CN117364543A - High-whiteness and excellent-printing coated paper cup base paper and preparation method thereof - Google Patents

High-whiteness and excellent-printing coated paper cup base paper and preparation method thereof Download PDF

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Publication number
CN117364543A
CN117364543A CN202311674376.6A CN202311674376A CN117364543A CN 117364543 A CN117364543 A CN 117364543A CN 202311674376 A CN202311674376 A CN 202311674376A CN 117364543 A CN117364543 A CN 117364543A
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layer
pulp
coating
coating layer
parts
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CN117364543B (en
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刘望坤
张涛
刘金光
仇如全
刘卫华
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Shandong Bohui Paper Ind Co ltd
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Shandong Bohui Paper Ind Co ltd
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
    • D21H27/30—Multi-ply
    • 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
    • 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
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/08—Dispersing agents for fibres
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
    • Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics

Abstract

The invention discloses high-whiteness coated paper cup base paper with excellent printing and a preparation method thereof, and belongs to the technical field of papermaking. The technical proposal is as follows: the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer, wherein the front surface coating layer comprises the following raw materials: calcium carbonate, china clay, latex, dispersing agents, water-resistant agents, lubricants, naOH and sodium carboxymethyl cellulose; the front-side primer layer comprises the following raw materials: calcium carbonate, latex, dispersing agent, water-resistant agent, lubricant, naOH and sodium carboxymethyl cellulose; the back coating layer is starch. The invention improves the smoothness of the base paper and the formula of the coating, improves the ink absorbability of the coating, has flexible method, is convenient to realize and has lower cost.

Description

High-whiteness and excellent-printing coated paper cup base paper and preparation method thereof
Technical Field
The invention belongs to the technical field of papermaking, and particularly relates to high-whiteness and excellent-printing coated paper cup base paper and a preparation method thereof.
Background
At present, paper cup base paper in the market is divided into coated paper cup base paper and uncoated paper cup base paper, and the coated paper cup base paper is favored by people due to higher whiteness and excellent printing performance. The main stream of the coating on the market uses 100% American china clay, and the glossiness is high, but the high use level of the china clay, the low whiteness and the very easy streak generation during production lead to poor printing effect and low product qualification rate.
With the development of society and the increasing daily living standard of people, the current base paper of the coated paper cup can not fully meet the demands of consumers, and Chinese patent No. CN113250006A discloses a coating, coated paper, a preparation method thereof and a paper cup, wherein the coating comprises the following components: a mixture of polymers comprising a plurality of modified organic polymers, the modified organic polymers comprising acrylate modified polymers; the inorganic matters comprise at least one of talcum powder, porcelain clay and calcium carbonate; wherein the mass ratio of the polymer mixture in the coating is not less than 49 percent, and the mass ratio of the inorganic matters in the coating is not more than 51 percent, and the invention can enable the coating to be recyclable, degradable and compostable. However, it is difficult to meet the market demand for high whiteness and excellent printing quality food paper, and the high whiteness performance is mainly due to the quality of the coating and the microcosmic flatness of the base paper, so that the food paper with high whiteness and excellent printing quality needs to be developed.
Disclosure of Invention
The invention provides the high-whiteness coated paper cup base paper with excellent printing and the preparation method thereof, and the coating ink absorbency is improved by improving the flatness of the base paper and the coating formula, so that the method is flexible, convenient to realize and low in cost.
The technical scheme of the invention is as follows:
in a first aspect, a coated paper cup base paper of high whiteness and excellent printing is disclosed, comprising a base paper and a coating layer,
the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of bleached sulfate needle pulp and bleached sulfate broadleaf pulp, the core layer consists of alkaline hydrogen peroxide bleached mechanical pulp, bleached sulfate broadleaf pulp and bleached sulfate needle pulp, and the bottom layer consists of bleached sulfate needle pulp and bleached sulfate broadleaf pulp.
