CN112575616A - Production method of high-strength high-air-permeability extensible packaging paper - Google Patents
Production method of high-strength high-air-permeability extensible packaging paper Download PDFInfo
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/10—Packing paper
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/30—Defibrating by other means
- D21B1/34—Kneading or mixing; Pulpers
- D21B1/345—Pulpers
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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
- 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
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/02—Drying on cylinders
- D21F5/04—Drying on cylinders on two or more drying cylinders
-
- 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
- D21H11/02—Chemical or chemomechanical or chemothermomechanical pulp
- D21H11/04—Kraft or sulfate pulp
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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
- 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
- D21H21/08—Dispersing agents for fibres
-
- 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
- D21H21/10—Retention agents or drainage improvers
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention belongs to the technical field of packaging paper production, and particularly relates to a production method of high-strength high-permeability flexible packaging paper.
Description
Technical Field
The invention belongs to the technical field of packaging paper production, and particularly relates to a production method of high-strength high-air-permeability extensible packaging paper.
Background
The paper packaging material has the characteristics of environmental protection, recycling, cost saving and the like, and is the preferred packaging material along with the increasing requirement of the whole international market on the environmental protection of the packaging materials. The paper products have wide raw material sources, low cost, various varieties and easy formation of mass production; the processing performance is good, the composite processing is convenient, and the printing performance is excellent; the device has certain mechanical part energy, light weight and good buffer parts; the sanitation and safety are good; the waste can be recycled, and white pollution is avoided. In view of the above advantages, the proportion of paper packaging materials in the packaging field is increasing. However, in order to meet the requirements of large-size, powdery and mechanical fast filling, the paper used for the packaging bag needs to have the properties of high strength, high air permeability, high toughness and the like.
During the packaging process of commodities such as cement, flour and the like, a large amount of air can be brought in by mechanical quick filling, if the commodities cannot be discharged in time, the problems of cracking, bag expansion and the like can occur in the subsequent loading, unloading and carrying processes after sealing, even the dangers of bag sliding and dumping can occur in the transportation process, and certain air permeability of paper is required; the weight of the individual products of such bulk packages is large, and the packages are required to have sufficient strength to ensure that the packages do not break during handling, wherein the paper is required to have high tensile, tear, and burst strength; when the contents are powder or particles, the shape plasticity is large, so that the packaging bag needs to have certain extensibility in order to adapt to the deformation of the contents, namely, the paper needs to have certain stretching effect when being stretched by external force, and the packaging bag has certain flexibility and toughness.
According to the requirements of packaging bags required by goods such as cement, flour and the like, the current technology is mainly realized by using high-quality long fibers, adjusting pulping concentration and beating degree, punching holes on processed paper bags, producing the paper bags by using an extensile device and the like. The long fiber pulp is used completely, the cost is high, the air permeability can be reduced, and the requirements of strength and air permeability can not be met simultaneously; the air permeability is improved by adopting a punching mode, the tissue pages are damaged, the strength is reduced, and the later processing cost is also improved; the stretching device is only helpful for improving the elongation of the paper and has little effect on improving the air permeability.
Disclosure of Invention
Aiming at the technical problems at present, the invention provides a production method of high-strength high-air-permeability flexible packaging paper, the packaging paper produced by the method has high strength, high air permeability and high flexibility, the requirements of the current packaging paper can be met, and the production cost is low and the process is simple.
