CN110820420A - Papermaking method of multilayer coated high-bulk high-whiteness matte coated paper - Google Patents
Papermaking method of multilayer coated high-bulk high-whiteness matte coated paper Download PDFInfo
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- CN110820420A CN110820420A CN201911103460.6A CN201911103460A CN110820420A CN 110820420 A CN110820420 A CN 110820420A CN 201911103460 A CN201911103460 A CN 201911103460A CN 110820420 A CN110820420 A CN 110820420A
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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
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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
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
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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
- 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
- D21H23/32—Addition to the formed paper by contacting paper with an excess of material, e.g. from a reservoir or in a manner necessitating removal of applied excess material from the paper
- D21H23/34—Knife or blade type coaters
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Abstract
The invention discloses a papermaking method of multilayer coating high-bulk high-whiteness matte coated paper, which adopts sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp (the bulk is 3.0 cm)3More than g and whiteness of more than 75 percent), strictly controlling the mixture ratio of the sizing agents, adopting a special coating formula, adopting different raw material ratios of bottom coating, middle coating and surface coating, and adopting unique MSP (double-sided coating) + scraper coatingThe cloth process is used for multi-layer coating, based on single-layer net-sandwiched base paper making with the speed as high as 1300m/min, the parameters of paper machine linear pressure and the like are controlled, so that the paper surface keeps reasonable micro roughness and whiteness, and the finished paper meets the requirements of high-grade printing. The bulk of the finished paper obtained by the invention is more than or equal to 1cm3And/g, ISO whiteness is more than or equal to 88 percent.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to a papermaking method of multilayer coated high-bulk high-whiteness matte coated paper.
Background
The matte coated paper is mainly used for producing printed matters such as high-grade books, periodicals, picture books, commercial advertisements and the like. The matt coated paper has low glossiness, no dazzling, bright pattern color of printed matter, strong stereoscopic impression and ready acceptanceIs favored by consumers. The development trend of the matte coated paper market is good surface feeling, higher bulk, small roughness and higher printing quality. Most of high-bulk matte coated papers manufactured on the market are manufactured by long-wire paper with a low paper machine speed, and the bulk of the matte coated papers manufactured by using a single-layer wire paper machine is less than 1cm3(iv) g, the requirement of high bulk cannot be met. In addition, the bulk of the paper made by the paper is more than 1cm3The roughness of the paper machine of the matte coated paper is more than 5um, and the whiteness is low, so that the paper machine cannot meet the requirement of high-grade printing.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a papermaking method of multi-layer coating high-bulk high-whiteness matt coated paper. Compared with the matte coated paper manufactured by a fourdrinier wire with a low paper machine speed or the matte coated paper manufactured by a sandwich wire with a paper machine speed below 1300m/min in the market, the product developed by the technology has the speed as high as 1300m/min, is manufactured by single-layer sandwich base paper, adopts three MSP (double-sided coating) and four scraper multilayer coating processes unique to the industry, and has the matte coated paper with high bulk, excellent roughness and high whiteness.
