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Method for making low basis weight manila board from wood fiber

A low-quantity, white-on-gray technology, applied in pulp beating/refining methods, natural cellulose pulp/paper, papermaking, etc., can solve the problems of fiber performance degradation and increased production costs, and achieve low production costs and cost savings , Improve the effect of bulk

Active Publication Date: 2015-10-21
DONGGUAN NINE DRAGONS PAPER IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In the current waste paper and papermaking industry, gray-bottom whiteboard paper is mainly produced from waste paper, but the performance of fibers in waste paper is greatly reduced after repeated use. In order to ensure the various indicators of paper, most paper mills will Use high-priced waste paper raw materials or even add raw wood pulp to improve production, but this method will increase production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] A method of applying wood fiber to manufacture low-weight gray-bottomed white board paper, comprising the steps of:

[0065] A. Dissolving: Dispersing and dissolving wood fibers to obtain wood fiber pulp;

[0066] B, beating: beating the wood fiber slurry after the dissolving treatment;

[0067] C. Coarse screening: the wood fiber slurry after beating is subjected to coarse screening;

[0068] D. Purification: mix the wood fiber slurry treated with rough screening with MW slurry, and then go through fine screening, slag removal, concentration and thermal dispersion treatment to obtain the core layer slurry for manufacturing coated white board paper;

[0069] E. Papermaking: Process the surface layer slurry, liner layer slurry, bottom layer slurry and the core layer slurry prepared in step D to obtain low-weight gray-bottomed white board paper.

[0070] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 2%; the length of the ...

Embodiment 2

[0085] The difference between the present invention and above-mentioned embodiment 1 is:

[0086] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 3%; the length of the wood fiber in the wood fiber slurry is 0.3 cm, and the width is 0.08 mm.

[0087] In the step B, the pulp freeness is 600CSF; in the step C, the sieve aperture used for the coarse sieve is 2mm.

[0088] In the step D, the weight ratio of the wood fiber pulp to the MW pulp is 4:96, and the MW pulp is a mixed waste paper pulp with a brightness of 38% ISO.

[0089] In the step D, the sieve aperture used for the fine sieve is 0.1mm, and the fine sieve pressure is 200KPa.

[0090] The front precoating paint includes the following raw materials in parts by weight: 54 parts of calcium carbonate, 24 parts of kaolin, 10.4 parts of latex, 0.18 parts of anti-water agent, 0.02 part of defoamer, 0.05 part of dispersant, 0.03 part of bactericide, rheological 0.55 parts of impro...

Embodiment 3

[0098] The difference between the present invention and above-mentioned embodiment 1 is:

[0099] In the step A, the mass percentage concentration of the wood fiber in the wood fiber slurry is 3%; the length of the wood fiber in the wood fiber slurry is 0.4 cm, and the width is 0.1 mm.

[0100] In the step B, the pulp freeness is 625 CSF; in the step C, the sieve diameter used for the coarse screen is 3mm.

[0101] In the step D, the weight ratio of wood fiber pulp to MW pulp is 4:96, and the MW pulp is mixed waste paper pulp with a brightness of 40% ISO.

[0102] In the step D, the sieve aperture used in the fine sieve is 0.15mm, and the fine sieve pressure is 220KPa.

[0103] The front precoating paint comprises the following raw materials in parts by weight: 58 parts of calcium carbonate, 28 parts of kaolin, 10.8 parts of latex, 0.25 parts of anti-water agent, 0.02 part of defoamer, 0.06 part of dispersant, 0.03 part of bactericide, rheological 0.55 parts of improver and ...

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Abstract

The invention relates to the technical field of papermaking, in particular to a method for making a low basis weight manila board from wood fiber. The method comprises the steps of: A. dissolution, i.e. dispersing wood fiber and conducting dissolution treatment to obtain a wood fiber slurry; B. beating, i.e. conducting beating treatment on the wood fiber slurry subjected to dissolution treatment; C. coarse screening, i.e. conducting coarse screening treatment on the wood fiber slurry subjected to beating treatment; D. purification, i.e. mixing the wood fiber slurry subjected to coarse screening treatment with an MW slurry, then carrying out fine screening, slag removal, concentration and heat dispersion treatment, thus obtaining a core layer slurry for making coated white board paper; E. papermaking, i.e. processing a surface layer slurry, a lining slurry, a bottom slurry and the core layer slurry prepared by step D to obtain the low basis weight manila board. The method provided by the invention can effectively improve the bulkness of finished paper, reduces the paper basis weight exceeding problem, at the same time avoids the penetration point problem of thick and large wood fiber in finished paper, and greatly reduces the production cost.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a method for manufacturing low-weight gray-bottomed white board paper using wood fibers. Background technique [0002] In the current waste paper and papermaking industry, gray-bottom whiteboard paper is mainly produced from waste paper, but the performance of fibers in waste paper is greatly reduced after repeated use. In order to ensure the various indicators of paper, most paper mills will Use high-priced waste paper raw materials or even add raw wood pulp to improve production, but this method will increase production costs. Therefore, it is necessary to develop a method for producing gray-bottomed whiteboards that can increase the bulk of gray-bottomed whiteboards without increasing production costs. Contents of the invention [0003] In order to overcome the shortcomings and deficiencies existing in the prior art, the object of the present invention is to provide a m...

Claims

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Application Information

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IPC IPC(8): D21H11/00D21H11/14D21B1/34D21D1/30D21D5/02D21H19/80D21H19/44
Inventor 张成飞刘金山林新阳
Owner DONGGUAN NINE DRAGONS PAPER IND
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