not need to describe the steps again.
Compared with the prior art, the application has the main characteristics that:
the regenerated cellulose fiber short yarn used in the application is mainly applied to textile industry, and compared with wood pulp for papermaking, the fiber short yarn has longer fiber length, has the advantages of improving the strength and being softer;
the carboxyl styrene-butadiene latex emulsion with lower glass transition temperature is more applied to industrial and medical gloves, is softer at normal temperature, has stronger adhesive strength after being dried and has very good water resistance, so that the application is beneficial to keeping the soft performance of paper, improving the strength and the water resistance, and further improving the wet strength of paper sheets;
compared with common paper, the softwood pulp and hardwood pulp are lighter in pulping and low in beating degree, and the reason for doing so is that hydroxyl groups on wood pulp fibers are utilized to form hydrogen bond combination, but the phenomenon that paper sheets become stiff due to excessive hydrogen bond combination is avoided, and the part of reduced hydrogen bond combination force is compensated by the adhesive force of carboxyl styrene-butadiene latex;
and fourthly, the finally obtained handbag paper can replace non-woven fabrics and the like, but compared with the non-woven fabrics, the 100% degradable fiber raw material is used in the patent, and the handbag paper is a new product meeting the environmental protection policy.
Drawings
Fig. 1 is a schematic diagram of a process flow for producing the handbag paper.
Description of the embodiments
The above-described aspects of the present application will be described in further detail by way of the following embodiments, but it should not be construed that the scope of the above-described subject matter of the present application is limited to the following examples. All techniques realized based on the above description of the present application are within the scope of the present application, and the following examples are accomplished by conventional techniques unless otherwise specified. The following percentages are by weight, unless specified otherwise.
Example 1
An environment-friendly handbag paper and a production method thereof are provided:
raw material selection:
the softwood pulp is bleached chemical softwood pulp, which is added according to 30 percent of the total fiber raw material, the pulping concentration is 3.0 percent, the beating degree after pulping is 20-22 DEG SR, and the wet weight is 8-10g.
The hardwood pulp is bleached chemical hardwood pulp, which is added according to 30% of the total fiber raw material, the pulping concentration is 2.0%, the beating degree after beating is 20-22 DEG SR, and the wet weight is 2-2.5g.
The regenerated cellulose fiber is viscose fiber with the length of 1.5mm, which is added according to 40 percent of the total fiber raw material and dispersed and fluffed uniformly under the concentration of 1.5 percent.
The carboxyl styrene-butadiene latex is HGL1001, has solid content of 45%, pH value of 7.0, viscosity of less than or equal to 89mPa.s (25 ℃), and glass transition temperature (Tg) of 15 ℃. When in use, the coating weight of the paper surface is 2.0g/m after the paper surface is diluted by 4 times by online water 2 。
AKD sizing agent and cationic polyacrylamide are industrial chemicals for conventional papermaking in the market. The consumption of AKD sizing agent is 10 kg/ton of paper; cationic polyacrylamide 0.5 kg/ton paper.
The production method comprises the following specific steps:
uniformly mixing the treated bleached chemical softwood pulp, bleached chemical hardwood pulp and viscose in a mixed pulp tank, purifying by a pressure sieve, adding an AKD sizing agent and cationic polyacrylamide on line through a pipeline, pumping to a papermaking tank, and making into a papermaking machine for forming.
Drying the water content to be less than or equal to 5% in a pre-drying area of a paper machine, and coating 2.0g/m on the surface of a paper page by a surface sizing device from the diluted carboxyl styrene-butadiene latex mixed solution 2 (absolute amount) latex. And then the paper is dried to 4 to 6 percent of moisture in a post-drying area, and a paper roll is formed at the coiling part of the paper machine. Finally, the powder is cut into different specifications and sizes according to the requirements of customers, and 150g/m of powder is finally obtained 2 White handbag paper, package and warehouse-in.
Comparative example 1 comparative 150g/m 2 The main production process of white kraft paper for making handbag comprises:
the softwood pulp is bleached chemical softwood pulp, which is added according to 50% of the total fiber raw material, the pulping concentration is 4.0%, the beating degree after pulping is 38-40 DEG SR, and the wet weight is 6-7g.