The technical scheme adopted by the invention is as follows:
a method for manufacturing a multi-layer coated high-bulk high-whiteness matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20-28: 40-55: 25-40, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 410-470 ml, and the bulk is 1.2-1.4 cm3(ii)/g; the freeness of the bleached sulfate hardwood pulp after pulping is 360-420 ml, and the bulk is 1.2-1.4 cm3(ii)/g; the freeness of the pulped alkaline hydrogen peroxide mechanical pulp is 340-400 ml, and the bulk is 3.0cm3More than g, and the whiteness is more than 75%;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the raw paper pulp comprises 84-97% of a pulp mixture, 2-15% of ground calcium carbonate and 0.6-1.0% of positive starch; the speed of the screen part is 1300-1400 m/min, the pulp screen speed ratio is 1.035-1.040, the first line pressing pressure is 1070-1090 kN/m, the second line pressing pressure is 1040-1050 kN/m, and the hard calendering pressure is 40-50 kN/m;
s3: producing base paper by adopting the base paper pulp obtained in the step S2, wherein the base paper produced by the method has the quantitative weight of 85-150 g/m2Wherein the water content is 4-7%;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 9-13% to carry out membrane transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10-14 cps, and the sizing amount is 2-4 g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 54-60%, the low shear viscosity is 250-500 cps, and the coating weight is 8-30 g/m2First coat gauge bar pressure: upper/lower rolls: 1.4-1.8/1.4-1.8 bar; the base coating comprises, by weight, 84-87 parts of ground calcium carbonate C65 grade, 12-14 parts of an adhesive, 0.05-0.20 part of a dispersant, 0.02-0.08 part of a defoaming agent and 0.4-0.8 part of a thickening agent;
s6: on the basis of the step S5, two times of scraper coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60-65%, the low shear viscosity is 500-600 cps, and the total coating weight of the two sides coated once is 20-24 g/m2The pressure of the middle coating scraper is 35-60%; the middle coating comprises 88-90 parts by weight of ground calcium carbonate C65 grade, 9-11 parts by weight of adhesive, 0.05-0.20 part by weight of dispersant, 0.02-0.08 part by weight of defoaming agent and 0.4-0.8 part by weight of thickener;
s7: based on the step S6, two times of scraper coating are adopted, one surface is coated each time, surface coating is carried out, the solid content of the coating is 67-69%, the low shear viscosity is 1000-1400 cps, and the total coating weight of each one time coating on two surfaces is 20-24 g/m2The pressure of the top coating scraper is 30-55%; the coating coated by the top coating scraper comprises 30-35 parts by weight of ground calcium carbonate C65 grade, 56-61 parts by weight of ground calcium carbonate C98 grade, 9-11 parts by weight of adhesive, 0.05-0.20 part by weight of dispersant, 0.02-0.08 part by weight of defoaming agent, 0.1-0.3 part by weight of lubricant and 0.2-0.6 part by weight of thickener;
s8: and (5) calendering the paper product obtained in the step (S7) by using a super calender to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110-120 ℃, and the linear pressure is 40-50 kN/m, so that finished paper is prepared.
Preferably, in step S2, the wire section speed is 1400m/min, the pulp wire speed ratio is 1.040, the first line pressure is 1070kN/m, the second line pressure is 1050kN/m, and the hard calendering pressure is 40 kN/m.
Preferably, in step S2, the ground calcium carbonate is ground calcium carbonate C60 treated by a polymer, and the content of particles with a particle size of less than 2um after treatment is 27-30%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 56-60%.
Preferably, in step S5, the content of particles with a particle size of less than 2um in the ground calcium carbonate C65 is 62-66%, and the adhesive is at least one of styrene-butadiene latex and biological latex.
Preferably, in step S6, the content of particles with a particle size of less than 2um in the ground calcium carbonate C65 is 62-66%, and the adhesive is at least one of styrene-butadiene latex and biological latex.
Preferably, in step S7, in the ground calcium carbonate C98, the content of particles with a particle size of less than 2um is greater than 98%, and the adhesive is at least one of styrene-butadiene latex and biological latex.
Preferably, in step S5, the adhesive is a biological latex, the dispersant is polyacrylate and polyphosphate, the defoamer is phosphate and higher fatty acid, and the thickener is sodium carboxymethyl starch.
In step S6, the adhesive is styrene-butadiene latex, the dispersant is polyacrylate and polyphosphate, the defoamer is phosphate and higher fatty acid, and the thickener is sodium carboxymethylcellulose.
In step S7, the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoamer is phosphate esters and higher fatty acid, the lubricant is calcium stearate, and the thickener is carboxymethyl cellulose or carboxymethyl cellulose.
Preferably, in step S5, the first priming has a coating solid content of 59%, a low shear viscosity of 500cps, and a coating weight of 500cps16g/m2(ii) a During the second priming, the solid content of the coating is 60 percent, the low-shear viscosity is 500cps, and the coating weight is 14g/m2First coat gauge bar pressure: upper/lower rolls: 1.6/1.8bar
Compared with the prior art, the invention has the beneficial effects that:
(1) the base paper is manufactured based on single-layer mesh-sandwiched base paper with the vehicle speed as high as 1300m/min, and sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp (the bulk is 3.0 cm)3More than g, the whiteness is more than 75 percent), grinding calcium carbonate and positive starch, strictly controlling reasonable proportion, the forming of base paper, the surface structure and other properties, and establishing a foundation for producing the matte coated paper with high bulk and high whiteness.
