CN114790666B - 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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- 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
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 tapioca starch, a wet strength agent, AKD, aluminum sulfate and silica sol into wood pulp, uniformly mixing, and preparing base paper by using a fourdrinier large vat paper machine; and mixing amphoteric surface tapioca starch, polyvinyl alcohol, chitosan, surface AKD, sodium silicate and water to form surface glue, and coating the front and back surfaces of the base paper by adopting a film transfer sizing machine to obtain the high-stiffness straw base paper. The invention focuses on the aspects of pulp board selection, surface glue formulation, chemical auxiliary materials and the like, and the stiffness of the straw base paper is increased by 20-30% compared with the stiffness of the prior commercial 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 method for manufacturing straw base paper, which controls the proportion of bleached sulfate hardwood pulp and bleached sulfate softwood pulp, and the two pulps are pulped independently, controls the corresponding pulping concentration, beating degree and wet weight, adopts the addition of biopolymer to improve the retention rate of paper machine, enhances the fiber binding force of paper, increases the strength index of paper, and uses a yankee cylinder with the diameter of 3 meters on the paper machine to shape paper in the wet part, thereby reducing the transverse deformation of the paper at the subsequent part and improving the surface fineness of the paper. When the raw materials are selected, the silver star pulp board and the forest-boy 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 current straw paper is hardly met.
The patent CN201910471036.0 discloses a manufacturing method of beverage straw paper, which comprises the process steps of pulping, pulp mixing, auxiliary material adding, wet paper making, pre-drying, surface sizing, post-drying, calendaring and reeling, wherein chlorine-free bleached sulfate softwood pulp and chlorine-free bleached sulfate hardwood pulp are used as fiber raw materials for mixing and making, and the raw materials do not contain toxic chemical components such as organic chloride, so that the beverage straw paper is environment-friendly and sanitary and harmless to human bodies. The product has the advantages of good dry strength, continuous paper, high wet strength, good moisture resistance, rapid degradation, meeting the environmental protection requirement, and meeting the sanitary requirement of food paper. However, only a conventional straw paper preparation process is disclosed, and the problem of poor water immersion stiffness of a paper straw is not solved.
Disclosure of Invention
The invention aims to solve the technical problems that: the high-stiffness straw base paper solves the problem of poor water immersion stiffness of the paper straw, and provides better use experience for consumers; the invention also provides a preparation method of the composite.
The preparation method of the high-stiffness straw base paper comprises the following steps:
(1) Pulping: uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bamboo pulp according to a proportion, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs to obtain wood pulp, the beating degree is 24-28 DEG SR, and the wet weight is 5-7g;
(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 using a fourdrinier large vat paper machine;
(3) Preparing surface glue: adding 1/3-1/2 of formula amount of water into the formula amount of amphoteric surface tapioca starch and polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 90-100 ℃, preserving heat for 15-25min, extracting the surface sizing material, mixing the surface sizing material dilution tank with formula amount of chitosan, surface AKD, sodium silicate and the rest formula amount of water into surface sizing material, and extracting the surface sizing material storage tank for standby;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the high-stiffness straw raw paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20-25kN/m, and the coating amount 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 needle-leaved wood pulp is preferably alabama needle-leaved pulp; the bleached sulfate hardwood pulp is preferably a carbene hardwood pulp; the bamboo pulp is selected from normal commercial bamboo pulp.
In the step (2) of the invention, the operation parameters of the fourdrinier vat machine are as follows: the speed of the vehicle is 200-250m/min, and the pressure of the steam in the big cylinder is 500-550kPa.
The addition amount of AKD is 20-25 kg/ton pulp; AKD is preferably kemiraKD324TP, and the manufacturer is Kemira. The addition of AKD ensures the water absorption degree of the cured paper to be in a proper range, generally 25-35g/m 2 In this range, the sucker paper does not absorb water too fast or too slowly, which is most beneficial to the film tube coating operation of the follow-up manufacturer.
The addition amount of the cationic tapioca starch is 16-25 kg/ton pulp; cationic starch is preferably a conventional commercial product with a degree of substitution of 0.03. The cationic tapioca starch has the function of improving the binding force of paper fibers, improving the strength of the paper, and reducing the tensile strength by 10-20% without adding the cationic tapioca starch.
