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Kraft paper and making method thereof

A technology of kraft paper and base paper, which is applied in pulp beating method, papermaking, paper coating, etc., can solve the problems of low burst index, tear index, dull printing color, rough surface, etc., and achieve excellent printing performance, good appearance, The effect of improving the bursting strength

Active Publication Date: 2013-12-04
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the kraft paper produced by the prior art has low burst index and tear index, and is prone to rupture.
In addition, uncoated kraft paper has rough surface, loose texture, strong ink absorption, and dull printing color.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation method of kraft paper of the present invention, it comprises the steps:

[0018] (1) Preparation of base paper: bleached softwood kraft chemical pulp and hardwood kraft chemical bleached pulp are pulped and beaten respectively, wherein the beating degree of softwood is 25-30°SR, and the beating degree of hardwood is 34-40°SR ; The softwood kraft bleached chemical pulp after beating is mixed with the hardwood kraft bleached chemical pulp after beating, and then the base paper is obtained through net forming, pressing, drying, coiling and calendering.

[0019] (2) Preparation of paint: mix starch and pigment according to the mass ratio of (50-80): (20-50), add water to prepare an aqueous solution with a concentration of 35%-40% by mass, and heat it at 120-130°C Co-cooking at high temperature prepares the coating, and adjusts the viscosity of the coating to 30-50 cps by adding water or not adding water.

[0020] (3) Coating coating: coating the coating on ...

Embodiment 1

[0024] Base paper: The pulp used in the base paper contains 60% by mass of softwood kraft bleached chemical pulp and 40% by mass of hardwood kraft bleached chemical pulp; Leaf wood kraft bleached chemical pulp is pulped and beaten separately (coniferous wood beating degree is 25°SR, hardwood beating degree is 40°SR), and then mixed together, and then formed on the net, pressed, dried, coiled, pressed The light is made of kraft base paper.

[0025] Coating: mix tapioca oxidized starch and pigments (calcium carbonate and talcum powder) according to the mass ratio of tapioca oxidized starch, calcium carbonate and talcum powder in a ratio of 80:18:2, add water to prepare a 38.5% aqueous solution , cooking at a temperature of 130° C. to obtain a coating, the viscosity of which is 48.5 cps; coating the coating on the surface of base paper to obtain kraft paper.

[0026] For the kraft paper prepared in this example, the dry mass ratio of the base paper to the coating is 85:15.

Embodiment 2

[0028] Base paper: the pulp used in the base paper contains 55% by mass of softwood kraft bleached chemical pulp and 45% by mass of hardwood kraft bleached chemical pulp; Leaf wood kraft bleached chemical pulp is pulped and beaten separately (coniferous wood beating degree is 28°SR, hardwood beating degree is 36°SR), and then mixed together, and then it is formed on the net, pressed, dried, coiled, and pressed. The light is made of kraft base paper.

[0029] Coating: mix cassava oxidized starch and pigment (calcium carbonate) according to the mass ratio of 65:35, add water to prepare an aqueous solution with a concentration of 39.1% by mass, cook at a temperature of 130°C to obtain a coating, and the viscosity of the coating is It is 35.1cps; the coating is coated on the base paper surface to make kraft paper.

[0030] For the kraft paper prepared in this example, the dry mass ratio of the base paper to the coating is 88:12.

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Abstract

The invention provides a kraft paper. The kraft paper comprises a raw paper and a coat formed on one side or double sides of the raw paper, and the absolute dry mass ratio of the raw paper to the coat is (85-90):(10-15). A paper pulp making the raw paper is a mixed pulp prepared through a step of respectively beating a bleached chemical softwood kraft pulp and a bleached chemical hardwood kraft pulp and a step of mixing, and the beating degree of the softwood pulp is lower than the beating degree of the hardwood pulp; the mass percentage content of the softwood pulp is 50-60%, and the mass percentage content of the hardwood pulp is 40-50%; and the coat is prepared through coating a coating containing co-boiled starch and pigment. The invention also provides a making method of the kraft paper. The kraft paper has a high bursting strength.

Description

technical field [0001] The invention relates to kraft paper and a preparation method thereof. Background technique [0002] Currently, the market demand for packaging paper is great. Kraft paper is very suitable for use as packaging paper due to its excellent tensile properties. However, the kraft paper produced by the prior art has a lower burst index and a lower tear index, and is prone to cracking. In addition, uncoated kraft paper has rough surface, loose texture, strong ink absorption, and dull printing color. Contents of the invention [0003] In view of this, it is necessary to provide a kraft paper that can effectively solve the above problems. [0004] In addition, it is also necessary to provide a method for preparing the above-mentioned kraft paper. [0005] A kraft paper comprising base paper and coatings formed on one or both sides of the base paper, the absolute dry mass ratio of the base paper to the coating is (85-90):(10-15), the base paper is made of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H11/04D21D1/02D21H19/40D21H19/38D21H19/54
Inventor 张菊仙王仁荣张明
Owner GOLD EAST PAPER JIANGSU
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