The technical scheme of the invention is as follows:
a production method of high-strength high-air-permeability stretch wrapping paper comprises the following specific steps:
(1) mercerising treatment
Raw materials: bleaching softwood pulp and caustic soda by sulfate;
the process conditions are as follows: the alkali consumption is 18-22%, namely: the percentage of the weight of the pure NaOH to the weight of the absolutely dry wood pulp is 18 to 22 percent; the liquid ratio is 1: 8-1: 10, namely: the volume ratio (L) of the weight (kg) of the oven-dried wood pulp to the total liquid amount is 1: 8-1: 10; the treatment temperature is normal temperature;
the method comprises the following steps: adding caustic soda and water into a hydrapulper, starting stirring, adding sulfate to bleach softwood pulp, stopping stirring after the wood pulp is completely defibered, and standing and soaking for 20-30 min; starting a slurry pump, adding water on line to dilute the slurry to 3-5% of mass concentration, concentrating the slurry to 10-12% of concentration by a multi-disc concentrator to obtain mercerized slurry, and pumping the mercerized slurry to a slurry storage tank for later use by a medium concentration pump; wherein the purpose of concentration is to wash residual alkali;
the mercerized fiber is damaged to a certain degree, so that softwood pulp with longer fibers is used for ensuring the strength; the dosage and the processing time of the caustic soda are process parameters controlled according to the requirement of air permeability;
(2) slurry preparation
Raw materials: according to the mass percentage, 30-40% of long fiber pulp, 5-10% of mercerizing pulp and the balance of short fiber pulp; pulping process: the pulping concentration of the long fiber pulp is 4-5%, the beating degree is 20-23 DEG SR, and the wet weight is more than or equal to 9 g; short fiber pulp, the beating concentration is 5-6.5%, the beating degree is 40-45 degrees SR, and the wet weight is more than or equal to 1.2 g; mercerizing pulp without pulping;
long fiber pulp and short fiber pulp are only obtained by chemical pulping;
(3) papermaking process
Auxiliary materials: the dosage of the cationic polyacrylamide retention aid is 0.5-0.8 kg/ton paper, the dosage of the anionic aqueous polyurethane dispersion is 2-3 kg/ton paper, the dosage of the cationic starch is 8-10 kg/ton paper, and the dosage of the AKD sizing agent is 10-12 kg/ton paper; the dosage of the cassava native starch is 40-60 kg/ton paper, and the dosage of the anionic waterborne polyurethane emulsion is 4-6 kg/ton paper;
the addition amount of the auxiliary materials is set for ensuring the retention rate of the system and the physical index of the finished paper;
the process comprises the following steps: adding a cationic polyacrylamide retention aid, an anionic aqueous polyurethane dispersion, cationic starch and an AKD sizing agent into a proportioning pool, and feeding the mixture into a paper machine; the cassava native starch and the anionic waterborne polyurethane emulsion are used for surface sizing;
the preparation method of the surface sizing size comprises the following steps: diluting the cassava native starch to the mass concentration of 30-35%, adding amylase according to the proportion of 0.2-0.4 kg/ton cassava native starch, reacting for 30-40min, then performing high-temperature cooking at the temperature of 130 ℃ through 110-;
the technological parameters are as follows: a net part: and (3) the concentration of the internet: 0.8 to 1.2 percent; wire section pulp wire speed ratio: 100-110%, namely the slurry speed: the net speed is 100-110: 100;
a drying part: the tension of the dry net is 2-3KN/m, and the glue application amount is 1-5g/m2The paper tension of the sizing machine is 100-200N/m;
when the conventional printing paper is produced, the pulp speed is lower than the net speed, the pulp speed adopted by the invention is slightly higher than the net speed, the dragging of the forming net to the fiber is reduced, and the longitudinal and transverse differences of the fiber are reduced;
a first steam zone: 1# -7# drying cylinder, steam pressure is-10 to-75 KPa, and speed ratio is 0.98-0.99;
a second steam zone: an 8# -16# drying cylinder has steam pressure of 30-200 KPa and a speed ratio of 0.99-1.0;
a third steam zone: a No. 17-28 drying cylinder has steam pressure of 50-400 KPa and speed ratio of 1.0-1.1;
a fourth steam zone: a No. 29-39 drying cylinder, the steam pressure is 0-150 KPa, and the speed ratio is 1.0-1.1;
paper dryness of the drying part: 93-96 percent;
