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A fading repair method suitable for paper yellowing after deacidification

A repair method and paper technology, which can be used in the post-processing of waste paper, and can solve problems such as yellowing

Active Publication Date: 2022-05-27
HANGZHOU ZHONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to address the technical problem that paper often causes yellowing in some areas of the paper after deacidification treatment, and to provide a method for repairing the yellowing of paper after deacidification

Method used

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  • A fading repair method suitable for paper yellowing after deacidification
  • A fading repair method suitable for paper yellowing after deacidification
  • A fading repair method suitable for paper yellowing after deacidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select the machine-made paper with yellowing after 24 hours of deacidification. First, use a weak acid solution to remove the excess deacidification agent remaining on the surface of the paper. The weak acid solution is a mixed solution of carbonic acid with a pH value of 6.2 to 6.3 and 0.02mol / L sodium bicarbonate. , that is, carbon dioxide gas was continuously introduced into the 0.02 mol / L sodium bicarbonate solution until the pH value of the solution was 6.2-6.3. After ultrasonic atomization of the prepared weakly acidic solution, it was uniformly applied to the surface of the yellowed paper. The atomization reaction time was 5 minutes. After atomization, the machine-made paper was naturally dried and placed in a plasma treatment chamber. Dielectric barrier discharge, the discharge gas is a mixture of 5% hydrogen and 95% argon, the voltage is adjusted to 65V, and the current is 0.2A. When a stable discharge arc is generated in the plasma treatment chamber, start timi...

Embodiment 2

[0049] Select the same machine-made paper with yellowing after deacidification as in Example 1, and adjust the weakly acidic solution in the treatment process of Example 1 to a mixed solution of carbonic acid and 0.005mol / L calcium bicarbonate, and the pH value of the solution is adjusted to 6.2 to 6.3, the rest are the same as the operation steps of Example 1.

[0050] Performance Testing:

[0051] Take the machine-made paper before deacidification in Example 2, and measure the chromaticity value, and then take the machine-made paper 30 days after fading and repair, and measure the chromaticity value. The test results are shown in Table 5. The color difference between the paper after fading repair and the original paper meets the repair standard.

[0052] Table 5 The chromaticity value and its color difference between the original paper and the original paper after 30 days of fading repair

[0053]

Embodiment 3

[0055] Select the same machine-made paper with yellowing after deacidification 24h as in Example 1, adjust the hydrogen content in the hydrogen and argon gas mixture in the treatment process of Example 1 to 8%, and the rest are the same as the operation steps of Example 1 .

[0056] Performance Testing:

[0057] Take the machine-made paper before deacidification in Example 3, and measure the chromaticity value, and then take the machine-made paper 30 days after fading and repair, and measure the chromaticity value. The test results are shown in Table 6. The color difference between the paper after fading repair and the original paper meets the repair standard.

[0058] Table 6 The chromaticity value and its color difference between the original paper and the original paper after 30 days of fading repair

[0059]

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PUM

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Abstract

The application provides a method for repairing discoloration of paper yellowing after deacidification, which includes the following steps: 1) spray the weakly acidic solution evenly on the yellowing area of ​​the paper surface after deacidification, and neutralize the excess deacidification. An acid agent; the pH value of the weakly acidic solution is 6.0-6.5; 2) After the paper is naturally dried, the surface of the paper is treated with reducing plasma. This method can remove excess deacidification agent on the surface of paper without affecting the deacidification effect of paper, prevent severe yellowing of paper after deacidification, and repair the yellowing area of ​​paper after deacidification, so that the paper The surface returns to the state before deacidification.

Description

technical field [0001] The present application relates to the technical field of paper yellowing repair, in particular to a fading repair method suitable for paper yellowing after deacidification. Background technique [0002] The main components of paper are cellulose, hemicellulose and lignin. Under normal circumstances, cellulose and hemicellulose do not contain chromophores and do not absorb visible light; lignin contains chromophores and auxiliary chromophores. It has a certain ability to absorb visible light, so the presence of lignin makes the paper appear yellow or brown without bleaching. In order to obtain paper with high whiteness, it is usually necessary to perform bleaching treatment during the papermaking process. The mechanically pulped paper destroys the chromophoric groups in the lignin through the oxidative properties of the added bleaching agent, and oxidizes the lignin and hydrolyzes it into colorless. the alkylphenol state. Chemical pulping, on the oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H25/18
CPCD21H25/18
Inventor 张溪文陈炳铨施文正徐春辉徐绍艳唐晓敏
Owner HANGZHOU ZHONGCAI TECH CO LTD
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