The addition amount of the silica sol is 2-4 kg/ton of pulp; the main component of the silica sol is silicon dioxide, and the preferred manufacturer is Zhejiang Huayang chemical industry Co. The silica sol is used as an anion auxiliary agent, is used after a pressure screen, improves various chemical industry, particularly improves the retention of a wet strength agent, reduces the addition amount of the wet strength agent, prevents the content of chloropropanol from exceeding the standard, and reduces 20-30% of the strength 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 manufacturer is preferably Japanese chestnut field water treatment new material Co. The wet strength agent has the function of improving the wet strength of the paper sheet, so that the strength of the paper sheet is prevented from being reduced too fast after the paper sheet is rolled into the paper suction pipe, 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 of slurry; the content of aluminum sulfate in the 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, which is a conventional commercial product. The aluminum sulfate is used as a cationic auxiliary agent, and is used for improving the stiffness of the paper, and the stiffness of the paper is not reduced by 10-15%.
In the step (3) of the invention, the raw materials of the surface adhesive comprise the following components in parts by weight:
the amphoteric surface tapioca starch is preferably model LS-2, and the manufacturer is Jiangxi Liu and chemical industry Co. The amphoteric surface tapioca starch is used for improving the surface strength of paper pages, reducing the hair and powder falling, and is used as a carrier of other surface reinforcing agents and surface sizing agents.
The polyvinyl alcohol is preferably of the type 1799, and the manufacturer is Anhui Wanwei group Limited liability company. Polyvinyl alcohol is used to increase the surface strength of the paper.
The chitosan is preferably CK-5525, and the manufacturer is Linyi Sanshui technology Co., ltd. The chitosan has the function of improving the surface strength of the paper.
The surface AKD is preferably a commercial product with 30 percent of solid content, and the manufacturer is Zhejiang transmission Hua Yang 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. Sodium silicate acts to increase sheet stiffness without decreasing sheet stiffness.
The surface glue solid content 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 finished paper dryness before the base paper enters the film transfer sizing machine is more than or equal to 90 percent, and the finished paper dryness after the base paper exits the film transfer sizing machine is more than or equal to 70 percent.
The preparation method is used for producing the straw base paper, and paper smoothness is not required intentionally, so that calendaring is not required, the thickness of the paper can be increased and reduced, the stiffness of the paper is reduced, and the paper is too smooth, so that the follow-up film tube coating operation is not facilitated.
The invention also provides the high-stiffness straw base paper which is prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) The Alabama needle pulp adopted by the invention has large fiber thickness, small 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 straw base paper by using auxiliary agents such as aluminum sulfate, and the produced straw base paper stiffness is increased by 20-30% compared with the stiffness of the prior commercial base paper;
(2) The invention focuses on the aspects of pulp board selection, surface sizing formula, chemical auxiliary materials and the like to improve the stiffness of the straw base paper, and sodium silicate in surface sizing is used as an important stiffness agent to be compounded with other raw materials, so that the stiffness of the straw base paper is obviously improved.
Drawings
FIG. 1 is a flow chart of the process for producing the high stiffness straw base paper of the present invention;
FIG. 2 is a flow chart of a surface adhesive preparation device of the invention;
in the figure, 1, a surface glue steaming tank; 2. a surface glue dilution tank; 3. a surface glue storage tank; 4. a surface sizing tank; 5. film transfer size press.
Detailed Description
The invention is further illustrated by the following examples, in which all suitable processes are conventional processes known in the art, all starting materials are commercially available, and all parts are parts by weight unless otherwise specified.
Wherein, AKD: kemiraKD324TP, manufactured by Kemira.
Cationic starch: a conventional commercial product having a degree of substitution of 0.03.
Silica sol: the main component is silicon dioxide, and the manufacturer is Zhejiang chemical industry Co., ltd.
Wet strength agent: the main component is polyamide polyamine epichlorohydrin, and Japanese chestnut field water treatment new material Co.Ltd.
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, which is a conventional commercial product.
Amphoteric surface tapioca starch: LS-2, jiangxi six and chemical industry Co., ltd.
