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Carbonless copy paper

A carbonless copy paper and base paper technology, applied in paper, papermaking, paper coating, etc., can solve problems such as white spots, affecting the quality of carbonless copy paper, and fiber exposure, so as to improve color development and printing, reduce white spots, and fill The effect of holes in the paper surface

Active Publication Date: 2012-08-01
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By increasing the speed of the curtain coater to increase the output of carbonless copy paper, there will be white spots and missing coatings during the coating process, which will affect the quality of carbonless copy paper
In addition, most of the base paper surface of carbonless copy paper has defects such as exposed fibers, holes, and rough appearance, which greatly affect the quality of carbonless copy paper

Method used

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  • Carbonless copy paper
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Examples

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preparation example Construction

[0015] A carbonless copy paper 100 of a preferred embodiment of the present invention (such as figure 1 Shown) the preparation method, it comprises the steps:

[0016] (1) Provide initial raw paper 10

[0017] The base paper 10 is the base paper of common carbonless copy paper, preferably one or both of hardwood pulp (LBKP), softwood pulp (NBKP) and chemithermomechanical pulp (BCTMP) and hardwood pulp The mixed pulp is made by papermaking, and the mass percentage of hardwood pulp is 70-100%, the mass percentage of softwood pulp is 0-10%, and the mass percentage of chemical thermomechanical pulp is 0-20% . The slurry of the papermaking base paper 10 is added with appropriate chemicals, dry strength agents, etc. to ensure the strength of the base paper 10 and to ensure the smooth progress of the subsequent coating process.

[0018] For the physical property index of the base paper 10, it is mainly necessary to control its sizing degree, COBB value (paper water absorption perf...

Embodiment 1

[0044] Base paper 10: 100% hardwood pulp is used as the pulp, and its grammage is 46gsm (gram per square meter, gram per square meter).

[0045] The first coating liquid formula: 60 parts of calcium carbonate, 40 parts of adhesive (latex, starch, etc. mixed at a ratio of 2:3), and 10 parts of cationic paraffin emulsion.

[0046] The second coating solution formula: 60 parts of calcium carbonate as pigment, 40 parts of china clay, 12 parts of tapioca starch as starch, 12 parts of styrene-butadiene latex as latex, 22 parts of zinc salicylate as developer, and sulfonated surfactant as 0.5 part of succinate, 0.8 part of sodium hexametaphosphate as dispersant.

Embodiment 2

[0048] Base paper 10: The pulp is a mixed pulp of 90% hardwood pulp and 10% chemical thermomechanical pulp, and the grammage is 46gsm.

[0049] The first coating liquid formula: 55 parts of calcium carbonate, 45 parts of adhesive, and 5 parts of cationic paraffin emulsion are used.

[0050] The second coating solution formula: the same as the second coating solution in Example 1.

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Abstract

The invention discloses carbonless copy paper. The carbonless copy paper comprises base paper, a pre-coating formed on the surface of the base paper and a color development layer formed on the surface of the pre-coating, wherein the pre-coating contains filler and adhesive, or the pre-coating contains filler, adhesive and wax substance; and the pre-coating contains 50 to 60 mass percent of filler, 40 to 50 mass percent of adhesive, and 0 to 10 mass percent of wax substance. Because the pre-coating is coated on the surface of the base paper, exposure of fibers on the surface of the base paper can be reduced, holes in the surface of the paper are filled, problems about missing coating, shifting and the like in the subsequent process of coating the color development layer can be solved, the color development layer is coated uniformly, exposure points are reduced, and color development and printing of the color development layer are greatly improved. Moreover, the invention also provides a preparation method for the carbonless copy paper.

Description

technical field [0001] The invention relates to a carbonless copy paper. Background technique [0002] Carbonless copy paper is a novel copy paper, its surface is coated with a special coating, which contains pressure-sensitive and electron-donating leuco dyes and electron-accepting acidic color-developing materials. The colorless dye reacts with the color-developing material to develop color directly on the paper, thereby displaying text, patterns and other information on the paper. At present, manufacturers hope to reduce their production costs as much as possible while ensuring the quality of carbonless copy paper. By increasing the speed of the curtain coating machine to increase the output of carbonless copy paper, there will be white spots and missing coatings during the coating process, which will affect the quality of carbonless copy paper. In addition, most of the surface of the base paper of carbonless copying paper has defects such as exposed fibers, holes, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H19/38D21H19/44D21H19/54D21H21/14D21H21/08D21H21/24
Inventor 陈汉彬李娟
Owner GOLD EAST PAPER JIANGSU
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