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Effect of Ambient Relative Humidity on Damage Risk of Paper
Received:September 23, 2024  
DOI：10.11980/j.issn.0254-508X.2025.03.017
Key Words:ambient relative humidity  paper  damage risk  folding  tearing
Fund Project:国家图书馆科研项目“可持续书库建设研究——基于气候和书库特点定制书库环境温湿度期望值的方法研究”（NLC-KY-2022-22）。
Author NameAffiliationPostcode
YAN Zhipei* Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
TIAN Zhouling Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
REN Shanshan Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
YI Xiaohui Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
ZHANG Ming Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
LONG Kun Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
ZHANG Nan Key Lab of Ancient Book Preservation and Conservation， Ministry of Culture and Tourism，National Library of China， Beijing， 100034 100034
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Abstract:In this study， the effect of ambient relative humidity on the mechanical strength of paper were investigated by measuring the tensile index， folding resistance， and tearing index. Then， the mechanical strength reduction method and the mechanical strength and cellulase polymerization （DP） correlation method were used to evaluate the influence of the ambient relative humidity on the damage risk of paper. The results showed that the tearing index of paper decreased when the ambient humidity was lower（15%）. When the ambient humidity was higher（85%）， the tensile index of paper decreased. When the ambient relative humidity was lower or higher， the folding resistance of some papers decreased. According to the mechanical strength reduction method and the correlation method of mechanical strength and DP， the tearing index of type paper and aged type paper was small， and the tearing index further decreased when the ambient relative humidity was lower， so the tearing risk increased. Although the tearing index of aged bible paper and aged newsprint decreased by more than 20% when the ambient relative humidity was lower， the tearing index was still large， so the tearing risk would not be significantly increased. The tearing index of other paper decreased less when the ambient relative humidity was lower， and the tearing risk did not increased significantly. When the ambient relative humidity was lower or higher， only the reduction of folding resistance of aged glazed printing was greater than 20%， but it still didn’t reach the threshold of significantly affecting the folding risk， and the breaking risk will not be significantly increased. When the ambient relative humidity was higher， the risk of tensile failure of all paper was increased. Therefore， lower ambient relative humidity had no significant effect on the risk of damage of paper with good mechanical strength and may increase the risk of tearing or breaking of paper with poor mechanical strength， while higher ambient relative humidity increased the risk of tensile failure of all paper.
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