Polyvinyl alcohol: 1799, anhui vitamin group Limited liability company of manufacturer.
Chitosan: CK-5525, manufacturer is in the possession of Yi Sanshui technology Co., ltd.
Surface AKD: the solid content is 30%, and the manufacturers are Zhejiang chemical Hua Yang Limited.
Sodium silicate: the solid content is 30%, the pH is 8-10, the viscosity (25 ℃) is less than 30 mpa.s.
Example 1
(1) Pulping: uniformly mixing 35% of alabama softwood pulp, 55% of Karaku hardwood pulp and 10% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp with a beating degree of 26 DEG SR and a wet weight of 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the high-stiffness straw raw paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating amount 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 92%, and the paper forming dryness of the film transfer sizing machine is 75%.
Example 2
(1) Pulping: uniformly mixing 30% of alabama softwood pulp, 55% of Karaku hardwood pulp and 5% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp with a beating degree of 26 DEG SR and a wet weight of 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the high-stiffness straw raw paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating amount is 1.9g/m 2 Coating temperature of 65At the temperature, the finished paper dryness of the base paper before entering the film transfer sizing machine is 92 percent, and the finished paper dryness of the base paper after exiting the film transfer sizing machine is 75 percent.
Example 3
(1) Pulping: uniformly mixing 35% of alabama softwood pulp, 50% of Karaku hardwood pulp and 15% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp with a beating degree of 26 DEG SR and a wet weight of 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the high-stiffness straw raw paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating amount is 1.8g/m 2 The coating temperature is 65 ℃, the finished paper dryness of the base paper before entering the film transfer coating sizing machine is more than or equal to 90 percent, and the finished paper dryness of the base paper after exiting the film transfer sizing machine is more than or equal to 70 percent.
Comparative example 1
(1) Pulping: uniformly mixing 35% of bleached sulfate silver star softwood pulp, 55% of card-pulled hardwood pulp and 10% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp, wherein the beating degree is 26 DEG SR, and the wet weight is 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the raw paper of the suction pipe, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating amount 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%, and the paper forming dryness of the film transfer sizing machine is 75%.
Comparative example 2
(1) Pulping: uniformly mixing 35% of alabama softwood pulp, 55% of Karaku hardwood pulp and 10% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp with a beating degree of 26 DEG SR and a wet weight of 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by adopting a film transfer sizing machine, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating weight is 1.9g/m 2 Coating and coatingThe temperature is 65 ℃, the paper forming dryness of the base paper before entering the film transfer sizing machine is 92%, and the paper forming dryness of the film transfer sizing machine is 75%.
Comparative example 3
(1) Pulping: uniformly mixing 35% of alabama softwood pulp, 55% of Karaku hardwood pulp and 10% of bamboo pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, and the second and third disc mills adopt broom fin type abrasive discs to obtain wood pulp with a beating degree of 26 DEG SR and a wet weight of 6g;
(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 raw paper is prepared by a fourdrinier large cylinder paper machine, wherein the speed of the raw paper is 220m/min, and the cylinder steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by adopting a film transfer sizing machine, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating weight is 1.8g/m 2 The coating temperature is 65 ℃, the finished paper dryness of the base paper before entering the film transfer coating sizing machine is more than or equal to 90 percent, and the finished paper dryness of the base paper after exiting the film transfer sizing machine is more than or equal to 70 percent.
Comparative example 4
(1) Pulping: uniformly mixing 40% of alabama softwood pulp and 60% of Karaku hardwood pulp, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs to obtain wood pulp, and the beating degree is 26 DEG SR, and the wet weight is 6g;
(2) Papermaking: according to the process flow diagram, adding 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, and preparing the base paper by using a fourdrinier vat paper machine, wherein the speed of the base paper is 220m/min, and the vat steam pressure is 530kPa.
(3) Preparing surface glue: adding 270 parts of water into 100 parts of amphoteric surface tapioca starch and 10 parts of polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 95 ℃, preserving heat for 20min, mixing a surface sizing material diluting barrel with 6 parts of chitosan, 10 parts of surface AKD, 6 parts of sodium silicate and 540 parts of water to obtain surface sizing material, and extracting the surface sizing material into a surface sizing material storage tank for later use;
(4) Film transfer sizing: the raw paper is coated on the front and the back by a film transfer sizing machine to obtain the high-stiffness straw raw paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20kN/m, and the coating amount 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 92%, and the paper forming dryness of the film transfer sizing machine is 75%.