The front surface coating layer comprises the following raw materials in parts by weight:
80-87 parts of calcium carbonate, 13-20 parts of porcelain clay, 14-18 parts of latex, 0.15-0.25 part of dispersing agent, 0.25-0.45 part of hydration-resistant agent, 0.15-0.35 part of lubricant, 0.15-0.25 part of NaOH and 0.3-0.6 part of sodium carboxymethyl cellulose;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, 12-15 parts of latex, 0.1-0.2 part of dispersing agent, 0.2-0.4 part of hydration-resistant agent, 0.1-0.3 part of lubricant, 0.1-0.2 part of NaOH and 0.3-0.6 part of sodium carboxymethyl cellulose;
the back coating layer is starch;
the bleached sulfate needle pulp has long fiber length, high strength, high whiteness and highest price; the bleached sulfate broadleaf pulp fiber is short, inferior in strength, high in whiteness and low in price; the alkaline hydrogen peroxide bleached mechanical pulp has short fiber, low strength, low whiteness, high thickness and low price; surface/bottom layer: the bleached sulfate needle/broad-leaved pulp is positioned at the outermost layer, so that the whiteness and the strength are high; the reason why the proportion of NBKP of the bottom bleached sulfate needle pulp is higher than that of the surface layer is that: when the product is made into paper cup, the surface layer is a printing surface and is positioned outside, the bottom layer is in the cup, the cup mouth needs to be rolled outwards for a small circle to serve as a cup edge, the needle pulp ratio is high, the elongation of the paper can be improved, and the probability of bursting during hemming is reduced; the thickness of the core layer can be increased by using mechanical pulp, the cost is reduced, and the strength and whiteness of the bleached sulfate pulp can be increased;
the calcium carbonate can improve whiteness; the particle size is related to the roughness of the coating and the ink absorption and drying speed during printing, the particle size is small, the surface of the coating is smooth, the printing effect is good, but too small can lead to too smooth surface of the coating, slow ink absorption, slow drying speed and even adhesion; the particle size is large, the surface of the coating is rough, pits and depressions are formed, the impression after printing is poor, but the ink is fast to absorb and dry;
the porcelain clay can improve the glossiness, is brighter after printing, is attractive, but has low whiteness, high price, low whiteness caused by excessively high addition amount, high cost, easy flocculation of the porcelain clay, streaks generated during high-use amount coating, degradation of paper seeds, and reduction of the yield.
After the calcium carbonate with proper grain size and the porcelain clay are mixed according to a certain proportion, the whiteness, the luster and the cost are taken into account, meanwhile, because the grain sizes of the two are different, the porcelain clay with small grain size can be filled between the calcium carbonate with large grain size, and further the luster and the smoothness of the surface of the coating are improved.
Preferably, the weight ratio of the bleached sulfate needle pulp to the bleached sulfate broadleaf pulp in the surface layer is (30-40): (60-70); the weight ratio of the alkaline hydrogen peroxide bleached mechanical pulp, the bleached sulfate broadleaf pulp and the bleached sulfate needle pulp in the core layer is (50-60), the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp in the bottom layer is (20-30), the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp is (10-20), and the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp in the bottom layer is (40-50), and the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp is (50-60).
Preferably, the front surface coating layer has a coating weight of 13-15g/m 2 The front surface coating has a solid content of 65-67%, a viscosity of 1000-1300cps and a pH of 9.0-10.0; the front primer layer has a coating weight of 11-13g/m 2 The coating weight of the back coating layer is 0.5-1.5g/m 2 The front primer layer has a solids content of 66-68%, a viscosity of 900-1200cps, and a pH of 9.0-10.0. The solid content is high, the representative moisture is low, the required paint is low when the fixed coating amount is achieved, the moisture brought onto the paper is low, the paper is easy to dry, meanwhile, the moisture is low, the water absorption of the paper is low, and the strength loss is reduced; the solid content is too high, so that flocculation and agglomeration are easy, and streak paper diseases are easy to cause during coating; the viscosity affects the fluidity and the drying speed of the coating, and the viscosity is too high to affect the fluidity, so that the air in the coating is difficult to discharge, and the problems of foaming and streaking on the surface of the coating are caused; too low viscosityThe uneven feeding is easy to be caused during the coating, and the whiteness, the luster and the like of the paper are different; when the pH value of the paint is 9-10, the high-shear viscosity is reduced, the paint has good fluidity and stability, and good water retention performance.
Preferably, in the front surface coating layer, the mass ratio of the calcium carbonate particle diameter of not more than 2 μm is not less than 95%, and the whiteness is not less than 92%; the mass ratio of the porcelain clay with the grain diameter smaller than or equal to 2 μm is not smaller than 98%; the latex is styrene-acrylic latex; the waterproof agent is potassium zirconium carbonate, the lubricant is modified oxidized polyethylene polymer, and the dispersant is polyacrylate;
in the front surface bottom surface coating layer, the mass ratio of the calcium carbonate particle diameter to the calcium carbonate particle diameter is not less than 2 mu m and is not less than 60%, and the whiteness is not less than 92%; the latex is styrene-acrylic latex; the water resistant agent is zirconium potassium carbonate, the lubricant is modified oxidized polyethylene polymer, and the dispersing agent is polyacrylate.
The second aspect discloses a preparation method of the high-whiteness and excellent-printing coated paper cup base paper, which comprises pulping, high-concentration deslagging, pulping, pulp preparation, net forming, squeezing and dewatering, pre-drying, surface sizing, post-drying, belt calendering, coating, soft calendering, crimping, rewinding, slitting and packaging; the coating is to coat the front-side base coat layer on the basis of the base paper, then coat the back coat layer, and finally coat the front-side surface coat layer.
Preferably, the cationic polyacrylamide retention aid is adopted in the pulp preparation, the dosing position is positioned in front of the pressure screen, meanwhile, the anionic silica sol filter aid is adopted, and the dosing position is positioned behind the pressure screen, so that the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filter aid system is not less than 3m.
