High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating

A coating method and technology for coating paper, applied in paper coating, fiber raw material treatment, coating, etc., can solve problems such as paper becoming brittle, and achieve the goal of reducing processing load, production cost, dosage and bleaching energy consumption. Effect

Inactive Publication Date: 2011-09-28
TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, too high a coating weight (such as stone paper) may make the paper brittle

Method used

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  • High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] The method for producing high-whiteness coated paper from medium whiteness base paper and the coatings, ingredients and steps used are as follows:

[0050] (1) A kind of medium whiteness (about 74%) base paper, its slurry composition and weight ratio are:

[0051] Alkaline hydrogen peroxide mechanical pulp (PRC-APMP): 30%, whiteness 69% (GB / T 7974-2002, the same below);

[0052] Bleached softwood chemical pulp (NBKP): 30%, brightness 88%;

[0053] Bleached broadleaf chemical pulp (LBKP): 40%, brightness 85%;

[0054] The weight of the base paper produced is 100±2g / m 2 , the whiteness is 74%, ready for use after calendering.

[0055] (2) Use the coating device to implement primer coating, double-sided coating, and the coating amount on each side is 9-12g / m 2 . The paint formula is as follows: (the solid content of the paint is about 60%, the rest is water (the same below) and the pH is about 8.5)

[0056] Heavy calcium carbonate: 70 parts, 55 grades;

[0057] Kaolin...

Embodiment 2

[0078] The method for producing high-whiteness coated paper from medium whiteness base paper and the coatings, ingredients and steps used are as follows:

[0079] (1) The size composition and weight ratio of base paper (brightness is 80.5%) are:

[0080] Mechanical pulp (PRC-APMP): 20%, whiteness 74%;

[0081] Softwood chemical pulp: 30%, whiteness 89%;

[0082] Hardwood chemical pulp: 50%, whiteness 89%;

[0083] The weight of the base paper produced is 100±2g / m 2 , and the whiteness is 80.5% (distilled water copy sheet), and it is used after calendering.

[0084] (2) Use the coating device to apply the primer coating, double-sided coating, and the coating amount on each side is 9-12g / m 2 . The paint formula is as follows: (the solid content of the paint is about 60%, and the pH is about 8.5)

[0085] Heavy calcium carbonate: 70 parts, 55 grades;

[0086] Kaolin: 30 parts, more than 90% less than 2 microns;

[0087] Carboxylated styrene-butadiene latex: 8 parts;

[0...

Embodiment 3

[0102] The method for producing high-whiteness coated paper from medium whiteness base paper and the coatings, ingredients and steps used are as follows:

[0103] (1) A kind of medium-low whiteness base paper (about 61% of whiteness), its slurry is:

[0104] Softwood chemical pulp, whiteness 62%.

[0105] The pulp is obtained by bleaching unbleached softwood chemical pulp with a brightness of 24.0% with hydrogen peroxide.

[0106] The weight of the base paper produced is 70±2g / m 2 , the whiteness is 61%, ready for use after calendering.

[0107] (2) Use the coating device to apply the primer coating, double-sided coating, and the coating amount on each side is 12-15g / m 2 . The paint formula is as follows: (the solid content of the paint is about 60%, and the pH is about 8.5)

[0108] Heavy calcium carbonate: 60 parts, 55 grade slurry calcium;

[0109] Kaolin: 40 parts, more than 90% less than 2 microns;

[0110] Carboxylated styrene-butadiene latex: 8 parts;

[0111] S...

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Abstract

The invention relates to high-whiteness coated paper coated by using raw paper with medium whiteness, a coating method and a coating. The coating method is mainly characterized by greatly reducing the whiteness of the raw paper for producing conventional high-grade coated paper such as copper plate paper and coated white cardboards. The coating mode is a common single-side or double-side two-layer (double-coating) or multi-layer coating mode in a papermaking plant. By using the mechanical property of the raw paper, the printing property of coatings and the synergetic whitening effect between the coatings, yellowing of the raw paper is inhibited, and the whiteness of the coated paper is improved to over 86 percent so as to meet the requirements of national standards on the high-grade copper plate paper. The raw paper of the high-grade coated paper can be made by using various kinds of environment-friendly and resource-saving pulp of medium whiteness more widely, and is favorable for promoting the development of the low-carbon manufacturing technology of the pulping papermaking industry. The newly invented coated paper can substitute the traditional high-grade paper such as the copper plate paper, the coated white cardboards and the like in the fields of printing and packing.

Description

technical field [0001] The invention belongs to the field of pulping and papermaking, in particular to a medium whiteness base paper coated high whiteness coated paper, a coating method and the used coating. Background technique [0002] High-grade high-quality coated paper is generally produced with high-whiteness (commonly referred to as high-brightness internationally) coated base paper. For example, when producing high-quality coated paper whose whiteness meets the requirements of the national high-quality coated paper (GB / T 7974-2002 whiteness higher than 86%), the whiteness (ie brightness) of the base paper is usually similar to that of coated paper, generally at 85% Around, sometimes even as high as 95%, the pulp used is mainly bleached chemical pulp, and its brightness is generally not less than 88%. This base paper has good strength and optical properties, but is also relatively expensive. [0003] The wastewater pollutants in the paper industry mainly come from t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/82D21H19/84D21H19/54D21H21/18D21H21/30D21H19/64D21H19/60D21H19/52
CPCD21H19/54D21H21/28D21H21/30D21H19/40D21H19/822D21H19/52D21H19/60D21H19/385
Inventor 臧永华李星龙许英
Owner TIANJIN UNIVERSITY OF SCIENCE AND TECHNOLOGY
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