The pipette base papers prepared in examples 1-3 and comparative examples 1-4 (about 120 g/m) 2 ) Performance testing was performed and the test results are shown in table 1.
Table 1 results of performance test of base papers for pipettes prepared in examples and comparative examples
As can be seen from the three examples in Table 1, the stiffness of the invention is over 1.3 mN.m in 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 the change of the pulp board and the change of the surface glue formulation, and the increasing customer demands can not be met.
Claims (7)
1. A preparation method of high-stiffness straw base paper is characterized by comprising the following steps: the method comprises the following steps:
(1) Pulping: uniformly mixing bleached sulfate softwood pulp, bleached sulfate hardwood pulp and bamboo pulp according to a proportion, pulping in series by adopting three DD720 double-disc mills, wherein the first disc mill adopts a cutting fin type abrasive disc, the second disc mill and the third disc mill adopt broom fin type abrasive discs to obtain wood pulp, the beating degree is 24-28 DEG SR, and the wet weight is 5-7g;
(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 using a fourdrinier large vat paper machine;
(3) Preparing surface glue: adding 1/3-1/2 of formula amount of water into the formula amount of amphoteric surface tapioca starch and polyvinyl alcohol, uniformly stirring in a surface sizing material steaming and boiling tank, introducing steam, heating to 90-100 ℃, preserving heat for 15-25min, extracting the surface sizing material, mixing the surface sizing material dilution tank with formula amount of chitosan, surface AKD, sodium silicate and the rest formula amount of water into surface sizing material, and extracting the surface sizing material storage tank for standby;
(4) Film transfer sizing: coating the front and back sides of the base paper by adopting a film transfer sizing machine to obtain the high-stiffness straw base paper, wherein the types of a front metering rod and a back metering rod are V30, the line pressure is 20-25kN/m, and the coating amount is 1.5-2g/m < 2 >;
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 needle-leaved wood pulp is alabama needle-leaved pulp; the bleached sulfate hardwood pulp is a carbene hardwood pulp;
in the step (2), the addition amount of aluminum sulfate is 8-12 kg/ton of slurry;
in the step (3), the raw materials of the surface adhesive comprise the following components in parts by weight:
100 parts of amphoteric surface tapioca starch,
8-12 parts of polyvinyl alcohol,
5-7 parts of chitosan,
8-12 parts of AKD on the surface,
5-7 parts of sodium silicate,
800-820 parts of water.
2. The method for preparing the high-stiffness straw base paper according to claim 1, wherein the method comprises the following steps: in the step (2), the operation parameters of the fourdrinier vat machine are as follows: the speed of the vehicle is 200-250m/min, and the pressure of the steam in the big cylinder is 500-550kPa.
3. The method for preparing the high-stiffness straw base paper 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.
4. The method for preparing the high-stiffness straw base paper according to claim 1, wherein the method comprises the following steps: in the step (2), the addition amount of the silica sol is 2-4 kg/ton of slurry; the addition amount of the wet strength agent is 8-12 kg/ton pulp.
5. The method for preparing the high-stiffness straw base paper according to claim 1, wherein the method comprises the following steps: in the step (3), the prepared surface glue has the solid content of 14+/-1%, the temperature of 65-70 ℃, the viscosity of 15-20mpa.s and the pH of 5-6.
6. The method for preparing the high-stiffness straw base paper according to claim 1, wherein the method comprises the following steps: in the step (4), the finished paper dryness before the base paper enters the film transfer sizing machine is more than or equal to 90 percent, and the finished paper dryness after the base paper exits the film transfer sizing machine is more than or equal to 70 percent.
7. A high-stiffness straw base paper is characterized in that: is prepared by the preparation method according to any one of claims 1 to 6.
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| 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 |
| 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 |
| CN116289290B (en) * | 2023-04-24 | 2024-03-08 | 山东仁丰特种材料股份有限公司 | Method for preparing straw facial tissue by using fourdrinier vat paper machine |
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