Preferably, 84 cast iron drying cylinders are adopted for front drying, the exhaust humidity of the front third cast iron drying cylinder is less than or equal to 120g/kgDA, and the exhaust humidity of the middle third cast iron drying cylinder is less than or equal to 150g/kgDA. The front drying process is carried out by using a dryer made of cast iron, when the wet paper sheet is dried, the dryer contacts with water vapor, rust is easy to occur, paper contacts with the surface of the dryer, rust is easy to adhere to the paper, and the paper cannot be used; to improve the occurrence of such situations, the following two methods are generally employed: a, spraying a tungsten carbide coating on a drying cylinder, wherein the tungsten carbide coating is high in price, so that only the part before pre-drying is generally sprayed; b, as the front part of the pre-drying is coated with the tungsten carbide coating, the probability of adhering rust exists when the pre-drying passes through the non-coated drying cylinder, in order to improve the condition, the humidity is controlled, the probability of rust generation of the drying cylinder can be effectively reduced by reducing the humidity, the humidity is high, and the non-coated drying cylinder is easy to generate rust; however, when the humidity is too low, the following risks exist: too low a humidity may be due to the wet sheet not being dried and the moisture not evaporating out, which results in the wet sheet entering the dryer in the subsequent stage, which is not sprayed, with a chance of sticking rust. Humidity control needs to be balanced according to actual production.
Preferably, 100% tapioca starch is adopted for the surface sizing, and steel belts are adopted for belt calendering to carry out calendering decoration on base paper at the temperature of not less than 180 ℃; and finishing the coated base paper by adopting two encapsulation ceramic rollers at the temperature of not less than 180 ℃ through soft calendering.
Preferably, the front surface base coat layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is more than or equal to 150 ℃ and the hot air temperature is more than or equal to 120 ℃ by adopting an infrared and hot air drying mode.
Preferably, the front surface coating layer is coated by a scraper, the coating weight is 13-15g, the front surface coating layer is dried after the coating is finished, and the front surface coating layer is dried by infrared and hot air, wherein the infrared temperature is more than or equal to 200 ℃ and the hot air temperature is more than or equal to 140 ℃.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the front surface coating layer and the front surface base coating layer adopt calcium carbonate as main components, so that the whiteness and fluidity of the coating layer are improved, and the coating efficiency is improved, and the front surface whiteness of the base paper of the coated paper cup prepared by the invention is high and is not less than 82% ISO, the printing performance is excellent, the glossiness is not less than 35%, the roughness is not more than 1.5 mu m, the smoothness is not less than 400S, the TV14 ink test is not less than 4 times, the CRODA ink test is 2-grade, and the K% N value is not less than 7.5%; the surface strength and interlayer bonding strength are high, the printing ink is suitable for high-speed printing, the ink absorptivity is good, the surface is smooth and fine, and the printing performance is excellent; high folding times, high elongation, no macula and adhesion, good ultrasonic adhesion, and good hot water and coffee penetration resistance.
2. The invention adopts a binary retention and filtration-aid system of cationic polyacrylamide retention aid and anionic silica sol filter aid in the pulp preparation, the distance is not less than 3m, the chemical and paper pulp fibers are given sufficient reaction time, the reaction flocculation between chemical is avoided, the retention of paper pulp fine fibers is improved, and the dehydration effect of the net part and the flatness of the base paper are improved.
3. The front surface coating layer, the front surface base coating layer and the back coating layer are coated for three times, so that the microcosmic flatness and whiteness of the base paper of the coated paper cup are improved, the printing effect is improved, and the back coating starch can effectively reduce the stress difference caused by overlarge coating quantity difference on the front surface and the back surface, reduce the warping of the paper and improve the surface strength.
4. The tapioca starch is adopted for surface sizing, the protein content is low, the amylose content is low, the quality is stable after enzymolysis, and the adhesion is not easy to cause.
Detailed Description
The lubricants used in the examples and comparative examples of the present invention were modified oxidized polyethylene polymers purchased from jersey biotechnology (su zhou) inc; the dispersant was polyacrylate and was purchased from conventional polymerization chemistry Co.
Example 1
The high-whiteness coated paper cup base paper with excellent printing comprises base paper and a coating layer, wherein the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the high whiteness and excellent printing coated paper cup base paper sequentially comprises a front surface coating layer, a front surface base coating layer, a surface layer, a core layer, a bottom layer and a back coating layer from top to bottom; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of 35 parts of bleached sulfate needle pulp and 65 parts of bleached sulfate broadleaf pulp in parts by weight, the core layer consists of 55 parts of alkaline hydrogen peroxide bleached mechanical pulp, 25 parts of bleached sulfate broadleaf pulp and 15 parts of bleached sulfate needle pulp in parts by weight, and the bottom layer consists of 40 parts of bleached sulfate needle pulp and 60 parts of bleached sulfate broadleaf pulp in parts by weight;
the front surface coating layer comprises the following raw materials in parts by weight:
85 parts of calcium carbonate, the grain diameter is less than or equal to 2 mu m, the proportion is 95 percent, and the whiteness is 92 percent; 15 parts of porcelain clay, the grain diameter is less than or equal to 2 mu m and the proportion is 98%; 16 parts of styrene-acrylic latex; 0.15 part of polyacrylate, 0.30 part of potassium zirconium carbonate, 0.25 part of modified oxidized polyethylene polymer, 0.15 part of NaOH and 0.35 part of sodium carboxymethyl cellulose;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, the proportion is 60%, and the whiteness is 92%; 13 parts of styrene-acrylic latex; 0.10 parts of polyacrylate, 0.30 parts of potassium zirconium carbonate, 0.20 parts of modified oxidized polyethylene polymer, 0.15 parts of NaOH and 0.45 parts of sodium carboxymethyl cellulose;
the back coating layer is starch.
