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A drying method for avoiding wrinkle deformation after water-based deacidification of paper

A drying method and deacidification technology, applied in waste paper post-processing, physical treatment of paper, printing post-processing, etc., can solve the problems of difficult control of speed, paper wrinkle deformation, uneven moisture distribution, etc., to reduce uneven shrinkage Deformation, moisture content return to normal, evenly distributed effect

Active Publication Date: 2022-05-03
HANGZHOU ZHONGCAI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When using methods such as heating or vacuum drying to assist drying of paper, although the drying and dehydration speed is faster, the shrinkage and deformation of paper fibers are reduced to a certain extent, but due to the uneven distribution of moisture in the paper after deacidification, and these drying The essence of the method is to remove the moisture in the paper by vaporizing and evaporating the water molecules under heat. It is difficult to control the speed of the moisture drying and evaporation process in each area of ​​the paper surface. The moisture in the place is evenly removed, and it is easy to destroy the original paper fiber structure due to uneven dehydration, resulting in wrinkled deformation of the paper

Method used

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  • A drying method for avoiding wrinkle deformation after water-based deacidification of paper
  • A drying method for avoiding wrinkle deformation after water-based deacidification of paper
  • A drying method for avoiding wrinkle deformation after water-based deacidification of paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Place the paper to be deacidified in a deacidified treatment box with a temperature of 50°C and a relative humidity of 90%, select 5wt% calcium hydroxide solution as the deacidified solution, and spray the deacidified solution in the deacidified treatment chamber. The paper is sprayed for 10 minutes. After the treatment is completed, the deacidified paper is placed on the cotton net 10 cm above the grounding plate, and the plate connected to the output end of the high-voltage power supply is 30 cm above the grounding plate. The paper is placed Finally, turn on the high-voltage power supply, adjust the output voltage to 8kV, and start dehydration and drying assisted by a high-voltage electric field. After 60 minutes of treatment, take out the dried paper to complete the non-destructive and uniform deacidification of the paper.

[0034] Performance Testing:

[0035] The method for detecting the deacidification effect of the paper in this embodiment is to divide the paper ...

Embodiment 2

[0054] The deacidification solution in the deacidification treatment process of Example 1 is replaced by 5wt% magnesium bicarbonate aqueous solution, and the rest are the same as the operation steps of Example 1, and the non-destructive drying after the uniform deacidification of the paper can be completed. The values ​​are evenly distributed, the surface morphology is basically the same as that of the base paper, and there is no obvious wrinkle deformation.

Embodiment 3

[0056] The temperature of the deacidification treatment box in Example 1 is adjusted to 55° C., and the relative humidity is 95% in the deacidification treatment box. The rest are the same as the operation steps of Example 1, and the non-destructive drying after the uniform deacidification of the paper can be completed. The pH value is evenly distributed everywhere, and the surface morphology is basically the same as that of the base paper, without obvious wrinkle deformation.

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Abstract

The application provides a drying method for avoiding wrinkling and deformation of paper after water-based deacidification, comprising the following steps: 1) placing the acidified paper in a treatment room with constant temperature and humidity, and using an aqueous deacidification solution to deacidify the acidified paper; 2) The deacidified paper is placed in a high-voltage electric field, and dehydrated and dried under the action of the electric field force. This method uses water-based deacidification liquid to complete the uniform deacidification of paper in the treatment chamber, and at the same time makes the moisture in the paper evenly distributed, and then uses the high-voltage electric field to accumulate and remove the moisture in the paper. The dehydration process will not damage the fibers of the paper. The paper can be deacidified and dried without wrinkling and deformation on the paper surface.

Description

technical field [0001] The present application relates to the field of deacidification and drying of paper, in particular to a drying method for avoiding wrinkling and deformation of paper after aqueous deacidification. Background technique [0002] The moisture content of paper in the normal storage process is 5% to 8%. This part of water includes three forms of existence, free water, capillary water and bound water. Free water refers to the moisture physically adsorbed on the surface of the paper, and its saturated vapor pressure is equal to The saturated vapor pressure of pure water at the same temperature, this part of water is easier to evaporate and remove during the paper drying process. Capillary water refers to the moisture contained in the capillary in the paper. The evaporation of this part of the water is affected by the capillary force, and the saturated vapor pressure is lower than that of pure water at the same temperature. Bound water refers to the moisture ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H25/18D21H25/04B41M7/00
CPCD21H25/18D21H25/04B41M7/0063B41M7/0072
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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