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Method for deacidifying whole volume of paper

A deacidification method and paper technology, applied in waste paper post-treatment, gaseous chemical plating, coating, etc., can solve the problems of paper acid return, deacidification agent volatile storage, transportation, etc., to solve the problem of adhesion, reduce Replacement frequency and cleaning difficulty, and the effect of improving production efficiency

Active Publication Date: 2021-12-31
HANGZHOU ZHONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned defects of the prior art, the technical problems solved by the present invention are: (1) improve the uniformity and deacidification efficiency of the whole volume of paper, complete the homogenization of paper, and avoid the situation of paper acid return after deacidification ; (2) The deacidification agent in the slow-release film is volatile, which leads to the problem of excessive storage, transportation, and interlining requirements; (3) Improve the stability of the deacidification effect and production efficiency

Method used

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  • Method for deacidifying whole volume of paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Book "Science and Outlook on Life", 89 pages in total, machine-made paper, basis weight 50g / m 2 , A5 size, original pH=5.5, lined with slow-release membrane at 0.4kg / cm 2 After 10 minutes of static pressure, direct current is applied, the forward energization time is 4 minutes, the reverse energization time is 4 minutes, the voltage is 20V, and the deacidification time is 16 minutes; the temperature of the precision constant temperature and humidity box is 50 ° C, the humidity is 90%, and the homogenization time is 120 minutes; After the acid is finished, the average pH is 9.3, and the paper has no wrinkles and no fading.

[0053] The sustained-release film is prepared by absorbing a calcium-based water-based deacidification agent on absorbent paper with a thickness of 0.2 mm; the adsorption capacity of the absorbent paper is twice its own weight.

[0054] The electrode plate adopts graphite inert electrode plate.

Embodiment 2

[0056] Book "Chunqiu Zuo Shi Zhuan", a total of 36 pages, handmade paper, weight 20g / m 2 , A4 size, original pH=4.3, lined with slow-release membrane at 0.4kg / cm 2 Apply cosine alternating current after 30 min of static pressure, voltage size 20V, alternating current frequency 30 Hz, deacidification time 25 min; precision constant temperature and humidity box temperature 45 ℃, humidity 90% homogenization time 60 min; average pH after deacidification is 8.5, Paper is wrinkle-free and does not appear to fade.

[0057] The sustained-release film is prepared by absorbing a calcium-based water-based deacidification agent on absorbent paper with a thickness of 0.2 mm; the adsorption capacity of the absorbent paper is twice its own weight.

[0058] The electrode plate adopts graphite inert electrode plate.

Embodiment 3

[0060] Book "Mathematics and Physics Equations and Special Functions", a total of 83 pages, machine-made paper, weight 56g / m 2 , A5 size, original pH=3.9, lined with slow-release membrane at 0.4kg / cm 2 After 40 minutes of static pressure, apply a square wave AC voltage of 36V, AC frequency 30Hz, deacidification time 24min; precision constant temperature and humidity box temperature 55 ℃, humidity 90%, homogenization time 90min; after deacidification, the average pH is 8.4, the paper has no wrinkles and no fading.

[0061] The sustained-release film is prepared by absorbing a calcium-based water-based deacidification agent on absorbent paper with a thickness of 0.2 mm; the adsorption capacity of the absorbent paper is twice its own weight.

[0062] The electrode plate adopts graphite inert electrode plate.

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Abstract

The invention discloses a method for deacidifying a whole volume of paper. The method is used for deacidifying a whole book in three steps of prepressing, rapid deacidifying and homogenizing. On the basis of a static pressure whole volume deacidification method, a homogenization process is added, so that the deacidification effect stability is improved; and the high-voltage alternating current is used on the basis of the existing low-voltage direct current adsorption technology, so that the deacidification efficiency of the whole book is effectively improved, and meanwhile, the problem of non-uniform deacidification of the book caused by enrichment of anions and cations on a certain electrode is avoided. The deacidification operation is convenient, the deacidification process is environment-friendly, and accurate deacidification can be realized.

Description

technical field [0001] The invention relates to the technical field of paper protection, in particular to a method for deacidifying a whole volume of paper. Background technique [0002] As the most common carrier of human wisdom, books have played a vital role in preserving science and technology; in people's social life, books are still the most important means of disseminating and learning knowledge. There are tens of thousands of massive documents collected in libraries, archives, and individual homes, and most of these books are paper documents. With the passage of time, books are stored in different conditions, and books will gradually age and wear out, affecting their normal use. The aging of books is often accompanied by yellowing and brittle paper. The main reason is that the paper is gradually acidified under long-term use or improper storage. Therefore, in order to prolong the service life of books, it is often necessary to deacidify the paper to prevent further...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H25/18B41M7/00C23C16/26
CPCD21H25/18B41M7/0063C23C16/26
Inventor 施文正陈炳铨徐绍艳徐春辉张溪文唐晓敏
Owner HANGZHOU ZHONGCAI TECH CO LTD
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