(2) The invention uses the coating formula special for the matte coated paper, and the primary coating, the middle coating and the top coating adopt different raw material proportions, and three MSP (double-sided coating) and four scraper multilayer coating are carried out, so that the reasonable micro roughness and whiteness of the paper surface are kept, and the finished paper meets the requirements of high-grade printing.
(3) The invention strictly controls the production process, and the bulk of the finished paper is more than or equal to 1cm through the scheme of the invention3And/g, ISO whiteness is more than or equal to 88 percent. The difference value between the glossiness after printing and the glossiness before printing is about 39%, the printing effect of the paper is good, the phenomenon of printing and floating is not found, and the conventional printing can be met.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
Example 1
A method for manufacturing a multi-layer coated high-bulk high-whiteness matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20: 55: 25, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 440ml, and the bulk is 1.3cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 390ml, and the bulk is 1.3cm3(ii)/g; the freeness of the alkaline hydrogen peroxide mechanical pulp after pulping is 375ml, and the bulk isAt 3.1cm3The whiteness is 79 percent;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 93.7 percent of pulp mixture, 5.6 percent of ground calcium carbonate and 0.7 percent of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 28.5%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the speed of the screen part is 1400m/min, the pulp screen speed ratio is 1.040, the first line pressing pressure is 1070kN/m, the second line pressing pressure is 1050kN/m, and the hard calendering pressure is 40 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 120g/m2Wherein the water content is 6 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 10 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10cps, and the total sizing amount is 3g/m2；
S5: on the basis of the step S4, two times of film transfer double-sided coating are adopted for priming, and when the priming is carried out for the first time, the solid content of the coating is 59 percent, the low-shear viscosity is 500cps, and the coating weight is 16g/m2(ii) a During the second priming, the solid content of the coating is 60 percent, the low-shear viscosity is 500cps, and the coating weight is 14g/m2First coat gauge bar pressure: upper/lower rolls: 1.6/1.8 bar; the priming paint comprises 86.3 parts of ground calcium carbonate C65 grade, 13.1 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.5 part of thickening agent in parts by weight; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s6: based on the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60.5 percent, the low shear viscosity is 550cps, and the total coating weight of the two sides is 21g/m2The pressure of the middle coating scraper is 45 percent; the middle coating comprises, by weight, 89.2 parts of ground calcium carbonate C65 grade,10 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.7 part of thickening agent; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethylcellulose;
s7: in step S6, two times of blade coating are adopted, one side is coated each time, surface coating is carried out, the solid content of the coating is 68%, the low shear viscosity is 1150cps, and the total coating amount of the two sides is 23g/m2Top coating scraper pressure 45%; the coating coated by the top coating scraper comprises 31 parts by weight of ground calcium carbonate C65 grade, 58 parts by weight of ground calcium carbonate C98 grade, 10 parts by weight of adhesive, 0.15 part by weight of dispersant, 0.05 part by weight of defoamer, 0.2 part by weight of lubricant and 0.3 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersing agent is sodium polymethacrylate, the defoaming agent is phosphate, the lubricating agent is calcium stearate, and the thickening agent is carboxymethyl cellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Example 2