a calender part: the temperature of a calender roll is 60-70 ℃, and the linear pressure is 68-80 KN;
the drying cylinder speed ratio of the steam area refers to the ratio of the speed of the rear drying cylinder to the speed of the front drying cylinder in every two adjacent drying cylinders; when the printing paper and other varieties are produced conventionally, the speed of the rear drying cylinder in two adjacent drying cylinders is higher than that of the front drying cylinder, and in this case, the paper is pulled forward due to the difference of the current speeds, and the paper does not have the possibility of shrinkage; the parameters of the drying area of the invention are set that the speed of the rear drying cylinder is slightly less than that of the front drying cylinder, especially in the first and second steam areas with larger paper moisture, namely in the running process, the rear drying cylinder is slightly later than the front drying cylinder, so that the plastic paper with higher moisture content can be slightly rubbed, and the paper is slightly wrinkled, thus the paper has extensible potential; in order to ensure the normal operation of the equipment, the speed difference is not too large, otherwise, the paper can be folded in the third drying area and the fourth drying area where the moisture of the paper is reduced rapidly, and waste products are generated;
(4) coiling, slitting and warehousing
Preferably, the anionic aqueous polyurethane dispersion utilized in the present invention is an anionic aqueous polyurethane dispersion having a solid content of 50.0. + -. 1.5%, a pH of 7.0 to 9.0, and a viscosity of 20 to 1000mPa.s (25 ℃ C.), available from Wanhua chemical group, Inc
8407 anionic aliphatic polyester polyurethane dispersion.
Preferably, the anionic aqueous polyurethane emulsion has the solid content of 35.0 +/-1.5 percent and the pH value of 6.0-9.0, and is PU-3647 aqueous polyurethane which is available from Guangzhou Hunyyuke New Material Co.
Preferably, the long fiber in the long fiber pulp is one of bleached or unbleached softwood pulp, cotton pulp and bast fiber, and the fiber length is more than or equal to 4 mm. The long fibers act as a skeleton and the length thereof is secured as much as possible to improve the strength, and the upper limit of the length is controlled because the longer the fibers are, the worse the uniformity of the paper sheet is.
Preferably, the short fibers in the short fiber pulp are one of bleached or unbleached hardwood pulp, bamboo pulp, reed pulp and other non-wood fibers, and the fiber length is 1-4 mm. Short-staple thick liquid can reduce use cost on the one hand, improves the beating degree with high concentration beating when the beating, improves fibrous branch silk brooming degree, improves fibre joint point quantity, and the joint point is more, and is more firm, and network structure is more closely knit, and the reason of the length lower limit of control short-staple is that fibre length is too little easily runs off, remains poor.
Preferably, the aqueous caustic soda solution can be directly added into the process during mercerization treatment, and the aqueous caustic soda solution can be prepared and can also be directly obtained from the market.
The sulfate bleached softwood pulp, the long fiber pulp and the short fiber pulp can be obtained from the market.
The invention combines long and short fibers, the long fiber is pulped lightly, and the length is kept, so as to provide tearing strength; short fibers are beaten by sticky pulp, the brooming degree of devillicates is improved, the fiber binding points are increased, and the binding strength is improved, so that higher tensile strength and breaking strength are provided; a part of long fibers are treated independently and soaked in an alkaline solution to achieve a mercerizing effect, the long fibers become fibers with high air permeability, the fibers are added into the mixed slurry in proportion, the air permeability of finished paper is improved, the larger the amount of the mercerizing slurry is, the larger the air permeability is, but the strength of paper sheets is reduced, therefore, the inventor finally determines a certain addition amount through tests, the strength can be ensured, certain air permeability can be ensured, and the requirements of packaging paper are met. The invention combines the long fiber pulp, the short fiber pulp and the mercerized fiber pulp, thereby not only ensuring the strength of the finished paper, but also improving the air permeability of the finished paper.