The hardwood pulp is bleached chemical hardwood pulp, which is added according to 50% of the total fiber raw material, the pulping concentration is 4.0%, the beating degree after beating is 42-45 DEG SR, and the wet weight is 1.5-2.0g.
In addition, AKD sizing agent and cationic polyacrylamide are used in the pulp, and starch sizing agent is used on the surface of paper.
The production method comprises the following specific steps:
uniformly mixing the treated bleached chemical softwood pulp and bleached chemical hardwood pulp in a mixed pulp tank, purifying by a pressure sieve, adding an AKD sizing agent and cationic polyacrylamide on line through a pipeline, pumping to a pre-papermaking tank, and making into paper by a papermaking machine.
Drying the water to less than or equal to 5% in the pre-drying area of the paper machine, and carrying out surface sizing on the surface according to the production aspect of normal packaging paper, wherein the sizing agent is mainly starch. And then the paper is dried to 4 to 6 percent of moisture in a post-drying area, and a paper roll is formed at the coiling part of the paper machine. Finally, the powder is cut into different specifications and sizes according to the requirements of customers, and 150g/m of powder is finally obtained 2 White kraft paper for making handbag, packaging and warehousing.
Example 2
An environment-friendly handbag paper and a production method thereof are provided:
raw material selection:
the softwood pulp is unbleached chemical softwood pulp, which is added according to 50 percent of the total fiber raw material, the pulping concentration is 2.5 percent, the beating degree after pulping is 20-22 DEG SR, and the wet weight is 8-10g.
The hardwood pulp is unbleached chemical hardwood pulp, which is added according to 15 percent of the total fiber raw material, the pulping concentration is 3.0 percent, the beating degree after pulping is 20-22 DEG SR, and the wet weight is 2-2.5g.
The regenerated cellulose fiber is Modal fiber with the length of 1.0mm, which is added according to 35 percent of the total fiber raw material and is uniformly dispersed at the concentration of 2.0 percent.
The carboxylated styrene-butadiene latex is HGL1001 carboxylated styrene-butadiene latex manufactured by Qinghai Huatai paper company, and has the solid content of 45%, the pH value of 7.0, the viscosity of less than or equal to 89mPa.s (25 ℃), and the glass transition temperature (Tg) of between 15 ℃. When in use, the coating is diluted by 4 times by online water and the coating weight on paper surface is 2.5g/m 2 。
AKD sizing agent and cationic polyacrylamide are industrial chemicals for conventional papermaking in the market. The AKD sizing agent dosage is 5 kg/ton of paper; cationic polyacrylamide 0.3 kg/ton paper.
The production method comprises the following specific steps:
uniformly mixing the treated bleached chemical softwood pulp, bleached chemical hardwood pulp and viscose in a mixed pulp tank, purifying by a pressure sieve, adding an AKD sizing agent and cationic polyacrylamide on line through a pipeline, pumping to a papermaking tank, and making into a papermaking machine for forming.
Drying the water content to be less than or equal to 5% in a pre-drying area of a paper machine, and coating 2.5g/m of diluted carboxyl styrene-butadiene latex mixed solution on the surface of a paper page through a surface sizing device 2 (absolute amount) latex. And then the paper is dried to 4 to 6 percent of moisture in a post-drying area, and a paper roll is formed at the coiling part of the paper machine. Finally, the powder is cut into different specifications and sizes according to the requirements of customers, and finally 50g/m is obtained 2 And (5) packaging and warehousing the natural color handbag paper.
Comparative example 2 comparative 50g/m 2 The main production process of natural kraft paper for making handbag comprises:
the softwood pulp is unbleached chemical softwood pulp, 70% of the total fiber raw material is added, the pulping concentration is 4.0%, the beating degree is 38-40 DEG SR after pulping, and the wet weight is 6-7g.
The hardwood pulp is unbleached chemical hardwood pulp, which is added according to 30% of the total fiber raw material, the pulping concentration is 4.0%, the beating degree is 42-45 DEG SR after pulping, and the wet weight is 1.5-2.0g.