The front surface coating layer coating amount was 14.5g/m 2 The front side coating had a solids content of 66.9%, a viscosity of 1280cps, and a pH of 9.32; the front primer layer has a coating weight of 12g/m 2 The coating weight of the back coating layer was 0.9g/m 2 The front primer layer had a solids content of 68%, a viscosity of 1050cps and a pH of 9.39.
The preparation method of the high-whiteness and excellent-printing coated paper cup base paper comprises the steps of pulping, high-concentration deslagging, pulping, pulp preparation, net forming, squeezing and dewatering, pre-drying, surface sizing, post-drying, belt type calendaring, coating, soft calendaring, curling, rewinding, slitting and packaging;
the coating is to coat a front-side base coating layer on the basis of base paper, then coat a back coating layer, and finally coat a front-side surface coating layer.
The cationic polyacrylamide retention aid is adopted in the pulp preparation, the addition amount of the cationic polyacrylamide retention aid is 400ppm of a surface layer, 250ppm of a core layer and 200ppm of a bottom layer, the adding position is positioned in front of a pressure screen, meanwhile, the addition amount of the anionic silica sol filter aid is 3kg/t, the core layer is 6kg/t, the bottom layer is 3kg/t, the excessive positive charges in a paper machine system are neutralized, and the adding position is positioned after the pressure screen, and the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filtration aid system is 3.5m.
The front drying adopts 84 cast iron drying cylinders, the exhaust humidity of the front third cast iron drying cylinder is 115g/kgDA, and the exhaust humidity of the middle third cast iron drying cylinder is 145g/kgDA.
The surface sizing adopts 100% tapioca starch, the belt calendering adopts a steel belt to carry out calendering decoration on base paper at 180 ℃; and the soft calendaring adopts two rubber covered ceramic rollers at 180 ℃ to finish the coated base paper.
The front-side primer layer is coated by a scraper, the coating weight is 12g, the front-side primer layer is dried after the coating is finished, and the front-side primer layer is dried by infrared and hot air, wherein the infrared temperature is 200 ℃ and the hot air temperature is 140 ℃.
The front surface coating layer is coated by a scraper, the coating weight is 14.5g, the front surface coating layer is dried after the coating is finished, and the front surface coating layer is dried by infrared and hot air, wherein the infrared temperature is 200 ℃ and the hot air temperature is 140 ℃.
In the process of the preparation method of the coated paper cup base paper, the process steps which are not specifically involved are all routine in the field and can be carried out according to routine operation in the field.
Example 2
The high-whiteness coated paper cup base paper with excellent printing comprises base paper and a coating layer, wherein the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of 35 parts by weight of bleached sulfate needle pulp and 65 parts by weight of bleached sulfate broadleaf pulp, the core layer consists of 60 parts by weight of alkaline hydrogen peroxide bleached mechanical pulp, 20 parts by weight of bleached sulfate broadleaf pulp and 20 parts by weight of bleached sulfate needle pulp, and the bottom layer consists of 40 parts by weight of bleached sulfate needle pulp and 60 parts by weight of bleached sulfate broadleaf pulp LBKP;
the front surface coating layer comprises the following raw materials in parts by weight:
87 parts of calcium carbonate, the grain diameter is less than or equal to 2 mu m, the proportion is 95 percent, and the whiteness is 92 percent; 13 parts of porcelain clay, the grain diameter is less than or equal to 2 mu m and the proportion is 98%; 14 parts of styrene-acrylic latex; 0.15 part of polyacrylate, 0.30 part of potassium zirconium carbonate, 0.25 part of modified oxidized polyethylene polymer, 0.15 part of NaOH and 0.35 part of sodium carboxymethyl cellulose;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, the proportion is 60%, and the whiteness is 92%; 13 parts of styrene-acrylic latex; 0.10 parts of polyacrylate, 0.30 parts of potassium zirconium carbonate, 0.20 parts of modified oxidized polyethylene polymer, 0.15 parts of NaOH and 0.45 parts of sodium carboxymethyl cellulose;
the front surface coating layer coating amount was 14.5g/m 2 The front side coating had a solids content of 66.8%, a viscosity of 1250cps, and a pH of 9.32; the front primer layer has a coating weight of 12g/m 2 The coating weight of the back coating layer was 0.9g/m 2 The front primer layer had a solids content of 68%, a viscosity of 1050cps and a pH of 9.38.