A method for manufacturing a multi-layer coated high-bulk high-whiteness matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20: 55: 25, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 440ml, and the bulk is 1.3cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 390ml, and the bulk is 1.3cm3(ii)/g; the freeness of the alkali hydrogen peroxide mechanical pulp after pulping is 375ml, and the bulk is 3.1cm3The whiteness is 79 percent;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 93.7 percent of pulp mixture, 5.6 percent of ground calcium carbonate and 0.7 percent of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 28.5%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 120g/m2Wherein the water content is 6 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 10 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10cps, and the total sizing amount is 3g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 58%, the low shear viscosity is 250cps, and the total coating weight is 12g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.4/1.8 bar; the priming paint comprises 86.3 parts of ground calcium carbonate C65 grade, 13.1 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.5 part of thickening agent in parts by weight; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: based on the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60.5 percent, the low shear viscosity is 550cps, and the total coating weight of the two sides is 21g/m2The pressure of the middle coating scraper is 45 percent; the middle coating comprises, by weight, 89.2 parts of ground calcium carbonate C65 grade, 10 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.7 part of thickening agent; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s7: on the basis of the step S6, two times of blade coating are adopted, one surface is coated each time, and surface coating is carried outThe solid content of the coating is 68 percent, the low shear viscosity is 1150cps, and the total coating weight of two surfaces coated once is 23g/m2Top coating scraper pressure 45%; the coating coated by the top coating scraper comprises 31 parts by weight of ground calcium carbonate C65 grade, 58 parts by weight of ground calcium carbonate C98 grade, 10 parts by weight of adhesive, 0.15 part by weight of dispersant, 0.05 part by weight of defoamer, 0.2 part by weight of lubricant and 0.3 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Example 3
A method for manufacturing a multi-layer coated high-bulk high-whiteness matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 28: 40: 32, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 410ml, and the bulk is 1.2cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 420ml, and the bulk is 1.4cm3(ii)/g; the freeness of the alkali hydrogen peroxide mechanical pulp after pulping is 340ml, and the bulk is 3.1cm3(g), the whiteness is 80%;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 97% of pulp mixture, 2% of ground calcium carbonate and 1% of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 27 percent; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 150g/m2Wherein the water content is 7 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 9 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 14cps, and the total sizing amount is 2g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 54 percent, the low shear viscosity is 500cps, and the total coating weight is 8g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.8/1.4 bar; the priming paint comprises 87 parts by weight of ground calcium carbonate C65 grade, 12 parts by weight of adhesive, 0.20 part by weight of dispersant, 0.08 part by weight of defoamer and 0.8 part by weight of thickener; the content of the ground calcium carbonate C65 is 66% of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: based on the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 65 percent, the low shear viscosity is 500cps, and the total coating weight of the two sides coated each time is 24g/m2The middle coating scraper pressure is 35%; the middle coating comprises 88 parts of ground calcium carbonate C65 grade, 11 parts of adhesive, 0.20 part of dispersant, 0.02 part of defoamer and 0.8 part of thickener in parts by weight; the content of the ground calcium carbonate C65 is 62 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s7: based on the step S6, two times of blade coating are adopted, one surface is coated each time, the surface coating is carried out, the solid content of the coating is 67 percent, the low shear viscosity is 1400cps, and the total coating weight of the two surfaces coated each time is 20g/m2The top coating scraper pressure is 30%; the coating applied by the top coating scraper comprises 30 parts by weight of ground calcium carbonate C65 grade, 61 parts by weight of ground calcium carbonate C98 grade, 11 parts by weight of adhesive, 0.05 part by weight of dispersant, 0.08 part by weight of defoamer, 0.1 part by weight of lubricant and 0.2 part by weight of thickener; the ground calcium carbonate C98 is a particle with a particle size less than 2umThe amount is 99%; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 120 ℃, and the linear pressure is 40kN/m, so that finished paper is prepared.
