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Fading repair method suitable for yellowing of deacidified paper

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: 2021-08-03
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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  • Fading repair method suitable for yellowing of deacidified paper
  • Fading repair method suitable for yellowing of deacidified paper
  • Fading repair method suitable for yellowing of deacidified paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Select the machine-made paper that turns yellow 24 hours after deacidification, first remove the excess deacidification agent remaining on the surface of the paper with a weak acidic solution, choose a mixed solution of carbonic acid with a pH of 6.2 to 6.3 and 0.02mol / L sodium bicarbonate for the weak acidic solution , that is, continue to feed carbon dioxide gas into the 0.02mol / L sodium bicarbonate solution until the pH value of the solution is 6.2-6.3. After the prepared weak acidic solution is ultrasonically atomized, it is evenly applied to the surface of the yellowing paper. The atomization reaction time is 5 minutes. 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 processing chamber, start timing and the yellowing The paper was taken out after being treated in the plasma treatment chamber for 60s, and the subs...

Embodiment 2

[0049] Select the machine-made paper that yellowing occurs in 24h after the same depickling as in Example 1, and the weakly acidic solution is adjusted to a mixed solution of carbonic acid and 0.005mol / L calcium bicarbonate in the process of Example 1, and the pH value of the solution is adjusted to 6.2 to 6.3, and the rest are the same as those in 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 the fading and repairing, and carry out the measurement of the chromaticity value. The test method is the same as in Example 1. The test results are shown in Table 5. The color difference between the faded and repaired paper and the original paper meets the repair standard.

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

[0053]

Embodiment 3

[0055] Select the same machine-made paper that turns yellow 24h after deacidification as in Example 1, adjust the hydrogen content in the hydrogen and argon mixture in the process of Example 1 to 8%, and the rest are the same as in Example 1. .

[0056] Performance Testing:

[0057] Take the machine-made paper before deacidification in Example 3, and carry out the measurement of chromaticity value, then take the machine-made paper 30 days after its fading and repairing, and carry out the measurement of chromaticity value, and the test method is the same as that of Example 1. The test results are shown in Table 6. The color difference between the faded and repaired paper and the original paper meets the repair standard.

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

[0059]

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Abstract

The invention provides a fading repair method suitable for yellowing of deacidified paper, which comprises the following steps of 1) atomizing a weak acid solution, uniformly spraying the atomized weak acid solution on a yellowing area on the surface of the deacidified paper, and neutralizing an excessive deacidification agent, and enabling the pH value of the weak acid solution to be 6.0-6.5, and 2) after the paper is naturally dried, treating the surface of the paper by using reductive plasma. According to the method, the excessive deacidification agent on the surface of the paper can be removed under the condition that the deacidification effect of the paper is not influenced, the paper is prevented from seriously yellowing after deacidification, and the yellowing area of the paper after deacidification is subjected to color fading repair, so that the surface of the paper is recovered to the state before deacidification.

Description

technical field [0001] The present application relates to the technical field of paper yellowing restoration, in particular to a fading restoration 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 will not absorb visible light; lignin contains chromophores and auxochromes. It has a certain ability to absorb visible light, so the presence of lignin makes the paper yellow or brown when it is not bleached. In order to obtain paper with high whiteness, it is usually necessary to carry out bleaching treatment in the papermaking process. The paper made by mechanical method destroys the chromophoric group in lignin by adding the oxidation of bleaching agent, oxidizes lignin, and hydrolyzes it into colorless of the alkylphenol state. Chemical pulping, on the other hand, bleaches the pap...

Claims

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Application Information

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Patent Type & Authority Applications(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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