CN110924229A - Non-heat-sealing type tea filter paper with antibacterial property and production process thereof - Google Patents

Non-heat-sealing type tea filter paper with antibacterial property and production process thereof Download PDF

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Publication number
CN110924229A
CN110924229A CN201911202349.2A CN201911202349A CN110924229A CN 110924229 A CN110924229 A CN 110924229A CN 201911202349 A CN201911202349 A CN 201911202349A CN 110924229 A CN110924229 A CN 110924229A
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slurry
filter paper
heat
pulp
chitosan
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Inventor
颜鲁鸣
李南华
左磊刚
谢培鑫
何江
钟祥
郭婉
黄开庆
孔庾玲
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KAIEN SPECIAL MATERIALS CO Ltd ZHEJIANG
Zhejiang Kaine Special Paper Co Ltd
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KAIEN SPECIAL MATERIALS CO Ltd ZHEJIANG
Zhejiang Kaine Special Paper Co Ltd
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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
    • D21H27/08—Filter paper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D39/00—Filtering material for liquid or gaseous fluids
    • B01D39/14—Other self-supporting filtering material ; Other filtering material
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
    • 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
    • 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
    • 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
    • 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
    • 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
    • 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
    • D21H21/20—Wet strength 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
    • D21H21/36—Biocidal agents, e.g. fungicidal, bactericidal, insecticidal agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/04—Additives and treatments of the filtering material
    • B01D2239/0407—Additives and treatments of the filtering material comprising particulate additives, e.g. adsorbents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2239/00—Aspects relating to filtering material for liquid or gaseous fluids
    • B01D2239/10—Filtering material manufacturing

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  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Pest Control & Pesticides (AREA)
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Abstract

The invention discloses antibacterial non-heat-sealing tea filter paper and a production process thereof, wherein unbleached bleached wood pulp and pulped bleached wood pulp are used as main materials, and the unbleached bleached wood pulp is favorable for improving the thickness and the stiffness of the filter paper; meanwhile, the bleached wood pulp after pulping can improve the strength of paper. The chitosan has antibacterial and health-care functions, can effectively strengthen hydrogen bond combination among fibers after acting with the fibers, endows paper with good strength, adds the chitosan into the coating liquid, applies glue to the paper by adopting a mode of combining the carboxymethyl cellulose and the chitosan, endows the filter paper with certain antibacterial and health-care functions, and is also beneficial to improving the dry strength and the wet strength of the paper. The non-heat-sealing tea filter paper produced by the method of the invention can obviously reduce the production cost of the product, and simultaneously can ensure that the filter paper has higher strength and thickness, certain antibacterial property and health care function.