In addition, AKD sizing agent and cationic polyacrylamide are used in the pulp, and starch sizing agent is used on the surface of paper.
The production method comprises the following specific steps:
uniformly mixing the treated bleached chemical softwood pulp and bleached chemical hardwood pulp in a mixed pulp tank, purifying by a pressure sieve, adding an AKD sizing agent and cationic polyacrylamide on line through a pipeline, pumping to a pre-papermaking tank, and making into paper by a papermaking machine.
Drying the water to less than or equal to 5% in the pre-drying area of the paper machine, and carrying out surface sizing on the surface according to the production aspect of normal packaging paper, wherein the sizing agent is mainly starch. And then the paper is dried to 4 to 6 percent of moisture in a post-drying area, and a paper roll is formed at the coiling part of the paper machine. Finally, the powder is cut into different specifications and sizes according to the requirements of customers, and finally 50g/m is obtained 2 The natural color kraft paper is used for making handbag, and is packaged into a warehouse.
Experimental example
The sheets obtained in examples and comparative examples were subjected to performance experiments, and the results are shown below:
| product name | Dry tensile index (transverse) Direction) N.m/g | Wet tensile index (transverse direction) (soaking for 10 min) N.m/g | Burst index Kpa.m 2 /g | Stiffness (machine/transverse) Direction) mN/N mm | Tear index (longitudinal) mN.m 2 /g | |
| Example 1 | 150g/m 2 White handbag paper | 50.4 | 12.3 | 9.3 | 184/83 | 16.4 |
| Comparative example 1 | 150g/m 2 For making handhelds White kraft paper of bag | 45.1 | 5.1 | 6.7 | 528/341 | 8.1 |
| Example 2 | 50g/m 2 Natural color handbag paper | 55.6 | 14.6 | 11.2 | 28/11 | 19.3 |
| Comparative example 2 | 50g/m 2 For making handhelds Natural color kraft paper for bags | 53.2 | 4.9 | 7.9 | 110/75 | 7.4 |
Wherein dry tensile index (transverse): the examples are all higher than the comparative examples because softwood pulp and hardwood pulp have denser hydroxyl groups on the surface of the fibers after slightly pulping, and a certain number of hydrogen bond bonding points can be formed between the fibers to provide certain strength and stiffness to the paper sheet. However, the regenerated cellulose fibers adopted in the examples have smooth and uniform surfaces and larger lengths, form more interweaving and also make more contribution to the strength index. Although the beating degree of various fiber raw materials is lower, partial hydrogen bonding is lost, the carboxy styrene-butadiene latex with larger length and larger bonding strength of regenerated cellulose fibers is used for compensation. Wet tensile index (transverse direction): the carboxyl styrene-butadiene latex used in the technology replaces the starch glue of a comparative example, the moisture resistance of the latex is stronger, the latex coats the surface of the fiber, the hydrogen bond of various fibers is not opened and the strength is not reduced under the damp factor, and the cohesiveness of the latex also maintains higher wet strength.
Burst index, tear index: the embodiment is substantially higher than the comparative example, because the two indexes are greatly influenced by the fiber length, the regenerated cellulose fiber length used in the method is far longer than that of softwood pulp and hardwood pulp, and the binding force of the carboxylic styrene-butadiene latex is larger, and the vitrification temperature is lower (namely, the flexibility of the carboxybutylbenzene latex can be kept at normal temperature), so that the elasticity of paper is ensured, and meanwhile, the bursting and tearing resistance are improved.
Stiffness of: from the data, it can be seen that the examples have lower stiffness, which means that they have better softness. In the embodiment of the patent, the softwood pulp and the hardwood pulp particularly reduce the beating strength and reduce the hydrogen bond bonding points among fibers; regenerated cellulose fibers have fewer exposed hydroxyl groups, smooth and uniform surfaces, but have a larger length, forming more interlaces, and therefore fewer fixed hydrogen bonding points between fibers, and relatively free movement between fibers. In order to ensure flexibility, the patent uses the carboxylated styrene-butadiene latex with ultralow glass transition temperature, the latex can have stronger cohesive force at normal temperature, and the flexibility is particularly good, so that the softness of the paper sheet under high strength is ensured under the synergistic effect.