The preparation method of the high-whiteness and excellent-printing coated paper cup base paper comprises the steps of pulping, high-concentration deslagging, pulping, pulp preparation, net forming, squeezing and dewatering, pre-drying, surface sizing, post-drying, belt type calendaring, coating, soft calendaring, curling, rewinding, slitting and packaging;
the coating is to coat a front-side base coating layer on the basis of base paper, then coat a back coating layer, and finally coat a front-side surface coating layer.
The cationic polyacrylamide retention aid is adopted in the pulp preparation, the addition amount of the cationic polyacrylamide retention aid is 400ppm of a surface layer, 250ppm of a core layer and 200ppm of a bottom layer, the adding position is positioned in front of a pressure screen, meanwhile, the addition amount of the anionic silica sol filter aid is 3kg/t, the core layer is 6kg/t, the bottom layer is 3kg/t, the excessive positive charges in a paper machine system are neutralized, and the adding position is positioned after the pressure screen, and the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filtration aid system is 3.5m.
The front drying adopts 84 cast iron drying cylinders, the exhaust humidity of the front third cast iron drying cylinder is 115g/kgDA, and the exhaust humidity of the middle third cast iron drying cylinder is 145g/kgDA.
The surface sizing adopts 100% tapioca starch, the belt calendering adopts a steel belt to carry out calendering decoration on base paper at 180 ℃; and the soft calendaring adopts two rubber covered ceramic rollers at 180 ℃ to finish the coated base paper.
The front-side prime coating is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 150 ℃ and the hot air temperature is 120 ℃ by adopting an infrared and hot air drying mode.
The front surface coating layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 200 ℃ and the hot air temperature is 140 ℃ by adopting an infrared and hot air drying mode.
In the process of the preparation method of the coated paper cup base paper, the process steps which are not specifically involved are all routine in the field and can be carried out according to routine operation in the field.
Example 3
The high-whiteness coated paper cup base paper with excellent printing comprises base paper and a coating layer, wherein the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of 30 parts by weight of bleached sulfate needle pulp and 70 parts by weight of bleached sulfate broadleaf pulp, the core layer consists of 60 parts by weight of alkaline hydrogen peroxide bleached mechanical pulp, 30 parts by weight of bleached sulfate broadleaf pulp and 10 parts by weight of bleached sulfate needle pulp, and the bottom layer consists of 45 parts by weight of bleached sulfate needle pulp NBKP and 55 parts by weight of bleached sulfate broadleaf pulp;
the front surface coating layer comprises the following raw materials in parts by weight:
80 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, the proportion is 96%, and the whiteness is 92%; 20 parts of porcelain clay, the grain diameter value is less than or equal to 2 mu m, and the proportion is 98%; 18 parts of styrene-acrylic latex; 0.15 parts of polyacrylate; 0.25 parts of potassium zirconium carbonate; 0.15 parts of modified oxidized polyethylene polymer; 0.15 parts of NaOH; sodium carboxymethylcellulose 0.50 parts;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, the proportion is 60%, and the whiteness is 92%; 12 parts of styrene-acrylic latex; 0.15 parts of polyacrylate; 0.40 parts of potassium zirconium carbonate; 0.10 parts of modified oxidized polyethylene polymer; 0.20 parts of NaOH and 0.60 parts of sodium carboxymethylcellulose;
the front surface coating layer coating amount was 15.0g/m 2 The front side coating had a solids content of 66.9%, a viscosity of 1000cps, and a pH of 9.05; the front primer layer coating weight was 13.0g/m 2 The coating weight of the back coating layer was 0.5g/m 2 The front primer layer had a solids content of 66.2%, a viscosity of 900cps and a ph of 9.02.
The preparation method of the high-whiteness and excellent-printing coated paper cup base paper comprises the steps of pulping, high-concentration deslagging, pulping, pulp preparation, net forming, squeezing and dewatering, pre-drying, surface sizing, post-drying, belt type calendaring, coating, soft calendaring, curling, rewinding, slitting and packaging;
the coating is to coat a front-side base coating layer on the basis of base paper, then coat a back coating layer, and finally coat a front-side surface coating layer.
The cationic polyacrylamide retention aid is adopted in the pulp preparation, the addition amount of the cationic polyacrylamide retention aid is 400ppm of a surface layer, 250ppm of a core layer and 200ppm of a bottom layer, the adding position is positioned in front of a pressure screen, meanwhile, the addition amount of the anionic silica sol filter aid is 3kg/t, the core layer is 6kg/t, the bottom layer is 3kg/t, the excessive positive charges in a paper machine system are neutralized, and the adding position is positioned after the pressure screen, and the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filtration aid system is 3.5m.
The front drying adopts 84 cast iron drying cylinders, the exhaust humidity of the front third cast iron drying cylinder is 115g/kgDA, and the exhaust humidity of the middle third cast iron drying cylinder is 145g/kgDA.
The surface sizing adopts 100% tapioca starch, the belt calendering adopts a steel belt to carry out calendering decoration on base paper at 180 ℃; and the soft calendaring adopts two rubber covered ceramic rollers at 180 ℃ to finish the coated base paper.
