CN114457623A - Production process of anti-folding and anti-explosion coated card - Google Patents
Production process of anti-folding and anti-explosion coated card Download PDFInfo
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- CN114457623A CN114457623A CN202210186619.0A CN202210186619A CN114457623A CN 114457623 A CN114457623 A CN 114457623A CN 202210186619 A CN202210186619 A CN 202210186619A CN 114457623 A CN114457623 A CN 114457623A
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- coated card
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 17
- 238000004880 explosion Methods 0.000 title claims abstract description 15
- 230000002742 anti-folding effect Effects 0.000 title abstract description 3
- 238000000576 coating method Methods 0.000 claims abstract description 172
- 239000011248 coating agent Substances 0.000 claims abstract description 164
- 229920002472 Starch Polymers 0.000 claims abstract description 83
- 239000008107 starch Substances 0.000 claims abstract description 83
- 235000019698 starch Nutrition 0.000 claims abstract description 83
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 70
- 239000002585 base Substances 0.000 claims abstract description 48
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 35
- 229920000881 Modified starch Polymers 0.000 claims abstract description 30
- 239000004368 Modified starch Substances 0.000 claims abstract description 30
- 235000019426 modified starch Nutrition 0.000 claims abstract description 30
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims abstract description 22
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 20
- 239000005708 Sodium hypochlorite Substances 0.000 claims abstract description 15
- 239000005038 ethylene vinyl acetate Substances 0.000 claims abstract description 15
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims abstract description 15
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000019832 sodium triphosphate Nutrition 0.000 claims abstract description 15
- 239000003513 alkali Substances 0.000 claims abstract description 9
- 239000002994 raw material Substances 0.000 claims abstract description 9
- 238000003490 calendering Methods 0.000 claims abstract description 8
- 238000000227 grinding Methods 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 47
- 238000000034 method Methods 0.000 claims description 22
- 240000003183 Manihot esculenta Species 0.000 claims description 21
- 238000001035 drying Methods 0.000 claims description 21
- 239000011122 softwood Substances 0.000 claims description 19
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 18
- 239000011121 hardwood Substances 0.000 claims description 18
- 239000000203 mixture Substances 0.000 claims description 15
- 238000004513 sizing Methods 0.000 claims description 14
- 230000002968 anti-fracture Effects 0.000 claims description 13
- 239000006185 dispersion Substances 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 238000004026 adhesive bonding Methods 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 238000004537 pulping Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
- 238000009736 wetting Methods 0.000 claims description 6
- 239000011229 interlayer Substances 0.000 abstract description 9
- 241000658379 Manihot esculenta subsp. esculenta Species 0.000 abstract 1
- 238000000465 moulding Methods 0.000 abstract 1
- 238000007873 sieving Methods 0.000 abstract 1
- 239000000123 paper Substances 0.000 description 66
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 17
- 229920003171 Poly (ethylene oxide) Polymers 0.000 description 15
- 239000004721 Polyphenylene oxide Substances 0.000 description 15
- 239000002174 Styrene-butadiene Substances 0.000 description 15
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 description 15
- 239000013530 defoamer Substances 0.000 description 15
- 239000004816 latex Substances 0.000 description 15
- 229920000126 latex Polymers 0.000 description 15
- 229920000570 polyether Polymers 0.000 description 15
- 239000011115 styrene butadiene Substances 0.000 description 15
- 229920003048 styrene butadiene rubber Polymers 0.000 description 15
- 238000002360 preparation method Methods 0.000 description 9
- 239000003973 paint Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 239000002245 particle Substances 0.000 description 5
- 238000007639 printing Methods 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 4
- 238000000643 oven drying Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- -1 polyoxyethylene Polymers 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000003172 aldehyde group Chemical group 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007646 gravure printing Methods 0.000 description 1
- 125000004029 hydroxymethyl group Chemical group [H]OC([H])([H])* 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000007645 offset printing Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B31/00—Preparation of derivatives of starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- 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
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/58—Polymers or oligomers of diolefins, aromatic vinyl monomers or unsaturated acids or derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/62—Macromolecular organic compounds or oligomers thereof obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/82—Paper comprising more than one coating superposed
-
- 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
- D21H19/80—Paper comprising more than one coating
- D21H19/84—Paper comprising more than one coating on both sides of the substrate
-
- 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
Abstract
The invention discloses a production process of an anti-folding and anti-explosion coated card, which comprises the steps of firstly taking cassava starch as a raw material, obtaining modified starch through alkali treatment, mixing and grinding the modified starch with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, and sieving to obtain coated starch; then, making the mixed paper pulp into paper for molding to obtain base paper; and then the surface of the base paper is glued by using coating starch, and then coating and calendaring are carried out by using a coating containing the coating starch, so as to obtain the folding and explosion resistant coated card. The coated card obtained by the invention has good folding resistance (folding resistance more than 15 times), and high interlayer bonding strength (180J/m)2Above), promoted paper quality, satisfied the high standard requirement to the coated card.