According to the invention, in the papermaking process, an anionic aqueous polyurethane emulsion dispersoid and an anionic aqueous polyurethane emulsion are added, the anionic aqueous polyurethane emulsion dispersoid is added into the pulp, the anionic aqueous polyurethane emulsion dispersoid is fixed on fibers with negative charges through cationic polyacrylamide and cationic starch, and the fibers with negative charges and the anionic aqueous polyurethane are combined through bridging of a cationic high polymer to form a firm high-strength high-toughness network structure, so that the high toughness and high elongation of the paper are realized; the anionic waterborne polyurethane emulsion is added into the surface sizing solution, and is coated on the surface of paper by the film transfer sizing machine, and the surface has a barrier effect on water by utilizing the good film forming property of the surface, and has certain wet strength.
The mercerized pulp with high air permeability is added, so that the air permeability of the produced packaging paper is far higher than the standard requirement and the quality of like products in the market; the beating mode of the ingredients of retaining the length by light beating of long fibers and increasing the fiber combining points by devillicate fibrillation of short fibers is adopted, and the strength indexes are all greater than the standard requirement; by controlling the proportion of the mercerizing pulp to the long fiber pulp and the short fiber pulp, the produced packaging paper has the characteristics of high strength and high air permeability; because the waterborne polyurethane is used in the pulp and on the surface of the pulp, and a special process is matched, the obtained product has excellent performance on elongation indexes.
The invention provides a production method of high-strength high-air-permeability high-extensibility packing paper, the packing paper produced by the method has high strength, high air permeability and high extensibility, can meet the requirements of the existing packing paper, and has low production cost and simple process.
Detailed Description
The present invention will be described in further detail with reference to the following examples, but it should not be construed that the scope of the above subject matter is limited to the following examples. All the technologies realized based on the above contents of the present invention belong to the scope of the present invention, and the following embodiments are all completed by adopting the conventional prior art except for the specific description.
The anionic aqueous polyurethane dispersions obtained in the examples below are those available from Vanhua chemical group, Inc
8407 anionic aliphatic polyester polyurethane dispersion; an anionic aqueous polyurethane emulsion; PU-3647 waterborne polyurethane available from Guangzhou Henry New Material Co.
Example 1
A production method of high-strength high-air-permeability stretch wrapping paper comprises the following steps:
(1) mercerising treatment
Raw materials: bleaching softwood pulp and caustic soda by sulfate;
the process conditions are as follows: the alkali consumption is 20 percent, namely 20kg of soda ash is used for every 100kg of oven-dried wood pulp; liquid ratio: 1:10, namely: the volume ratio (L) of the weight (kg) of the oven-dried wood pulp to the total liquid amount is 1: 8-1: 10; the treatment temperature is normal temperature;
the method comprises the following steps: adding industrial caustic soda and water into a hydrapulper, starting stirring, adding a wood pulp board, stopping stirring after the pulp board is completely fluffed, and standing and soaking for 25 min; starting a slurry extracting pump, adding water on line to dilute to 4%, concentrating to 11% concentration by a multi-disc concentrator to obtain mercerized slurry, and pumping to a slurry storage tank for later use by a medium concentration pump;
(2) slurry preparation