The front-side primer layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 150 ℃ and the hot air temperature is 120 ℃ by adopting an infrared and hot air drying mode.
The front surface coating layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 200 ℃ and the hot air temperature is 140 ℃ by adopting an infrared and hot air drying mode.
In the process of the preparation method of the coated paper cup base paper, the process steps which are not specifically involved are all routine in the field and can be carried out according to routine operation in the field.
Example 4
The high-whiteness coated paper cup base paper with excellent printing comprises base paper and a coating layer, wherein the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of 40 parts by weight of bleached sulfate needle pulp and 60 parts by weight of bleached sulfate broadleaf pulp, the core layer consists of 50 parts by weight of alkaline hydrogen peroxide bleached mechanical pulp, 30 parts by weight of bleached sulfate broadleaf pulp and 20 parts by weight of bleached sulfate needle pulp, and the bottom layer consists of 50 parts by weight of bleached sulfate needle pulp and 50 parts by weight of bleached sulfate broadleaf pulp;
85 parts of calcium carbonate, the grain diameter is less than or equal to 2 mu m, the proportion is 95 percent, and the whiteness is 92 percent; 15 parts of porcelain clay, the grain diameter is less than or equal to 2 mu m and the proportion is 98%; 16 parts of styrene-acrylic latex; 0.25 part of polyacrylate, 0.45 part of potassium zirconium carbonate, 0.35 part of modified oxidized polyethylene polymer, 0.25 part of NaOH and 0.60 part of sodium carboxymethyl cellulose;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, the proportion is 60%, and the whiteness is 92%; 15 parts of styrene-acrylic latex; 0.2 parts of polyacrylate; 0.2 parts of zirconium potassium carbonate; 0.30 parts of modified oxidized polyethylene polymer; 0.10 parts of NaOH; sodium carboxymethylcellulose 0.3 part;
the front surface coating layer coating weight was 13g/m 2 The front side coating had a solids content of 65%, a viscosity of 1300cps, and a pH of 9.98; the front primer layer coating weight was 11g/m 2 The coating weight of the back coating layer was 1.5g/m 2 The front primer layer had a solids content of 68%, a viscosity of 1200cps and a pH of 9.97.
The preparation method of the high-whiteness and excellent-printing coated paper cup base paper comprises the steps of pulping, high-concentration deslagging, pulping, pulp preparation, net forming, squeezing and dewatering, pre-drying, surface sizing, post-drying, belt type calendaring, coating, soft calendaring, curling, rewinding, slitting and packaging;
the coating is to coat a front-side base coating layer on the basis of base paper, then coat a back coating layer, and finally coat a front-side surface coating layer.
The cationic polyacrylamide retention aid is adopted in the pulp preparation, the addition amount of the cationic polyacrylamide retention aid is 400ppm of a surface layer, 250ppm of a core layer and 200ppm of a bottom layer, the adding position is positioned in front of a pressure screen, meanwhile, the addition amount of the anionic silica sol filter aid is 3kg/t, the core layer is 6kg/t, the bottom layer is 3kg/t, the excessive positive charges in a paper machine system are neutralized, and the adding position is positioned after the pressure screen, and the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filtration aid system is 3.5m.
The front drying adopts 84 cast iron drying cylinders, the exhaust humidity of the front third cast iron drying cylinder is 115g/kgDA, and the exhaust humidity of the middle third cast iron drying cylinder is 145g/kgDA.
The surface sizing adopts 100% tapioca starch, the belt calendering adopts a steel belt to carry out calendering decoration on base paper at 180 ℃; and the soft calendaring adopts two rubber covered ceramic rollers at 180 ℃ to finish the coated base paper.
The front-side primer layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 150 ℃ and the hot air temperature is 120 ℃ by adopting an infrared and hot air drying mode.
The front surface coating layer is coated by a scraper, and is dried after the coating is finished, and the infrared temperature is 200 ℃ and the hot air temperature is 140 ℃ by adopting an infrared and hot air drying mode.
In the process of the preparation method of the coated paper cup base paper, the process steps which are not specifically involved are all routine in the field and can be carried out according to routine operation in the field.
Comparative example 1
Unlike example 1, in this comparative example, a coated paper cup base paper comprising a base paper and a coating layer, the base paper comprising a surface layer, a core layer and a bottom layer stacked in this order; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer; the surface layer consists of 20 parts by weight of bleached sulfate needle pulp and 80 parts by weight of bleached sulfate broadleaf pulp, the core layer consists of 70 parts by weight of alkaline hydrogen peroxide bleached mechanical pulp, 20 parts by weight of bleached sulfate broadleaf pulp and 10 parts by weight of bleached sulfate needle pulp, and the bottom layer consists of 25 parts by weight of bleached sulfate needle pulp and 75 parts by weight of bleached sulfate broadleaf pulp LBKP;
other preparation processes and conditions were the same as in example 1.