Description

Non-heat-sealing type tea filter paper with antibacterial property and production process thereof
Technical Field
The invention belongs to the technical field of filter paper, and particularly relates to antibacterial non-heat-sealing type tea filter paper and a production process thereof.
Background
Tea filter paper is one of important raw materials for producing tea bags and is divided into heat-sealing type tea filter paper and non-heat-sealing type tea filter paper. Compared with the traditional bulk tea, the tea bag has the advantages of convenient use and accurate quantification when drinking, and is widely popular in European and American countries.
The chitosan is a deacetylated product of chitin, and has great effects in preventing and treating atherosclerosis, hyperlipidemia, blood coagulation and anticoagulation in the field of medicine. Can reduce cholesterol concentration in serum and liver, and can be used as cholesterol lowering agent. The chitosan can strengthen liver function, prevent liver hangover due to excessive drinking, and adsorb and excrete heavy metals, toxins, pesticides, and chemical pigments remaining in the body. The chitosan can adjust the pH value in vivo to alkalescence, improve the utilization rate of insulin, and is beneficial to preventing and treating diabetes. In addition, it also has the functions of regulating endocrine system, normalizing insulin secretion, inhibiting blood sugar increase, and reducing blood lipid. Meanwhile, the chitosan and the derivatives thereof have better antibacterial activity and can inhibit the growth and the propagation of fungi, bacteria and viruses.
The tea filter paper is mainly used for inner packaging of tea, and the product is completely composed of plant fibers, so that the product has the characteristics of soft and uniform paper quality, high water filtration speed, no toxicity, no peculiar smell and biodegradability, and is a green and environment-friendly product which meets the food sanitation standard. Non-heat-seal type tealeaves filter paper seals through the mode that directly adopts mechanical pressure with two filter paper, and the paper is tight degree height, thickness are low, can lead to sealing the laminating not inseparable, seals and splits easily, and reduces the tight degree of filter paper, improves filter paper thickness, and filter paper laminates more firmly under the effect of mechanical pressure, and it seals also not splitting easily. Therefore, the non-heat-seal type tea filter paper is required to have a low tightness and a high thickness. In addition, the tea filter paper needs to have certain dry strength to ensure that the filter paper does not break in the subsequent processing process; certain wet strength is also required to ensure that the tea does not crack in the brewing process; the tea filter paper also needs to have certain stiffness so as to ensure that the tea filter paper is not easy to deform in the production process. At present, wood pulp and hemp pulp are generally adopted as raw materials of non-heat-seal tea leaf filter paper produced abroad, the proportion of the hemp pulp is usually over 40% in order to ensure that the filter paper has higher strength, thickness and stiffness, and the hemp pulp is expensive, so that the production cost of the product is higher. In addition, the current non-heat-sealing type tea filter paper is prepared by adopting plant fibers as raw materials and then coating, and the prepared tea filter paper has no antibacterial property because no antibacterial component is added.
The Chinese patent (application number: 201610333616.X) of the applicant discloses a method for making non-heat-sealing natural color tea filter paper by pure wood pulp, comprising the steps of firstly defibering unbleached wood pulp, and adjusting to a certain pulp concentration; and then laccase oxidation treatment is carried out, and then an adsorbent, a PAE wet strength agent and the like are added to finally obtain the non-heat-sealing natural-color tea filter paper. The Chinese patent of the applicant (application number: 201610333457.3) discloses a preparation method of pure wood pulp non-heat-sealing type tea filter paper, which comprises the steps of firstly defibering pulp obtained by mixing chlorine-free bleached wood pulp fiber and water; and then adding an adsorbent, a PAE wet strength agent, a reinforcing agent and the like for treatment to obtain the non-heat-sealing type tea filter paper. The Chinese patent application No. 201210379277.0 of the applicant discloses a method for manufacturing non-heat-sealing tea filter paper, which is characterized in that plant fibers are subjected to beating treatment, the beating degree is between 35 DEG SR and 45 DEG SR, the thermosetting reinforcing agent is added after full fibrillation, and then the raw paper finished product is manufactured through papermaking. The Chinese patent application number 201210181408.4 of the applicant discloses a production process of non-heat-sealing type tea filter paper, which adopts 67-73% and 27-33% of chlorine-free bleached softwood pulp board and manila hemp pulp board by mass percent respectively, and is prepared and formed through the working procedures of pulping, pulp blending, pulp flushing, net surfing and papermaking, dehydration, pre-drying, surface sizing and post-drying, quality control and rolling and packaging.
The existing production process of the tea filter paper mainly aims at reducing the cost and improving the strength of the filter paper, the thickness of the filter paper is not required, the performance has very important influence on the smoothness of subsequent packaging of tea, the tea filter paper generally requires higher thickness, and the tea can be smoothly sealed during packaging. Therefore, the tea filter paper should have a high thickness while reducing the cost and improving the strength. Meanwhile, the antibacterial component is added in the production process of the tea filter paper, so that the preservation time of the tea is also favorably prolonged.
Disclosure of Invention