Raw materials: according to the mass percentage, 40% of sulfate bleached softwood pulp, 10% of mercerized pulp and 50% of sulfate bleached hardwood pulp; sulfate bleached softwood pulp with the fiber length being more than or equal to 4mm, and sulfate bleached hardwood pulp with the fiber length being 1-4 mm;
pulping process: bleaching softwood pulp by sulfate, wherein the pulping concentration is 4.5%, the beating degree is 20-23 DEG SR, and the wet weight is more than or equal to 9 g; bleaching broad-leaved wood pulp by sulfate, wherein the pulping concentration is 5.5 percent, the beating degree is 40-45 DEG SR, and the wet weight is more than or equal to 1.2 g; mercerizing pulp without pulping;
(3) papermaking process
Auxiliary materials: the dosage of the cationic polyacrylamide retention aid is 0.7 kg/ton paper, the dosage of the anionic aqueous polyurethane dispersion is 2.5 kg/ton paper, the dosage of the cationic starch is 9 kg/ton paper, the dosage of the AKD sizing agent is 11 kg/ton paper, the dosage of the cassava native starch is 55 kg/ton paper, and the dosage of the anionic aqueous polyurethane emulsion is 5 kg/ton paper;
the process comprises the following steps: adding a cationic polyacrylamide retention aid, an anionic aqueous polyurethane dispersion, cationic starch and an AKD sizing agent into a proportioning pool, and feeding the mixture into a paper machine; the cassava native starch and the anionic waterborne polyurethane emulsion are used for surface sizing;
the preparation method of the surface sizing size comprises the following steps: diluting the cassava native starch to 30% of concentration, adding amylase according to the proportion of 0.2 kg/ton of starch, reacting for 40min, cooking at the high temperature of 110-130 ℃, diluting to 11% of concentration, mixing with the anionic waterborne polyurethane emulsion after dilution, mixing uniformly, and adding into a paper machine system;
the technological parameters are as follows: a net part: the concentration of the on-line is 1.0 percent; wire section pulp wire speed ratio 110%, i.e. pulp speed: the speed of the network is 110: 100; a drying part: the tension of a dry net is 2-3KN/m, and the glue application amount is 5g/m2Paper tension of sizing machine of 100-
A first steam zone: 1# -7# drying cylinder, steam pressure of-10 to-75 KPa, speed ratio of 0.99
A second steam zone: 8# -16# drying cylinder, steam pressure of 30-200 KPa, speed ratio of 0.99
A third steam zone: a No. 17-28 drying cylinder, the steam pressure is 50-400 KPa, and the speed ratio is 1.0
A fourth steam zone: 29# -39# drying cylinder, steam pressure of 0-150 KPa, speed ratio of 1.1
Paper dryness of the drying part: 96 percent;
a calender part: the calender roll temperature is 60-70 ℃, and the linear pressure is 68-80KN
(4) Coiling, cutting and warehousing.
Example 2
Production method of high-strength high-air-permeability extensible packaging paper
(1) Mercerising treatment
Raw materials: bleaching softwood pulp and caustic soda by sulfate;
the process comprises the following steps: the alkali consumption is 18 percent, namely, 18kg of soda ash is used for every 100kg of oven-dried wood pulp; liquid ratio: 1:8, i.e. the volume ratio (L) of the weight (kg) of the oven dried wood pulp to the total liquid amount is 1: 8; the treatment temperature is normal temperature;
the method comprises the following steps: adding industrial caustic soda and water into a hydrapulper in proportion, starting stirring, adding a wood pulp plate, stopping stirring after the pulp plate is completely fluffed, and standing and soaking for 30 min; starting a pulp extracting pump, adding water on line to dilute the pulp to 5%, concentrating the pulp to a concentration of 12% by a multi-disc concentrator to obtain mercerized pulp, and pumping the mercerized pulp to a pulp storage tank for later use by a medium concentration pump;
(2) slurry preparation
Raw materials: according to the mass percentage, the unbleached alkali softwood pulp accounts for 35 percent, the unbleached alkali bamboo pulp accounts for 60 percent, and the mercerizing pulp accounts for 5 percent; sulfate bleached softwood pulp with the fiber length being more than or equal to 4mm, and sulfate bleached hardwood pulp with the fiber length being 1-4 mm;