According to the above, the handbag paper obtained by the application has obvious advantages in dry strength and wet strength indexes, the softness of the paper is very good (stiffness is low), the hand feeling is comfortable, and the requirement of environmental protection degradation can be met due to the adoption of 100% degradable fiber raw materials.
Various equivalent modifications and substitutions may be made in the embodiments of the present application by those skilled in the art without departing from the spirit and scope of the present application, and it is intended that all such modifications and substitutions be within the scope of the present application, and any person skilled in the art will readily recognize that such modifications and substitutions are within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. An environment-friendly handbag paper is characterized in that: the main raw materials are softwood pulp, hardwood pulp, regenerated cellulose fiber and carboxylThe coating weight of the carboxyl styrene-butadiene latex on paper surface is 1.5-2.5g/m 2 ；
The total weight of the softwood pulp, the hardwood pulp and the regenerated cellulose fiber is 100 percent, wherein the softwood pulp accounts for 30-40 percent, the hardwood pulp accounts for 15-30 percent and the regenerated cellulose pulp accounts for 30-50 percent.
2. The environment-friendly handbag paper as claimed in claim 1, characterized in that: the softwood pulp is bleached chemical softwood pulp or unbleached chemical softwood pulp; hardwood pulp is bleached chemical hardwood pulp or unbleached chemical hardwood pulp.
3. The environment-friendly handbag paper as claimed in claim 1, characterized in that: the regenerated cellulose fiber is selected from one or more of viscose fiber, tencel fiber, modal fiber and bamboo fiber.
4. The environment-friendly handbag paper as claimed in claim 1, characterized in that:
the solid content of the carboxylated styrene-butadiene latex product is more than or equal to 40%, the PH value is more than or equal to 6.5, the viscosity is less than or equal to 100mPa.s (25 ℃), and the Tg is less than or equal to-10 ℃.
5. The environment-friendly handbag paper as claimed in claim 2, characterized in that:
softwood pulp: the beating degree is 20-22 DEG SR, the wet weight is 8-10g, and the beating concentration is 2.5-3.0%;
hardwood pulp: the beating degree is 20-22 DEG SR, the wet weight is 1.8-2.5g, and the beating concentration is 2.5-3.0%;
regenerated cellulose fibers: the length is 0.6-1.5mm, and the dispersion fluffs under the concentration of 1.5-2.0%.
6. The environment-friendly handbag paper as claimed in claim 1, characterized in that: the raw materials also comprise AKD sizing agent and cationic polyacrylamide; wherein the dosage of AKD sizing agent in pulp is 5-15 kg/ton paper; the dosage of the cationic polyacrylamide is 0.3-0.7 kg/ton of paper.
7. The method for producing the environment-friendly handbag paper as claimed in claim 1, which is characterized by comprising the following specific steps:
uniformly mixing bleached chemical softwood pulp, bleached chemical hardwood pulp and regenerated cellulose fibers in a mixed pulp tank, purifying by a pressure sieve, adding an AKD sizing agent and cationic polyacrylamide on line through a pipeline, pumping to a pre-papermaking tank, and making into paper by a papermaking machine;
drying the water content to be less than or equal to 5% in a pre-drying area of a paper machine, and coating 1.5-2.5g/m of diluted carboxyl styrene-butadiene latex mixed solution on the surface of a paper page through a surface sizing device 2 Is a latex of (2); drying the paper in a post-drying area until the water content is 4-6%, and forming a paper roll at a coiling part of the paper machine; finally, cutting the materials into different specifications and sizes according to the requirements, and packaging and warehousing the materials.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117777359A (en) * | 2023-12-26 | 2024-03-29 | 珠海金鸡化工有限公司 | High-strength carboxylic styrene-butadiene latex and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117777359A (en) * | 2023-12-26 | 2024-03-29 | 珠海金鸡化工有限公司 | High-strength carboxylic styrene-butadiene latex and preparation method thereof |
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