The invention aims to provide a production process of non-heat-sealing tea filter paper with antibacterial property, which adopts wood pulp as a raw material and uses modified natural polymer material and chitosan for sizing, and the prepared non-heat-sealing tea filter paper has better strength, higher thickness and good antibacterial property.
In order to achieve the purpose, the invention adopts the following technical scheme: a non-heat-sealing tea filter paper with antibacterial property comprises the following components: based on the weight of the absolute dry weight,
60-90 parts of slurry A
10-40 parts of slurry B
Wherein: slurry A: is prepared by defibering bleached softwood pulp; slurry B: is prepared by beating part of the pulp A.
Preferably, the composition comprises the following components: based on the weight of the absolute dry weight,
60-70 parts of slurry A
30-40 parts of slurry B.
The production process of the antibacterial non-heat-sealing tea filter paper comprises the following steps:
1) defibering bleached softwood pulp to prepare pulp A with the concentration of 2.0-5.0%;
2) pulping a part of the pulp A by a double-disc grinder pulping machine to obtain pulp B, wherein the pulping degree is 40-80 DEG SR, and the wet weight is 3.0-15 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the mixed slurry C comprises 60-90 parts of slurry A, 10-40 parts of slurry B and 0.5-2.0% of mixed slurry C by absolute dry weight, and adding a PAE wet strength agent into the mixed slurry C, wherein the amount of the PAE wet strength agent is 1.0-8.0% of the absolute dry weight of the mixed slurry C;
4) adding one or more natural high polymer materials of carboxymethyl cellulose, hydroxy cellulose, oxidized starch, cationic starch, anionic starch and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.1-3.0%;
5) and forming the mixed slurry C by an inclined wire paper machine, wherein the wire concentration is 0.005-0.02%, drying the formed paper sheet by a drying cylinder, then coating by adopting a dipping mode, and then drying and rolling to obtain the non-heat-sealing type tea filter paper.
Preferably, the natural polymer materials used in step 4) are carboxymethyl cellulose and chitosan.
Preferably, the molecular weight of the chitosan is below 2000, and the ratio of the carboxymethyl cellulose to the chitosan is 2 in mass percent: 1-10: 1.
preferably, the ratio of carboxymethyl cellulose to chitosan is in the range of 3: 1-6: 1.
preferably, the drying cylinder in the step 5) is a Young drying cylinder, and the surface temperature of the drying cylinder is 100-160 ℃.
The unbleached bleached wood pulp and the pulped bleached wood pulp are used as main materials, and the unbleached bleached wood pulp is beneficial to improving the thickness and the stiffness of the filter paper; meanwhile, the bleached wood pulp after pulping can improve the strength of paper; the higher surface temperature of the drying cylinder ensures that the filter paper is dried quickly and is also beneficial to improving the thickness of the filter paper. The wet and dry strength of the filter paper can be further improved. The chitosan has antibacterial and health-care functions, can effectively strengthen hydrogen bond combination among fibers after acting with the fibers, endows paper with good strength, adds the chitosan into the coating liquid, applies glue to the paper by adopting a mode of combining the carboxymethyl cellulose and the chitosan, endows the filter paper with certain antibacterial and health-care functions, and is also beneficial to improving the dry strength and the wet strength of the paper. The non-heat-sealing tea filter paper produced by the method provided by the invention has the advantages that the production cost of the product is obviously reduced, meanwhile, the filter paper has higher strength and thickness, certain antibacterial performance and health care function, and the market prospect and the practical significance are great.
Drawings
FIG. 1 is a graph showing the antibacterial activity of Escherichia coli in reference example 2 and examples 1 to 4.
Detailed Description
The invention provides antibacterial non-heat-sealing tea filter paper and a production process thereof, wherein wood pulp is used as a raw material, and modified natural polymer material and chitosan are used for sizing, so that the prepared non-heat-sealing tea filter paper has good strength, high thickness and good antibacterial property, and has great market prospect and practical significance
The non-heat-sealing tea filter paper with antibacterial property comprises the following components: based on the weight of the absolute dry weight,
60-90 parts of slurry A
10-40 parts of slurry B
Wherein: slurry A: is prepared by defibering bleached softwood pulp; slurry B: is prepared by beating part of the pulp A.
Preferably, the antibacterial non-heat-sealing tea filter paper comprises the following components: based on the weight of the absolute dry weight,
60-70 parts of slurry A
30-40 parts of slurry B.
The production process of the antibacterial non-heat-sealing tea filter paper comprises the following steps:
1) defibering bleached softwood pulp to prepare pulp A with the concentration of 2.0-5.0%;
2) pulping a part of the pulp A by a double-disc grinder pulping machine to obtain pulp B, wherein the pulping degree is 40-80 DEG SR, and the wet weight is 3.0-15 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the mixed slurry C comprises 60-90 parts of slurry A, 10-40 parts of slurry B and 0.5-2.0% of mixed slurry C by absolute dry weight, and adding a PAE wet strength agent into the mixed slurry C, wherein the amount of the PAE wet strength agent is 1.0-8.0% of the absolute dry weight of the mixed slurry C;
4) adding one or more natural high polymer materials of carboxymethyl cellulose, hydroxy cellulose, oxidized starch, cationic starch, anionic starch and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.1-3.0%; preferably, the used natural polymer materials are carboxymethyl cellulose and chitosan, the molecular weight of the chitosan is below 2000, and the ratio of the carboxymethyl cellulose to the chitosan is 2 in mass percent: 1-10: 1, as a further preference, the ratio of carboxymethyl cellulose to chitosan is in the range of 3: 1-6: 1.
