Preparation technology for craft paper and paint for coating craft paper

A preparation process, kraft paperboard technology, applied in paper coating, pulp raw material addition process, papermaking, etc., can solve the problems of poor printing performance, quality that cannot meet people's needs, easy to yellow, etc.

Inactive Publication Date: 2012-07-18
FUYANG MAOHONG PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the layered structure, different raw materials can be used for each layer. For example, the surface layer can use primary slurry, and the remaining layers can use secondary slurry. Carpenter is used as a raw material to manufacture, and the cost is low, but the printing performance is poor due to its rough and smooth surface, and it is easy to turn yellow
With the improvement of people's living standards, people's pursuit of packaging quality is getting higher and higher, so the requirements for the gloss, durability, water resistance and other properties of kraft cardboard are also getting higher and higher. The existing kraft cardboard The quality of paper can no longer meet people's needs
[0003] A patent with the announcement number "CN 101581055 B" and the announcement date of 2011.11.16 discloses a light-coated white-faced kraft cardboard and its manufacturing method. It coats a layer of paint on the surface of the white cardboard and retains the base paper. The strength of the white card can increase the carton output per unit weight with a low quantitative, but this white card has not fully improved the performance of the paper, and its gloss, smoothness and printability have not been improved.

Method used

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  • Preparation technology for craft paper and paint for coating craft paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation process for kraft cardboard, comprising: preparation of surface layer slurry, liner layer slurry and bottom layer slurry; surface layer slurry, liner layer slurry and bottom layer slurry are prepared by papermaking; base paper is pressed, dried and The pre-calendering process; the coating process of base paper; the post-treatment process after coating; the coating process of base paper includes the following steps:

[0025] (1) Pigment dispersion: add an appropriate amount of water into the disperser, and adjust the pH of the water to 6.0 by adding sodium hydroxide or ammonia water, then add sodium polyacrylate and stir at low speed for 7 minutes, then add kaolin and stir at high speed for 10 minutes, then add kaolin and heavy calcium carbonate totaling 100 parts, add the corresponding heavy calcium carbonate, and stir at high speed for 5 minutes, wherein the particle size of kaolin is less than or equal to 2 μm, wherein the kaolin with a particle size of l...

Embodiment 2

[0031] A preparation process for kraft cardboard, comprising: preparation of surface layer slurry, liner layer slurry and bottom layer slurry; surface layer slurry, liner layer slurry and bottom layer slurry are prepared by papermaking; base paper is pressed, dried and The pre-calendering process; the coating process of base paper; the post-treatment process after coating; the coating process of base paper includes the following steps:

[0032] (1) Pigment dispersion: add an appropriate amount of water into the disperser, and adjust the pH of the water to 6.3 by adding sodium hydroxide or ammonia water, then add sodium polyacrylate and stir at low speed for 10 minutes, then add kaolin and stir at high speed for 5 minutes, then add kaolin and heavy calcium carbonate totaling 100 parts, add the corresponding heavy calcium carbonate, and stir at a high speed for 7 minutes, wherein the particle size of kaolin is less than or equal to 2 μm, and the kaolin with a particle size of les...

Embodiment 3

[0038] A preparation process for kraft cardboard, comprising: preparation of surface layer slurry, liner layer slurry and bottom layer slurry; surface layer slurry, liner layer slurry and bottom layer slurry are prepared by papermaking; base paper is pressed, dried and The pre-calendering process; the coating process of base paper; the post-treatment process after coating; the coating process of base paper includes the following steps:

[0039] (1) Pigment dispersion: Add an appropriate amount of water into the disperser, and adjust the pH of the water to 6.6 by adding sodium hydroxide or ammonia water, then add sodium polyacrylate and stir at low speed for 5 minutes, then add kaolin and stir at high speed for 9 minutes, then add kaolin and heavy calcium carbonate totaling 100 parts, add the corresponding heavy calcium carbonate, and stir at a high speed for 10 minutes, wherein the particle size of kaolin is less than or equal to 2 μm, and the kaolin with a particle size of les...

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Abstract

The invention relates to a preparation technology for craft paper in the field of paper making and paint for coating craft paper. The paint for coating craft paper comprises the following components of: kaolin, ground limestone, sodium polyacrylate, nano silica, basalt fibre, CMC (carboxy methylated cellulose), oxidized starch, styrene butadiene latex, an antifoaming agent, a water-proofing agent, antiseptics, a brightening agent, a lubricating agent, a water-resistant agent and appropriate amount of water, wherein the pH value of the paint is regulated to be 6.0-6.6, the solid content is 61-67%, and the paint is configured to coat raw paper. The paint-coated craft paper prepared by the preparation technology for the craft paper has higher smoothness, glossiness and strength and has better illumination resistance and radiation resistance, and the printability is better.

Description

technical field [0001] The invention relates to the field of papermaking, in particular to a preparation process of kraft cardboard and a coating material for coating thereof. Background technique [0002] Kraft cardboard has high strength and high whiteness on one side, so it is widely used in packaging materials. It usually includes a surface layer, a core layer and a bottom layer, and the coated kraft cardboard is obtained by coating the paint on the surface layer. Due to the layered structure, different raw materials can be used for each layer. For example, the surface layer can use primary slurry, and the remaining layers can use secondary slurry. Carpentry is used as a raw material to manufacture, and the cost is relatively low, but the printing performance is poor due to the roughness and smoothness of the surface, and it is easy to turn yellow. With the improvement of people's living standards, people's pursuit of packaging quality is getting higher and higher, so ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/40D21H19/56D21H23/02
Inventor 蔡维明蒋生根
Owner FUYANG MAOHONG PAPER
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