pulping process: the non-bleaching alkali method softwood pulp has the pulping concentration of 4 percent, the beating degree of 20-23 DEG SR and the wet weight of more than or equal to 9 g; 60% of unbleached alkali bamboo pulp, the pulping concentration of 6.5%, the beating degree of 40-45 DEG SR, and the wet weight of more than or equal to 1.2 g; mercerizing pulp without pulping;
(3) papermaking process
Auxiliary materials: the dosage of the cationic polyacrylamide retention aid is 0.8 kg/ton paper, the dosage of the anionic aqueous polyurethane dispersion is 2 kg/ton paper, the dosage of the cationic starch is 8 kg/ton paper, the dosage of the AKD sizing agent is 12 kg/ton paper, the dosage of the cassava native starch is 60 kg/ton paper, and the dosage of the anionic aqueous polyurethane emulsion is 6 kg/ton paper;
the process comprises the following steps: adding a cationic polyacrylamide retention aid, an anionic aqueous polyurethane dispersion, cationic starch and an AKD sizing agent into a pulp blending pool according to a predetermined dosage, and feeding the pulp into a paper machine; the cassava native starch and the anionic waterborne polyurethane emulsion are used for surface sizing;
the preparation method of the surface sizing size comprises the following steps: diluting the cassava native starch to 32% concentration, adding amylase according to the proportion of 0.3 kg/ton starch, reacting for 35min, then performing high-temperature cooking at the temperature of 110-;
the technological parameters are as follows: a net part: the concentration of the on-line is 1.2%; wire section pulp wire speed ratio 100%, i.e. pulp speed: the speed of the net is 100: 100;
a drying part: the tension of a dry net is 2-3KN/m, and the glue application amount is 1g/m2Paper tension of sizing machine of 100-
A first steam zone: 1# -7# drying cylinder, steam pressure of-10 to-75 KPa, speed ratio of 0.98
A second steam zone: 8# -16# drying cylinder, steam pressure of 30-200 KPa, speed ratio of 1.0
A third steam zone: a No. 17-28 drying cylinder, the steam pressure is 50-400 KPa, and the speed ratio is 1.1
A fourth steam zone: 29# -39# drying cylinder, steam pressure of 0-150 KPa, speed ratio of 1.0
Paper dryness of the drying part: 93 percent;
a calender part: the temperature of a calender roll is 60-70 ℃, and the linear pressure is 68-80 KN;
(4) coiling, cutting and warehousing.
Example 3
Production method of high-strength high-air-permeability extensible packaging paper
(1) Mercerising treatment
Raw materials: bleaching softwood pulp and caustic soda by sulfate;
the process comprises the following steps: the alkali consumption is 22 percent, namely 22kg of soda ash is used for every 100kg of oven-dried wood pulp; liquid ratio: 1:9, i.e. the volume ratio (L) of the weight (kg) of the oven dried wood pulp to the total liquid amount is 1: 9; the treatment temperature is normal temperature;
the method comprises the following steps: adding caustic soda and water into a hydrapulper, starting stirring, adding a wood pulp board, stirring until the pulp board is completely fluffed, stopping stirring, standing and soaking for 20 min; starting a pulp extracting pump, adding water on line to dilute the pulp to 3%, concentrating the pulp to a concentration of 10% by a multi-disc concentrator to obtain mercerized pulp, and pumping the mercerized pulp to a pulp storage tank for later use by a medium concentration pump;
(2) slurry preparation
Raw materials comprise 30 percent of unbleached sulfate-process softwood pulp, 55 percent of unbleached alkali-process reed pulp and 15 percent of mercerizing pulp by mass percent; sulfate bleached softwood pulp with the fiber length being more than or equal to 4mm, and sulfate bleached hardwood pulp with the fiber length being 1-4 mm;