5) and forming the mixed slurry C by an inclined wire paper machine, wherein the wire concentration is 0.005-0.02%, drying the formed paper sheet by a drying cylinder, then coating by adopting a dipping mode, and then drying and rolling to obtain the non-heat-sealing type tea filter paper. Preferably, the drying cylinder is a Young drying cylinder, and the surface temperature of the drying cylinder is 100-160 ℃.
The specific reference examples and the examples of the production process of the antibacterial non-heat-sealing tea filter paper are as follows:
reference example 1
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 40 DEG SR, and the wet weight of the pulp B is 14 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 60 parts, the weight of the slurry B is 40 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) the mixed pulp is formed by an inclined net paper machine, the net surfing concentration is 0.005%, the formed paper sheet is dried and rolled by a drying cylinder to obtain the non-heat-sealing type tea filter paper, and the temperature of the drying cylinder is 140 ℃.
Reference example 2
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 40 DEG SR, and the wet weight of the pulp B is 14 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 60 parts, the weight of the slurry A is 40 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) adding carboxymethyl cellulose into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.5%;
5) the mixed pulp is formed by an inclined net paper machine, the net surfing concentration is 0.005%, the formed paper sheet is dried and rolled by a drying cylinder to obtain the non-heat-sealing type tea filter paper, and the temperature of the drying cylinder is 140 ℃.
Example 1
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 40 DEG SR, and the wet weight of the pulp B is 14 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 60 parts, the weight of the slurry B is 40 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) adding carboxymethyl cellulose and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.5%, wherein the weight ratio of the carboxymethyl cellulose to the chitosan is 8:1 according to absolute dry weight;
5) the mixed slurry is formed by an inclined wire paper machine, the wire concentration is 0.005 percent, the formed paper sheet is dried by a drying cylinder and is coated by dipping, and the coating weight is 0.6g/m2Then drying and rolling to obtain the non-heat-sealing type tea filter paper, wherein the temperature of a drying cylinder is 140 ℃.
Example 2
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 40 DEG SR, and the wet weight of the pulp B is 14 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 65 parts, the weight of the slurry B is 35 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) adding carboxymethyl cellulose and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.8%, wherein the weight ratio of the carboxymethyl cellulose to the chitosan is 6:1 according to absolute dry weight;
5) the mixed slurry is formed by an inclined wire paper machine, the wire concentration is 0.005 percent, the formed paper sheet is dried by a drying cylinder and is coated by dipping, and the coating weight is 0.6g/m2Then drying and rolling to obtain the non-heat-sealing type tea filter paper, wherein the temperature of a drying cylinder is 140 ℃.
Example 3
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 50 DEG SR, and the wet weight of the pulp B is 12 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 70 parts, the weight of the slurry B is 30 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) adding carboxymethyl cellulose and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 1.2%, wherein the weight ratio of the carboxymethyl cellulose to the chitosan is 6:1 according to absolute dry weight;
5) the mixed pulp is formed by an inclined wire paper machine, the wire concentration is 0.005 percent, the formed paper sheet is dried by a drying cylinder and is coated by dipping, and the coating weight is 0.8g/m2Then drying and rolling to obtain the non-heat-sealing type tea filter paper, wherein the temperature of a drying cylinder is 140 ℃.
Example 4
1) Defibering bleached softwood pulp to prepare pulp A with the concentration of 4.0%;
2) pulping part of the pulp A by a double-disc grinder pulping machine, wherein the pulp degree after pulping is 50 DEG SR, and the wet weight of the pulp B is 12 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the weight of the slurry A is 70 parts, the weight of the slurry A is 30 parts, the concentration of the mixed slurry C is 2.0%, and the PAE wet strength agent is added into the mixed slurry C, and the using amount of the PAE wet strength agent is 4.0% of the absolute dry weight of the mixed slurry C;
4) adding carboxymethyl cellulose and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 1.2%, wherein the weight ratio of the carboxymethyl cellulose to the chitosan is 3:1 according to absolute dry weight;
5) the mixed pulp is formed by an inclined wire paper machine, the wire concentration is 0.005 percent, the formed paper sheet is dried by a drying cylinder and is coated by dipping, and the coating weight is 0.8g/m2Then drying and rolling to obtain the non-heat-sealing type tea filter paper, wherein the temperature of a drying cylinder is 140 ℃.
The test data for each of the above-described reference examples and examples are as follows:
Figure BDA0002296181570000061
referring to fig. 1, fig. 1 shows the results of the antibacterial test on escherichia coli, wherein S0 is reference example 2, and S1, S2, S3 and S4 are example 1, example 2, example 3 and example 4, respectively.
As can be seen from fig. 1, there is no zone of inhibition around the sample containing only carboxymethyl cellulose, which indicates that the filter paper coated only with carboxymethyl cellulose has no antibacterial property, and after chitosan is added to the coating liquid, there is a zone of inhibition around the filter paper, which indicates that the filter paper has good antibacterial property after chitosan is added to the coating liquid.