Description
Technical Field
The invention relates to a production process of an explosion-proof coated card. Belongs to the technical field of papermaking.
Background
The coated card is also called printing coated paper. Coating a layer of white coating on the surface of the base paper, and performing supercalendering processing to obtain the base paper. The coated card has smooth surface, high whiteness and good ink absorption and adhesion performance. It is mainly used for offset printing and gravure printing of fine-mesh printed matters, such as high-grade picture books, calendars, books and periodicals, etc. The copperplate card has the defects that the powder is easy to stick and fall off after being wetted, can not be stored for a long time, has poor folding resistance and influences the use experience.
In addition, the coated card is an important printing and product packaging material, and the quality of the coated card directly determines the printing and packaging effects. With the rapid development of economy in China and the continuous improvement of the living standard of people, the printed matter and product packaging increasingly tend to be high-grade and exquisite, and the quality requirement on the art card is higher and higher. The interlayer bonding strength of the paperboard plays a crucial role in printing quality, and therefore, the problem that the interlayer bonding strength of the art card is required to be improved is urgently solved in the papermaking industry.
Patent CN102733250B discloses a art card, which comprises base paper and coatings formed on both sides of the base paper, wherein the pulp used for preparing the base paper comprises pulp and the mass parts of the pulp are as follows: 30-80 parts of bleached sulfate broad-leaved wood pulp, 0-30 parts of bleached sulfate softwood pulp, 0-30 parts of bleached chemi-mechanical groundwood pulp and 0-30 parts of alkaline hydrogen peroxide mechanical pulp; the mass percentage of ash content in the base paper is 5-20%; the paint coating the coating contains matt flaky china clay. The art card of the patent technology controls the roughness and the bulk of the base paper by adjusting the type and the proportion of the sizing agent of the base paper, the ash content of the base paper and the like, so that the paper of the art card is light and elegant in color, concave and convex in hand feeling and high in bulk; in addition, the matt flaky porcelain clay is added into the coating for coating, so that high coating sealing performance is obtained under the condition of less coating weight, and the printing effect of the copper plate card is good. However, the art card still does not overcome the technical problem of poor folding endurance, and the interlayer bonding strength is not ideal enough.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a production process of a folding-explosion-resistant art card, which has good folding resistance and high interlayer bonding strength.
In order to achieve the purpose, the invention adopts the following technical scheme:
a production process of an anti-fracture coated card comprises the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card.
Preferably, in step (1), the modified starch is prepared by the following method: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 5-7%, and drying to obtain the cassava starch.
Preferably, in the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 1.5-2.5: 0.6-0.8: 5-6: 1.5 to 2.5.
Preferably, in the step (1), the particle size of the ground calcium carbonate is 400 to 500 meshes.
Preferably, in the step (1), the grinding process conditions are as follows: 2 to 2.5kW for 50 to 60 minutes.
