CN114790666A - High-stiffness straw base paper and preparation method thereof - Google Patents
High-stiffness straw base paper and preparation method thereof Download PDFInfo
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- CN114790666A CN114790666A CN202210396785.3A CN202210396785A CN114790666A CN 114790666 A CN114790666 A CN 114790666A CN 202210396785 A CN202210396785 A CN 202210396785A CN 114790666 A CN114790666 A CN 114790666A
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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
- 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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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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
- 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
- D21H17/17—Ketenes, e.g. ketene dimers
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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
- 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
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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
- 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
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/36—Polyalkenyalcohols; Polyalkenylethers; Polyalkenylesters
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
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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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
- D21H17/68—Water-insoluble compounds, e.g. fillers, pigments siliceous, e.g. clays
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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
- D21H19/00—Coated paper; Coating material
- D21H19/10—Coatings without pigments
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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
- D21H21/14—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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- 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
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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
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/22—Addition to the formed paper
- D21H23/52—Addition to the formed paper by contacting paper with a device carrying the material
- D21H23/56—Rolls
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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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- Chemical & Material Sciences (AREA)
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- General Chemical & Material Sciences (AREA)
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Abstract
The invention relates to the technical field of paper industry, in particular to high-stiffness straw base paper and a preparation method thereof. The preparation method of the high-stiffness straw base paper comprises the steps of mixing and pulping bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bamboo pulp to obtain wood pulp; sequentially adding cationic cassava starch, a wet strength agent, AKD, aluminum sulfate and silica sol into wood pulp, uniformly mixing, and preparing base paper by a fourdrinier vat paper machine; and then mixing the cassava starch on the amphoteric surface, polyvinyl alcohol, chitosan, surface AKD, sodium silicate and water to form surface glue, and coating the front side and the back side of the base paper by a film transfer sizing machine to obtain the base paper of the high-stiffness straw. The invention emphasizes on improving the stiffness of the straw base paper from the aspects of pulp board selection, surface glue formula, chemical auxiliary materials and the like, and the stiffness of the produced straw base paper is increased by 20-30% on the basis of the stiffness of the current commercially available base paper.
Description
Technical Field
The invention relates to the technical field of paper industry, in particular to high-stiffness straw base paper and a preparation method thereof.
Background
Patent CN201910163345.1 discloses a manufacturing method of straw body paper, the proportion of bleached sulfate hardwood pulp and bleached sulfate softwood pulp is controlled, two kinds of wood pulp are independently beaten, corresponding beating concentration, beating degree and wet weight are controlled, the retention rate of a paper machine is improved by adding a biopolymer, the fiber binding force of the paper is enhanced, the strength index of the paper is increased, a Yankee cylinder with the diameter of 3 meters is used on the paper machine to shape the paper in a wet part, the transverse deformation of the paper at a subsequent part is reduced, and the surface fineness of the paper is improved. When the raw materials are selected, the Yinxing pulp board and the Senbo mixed eucalyptus pulp board are mixed, and the produced straw base paper still has the characteristic of poor stiffness, so that the market requirement of the existing straw paper is difficult to meet.
Patent CN201910471036.0 discloses a method for making paper for drinking straw, which comprises the steps of pulping, pulp blending, auxiliary material adding, wet paper making, pre-drying, surface sizing, post-drying, press polishing and reeling, wherein chlorine-free bleached sulfate softwood pulp and chlorine-free bleached sulfate hardwood pulp are used as fiber raw materials for making, and the raw materials do not contain toxic chemical components such as organic chloride, and are environment-friendly, sanitary and harmless to human body. The product has the advantages of good dry strength, no paper breakage, high wet strength, good moisture resistance, rapid degradation, environmental protection, and compliance with the paper hygiene requirements for food. But it only discloses a conventional straw paper preparation process, and does not solve the problem of poor water immersion stiffness of the paper straw.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the raw paper for the high-stiffness straw is provided, the problem that the paper straw is poor in water immersion stiffness is solved, and better use experience is provided for consumers; the invention also provides a preparation method of the composition.