Comparative example 2
Unlike example 3, in this comparative example, the front surface coating layer includes the following raw materials in parts by weight:
80 parts of calcium carbonate, the particle size value is less than or equal to 2 mu m, and the ratio is 96%; 20 parts of porcelain clay, the grain diameter value is less than or equal to 2 mu m, and the proportion is 98%; 13 parts of styrene-acrylic latex; 0.15 parts of polyacrylate; 0.30 parts of potassium zirconium carbonate; 0.15 parts of modified oxidized polyethylene polymer; 0.15 parts of NaOH; sodium carboxymethylcellulose 0.50 parts;
other preparation processes and conditions were the same as in example 3.
Comparative example 3
Unlike example 1, the surface sizing used 50% tapioca starch and 50% corn starch, and the belt calendering used a steel belt to calender finish the base paper at 180 ℃; and the soft calendaring adopts two rubber covered ceramic rollers at 180 ℃ to finish the coated base paper.
The front-side prime coating is coated by a scraper, the coating weight is 12.0g, the drying treatment is carried out after the coating is completed, the infrared temperature is 150 ℃ and the hot air temperature is 120 ℃ by adopting an infrared and hot air drying mode.
The base papers prepared in examples 1-4, comparative examples 1-3 and the bid products were tested for performance and the bid products were purchased from Ningbo Asian pulp paper Co. Wherein IGT is surface strength, and means that paper has the capabilities of anti-linting, anti-dusting, anti-fuzzing and anti-layering when being subjected to ink stripping tension in the printing process. The IGT surface strength is consistent with the testing trend of the TV14 ink, and the difference is that the IGT detection area is small and the testing area of the TV14 ink is large; k & N ink absorption test is a method of evaluating ink absorption properties on paper, ensuring that ink is stably absorbed and penetrated on the surface of paper, and the specific results are shown in tables 1 and 2.
TABLE 1
TABLE 2
As can be seen from table 1 above, compared with example 1, the front side surface coating layer of example 2 has 2 parts of calcium carbonate, 2 parts of china clay and 2 parts of latex respectively, the front side whiteness is increased by 0.02, the glossiness is reduced by 0.9%, and the ultrasonic bonding strength is reduced by 5%; example 3 the front side surface coating layer calcium carbonate is reduced by 5 parts, the porcelain clay is increased by 5 parts, the latex is increased by 2 parts, the front side whiteness is reduced by 1.7%, and the glossiness is improved by 2%; example 4 the surface layer, the core layer and the bottom layer NBKP are improved in proportion, and the folding endurance and interlayer bonding strength are greatly improved. The coated paper cup base paper prepared in the examples 1-4 has high whiteness, high surface strength and interlayer bonding strength, is suitable for high-speed printing, and has good ink absorbability, smooth and fine surface and excellent printing performance; the folding-resistant time is high, the elongation is high, the hemming is not burst, the appearance is not yellow spot or adhesion, the ultrasonic bonding is good, the cup making effect is good, and the hot water and coffee permeation resistance is good.
As can be seen from table 2 above, the strength of the prepared coated paper cup base paper is reduced after the proportions of the top layer, the core layer, the bottom layer NBKP and the LBKP are varied in comparative example 1, and the strength is mainly expressed as: the interlayer bonding strength is reduced, the folding times are reduced, the elongation is reduced, and the initiation result is shown as follows: spraying film, foaming, printing, layering, foaming, and opening by cup rolling and mouth bursting.
As can be seen from table 2, after the parts of china clay and the parts of styrene-acrylic latex coated in comparative example 2 are changed, the prepared base paper of the coated paper cup has reduced whiteness, reduced IGT, reduced TV14 ink test times and reduced ultrasonic adhesion, and the following results are caused: low whiteness, paper hair and powder falling, and weak bonding during cup making.
As can be seen from table 2 above, after the humidity and the surface sizing starch process of comparative example 3 are changed, the prepared base paper of the coated paper cup has yellow spots and adhesion, and the following results are initiated: yellow dirt and sticky materials appear on the surface of the paper.
From table 2 above, it can be seen that, compared with the bid product, example 1 has high whiteness, good look, high IGT, suitability for high vehicle speed printing, low printing foaming probability, suitability for the current competitive printing industry, low roughness PPS, fine paper surface, exquisite printing, consistent folding resistance, better elongation than the bid product, less bursting of the cup opening during cup opening, no macula and adhesion condition, and better hot water permeation resistance and coffee permeation resistance than the bid product.