Preferably, in step (1), the mixture is ground and sieved with a 400-mesh sieve.
Preferably, in the step (2), the preparation method of the mixed pulp comprises the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
Preferably, the specific method of step (2) is: and (3) papermaking at a net part, feeding the mixed paper pulp onto a net, wherein the net speed is 700-800 m/min, forming and dewatering paper at the net part, and the papermaking raw paper is 145-315 gsm.
Preferably, in the step (3), the sizing is performed by the following specific method: coating starch dispersion liquid on the front side and the back side of the base paper, wherein the coating weight is 8-10 gsm, and the dispersion liquid is obtained by adding coating starch into water with the weight being 2-3 times of that of the coating starch, and stirring and dispersing the mixture uniformly.
Preferably, in the step (3), three times of coating, namely bottom coating, middle coating and top coating, are respectively carried out on the front surface and the back surface of the sized base paper, the used coating methods are all blade coating, and the coating weight of each time is 12-14 gsm; wherein, the paper sheet is dried before the primary coating until the water content (weight) is 4.5 percent, the paper sheet is dried before the secondary coating until the water content (weight) is 5.1 percent, and the paper sheet is dried before the top coating until the water content (weight) is 4.8 percent.
Further preferably, the drying method comprises the following specific steps: drying the mixture for 5 to 6 hours at the temperature of 40 to 50 ℃, then heating the mixture to 65 to 75 ℃, and preserving heat and drying the mixture to the required water content.
Further preferably, the paint used for the base coat is prepared by mixing the following components in parts by weight: 1-2 parts of polyoxyethylene, 25-30 parts of porcelain clay, 80-85 parts of ground calcium carbonate, 4-6 parts of styrene-butadiene latex, 0.01-0.02 part of polyether defoamer, 0.5-0.78 part of PEG-30000.3, 0.2-0.3 part of coating starch and 70-80 parts of water.
Further preferably, the coating used for the intermediate coating is prepared by mixing the following components in parts by weight: 1-2 parts of polyoxyethylene, 20-25 parts of porcelain clay, 85-90 parts of ground calcium carbonate, 4-6 parts of styrene-butadiene latex, 0.01-0.02 part of polyether defoamer, 0.5-0.5 part of PEG-30000.3, 0.4-0.5 part of coating starch and 70-80 parts of water.
Further preferably, the coating used for the top coating is prepared by mixing the following components in parts by weight: 1-2 parts of polyoxyethylene, 25-30 parts of porcelain clay, 80-85 parts of ground calcium carbonate, 3-5 parts of styrene-butadiene latex, 0.01-0.02 part of polyether defoamer, 0.5-0.78 part of PEG-30000.3, 0.2-0.3 part of coating starch and 60-70 parts of water.
The invention has the beneficial effects that:
firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coating starch; then, making the mixed paper pulp into paper and forming to obtain base paper; and then sizing the surface of the base paper by using coating starch, and then coating and calendaring the base paper by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card. The obtained coated card has good folding resistance (folding resistance is more than 15 times), and high interlayer bonding strength (180J/m)2Above), promoted paper quality, satisfied the high standard requirement to the art card.
The technical key of the invention lies in the application of the coating starch in the sizing and coating steps, the viscosity effect of which has a positive effect on the improvement of the folding resistance and the interlayer bonding strength of the coated card. And in the drying process, sufficient gelatinization time is given to the coated starch, the dehydration is stable, and various performances of the art card are further improved.
The coating starch is prepared by taking cassava starch as a raw material, the cassava starch has certain viscosity, and the effect between starch molecules can be weakened and the effect between the starch and other components can be enhanced through alkali treatment. The oxidation of sodium hypochlorite can oxidize hydroxymethyl in the modified starch into aldehyde group and carboxyl to enhance viscosity, and the ethylene-vinyl acetate copolymer can be esterified with the modified starch under the action of sodium tripolyphosphate to improve strength and folding resistance. The ground calcium carbonate expands when meeting water, which is beneficial to the diffusion of the coating starch and promotes the performance of the coating starch.