The preparation method of the base paper for the high-stiffness suction pipe comprises the following steps:
(1) grinding: uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bamboo pulp according to a ratio, and pulping in series by using three DD720 double disc mills, wherein the first disc mill uses a cutting fin-shaped grinding sheet, the second disc mill and the third disc mill use a broom fin-shaped grinding sheet to obtain wood pulp, the beating degree is 24-28 DEG SR, and the wet weight is 5-7 g;
(2) papermaking: sequentially adding cationic tapioca starch, a wet strength agent, AKD, aluminum sulfate and silica sol into wood pulp, uniformly mixing, and preparing base paper by a fourdrinier vat paper machine;
(3) preparing surface glue: uniformly stirring amphoteric surface tapioca starch and polyvinyl alcohol in a formula amount and water in a formula amount of 1/3-1/2 in a surface glue cooking tank, introducing steam, heating to 90-100 ℃, preserving heat for 15-25min, extracting the mixture into a surface glue diluting bucket, mixing the mixture with chitosan, surface AKD, sodium silicate and water in the formula amount to form surface glue, and extracting the surface glue into a surface glue storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness straw base paper, wherein the types of the front side measuring rod and the back side measuring rod are V30, the linear pressure is 20-25kN/m, and the coating weight is 1.5-2g/m 2 。
In the step (1) of the invention, the wood pulp consists of 30-40% of bleached sulfate softwood pulp, 50-60% of bleached sulfate hardwood pulp and 5-15% of bamboo pulp.
The bleached sulfate softwood pulp is preferably Arabama softwood pulp; the bleached sulfate hardwood pulp is preferably carabine hardwood pulp; the bamboo pulp is selected from normal commercially available bamboo pulp.
In step (2) of the invention, the operation parameters of the fourdrinier vat paper machine are as follows: the vehicle speed is 200-.
The addition amount of the AKD is 20-25 kg/ton pulp; AKD is preferably kemiraKD324TP, manufactured by Kalima. The addition of AKD can ensure that the water absorption degree of the cured paper sheet is in a proper range, and generally 25-35g/m is required 2 In the range, the pipe-drawing paper cannot absorb water too fast or too slow, and the subsequent glue-coating pipe-drawing operation of manufacturers is facilitated.
The addition amount of the cationic tapioca starch is 16-25 kg/ton pulp; the cationic starch is preferably a conventional commercial product having a degree of substitution of 0.03. The cationic tapioca starch has the functions of improving the binding force of paper sheet fibers and improving the paper sheet strength, and the tensile strength can be reduced by 10-20% without adding.
The adding amount of the silica sol is 2-4 kg/ton pulp; the silica sol is mainly composed of silicon dioxide, and the preferred manufacturer is Zhejiang Huayan chemical Co. The silica sol is used as an anion assistant agent and is used behind a pressure screen, so that various chemical industries, particularly the retention of wet strength agents, are improved, the addition amount of the wet strength agents is reduced, the chloropropanol content is prevented from exceeding the standard, and the strength is reduced by 20-30% if the wet strength is not increased.
The addition amount of the wet strength agent is 8-12 kg/ton pulp; the main component of the wet strength agent is polyamide polyamine epichlorohydrin, and the preferred manufacturer is Japanese chestnut field water treatment new material Co. The wet strength agent is used for improving the wet strength of the paper sheet, and further preventing the strength of a paper straw from being reduced too fast after the paper straw is rolled, and the wet strength of the paper sheet is not reduced by 50%.
The addition amount of the aluminum sulfate is 8-12 kg/ton pulp; aluminum sulfate content of aluminum sulfate is more than or equal to 16 percent, Fe 2 O 3 The content is less than or equal to 0.5 percent, and is a conventional commercial product. The aluminum sulfate is used as a cation assistant and is used for improving the paper stiffness, and the paper stiffness is not reduced by 10-15%.