Claims (10)

1. The high whiteness coated paper cup base paper with excellent printing comprises base paper and a coating layer, and is characterized in that,
the base paper comprises a surface layer, a core layer and a bottom layer which are sequentially overlapped; the coating layer comprises a front surface coating layer, a front surface base coating layer and a back coating layer;
the surface layer consists of bleached sulfate needle pulp and bleached sulfate broadleaf pulp, the core layer consists of alkaline hydrogen peroxide bleached mechanical pulp, bleached sulfate broadleaf pulp and bleached sulfate needle pulp, and the bottom layer consists of bleached sulfate needle pulp and bleached sulfate broadleaf pulp;
the front surface coating layer comprises the following raw materials in parts by weight:
80-87 parts of calcium carbonate, 13-20 parts of porcelain clay, 14-18 parts of latex, 0.15-0.25 part of dispersing agent, 0.25-0.45 part of hydration-resistant agent, 0.15-0.35 part of lubricant, 0.15-0.25 part of NaOH and 0.3-0.6 part of sodium carboxymethyl cellulose;
the front surface primer layer comprises the following raw materials in parts by weight:
100 parts of calcium carbonate, 12-15 parts of latex, 0.1-0.2 part of dispersing agent, 0.2-0.4 part of hydration-resistant agent, 0.1-0.3 part of lubricant, 0.1-0.2 part of NaOH and 0.3-0.6 part of sodium carboxymethyl cellulose;
the back coating layer is starch.
2. The coated paper cup base stock with high whiteness and excellent printing according to claim 1, wherein the weight ratio of bleached sulfate needle pulp to bleached sulfate broadleaf pulp in the top layer is (30-40): 60-70; the weight ratio of the alkaline hydrogen peroxide bleached mechanical pulp, the bleached sulfate broadleaf pulp and the bleached sulfate needle pulp in the core layer is (50-60), the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp in the bottom layer is (20-30), the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp is (10-20), and the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp in the bottom layer is (40-50), and the weight ratio of the bleached sulfate needle pulp and the bleached sulfate broadleaf pulp is (50-60).
3. The high whiteness, print-good coated paper cup base stock according to claim 1, wherein the front side coating layer is coated withThe amount is 13-15g/m 2 The front surface coating has a solid content of 65-67%, a viscosity of 1000-1300cps and a pH of 9.0-10.0; the front primer layer has a coating weight of 11-13g/m 2 The coating weight of the back coating layer is 0.5-1.5g/m 2 The front primer layer has a solids content of 66-68%, a viscosity of 900-1200cps, and a pH of 9.0-10.0.
4. The coated paper cup base stock with high whiteness and excellent printing according to claim 1, wherein in the front surface coating layer, the mass ratio of the calcium carbonate particle diameter of 2 μm or less is not less than 95%, and the whiteness is not less than 92%; the mass ratio of the porcelain clay with the grain diameter smaller than or equal to 2 μm is not smaller than 98%; the latex is styrene-acrylic latex; the waterproof agent is potassium zirconium carbonate, the lubricant is modified oxidized polyethylene polymer, and the dispersant is polyacrylate;
in the front surface bottom surface coating layer, the mass ratio of the calcium carbonate particle diameter to the calcium carbonate particle diameter is not less than 2 mu m and is not less than 60%, and the whiteness is not less than 92%; the latex is styrene-acrylic latex; the water resistant agent is zirconium potassium carbonate, the lubricant is modified oxidized polyethylene polymer, and the dispersing agent is polyacrylate.
5. The method for preparing high whiteness, excellent printing coated paper cup base paper according to any one of claims 1 to 4, comprising pulping, high consistency deslagging, beating, pulp preparation, net forming, press dehydration, pre-drying, surface sizing, post-drying, belt calendering, coating, soft calendering, curling, rewinding, slitting and packaging;
the coating is to coat the front-side base coat layer on the basis of the base paper, then coat the back coat layer, and finally coat the front-side surface coat layer.
6. The method for preparing high whiteness coated paper cup base paper with excellent printing according to claim 5, wherein the cationic polyacrylamide retention aid is adopted in the pulp preparation, the adding position is positioned in front of a pressure screen, the anionic silica sol filter aid is adopted at the same time, and the distance between the cationic polyacrylamide retention aid system and the anionic silica sol filter aid system is not less than 3m after the adding position is positioned behind the pressure screen.
7. The method for preparing high whiteness, excellent printing coated paper cup base paper according to claim 5, wherein the front drying adopts a drying cylinder, the exhaust humidity of the front third drying cylinder is less than or equal to 120g/kgDA, and the exhaust humidity of the middle third drying cylinder is less than or equal to 150g/kgDA.
8. The method for producing a coated paper cup base paper of high whiteness and excellent printing according to claim 5, wherein the surface sizing is 100% tapioca starch, and the belt calendering is carried out by calendering finishing the base paper with a steel belt at 180 ℃ or more; and finishing the coated base paper by adopting two encapsulation ceramic rollers at the temperature of not less than 180 ℃ through soft calendering.
9. The method for preparing high whiteness, excellent printing coated paper cup base paper according to claim 5, wherein the front side primer layer is coated by a doctor blade, and after the coating is completed, the paper cup base paper is dried by infrared and hot air, the infrared temperature is not less than 150 ℃, and the hot air temperature is not less than 120 ℃.
10. The method for preparing high whiteness, excellent printing coated paper cup base paper according to claim 5, wherein the front surface coating layer is coated by a doctor blade, the coating weight is 13-15g, the drying treatment is carried out after the coating is completed, the infrared temperature is more than or equal to 200 ℃ and the hot air temperature is more than or equal to 140 ℃ by adopting an infrared and hot air drying mode.
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