And (3) respectively carrying out three times of coating on the front surface and the back surface of the base paper after sizing, namely primary coating, intermediate coating and top coating, wherein the used coating methods are all blade coating, the water content before coating is controlled, and the formula of the coating used in each step is controlled, so that the binding force among layers is greatly enhanced, and various performances of the art card are further improved.
Detailed Description
The present invention will be further illustrated by the following examples, which are intended to be merely illustrative and not limitative.
Example 1
A production process of an anti-fracture coated card comprises the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card.
In the step (1), the preparation method of the modified starch comprises the following steps: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 5%, and drying to obtain the cassava starch.
In the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 2.5: 0.6: 6: 1.5.
in the step (1), the particle size of the ground calcium carbonate is 500 meshes.
In the step (1), the grinding process conditions are as follows: 2kW for 60 minutes.
In the step (1), the mixture is ground and sieved by a 400-mesh sieve.
In the step (2), the preparation method of the mixed pulp comprises the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
The specific method of the step (2) is as follows: the paper is made in the net part, the mixed pulp is put on the net, the net speed is 700m/min, the paper sheet is formed and dewatered in the net part, and the paper making base paper is 145 gsm.
In the step (3), the sizing method comprises the following specific steps: coating starch dispersion liquid on the front side and the back side of the base paper, wherein the coating weight is 8gsm, and the dispersion liquid is obtained by adding coating starch into 3 times of water and stirring and dispersing uniformly.
In the step (3), three times of coating, namely bottom coating, middle coating and top coating, are respectively carried out on the front surface and the back surface of the base paper after sizing is finished, the used coating methods are all scraper coating, and the coating weight of each time is 12 gsm; wherein, the paper sheet is dried before the primary coating until the water content (weight) is 4.5 percent, the paper sheet is dried before the secondary coating until the water content (weight) is 5.1 percent, and the paper sheet is dried before the top coating until the water content (weight) is 4.8 percent.
The specific drying method comprises the following steps: drying at 50 deg.C for 5 hr, heating to 75 deg.C, and oven drying to required water content.
The paint used for the base coat is prepared by mixing the following components: 1kg of polyethylene oxide, 30kg of porcelain clay, 80kg of ground calcium carbonate, 6kg of styrene-butadiene latex, 0.01kg of polyether defoamer, 0.2kg of PEG-30000.5kg of coating starch and 80kg of water.
The coating used for the intermediate coating is prepared by mixing the following components: 1kg of polyethylene oxide, 25kg of porcelain clay, 85kg of ground calcium carbonate, 6kg of styrene-butadiene latex, 0.01kg of polyether defoamer, 0.4kg of PEG-30000.5kg of coating starch and 80kg of water.
The coating used for the surface coating is prepared by mixing the following components: 1kg of polyethylene oxide, 30kg of porcelain clay, 80kg of ground calcium carbonate, 5kg of styrene-butadiene latex, 0.01kg of polyether defoamer, 0.2kg of PEG-30000.5kg of coating starch and 70kg of water.
Example 2
A production process of an explosion-resistant coated card comprises the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card.
In the step (1), the preparation method of the modified starch comprises the following steps: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 7%, and drying to obtain the cassava starch.
In the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 1.5: 0.8: 5: 2.5.
in the step (1), the particle size of the ground calcium carbonate is 400 mesh.
In the step (1), the grinding process conditions are as follows: 2.5kW for 50 minutes.
In the step (1), the mixture is ground and sieved by a 400-mesh sieve.
In the step (2), the preparation method of the mixed pulp comprises the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
The specific method of the step (2) is as follows: the paper is made in the net part, the mixed paper pulp is put on the net, the net speed is 800m/min, the paper sheet is formed and dewatered in the net part, and the paper making base paper is 315 gsm.
