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Preparation method of high-whiteness high-strength carbonless copy paper base paper

A carbonless copy paper, high-strength technology, applied in the field of papermaking, can solve the problems of reducing the shrinkage rate of carbonless copy paper base paper, weakening the bonding force between fibers, and reducing the shrinkage rate of base paper, so as to avoid surface coating performance, reduce shrinkage rate, Effect of improving waterproof and moisture-proof performance

Active Publication Date: 2020-09-25
XIANHE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the shrinkage rate of the base paper of carbonless copy paper by adding fillers in the prior art, so as to prevent the internal stress caused by drying shrinkage from causing some microcapsules to displace and rupture and reduce the color rendering effect; however, adding fillers will cause fiber The binding force between them is weakened, resulting in a decrease in the strength of the base paper, and the problem of powder shedding and hair loss is prone to occur after coating. A method for preparing a high-white and high-strength carbonless copy paper base paper is provided. Adding alkyl chitosan to the slurry to modify Talc powder is used as a filler, and the alkyl chitosan on the surface of the filler can form hydrogen bonds with the fiber, so that the filler and the fiber can be connected through the alkyl chitosan, thereby reducing the shrinkage of the base paper and effectively improving the quality of the base paper. strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A preparation method of high-white high-strength carbonless copy paper base paper, comprising the steps of:

[0036] (1) Pulping: after beating, mix pulp to get slurry, slurry includes 45% bleached natural softwood pulp and 55% bleached hardwood pulp, the beating degree of slurry is 53oSR, wet weight 4g; It is the alkyl chitosan modified talc powder of 280kg that adding ton of paper consumption is, the PAE wet strength agent (solid content 15%) of 12kg, 8kg cationic starch and 15kg AKD;

[0037] (2) papermaking: after papermaking the slurry on the Internet, wet paper sheets are obtained;

[0038] (3) Pressing and pre-drying: press and pre-dry the wet paper sheets to obtain pre-dried paper sheets. The pressing adopts two presses, the pressure of the first press line is 0.45Mpa, and the pressure of the second press line is 0.25Mpa;

[0039] (4) Surface sizing: use AKD surface sizing agent to carry out surface sizing on the paper sheet, and the sizing amount is 4g / m 2 ; ...

Embodiment 2

[0047] A preparation method of high-white high-strength carbonless copy paper base paper, comprising the steps of:

[0048] (1) Pulping: after beating, mix pulp to obtain slurry, which includes 40% bleached natural softwood pulp and 60% bleached hardwood pulp. The beating degree of slurry is 50oSR, and the wet weight is 3g; It is the alkyl chitosan modified talc powder of 250kg that adding ton of paper consumption is, the PAE wet strength agent (solid content 15%) of 10kg, 5kg cationic starch and 10kg AKD;

[0049] (2) papermaking: after papermaking the slurry on the Internet, wet paper sheets are obtained;

[0050] (3) Pressing and pre-drying: press and pre-dry the wet paper sheets to obtain pre-dried paper sheets. The pressing adopts two presses, the pressure of the first press line is 0.4Mpa, and the pressure of the second press line is 0.3Mpa;

[0051] (4) Surface sizing: use AKD surface sizing agent to carry out surface sizing on the paper sheet, and the sizing amount is...

Embodiment 3

[0059] A preparation method of high-white high-strength carbonless copy paper base paper, comprising the steps of:

[0060] (1) Pulping: after beating, mix pulp to obtain slurry, slurry includes 50% bleached natural softwood pulp and 50% bleached hardwood pulp, the beating degree of slurry is 55oSR, wet weight 5g; It is the alkyl chitosan modified talc powder of 300kg that adding ton of paper consumption is, the PAE wet strength agent (solid content 15%) of 15kg, 10kg cationic starch and 20kg AKD;

[0061] (2) papermaking: after papermaking the slurry on the Internet, wet paper sheets are obtained;

[0062] (3) Pressing and pre-drying: press and pre-dry the wet paper sheets to obtain pre-dried paper sheets. The pressing adopts two presses, the pressure of the first press line is 0.5Mpa, and the pressure of the second press line is 0.2Mpa;

[0063] (4) Surface sizing: use AKD surface sizing agent to carry out surface sizing on the paper sheet, and the sizing amount is 3g / m 2 ...

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Abstract

The invention relates to a preparation method of high-whiteness high-strength carbonless copy paper base paper, which comprises the following steps: (1) pulping: pulping raw materials and blending thepulp, and adding 250-300 kg of alkyl chitosan modified talcum powder, 10-15kg of PAE wet strength agent, 5-10kg of intra-pulp glue and 10-20kg of AKD into each ton of the pulp; (2) papermaking: papermaking the pulp on a net to obtain a wet paper sheet; (3) squeezing and pre-drying: squeezing and pre-drying the wet paper sheet to obtain a pre-dried paper sheet; (4) surface sizing; and (5) drying and calendaring. The alkyl chitosan modified talcum powder is added into the pulp to serve as filler, alkyl chitosan on the surface of the filler can form hydrogen bonds with fibers, the filler and thefibers can be connected through the alkyl chitosan, and therefore, the strength of raw paper can be effectively improved while the shrinkage rate of the raw paper is reduced.

Description

technical field [0001] The invention relates to the technical field of papermaking, in particular to a preparation method of high-white high-strength carbonless copy paper base paper. Background technique [0002] Carbonless copy paper is a kind of colorless copy paper, which has the functions of direct copying and direct color development, and is mainly used for multipart forms, bills, continuous financial notes, etc. Carbonless copy paper is generally made by coating base paper with two coatings: a CF layer containing a chromogenic agent and a CB layer containing a chromogenic agent. The chromogenic agent is a special colorless dye that has been dissolved in non-volatile carrier oil and encapsulated by microcapsules of 3-7 μm. The impact pressure of forceful writing and printing can crush the microcapsules, allowing the colorless dye solution to flow out and contact the color developer, and a chemical reaction occurs to present colored graphics, thereby achieving the purp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/00D21H17/69D21H21/20D21H21/16D21H17/68D21H17/24D21H17/06D21H11/00C09C1/28C09C3/10
CPCD21H27/00D21H17/69D21H21/20D21H21/16D21H17/68D21H17/24D21H17/06D21H11/00C09C1/28C09C3/10
Inventor 贵仁兵费旭勇董金雨任声春张美娟杨奎占
Owner XIANHE CO LTD