In the step (3), the surface adhesive comprises the following raw materials in parts by weight:
the preferable model of the amphoteric surface cassava starch is LS-2, and the manufacturers are Jiangxi Hei and chemical industry Co. The amphoteric surface tapioca starch is used for improving the surface strength of paper sheets, reducing hair and powder falling and serving as carriers of other surface reinforcing agents and surface sizing agents.
The polyvinyl alcohol is preferably 1799 in model number, and the manufacturer is Anhui Wei group Limited liability company, Anhui province, China. Polyvinyl alcohol is used to increase the sheet surface strength.
The chitosan is preferably CK-5525, and the manufacturer is Linyi Sanshui science and technology Co. The chitosan functions to increase the sheet surface strength.
The surface AKD is preferably a commercial product with the solid content of 30 percent, and the manufacturer is Zhejiang-handed Huayang Co. The surface AKD is used for improving the water resistance of the surface of the paper sheet and improving the wet friction performance of the paper sheet.
The sodium silicate is preferably a commercially available conventional product having a solids content of 30%, a pH of 8-10, and a viscosity (25 ℃) of < 30 mPa.s. The sodium silicate acts to increase sheet stiffness and does not reduce sheet stiffness.
The solid content of the surface adhesive prepared in the step (3) is 14 +/-1%, the temperature is 65-70 ℃, the viscosity is 15-20mpa · s, and the pH is 5-6.
In the step (4) of the invention, the paper dryness of the base paper before entering the film transfer sizing machine is more than or equal to 90 percent, and the paper dryness of the base paper after exiting the film transfer sizing machine is more than or equal to 70 percent.
The preparation method is used for producing the straw body paper, and the paper smoothness is not required intentionally, so the calendaring is not needed, the calendaring can increase and reduce the paper thickness and the paper stiffness, and the paper is too smooth, thereby being not beneficial to the subsequent gluing and pipe coiling operation.
The invention also provides the raw paper for the high-stiffness suction pipe, which is prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) the Alabama softwood pulp adopted by the invention has large fiber thickness, wall thickness, small fiber winding degree and large stiffness, is compounded with bleached sulfate hardwood pulp and bamboo pulp, and can obviously improve the stiffness of the straw base paper by using aluminum sulfate and other auxiliaries, and the stiffness of the produced straw base paper is increased by 20-30% on the basis of the stiffness of the current commercially available base paper;
(2) the stiffness of the raw paper of the straw is improved mainly in the aspects of pulp board selection, surface sizing formula, chemical auxiliary materials and the like, and the stiffness of the raw paper of the straw is obviously improved by compounding the sodium silicate in surface sizing as an important stiffness agent with other raw materials.
Drawings
FIG. 1 is a flow chart of a production process of the high stiffness raw paper for the straw of the invention;
FIG. 2 is a flow chart of the surface glue preparing apparatus according to the present invention;
in the figure, 1, a surface glue cooking pot; 2. a surface glue diluting tank; 3. a surface glue storage tank; 4. a material tank is glued on the surface; 5. and (4) a film transfer sizing machine.
Detailed Description
The present invention is further illustrated by the following examples, wherein unless otherwise indicated, all technical methods used are conventional methods known in the art, all starting materials used are commercially available products, and the parts are by weight.
Wherein, AKD: kemiraKD324TP, manufacturer Kemira.
Cationic starch: conventional commercial product having a degree of substitution of 0.03.
Silica sol: the main component is silicon dioxide, and the manufacturer is Zhejiang Huayang chemical company Limited.
Wet strength agent: the main component is polyamide polyamine epichlorohydrin, and the manufacturers are Japan chestnut field water treatment new material company Limited.