In the step (3), the sizing method comprises the following specific steps: coating starch dispersion liquid on the front side and the back side of base paper, wherein the coating weight is 10gsm, and the dispersion liquid is obtained by adding coating starch into water with the weight 2 times of that of the coating starch and stirring and dispersing uniformly.
In the step (3), the front surface and the back surface of the sized base paper are respectively coated for three times, namely primary coating, intermediate coating and surface coating, the used coating methods are all scraper coating, and the coating weight of each time is 14 gsm; wherein, the paper sheet is dried before the primary coating until the water content (weight) is 4.5 percent, the paper sheet is dried before the secondary coating until the water content (weight) is 5.1 percent, and the paper sheet is dried before the top coating until the water content (weight) is 4.8 percent.
The specific drying method comprises the following steps: drying at 40 deg.C for 6 hr, heating to 65 deg.C, and oven drying to required water content.
The paint used for the base coat is prepared by mixing the following components: 2kg of polyethylene oxide, 25kg of porcelain clay, 85kg of ground calcium carbonate, 4kg of styrene-butadiene latex, 0.02kg of polyether defoamer, 0.3kg of PEG-30000.3kg of coating starch and 70kg of water.
The coating used for the intermediate coating is prepared by mixing the following components: 2kg of polyethylene oxide, 20kg of porcelain clay, 90kg of ground calcium carbonate, 4kg of styrene-butadiene latex, 0.02kg of polyether defoamer, 0.5kg of PEG-30000.3kg of coating starch and 70kg of water.
The coating used for the surface coating is prepared by mixing the following components: 2kg of polyethylene oxide, 25kg of porcelain clay, 85kg of ground calcium carbonate, 3kg of styrene-butadiene latex, 0.02kg of polyether defoamer, 0.3kg of PEG-30000.3kg of coating starch and 60kg of water.
Example 3
A production process of an anti-fracture coated card comprises the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card.
In the step (1), the preparation method of the modified starch comprises the following steps: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 6%, and drying to obtain the cassava starch.
In the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 2: 0.7: 5.5: 2.
in the step (1), the particle size of the ground calcium carbonate is 500 meshes.
In the step (1), the grinding process conditions are as follows: 2.5kW for 55 minutes.
In the step (1), the mixture is ground and sieved by a 400-mesh sieve.
In the step (2), the preparation method of the mixed pulp comprises the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
The specific method of the step (2) is as follows: making paper in the net part, feeding the mixed pulp into the net at a net speed of 750m/min, forming and dewatering the paper sheet in the net part, and making paper base at 225 gsm.
In the step (3), the sizing method comprises the following specific steps: coating starch dispersion liquid on the front side and the back side of the base paper, wherein the coating weight is 9gsm, and the dispersion liquid is obtained by adding coating starch into water with the weight being 2.5 times of that of the coating starch, and stirring and dispersing the mixture uniformly.
In the step (3), three times of coating, namely bottom coating, middle coating and top coating, are respectively carried out on the front surface and the back surface of the base paper after sizing is finished, the used coating methods are all scraper coating, and the coating weight of each time is 13 gsm; wherein, the paper sheet is dried before the primary coating until the water content (weight) is 4.5 percent, the paper sheet is dried before the secondary coating until the water content (weight) is 5.1 percent, and the paper sheet is dried before the top coating until the water content (weight) is 4.8 percent.
The specific drying method comprises the following steps: drying at 45 deg.C for 5.5 hr, heating to 70 deg.C, and oven drying to required water content.
The paint used for the base coat is prepared by mixing the following components: 1.5kg of polyethylene oxide, 28kg of porcelain clay, 83kg of ground calcium carbonate, 5kg of styrene-butadiene latex, 0.015kg of polyether defoamer, 0.25kg of PEG-30000.4kg of coating starch and 75kg of water.