Claims (7)

1. A non-heat-sealing tea filter paper with antibacterial property is characterized by comprising the following components: based on the weight of the absolute dry weight,
60-90 parts of slurry A
10-40 parts of slurry B
Wherein, the slurry A: is prepared by defibering bleached softwood pulp; slurry B: is prepared by beating part of the pulp A.
2. The antibacterial non-heat-seal type tea filter paper according to claim 1, wherein: comprises the following components: based on the weight of the absolute dry weight,
60-70 parts of slurry A
30-40 parts of slurry B.
3. A production process of the antibacterial non-heat-sealing tea leaf filter paper as claimed in any one of claims 1 to 2, characterized by comprising the following steps:
1) defibering bleached softwood pulp to prepare pulp A with the concentration of 2.0-5.0%;
2) pulping a part of the pulp A by a double-disc grinder pulping machine to obtain pulp B, wherein the pulping degree is 40-80 DEG SR, and the wet weight is 3.0-15 g;
3) mixing the slurry A and the slurry B to obtain mixed slurry C, wherein the mixed slurry C comprises 60-90 parts of slurry A, 10-40 parts of slurry B and 0.5-2.0% of mixed slurry C by absolute dry weight, and adding a PAE wet strength agent into the mixed slurry C, wherein the amount of the PAE wet strength agent is 1.0-8.0% of the absolute dry weight of the mixed slurry C;
4) adding one or more natural high polymer materials of carboxymethyl cellulose, hydroxy cellulose, oxidized starch, cationic starch, anionic starch and chitosan into water, stirring and dissolving to prepare a coating liquid with the concentration of 0.1-3.0%;
5) and forming the mixed slurry C by an inclined wire paper machine, wherein the wire concentration is 0.005-0.02%, drying the formed paper sheet by a drying cylinder, then coating by adopting a dipping mode, and then drying and rolling to obtain the non-heat-sealing type tea filter paper.
4. The process for producing antibacterial non-heat-sealing tea filter paper according to claim 3, wherein: the natural polymer materials used in the step 4) are carboxymethyl cellulose and chitosan.
5. The process for producing antibacterial non-heat-sealing tea filter paper according to claim 4, wherein: the molecular weight of the chitosan is below 2000, and the ratio of the carboxymethyl cellulose to the chitosan is 2 according to mass percent: 1-10: 1.
6. the process for producing antibacterial non-heat-sealing tea filter paper according to claim 5, wherein: the ratio of carboxymethyl cellulose to chitosan was 3: 1-6: 1.
7. the process for producing antibacterial non-heat-sealing tea filter paper according to claim 3, wherein: in the step 5), the drying cylinder is a Young drying cylinder, and the surface temperature of the drying cylinder is 100-160 ℃.
CN201911202349.2A 2019-11-29 2019-11-29 Non-heat-sealing type tea filter paper with antibacterial property and production process thereof Pending CN110924229A (en)

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