Example 4
A method for manufacturing a multi-layer coated high-bulk high-whiteness matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20: 40: 40, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 470ml, and the bulk is 1.4cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 360ml, and the bulk is 1.2cm3(ii)/g; the freeness of the alkali hydrogen peroxide mechanical pulp after pulping is 400ml, and the bulk is 3.2cm3The whiteness is 79 percent;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 84% of pulp mixture, 15% of ground calcium carbonate and 1% of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 30%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 56 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 85g/m2Wherein the water content is 4%;
s4: on the basis of the step S3, adopting starch glue solution with mass concentration of 13% to carry out membrane transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 14cps, and the total sizing amount is 4g/m2；
S5：Based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 60 percent, the low shear viscosity is 250cps, and the total coating weight is 30g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.6/1.5 bar; the priming paint comprises 84 parts by weight of ground calcium carbonate C65 grade, 14 parts by weight of adhesive, 0.05 part by weight of dispersant, 0.02 part by weight of defoamer and 0.4 part by weight of thickener; the content of the ground calcium carbonate C65 is 62 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: based on the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60 percent, the low shear viscosity is 600cps, and the coating weight of each coating on two sides is 20g/m in total2The pressure of the middle coating scraper is 60 percent; the middle coating comprises 90 parts by weight of ground calcium carbonate C65 grade, 9 parts by weight of adhesive, 0.05 part by weight of dispersant, 0.08 part by weight of defoamer and 0.4 part by weight of thickener; the content of the ground calcium carbonate C65 is 66% of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s7: based on the step S6, two times of blade coating are adopted, one surface is coated each time, the surface coating is carried out, the solid content of the coating is 69 percent, the low shear viscosity is 1000cps, and the total coating weight of the two surfaces coated each time is 24g/m2Top coating blade pressure 55%; the coating coated by the top coating scraper comprises 35 parts by weight of ground calcium carbonate C65 grade, 56 parts by weight of ground calcium carbonate C98 grade, 9 parts by weight of adhesive, 0.20 part by weight of dispersant, 0.02 part by weight of defoamer, 0.3 part by weight of lubricant and 0.6 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose;
s8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Comparative example 1:
a method for manufacturing matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20: 55: 25, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 440ml, and the bulk is 1.3cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 390ml, and the bulk is 1.3cm3(ii)/g; the freeness of the alkali hydrogen peroxide mechanical pulp after pulping is 375ml, and the bulk is 3.1cm3The whiteness is 79 percent;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 91.8% of pulp mixture, 5.5% of ground calcium carbonate and 2.7% of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 28.5%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 120g/m2Wherein the water content is 6 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 15 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10cps, and the total sizing amount is 3g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 58%, the low shear viscosity is 250cps, and the total coating weight is 12g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.4/1.8 bar; the priming paint comprises 88 parts by weight of ground calcium carbonate C65 grade, 16 parts by weight of adhesive, 0.03 part by weight of dispersant, 0.05 part by weight of defoamer and 0.3 part by weight of thickener; the content of the ground calcium carbonate C65 in the particles with the particle size of less than 2um is 65 percent(ii) a The adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: in step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 57 percent, the low shear viscosity is 510cps, and the total coating weight of the two sides coated each time is 21g/m2The pressure of the middle coating scraper is 45 percent; the middle coating comprises 85 parts of ground calcium carbonate C65 grade, 10 parts of adhesive, 0.3 part of dispersant, 0.05 part of defoamer and 0.3 part of thickener in parts by weight; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s7: in step S6, two times of blade coating are adopted, one side is coated each time, surface coating is carried out, the solid content of the coating is 67%, the low shear viscosity is 1100cps, and the total coating weight of the two sides is 26g/m2Top coating scraper pressure 45%; the coating coated by the top coating scraper comprises 37 parts by weight of ground calcium carbonate C65 grade, 58 parts by weight of ground calcium carbonate C98 grade, 12 parts by weight of adhesive, 0.15 part by weight of dispersant, 0.05 part by weight of defoamer, 0.5 part by weight of lubricant and 0.1 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Comparative example 2:
a method for manufacturing matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp, alkaline hydrogen peroxide mechanical pulp and bleached chemithermomechanical pulp according to the weight ratio of 13: 62: 7.5: 17.5, mixing to form a slurry mixed solution; after the sulphate softwood pulp is pulpedThe freeness is 440ml, and the bulk is 1.3cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 395ml, and the bulk is 1.3cm3(ii)/g; the alkali hydrogen peroxide mechanical pulp and the bleaching chemical thermomechanical pulp are mixed and then pulped, the freeness is 360ml, and the bulk is 2.7cm3(iv)/g, whiteness at 78%;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 93.7 percent of pulp mixture, 5.6 percent of ground calcium carbonate and 0.7 percent of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 28.5%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 120g/m2Wherein the water content is 6 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 10 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10cps, and the total sizing amount is 2.6g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 55 percent, the low shear viscosity is 250cps, and the total coating weight is 9g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.4/1.8 bar; the priming paint comprises 86.3 parts of ground calcium carbonate C65 grade, 13.1 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.5 part of thickening agent in parts by weight; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: on the basis of the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60 percent, the low shear viscosity is 550cps, the coating weight of each one time coating on the two sides is combinedMeter 21g/m2The pressure of the middle coating scraper is 45 percent; the middle coating comprises, by weight, 89.2 parts of ground calcium carbonate C65 grade, 10 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.7 part of thickening agent; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, the defoaming agent is phosphate, and the thickening agent is sodium carboxymethyl starch;
s7: in step S6, two times of blade coating are adopted, one surface is coated each time, surface coating is carried out, the solid content of the coating is 68%, the low shear viscosity is 1000cps, and the total coating weight of the two surfaces coated each time is 21g/m2Top coating scraper pressure 45%; the coating coated by the top coating scraper comprises 31 parts by weight of ground calcium carbonate C65 grade, 58 parts by weight of ground calcium carbonate C98 grade, 10 parts by weight of adhesive, 0.15 part by weight of dispersant, 0.05 part by weight of defoamer, 0.2 part by weight of lubricant and 0.3 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Comparative example 3
A method for manufacturing matte coated paper comprises the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp, alkaline hydrogen peroxide mechanical pulp and bleached chemithermomechanical pulp according to the weight ratio of 15: 61: 7.2: 16.8, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 440ml, and the bulk is 1.3cm3(ii)/g; the freeness of bleached sulfate hardwood pulp after pulping is 395ml, and the bulk is 1.3cm3(ii)/g; the freeness of the alkaline hydrogen peroxide mechanical pulp and the bleaching chemical thermomechanical pulp after mixing and pulping is 360ml, and the bulk is 2.7cm3(iv)/g, whiteness at 78%;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the base paper pulp comprises 93.7 percent of pulp mixture, 5.6 percent of ground calcium carbonate and 0.7 percent of positive starch; the ground calcium carbonate is ground calcium carbonate C60 treated by polymer (polyacrylic acid), and the content of particles with the particle size of less than 2um after treatment is 28.5%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 60 percent; the net part speed is 1300m/min, the pulp net speed ratio is 1.035, the first line pressing pressure is 1090kN/m, the second line pressing pressure is 1040kN/m, and the hard calendering pressure is 50 kN/m;
s3: the base paper pulp obtained in the step S2 is adopted to produce the base paper, and the basis weight of the produced base paper is 120g/m2Wherein the water content is 6 percent;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 10 percent to carry out film transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10cps, and the total sizing amount is 3g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 58%, the low shear viscosity is 250cps, and the total coating weight is 12g/m2(ii) a Base coat gauge bar pressure: upper/lower rolls: 1.4/1.8 bar; the priming paint comprises 86.3 parts of ground calcium carbonate C65 grade, 13.1 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.5 part of thickening agent in parts by weight; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyphosphate, the defoaming agent is higher fatty acid, and the thickening agent is sodium carboxymethyl starch;
s6: based on the step S5, two times of blade coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60.5 percent, the low shear viscosity is 550cps, and the total coating weight of the two sides is 21g/m2The pressure of the middle coating scraper is 45 percent; the middle coating comprises, by weight, 89.2 parts of ground calcium carbonate C65 grade, 10 parts of adhesive, 0.05 part of dispersant, 0.05 part of defoaming agent and 0.7 part of thickening agent; the content of the ground calcium carbonate C65 is 65 percent of particles with the particle size of less than 2 um; the adhesive is biological latex, the dispersant is polyacrylate, and the defoaming agent is phosphateAnd the thickening agent is sodium carboxymethyl starch;
s7: in step S6, two times of blade coating are adopted, one side is coated each time, surface coating is carried out, the solid content of the coating is 68%, the low shear viscosity is 1150cps, and the total coating amount of the two sides is 23g/m2Top coating scraper pressure 45%; the coating coated by the top coating scraper comprises 31 parts by weight of ground calcium carbonate C65 grade, 58 parts by weight of ground calcium carbonate C98 grade, 10 parts by weight of adhesive, 0.15 part by weight of dispersant, 0.05 part by weight of defoamer, 0.2 part by weight of lubricant and 0.3 part by weight of thickener; the content of the ground calcium carbonate C98 is 99 percent of the particle with the particle size less than 2 um; the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoaming agent is higher fatty acid, the lubricant is calcium stearate, and the thickening agent is sodium carboxymethylcellulose.