The coating used for the intermediate coating is prepared by mixing the following components: 1.5kg of polyethylene oxide, 22kg of porcelain clay, 88kg of ground calcium carbonate, 5kg of styrene-butadiene latex, 0.015kg of polyether defoamer, 0.45kg of PEG-30000.4kg of coating starch and 75kg of water.
The coating used for the surface coating is prepared by mixing the following components: 1.5kg of polyethylene oxide, 28kg of porcelain clay, 83kg of ground calcium carbonate, 4kg of styrene-butadiene latex, 0.015kg of polyether defoamer, 0.25kg of PEG-30000.4kg of coating starch and 65kg of water.
Comparative example
A production process of a coated card comprises the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating to obtain the coated card.
In the step (1), the preparation method of the modified starch comprises the following steps: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 6%, and drying to obtain the cassava starch.
In the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 2: 0.7: 5.5: 2.
in the step (1), the particle size of the ground calcium carbonate is 500 meshes.
In the step (1), the grinding process conditions are as follows: 2.5kW for 55 minutes.
In the step (1), the mixture is ground and sieved by a 400-mesh sieve.
In the step (2), the preparation method of the mixed pulp comprises the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
The specific method of the step (2) is as follows: the paper is made in the net part, the mixed pulp is put on the net, the net speed is 700m/min, the paper sheet is formed and dewatered in the net part, and the paper making base paper is 145 gsm.
In the step (3), the sizing method comprises the following specific steps: coating starch dispersion liquid on the front side and the back side of the base paper, wherein the coating weight is 9gsm, and the dispersion liquid is obtained by adding coating starch into water with the weight being 2.5 times of that of the coating starch, and stirring and dispersing the mixture uniformly.
In the step (3), three times of coating, namely bottom coating, middle coating and top coating, are respectively carried out on the front surface and the back surface of the base paper after sizing is finished, the used coating methods are all scraper coating, and the coating weight of each time is 12 gsm; wherein, the paper sheet is dried before the primary coating until the water content (weight) is 4.5 percent, the paper sheet is dried before the secondary coating until the water content (weight) is 5.1 percent, and the paper sheet is dried before the top coating until the water content (weight) is 4.8 percent.
The specific drying method comprises the following steps: drying at 45 deg.C for 5.5 hr, heating to 70 deg.C, and oven drying to required water content.
The paint used for the base coat is prepared by mixing the following components: 1.5kg of polyethylene oxide, 28kg of porcelain clay, 83kg of ground calcium carbonate, 5kg of styrene-butadiene latex, 0.015kg of polyether defoamer, 75kg of PEG-30000.4kg of water.
The coating used for the intermediate coating is prepared by mixing the following components: 1.5kg of polyethylene oxide, 22kg of porcelain clay, 88kg of ground calcium carbonate, 5kg of styrene-butadiene latex, 0.015kg of polyether defoamer, 75kg of PEG-30000.4kg of water.
The coating used for the surface coating is prepared by mixing the following components: 1.5kg of polyethylene oxide, 28kg of porcelain clay, 83kg of ground calcium carbonate, 4kg of styrene-butadiene latex, 0.015kg of polyether defoamer, PEG-30000.4kg and 65kg of water.
Test examples
Index tests are carried out on the coated cards obtained in the examples 1-3 and the comparative example, the folding endurance and the internal bonding strength of the coated cards are examined with reference to GB/T10335.4-2017, and the results are shown in Table 1.
TABLE 1 chromo board index test
| Folding endurance (horizontal, second) | Internal bond Strength (longitudinal, J/m)2) | |
| Example 1 | 15 | 185 |
| Example 2 | 16 | 187 |
| Example 3 | 18 | 191 |
| Comparative example | 9 | 135 |
As is clear from Table 1, the coated cards obtained in examples 1 to 3 were excellent in folding endurance and high in interlayer bonding strength.
The coating used in the coating treatment of the comparative example does not contain coating starch, and all properties of the obtained coated card are obviously poor, which shows that the specially prepared coating starch is beneficial to improving the folding resistance and the interlayer bonding strength of the coated card.