pulping process: unbleached sulfate process softwood pulp, the pulping concentration is 5%, the beating degree is 20-23 DEG SR, and the wet weight is more than or equal to 9 g; the method comprises the following steps of (1) pulping reed pulp by an unbleached alkali method, wherein the pulping concentration is 5%, the beating degree is 40-45 DEG SR, and the wet weight is more than or equal to 1.2 g; mercerizing pulp without pulping;
(3) papermaking process
Auxiliary materials: the dosage of the cationic polyacrylamide retention aid is 0.5 kg/ton paper, the dosage of the anionic aqueous polyurethane dispersion is 3 kg/ton paper, the dosage of the cationic starch is 10 kg/ton paper, the dosage of the AKD sizing agent is 10 kg/ton paper, the dosage of the cassava native starch is 40 kg/ton paper, and the dosage of the anionic aqueous polyurethane emulsion is 4 kg/ton paper;
the process comprises the following steps: adding a cationic polyacrylamide retention aid, an anionic aqueous polyurethane dispersion, cationic starch and an AKD sizing agent into a pulp blending pool according to a predetermined dosage, and feeding the pulp into a paper machine; the cassava native starch and the anionic waterborne polyurethane emulsion are used for surface sizing;
the preparation method of the surface sizing size comprises the following steps: diluting the cassava native starch to 35% of concentration, adding amylase according to the proportion of 0.4 kg/ton of starch, reacting for 30min, then performing high-temperature cooking at the temperature of 110-;
the technological parameters are as follows: a net part: the concentration of the on-line is 0.8%; wire section pulp wire speed ratio 105%; namely the pulp speed: the web speed is 105: 100; a drying part: the tension of a dry net is 2-3KN/m, and the glue application amount is 3g/m2The paper tension of the sizing machine is 100-200N/m;
a first steam zone: 1# -7# drying cylinder, steam pressure of-10 to-75 KPa, speed ratio of 0.99
A second steam zone: 8# -16# drying cylinder, steam pressure of 30-200 KPa, speed ratio of 1.0
A third steam zone: a No. 17-28 drying cylinder, the steam pressure is 50-400 KPa, and the speed ratio is 1.1
A fourth steam zone: 29# -39# drying cylinder, steam pressure of 0-150 KPa, speed ratio of 1.0
Paper dryness of the drying part: 94 percent;
a calender part: the calender roll temperature is 60-70 ℃, and the linear pressure is 68-80KN
(4) Coiling, cutting and warehousing.
The quality indexes of the high-strength high-permeability stretch packaging paper prepared in the above examples 1 to 3, and GB/T24287-2009 stretch paper bag paper, GB/T24287-2009 semi-stretch paper bag paper, market paper bag paper sample 1, and market paper bag paper sample 2 are as follows:
as is apparent from the above table, the air permeability, longitudinal elongation, longitudinal tensile energy absorption, and transverse tensile energy absorption of the wrapping paper produced in examples 1 to 3 are significantly higher than those of the international paper bag paper, the international semi-extensible paper bag paper, and similar products in the market; the longitudinal tear index, the longitudinal tensile index and the transverse tensile index of the packaging paper produced in the examples 1 to 3 are obviously higher than those of the national standard extensible paper bags and the national standard semi-extensible paper bags, and are equivalent to similar products in the market. Because the mercerized pulp with high air permeability is added, the air permeability of the produced packaging paper is far higher than the standard requirement and the quality of like products in the market; the beating mode of the ingredients of retaining the length by light beating of long fibers and increasing the fiber combining points by devillicate fibrillation of short fibers is adopted, and the strength indexes are all greater than the standard requirement; by controlling the proportion of the mercerizing pulp to the long fiber pulp and the short fiber pulp, the produced packaging paper has the characteristics of high strength and high air permeability; because the water-based polyurethane is used in the pulp and on the surface of the pulp, and a special process is matched, the product has excellent performance on elongation indexes.