S8: and (4) calendering the paper product obtained in the step (S7) by using a super calender (a Fuyite super calender Janus CalenderMK2) to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110 ℃, and the linear pressure is 50kN/m, so that finished paper is prepared.
Comparative example 4:
a method for manufacturing matte coated paper comprises the following steps:
base paper: the pulp is mixed pulp of 80 parts of LBKP, 10 parts of NBKP and 10 parts of BCTMP; the paper making base paper was 170 gsm. The ash content of the base paper was 10%.
The matte coated paper obtained in the examples and the comparative examples is taken for performance test, and the results are shown in table 1.
As can be seen from Table 1, the bulk of the matte coated paper with high bulk manufactured by the papermaking method of the invention is more than 1cm3The ISO whiteness is more than or equal to 88 percent, wherein the bulk of the example 1 can reach 1.08cm3The whiteness can reach 89.6 percent. The bulk of the matte coated paper manufactured by the comparative examples 1-3 is less than 1cm3The bulk of the matte coated paper manufactured by the comparative example 4 is larger than 1cm3The roughness is not less than 5um, and the roughness is too large to meet the requirement of high-grade printingAnd (6) obtaining.
The physical properties of the copperplate paper obtained by the invention are detected after printing, and the result shows that the difference value between the glossiness after printing and the glossiness before printing is about 39%, the printing effect of the paper is good, the phenomenon of printing and blooming is not found, the conventional printing can be met, the printing product simulates the perforation of the calendar, no obvious powder explosion is generated during processing, other abnormity is not found, and the perforation operation of the calendar can be met.
The foregoing is a more detailed description of the present invention that is presented in conjunction with specific embodiments, and the practice of the invention is not to be considered limited to those descriptions. It will be apparent to those skilled in the art that a number of simple derivations or substitutions can be made without departing from the inventive concept.
Claims (9)
1. A papermaking method of a multi-layer coating high-bulk high-whiteness matte coated paper is characterized by comprising the following steps:
s1: taking sulfate softwood pulp, bleached sulfate hardwood pulp and alkaline hydrogen peroxide mechanical pulp, and mixing the raw materials in a weight ratio of 20-28: 40-55: 25-40, mixing to form a slurry mixed solution; the freeness of the pulped kraft softwood pulp is 410-470 ml, and the bulk is 1.2-1.4 cm3(ii)/g; the freeness of the bleached sulfate hardwood pulp after pulping is 360-420 ml, and the bulk is 1.2-1.4 cm3(ii)/g; the freeness of the pulped alkaline hydrogen peroxide mechanical pulp is 340-400 ml, and the bulk is 3.0cm3More than g, and the whiteness is more than 75%;
s2: adding ground calcium carbonate and positive starch into the slurry mixed solution obtained in the step S1, and fully mixing to obtain raw paper pulp; according to the weight ratio, the raw paper pulp comprises 84-97% of a pulp mixture, 2-15% of ground calcium carbonate and 0.6-1.0% of positive starch; the speed of the screen part is 1300-1400 m/min, the pulp screen speed ratio is 1.035-1.040, the first line pressing pressure is 1070-1090 kN/m, the second line pressing pressure is 1040-1050 kN/m, and the hard calendering pressure is 40-50 kN/m;
s3: producing base paper by adopting the base paper pulp obtained in the step S2, wherein the base paper produced by the method has the quantitative weight of 85-150 g/m2Wherein the water content is 4-7%;
s4: on the basis of the step S3, adopting a starch glue solution with the mass concentration of 9-13% to carry out membrane transfer double-sided sizing, wherein the low shear viscosity of the starch glue solution is 10-14 cps, and the sizing amount is 2-4 g/m2；
S5: based on the step S4, film transfer double-sided coating is adopted for priming, the solid content of the coating is 54-60%, the low shear viscosity is 250-500 cps, and the coating weight is 8-30 g/m2First coat gauge bar pressure: upper/lower rolls: 1.4-1.8/1.4-1.8 bar; the base coating comprises, by weight, 84-87 parts of ground calcium carbonate C65 grade, 12-14 parts of an adhesive, 0.05-0.20 part of a dispersant, 0.02-0.08 part of a defoaming agent and 0.4-0.8 part of a thickening agent;