Aluminum sulfate: the content of aluminum sulfate is more than or equal to 16 percent, Fe 2 O 3 The content is less than or equal to 0.5 percent, and the product is a conventional commercial product.
Amphoteric surface tapioca starch: LS-2, manufacturer Jiangxi and chemical industry Co.
Polyvinyl alcohol: 1799, and manufacturers Anhui Wei group Limited liability company.
And (3) chitosan: CK-5525, Producer Linyi Sanshui science and technology, Inc.
Surface AKD: the solid content is 30 percent, and the manufacturer is Zhejiang China chemical Limited company.
Sodium silicate: 30% of solid content, 8-10 of PH, and less than 30 mpa.s of viscosity (25 ℃).
Example 1
(1) Grinding: uniformly mixing 35% of Arabama softwood pulp, 55% of Cara hardwood pulp and 10% of bamboo pulp, and pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin-type grinding disc, the second disc mill and the third disc mill adopt a broom fin-type grinding disc to obtain wood pulp, the beating degree is 26 degrees SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 10kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, keeping the temperature for 20min, extracting the mixture to a surface glue dilution barrel, mixing the mixture with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue to a surface glue stock storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness suction pipe base paper, wherein the models of the front side metering rod and the back side metering rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.8g/m 2 The coating temperature is 65 ℃, the paper dryness of the base paper before entering the film transfer sizing machine is 92 percent, and the paper dryness of the base paper after exiting the film transfer sizing machine is 75 percent.
Example 2
(1) Grinding: uniformly mixing 30% of Arabama softwood pulp, 55% of Kara hardwood pulp and 5% of bamboo pulp, and pulping in series by adopting three DD720 double disc mills, wherein the first disc mill adopts a cutting fin-type grinding disc, the second disc mill and the third disc mill adopt a broom fin-type grinding disc to obtain wood pulp, the beating degree is 26 degrees SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 10kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, preserving heat for 20min, extracting the mixture into a surface glue diluting barrel, mixing the surface glue diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue into a surface glue storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness straw base paper, wherein the types of the front side measuring rod and the back side measuring rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.9g/m 2 The coating temperature is 65 ℃, the paper dryness of the base paper before entering the film transfer sizing machine is 92 percent, and the paper dryness of the base paper after exiting the film transfer sizing machine is 75 percent.
Example 3
(1) Grinding: uniformly mixing 35% of Arabama softwood pulp, 50% of Cara hardwood pulp and 15% of bamboo pulp, and then pulping in series by adopting three DD720 double disc mills, wherein the first disc mill adopts a cutting fin-shaped grinding sheet, the second disc mill and the third disc mill adopt a broom fin-shaped grinding sheet to obtain wood pulp, the beating degree is 26-degree SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 12kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, keeping the temperature for 20min, extracting the mixture to a surface glue dilution barrel, mixing the mixture with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue to a surface glue stock storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness suction pipe base paper, wherein the models of the front side metering rod and the back side metering rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.8g/m 2 The coating temperature is 65 ℃, the paper-forming dryness of the base paper before entering the film transfer coating sizing machine is more than or equal to 90 percent, and the paper-forming dryness of the film discharge transfer sizing machine is more than or equal to 70 percent.
Comparative example 1
(1) Grinding: uniformly mixing 35% of bleached sulfate Aglaia conifer wood pulp, 55% of Cara broadleaf wood pulp and 10% of bamboo pulp, and pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin-shaped grinding disc, the second disc mill and the third disc mill adopt a broom fin-shaped grinding disc to obtain wood pulp, the beating degree is 26 degrees SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 10kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, preserving heat for 20min, extracting the mixture into a surface glue diluting barrel, mixing the surface glue diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue into a surface glue storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the base paper for the straw, wherein the models of the front metering rod and the back metering rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.9g/m 2 The coating temperature is 65 ℃, the paper-forming dryness of the base paper before entering the film transfer coating sizing machine is 92 percent, and the paper-forming dryness of the film discharge transfer sizing machine is 75 percent.