Claims (7)
1. A production method of high-strength high-air-permeability stretch wrapping paper is characterized by comprising the following specific steps:
(1) mercerising treatment
Raw materials: bleaching softwood pulp and caustic soda by sulfate;
the process conditions are as follows: the alkali consumption is 18-22%, the liquid ratio is 1: 8-1: 10, and the treatment temperature is normal temperature;
the method comprises the following steps: adding caustic soda and water into hydrapulper, stirring, adding sulfate to bleach softwood pulp, stirring until the wood pulp is completely defibered, stopping stirring, standing and soaking for 20-30 min; starting a slurry pump, adding water on line to dilute the slurry to 3-5% of mass concentration, concentrating the slurry to 10-12% of concentration by a multi-disc concentrator to obtain mercerized slurry, and pumping the mercerized slurry to a slurry storage tank for later use by a medium concentration pump;
(2) slurry preparation
Raw materials: according to the mass percentage, 30-40% of long fiber pulp, 5-10% of mercerizing pulp and the balance of short fiber pulp;
pulping process: the pulping concentration of the long fiber pulp is 4-5%, the beating degree is 20-23 DEG SR, and the wet weight is more than or equal to 9 g; short fiber pulp, the beating concentration is 5-6.5%, the beating degree is 40-45 degrees SR, and the wet weight is more than or equal to 1.2 g; the mercerized pulp is not pulped;
(3) the papermaking process comprises the following steps:
auxiliary materials: the dosage of the cationic polyacrylamide retention aid is 0.5-0.8 kg/ton paper, the dosage of the anionic aqueous polyurethane dispersion is 2-3 kg/ton paper, the dosage of the cationic starch is 8-10 kg/ton paper, the dosage of the AKD sizing agent is 10-12 kg/ton paper, the dosage of the cassava native starch is 40-60 kg/ton paper, and the dosage of the anionic aqueous polyurethane emulsion is 4-6 kg/ton paper;
the process comprises the following steps: adding a cationic polyacrylamide retention aid, an anionic aqueous polyurethane dispersion, cationic starch and an AKD sizing agent into a proportioning pool, and feeding the mixture into a paper machine; the cassava native starch and the anionic waterborne polyurethane emulsion are used for surface sizing;
the preparation method of the surface sizing size comprises the following steps: diluting the cassava native starch to the mass concentration of 30-35%, adding amylase according to the proportion of 0.2-0.4 kg/ton cassava native starch, reacting for 30-40min, then performing high-temperature cooking at the temperature of 130 ℃ through 110-;
the technological parameters are as follows: a net part: and (3) the concentration of the internet: 0.8 to 1.2 percent; wire section pulp wire speed ratio: 100-110%, namely the slurry speed: the net speed is 100-110: 100;
a drying part: the tension of the dry net is 2-3KN/m, and the glue application amount is 1-5g/m2The paper tension of the sizing machine is 100-200N/m;
a first steam zone: 1# -7# drying cylinder, steam pressure is-10 to-75 KPa, and speed ratio is 0.98-0.99;
a second steam zone: an 8# -16# drying cylinder has steam pressure of 30-200 KPa and a speed ratio of 0.99-1.0;
a third steam zone: a No. 17-28 drying cylinder has steam pressure of 50-400 KPa and speed ratio of 1.0-1.1;
a fourth steam zone: a No. 29-39 drying cylinder, the steam pressure is 0-150 KPa, and the speed ratio is 1.0-1.1;
paper dryness of the drying part: 93-96 percent;
a calender part: the temperature of a calender roll is 60-70 ℃, and the linear pressure is 68-80 KN;
(4) coiling, cutting and warehousing.
2. A method for producing a high strength, high air permeability and elongation packing paper as claimed in claim 1, wherein said anionic aqueous polyurethane dispersion has a solid content of 50.0 ± 1.5%, a PH of 7.0-9.0, and a viscosity of 20-1000 mpa.s.
3. The method for producing high-strength high-air-permeability flexible packaging paper as claimed in claim 1, wherein the anionic aqueous polyurethane emulsion has a solid content of 35.0 ± 1.5% and a pH value of 6.0-9.0.
4. The method for producing high-strength high-permeability flexible packaging paper according to claim 1, wherein the long fibers in the long fiber pulp are one of bleached or unbleached softwood pulp, cotton pulp and bast fibers, and the fiber length is more than or equal to 4 mm.
5. A method for producing high strength and high air permeability stretch wrapping paper according to claim 1, wherein the short fibers in the short fiber pulp are one of bleached or unbleached hardwood pulp, bamboo pulp and reed pulp, and the fiber length is 1-4 mm.
6. A method for producing a high strength and high air permeability stretch wrapper according to claim 1 wherein said amount of alkali is 18-22% by weight of NaOH in a percentage of 18-22% by weight of oven dry wood pulp.
7. The production method of the high-strength high-air-permeability stretch wrapping paper according to claim 1, wherein the liquid ratio is 1: 8-1: 10, namely: the volume ratio of the weight of the oven-dried wood pulp to the total liquid amount is 1: 8-1: 10.
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