s6: on the basis of the step S5, two times of scraper coating are adopted, one side is coated each time, the middle coating is carried out, the solid content of the coating is 60-65%, the low shear viscosity is 500-600 cps, and the total coating weight of the two sides coated once is 20-24 g/m2The pressure of the middle coating scraper is 35-60%; the middle coating comprises 88-90 parts by weight of ground calcium carbonate C65 grade, 9-11 parts by weight of adhesive, 0.05-0.20 part by weight of dispersant, 0.02-0.08 part by weight of defoaming agent and 0.4-0.8 part by weight of thickener;
s7: based on the step S6, two times of scraper coating are adopted, one surface is coated each time, surface coating is carried out, the solid content of the coating is 67-69%, the low shear viscosity is 1000-1400 cps, and the total coating weight of each one time coating on two surfaces is 20-24 g/m2The pressure of the top coating scraper is 30-55%; the coating coated by the top coating scraper comprises 30-35 parts by weight of ground calcium carbonate C65 grade, 56-61 parts by weight of ground calcium carbonate C98 grade, 9-11 parts by weight of adhesive, 0.05-0.20 part by weight of dispersant, 0.02-0.08 part by weight of defoaming agent, 0.1-0.3 part by weight of lubricant and 0.2-0.6 part by weight of thickener;
s8: and (5) calendering the paper product obtained in the step (S7) by using a super calender to modify the paper surface, wherein the calender adopts a 4 th nip and a 9 th nip, the calendering temperature is 110-120 ℃, and the linear pressure is 40-50 kN/m, so that finished paper is prepared.
2. The method of making a multi-coated high-bulk high-whiteness matte coated paper according to claim 1, wherein in step S2, the wire section speed is 1400m/min, the pulp wire speed ratio is 1.040, the first line pressing pressure is 1070kN/m, the second line pressing pressure is 1050kN/m, and the hard calendering pressure is 40 kN/m.
3. The method of claim 1, wherein in step S2, the ground calcium carbonate is ground calcium carbonate C60 treated with a polymer, and the content of particles having a particle size of less than 2 μm is 27-30%; in the ground calcium carbonate C60, the content of particles with the particle size of less than 2um is 56-60%.
4. The method of claim 1, wherein in step S5, the content of particles with a particle size of less than 2um in the ground calcium carbonate C65 is within 62-66%, and the binder is at least one of styrene-butadiene latex and biological latex.
5. The method of claim 1, wherein in step S6, the content of particles with a particle size of less than 2um in the ground calcium carbonate C65 is within 62-66%, and the binder is at least one of styrene-butadiene latex and biological latex.
6. The method of making a multi-coated high-bulk high-whiteness matte coated paper according to claim 1, wherein in step S7, the content of particles with a particle size of less than 2um in the ground calcium carbonate C98 is greater than 98%, and the binder is at least one of styrene-butadiene latex and bio-latex.
7. The method of making a multi-layer coated high bulk high whiteness matte coated paper according to claim 1,
in step S5, the adhesive is biological latex, the dispersant is polyacrylate and polyphosphate, the defoaming agent is phosphate and high fatty acid, and the thickener is sodium carboxymethyl starch;
in step S6, the adhesive is styrene-butadiene latex, the dispersant is polyacrylate and polyphosphate, the defoamer is phosphate and higher fatty acid, and the thickener is sodium carboxymethylcellulose;
in step S7, the adhesive is styrene-butadiene latex, the dispersant is sodium polymethacrylate, the defoamer is phosphate esters and higher fatty acid, the lubricant is calcium stearate, and the thickener is carboxymethylcellulose and sodium carboxymethylcellulose.
8. The method of making a multi-layer coated high-bulk high-whiteness matte coated paper according to claim 1, wherein in step S5, the first undercoating is performed at a coating solids content of 59%, a low-shear viscosity of 500cps, and a coating weight of 16g/m2(ii) a During the second priming, the solid content of the coating is 60 percent, the low-shear viscosity is 500cps, and the coating weight is 14g/m2First coat gauge bar pressure: upper/lower rolls: 1.6/1.8 bar.
9. A multilayer coated high-bulk high-whiteness matte coated paper, which is prepared by the papermaking method of any one of claims 1 to 8.
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