Comparative example 2
(1) Grinding: uniformly mixing 35% of Arabama softwood pulp, 55% of Cara hardwood pulp and 10% of bamboo pulp, and then pulping in series by adopting three DD720 double disc mills, wherein the first disc mill adopts a cutting fin-shaped grinding sheet, the second disc mill and the third disc mill adopt a broom fin-shaped grinding sheet to obtain wood pulp, the beating degree is 26-degree SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 10kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface sizing cooking tank, introducing steam, heating to 95 ℃, keeping the temperature for 20min, extracting to a surface sizing dilution barrel, mixing with 6 parts of chitosan, 10 parts of surface AKD and 540 parts of water to form surface sizing, and extracting to a surface sizing storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine, wherein the types of the front side measuring rod and the back side measuring rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.9g/m 2 The coating temperature is 65 ℃, the paper-forming dryness of the base paper before entering the film transfer coating sizing machine is 92 percent, and the paper-forming dryness of the film discharge transfer sizing machine is 75 percent.
Comparative example 3
(1) Grinding: uniformly mixing 35% of Arabama softwood pulp, 55% of Cara hardwood pulp and 10% of bamboo pulp, and then pulping in series by adopting three DD720 double disc mills, wherein the first disc mill adopts a cutting fin-shaped grinding sheet, the second disc mill and the third disc mill adopt a broom fin-shaped grinding sheet to obtain wood pulp, the beating degree is 26-degree SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, preserving heat for 20min, extracting the mixture into a surface glue diluting barrel, mixing the surface glue diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue into a surface glue storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine, wherein the types of the front side measuring rod and the back side measuring rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.8g/m 2 The coating temperature is 65 ℃, the paper-forming dryness of the base paper before entering the film transfer coating sizing machine is more than or equal to 90 percent, and the paper-forming dryness of the film discharge transfer sizing machine is more than or equal to 70 percent.
Comparative example 4
(1) Grinding: uniformly mixing 40% of Arabama softwood pulp and 60% of Kara hardwood pulp, and pulping in series by using three DD720 double disc mills, wherein the first disc mill uses a cutting fin-type grinding disc, the second and third disc mills use a broom fin-type grinding disc to obtain wood pulp, the beating degree is 26 degrees SR, and the wet weight is 6 g;
(2) papermaking: according to the process flow chart, 20kg of cationic starch/ton pulp, 10kg of wet strength agent/ton pulp, 22kg of AKD/ton pulp, 10kg of aluminum sulfate/ton pulp and 3kg of silica sol/ton pulp are added, and base paper is prepared by a fourdrinier vat machine, wherein the vehicle speed is 220m/min, and the vat steam pressure is 530 kPa.
(3) Preparing surface glue: uniformly stirring 100 parts of amphoteric surface tapioca starch, 10 parts of polyvinyl alcohol and 270 parts of water in a surface glue cooking tank, introducing steam, heating to 95 ℃, keeping the temperature for 20min, extracting the mixture to a surface glue dilution barrel, mixing the mixture with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to form surface glue, and extracting the surface glue to a surface glue stock storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness suction pipe base paper, wherein the models of the front side metering rod and the back side metering rod are V30, the linear pressure is 20kN/m, and the coating weight is 1.8g/m 2 The coating temperature is 65 ℃, the paper dryness of the base paper before entering the film transfer sizing machine is 92 percent, and the paper dryness of the base paper after exiting the film transfer sizing machine is 75 percent.
The base paper for straws prepared in examples 1 to 3 and comparative examples 1 to 4 (about 120 g/m) was tested with reference to the test standard GB/T2679.3-1996 2 ) The performance test was performed, and the test results are shown in table 1.