Although the present invention has been described with reference to the specific embodiments, it is not intended to limit the scope of the present invention, and various modifications and variations can be made by those skilled in the art without inventive changes based on the technical solution of the present invention.
Claims (9)
1. The production process of the anti-fracture coated card is characterized by comprising the following specific steps:
(1) firstly, cassava starch is used as a raw material, modified starch is obtained through alkali treatment, and then the modified starch is mixed with sodium hypochlorite, sodium tripolyphosphate, ethylene-vinyl acetate copolymer and ground calcium carbonate, ground and sieved to obtain coated starch;
(2) then, making the mixed paper pulp into paper and forming to obtain base paper;
(3) and (2) gluing the surface of the base paper by using the coating starch obtained in the step (1), and then coating and calendaring by using a coating containing the coating starch to obtain the anti-fracture and anti-explosion coated card.
2. The production process of the rupture-resistant coated card according to claim 1, wherein in the step (1), the modified starch is prepared by the following method: fully wetting the cassava starch by using a sodium hydroxide solution with the mass concentration of 5-7%, and drying to obtain the cassava starch.
3. The production process of the anti-explosion coated card according to claim 1, wherein in the step (1), the mass ratio of the modified starch, the sodium hypochlorite, the sodium tripolyphosphate, the ethylene-vinyl acetate copolymer and the ground calcium carbonate is 10: 1.5-2.5: 0.6-0.8: 5-6: 1.5 to 2.5.
4. The production process of the rupture-resistant coated card according to claim 1, wherein in the step (1), the grinding process conditions are as follows: 2 to 2.5kW for 50 to 60 minutes.
5. The process for producing the anti-fracture coated card according to claim 1, wherein in the step (2), the mixed paper pulp is prepared by the following steps: firstly, pulping bleached softwood pulp after crushing, screening and deslagging to obtain bleached softwood pulp with the freeness (c.s.f.) of 600 mL; then the bleached hardwood pulp board is pulped after being crushed, screened and deslagged to obtain bleached hardwood pulp with the freeness of 500 mL; and finally, mixing the bleached softwood pulp and the bleached hardwood pulp according to the mass ratio of 8: 2 stirring and mixing evenly to obtain the mixed paper pulp.
6. The production process of the rupture and explosion resistant coated card according to claim 1, wherein the specific method of the step (2) is as follows: and (3) papermaking at a net part, feeding the mixed paper pulp onto a net, wherein the net speed is 700-800 m/min, forming and dewatering paper at the net part, and the papermaking raw paper is 145-315 gsm.
7. The process for producing the anti-fracture coated card according to claim 1, wherein in the step (3), the sizing is performed by the following specific method: coating starch dispersion liquid on the front side and the back side of the base paper, wherein the coating weight is 8-10 gsm, and the dispersion liquid is obtained by adding coating starch into water with the weight being 2-3 times of that of the coating starch, and stirring and dispersing the mixture uniformly.
8. The production process of the anti-fracture coated card according to claim 1, characterized in that in the step (3), three times of coating, namely bottom coating, middle coating and top coating, are respectively carried out on the front surface and the back surface of the base paper after sizing, the used coating methods are all blade coating, and the coating weight of each time is 12-14 gsm; wherein, the paper sheet is dried before the primary coating until the water content is 4.5 percent, the paper sheet is dried before the secondary coating until the water content is 5.1 percent, and the paper sheet is dried before the top coating until the water content is 4.8 percent.
9. The production process of the rupture and explosion resistant coated card according to claim 8, wherein the specific drying method comprises the following steps: drying the mixture for 5 to 6 hours at the temperature of 40 to 50 ℃, then heating the mixture to 65 to 75 ℃, and preserving heat and drying the mixture to the required water content.
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| CN115142294A (en) * | 2022-06-17 | 2022-10-04 | 东莞建晖纸业有限公司 | White paperboard middle coating and production process thereof |
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