TABLE 1 Performance test results of base paper for suction pipes prepared in examples and comparative examples
As can be seen from the three examples in Table 1, the stiffness of the rubber sheet reaches more than 1.3 mN.m within the process range required by the invention, and as can be seen from the 4 comparative examples, the stiffness requirements of the examples can not be met by changing the pulp sheet and the surface glue formula, and the increasing customer requirements can not be met.
Claims (10)
1. A preparation method of raw paper for a high-stiffness straw is characterized by comprising the following steps: the method comprises the following steps:
(1) grinding: uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bamboo pulp according to a ratio, and pulping in series by using three DD720 double disc mills, wherein the first disc mill uses a cutting fin-shaped grinding sheet, the second disc mill and the third disc mill use a broom fin-shaped grinding sheet to obtain wood pulp, the beating degree is 24-28 DEG SR, and the wet weight is 5-7 g;
(2) papermaking: sequentially adding cationic tapioca starch, a wet strength agent, AKD, aluminum sulfate and silica sol into wood pulp, uniformly mixing, and preparing base paper by a fourdrinier vat paper machine;
(3) preparing surface glue: uniformly stirring amphoteric surface tapioca starch and polyvinyl alcohol in a formula amount and water in a formula amount of 1/3-1/2 in a surface glue cooking tank, introducing steam, heating to 90-100 ℃, preserving heat for 15-25min, extracting the mixture into a surface glue diluting bucket, mixing the mixture with chitosan, surface AKD, sodium silicate and water in the formula amount to form surface glue, and extracting the surface glue into a surface glue storage tank for later use;
(4) film transfer sizing: coating the front and back sides of the base paper by a film transfer sizing machine to obtain the high-stiffness suction tube base paper, wherein the models of the front side metering rod and the back side metering rod are V30, the linear pressure is 20-25kN/m, and the coating weight is 1.5-2g/m 2 。
2. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (1), the wood pulp consists of 30-40% of bleached sulfate softwood pulp, 50-60% of bleached sulfate hardwood pulp and 5-15% of bamboo pulp; the bleached sulfate softwood pulp is alabama softwood pulp; the bleached sulfate hardwood pulp is carabine hardwood pulp.
3. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (2), the operation parameters of the fourdrinier wire vat paper machine are as follows: the vehicle speed is 200-.
4. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (2), the addition amount of AKD is 20-25 kg/ton pulp; the addition amount of the cationic tapioca starch is 16-25 kg/ton pulp.
5. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (2), the adding amount of the silica sol is 2-4 kg/ton of slurry; the wet strength agent is added in an amount of 8-12 kg/ton pulp.
6. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (2), the adding amount of the aluminum sulfate is 8-12 kg/ton pulp.
7. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (3), the surface adhesive comprises the following raw materials in parts by weight:
8. the method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (3), the solid content of the prepared surface adhesive is 14 +/-1%, the temperature is 65-70 ℃, the viscosity is 15-20mpa & s, and the pH value is 5-6.
9. The method for preparing base paper for a high stiffness straw according to claim 1, wherein the method comprises the following steps: in the step (4), the paper dryness of the base paper before entering the film transfer sizing machine is more than or equal to 90 percent, and the paper dryness of the base paper after exiting the film transfer sizing machine is more than or equal to 70 percent.
10. The utility model provides a high stiffness straw body paper which characterized in that: prepared by the preparation method of any one of claims 1 to 9.
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| CN116005487A (en) * | 2023-03-07 | 2023-04-25 | 山东仁丰特种材料股份有限公司 | Process for producing paper rod base paper by long-net large-cylinder paper machine |
| CN116005487B (en) * | 2023-03-07 | 2024-03-26 | 山东仁丰特种材料股份有限公司 | Process for producing paper rod base paper by long-net large-cylinder paper machine |
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| CN116084202B (en) * | 2023-03-10 | 2024-03-15 | 山东仁丰特种材料股份有限公司 | Method for producing base paper of pillow paper by using fourdrinier vat machine |
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