〔報告〕 真空凍結乾燥における乾湿繰り返しと 乾燥温度による紙資料状態の変化について
Year: 2023
Type: article
Abstract: The present study examined the change in the state of paper materials by vacuum freeze drying in order to restore paper damaged by flooding. Assuming that it is unavoidable for those involved in conservation and restoration to repeat immersing paper materials in water at a disaster site, the state of paper materials is changed due to differences in drying methods. Vacuum freeze drying caused a greater change in the weight, tensile strength, and surface state of the paper than air drying. In particular, the vacuum freeze drying is characterized by a sudden change in the state of the paper in the first drying treatment and by a gradual change with each repeated treatment in the air drying treatment. Vacuum freeze drying was found to be a major cause of changes in other properties, with a decrease in inter-fiber bonding. Therefore, unless it is unavoidable, a continuous use of vacuum freeze drying for the same paper material should be avoided. Changes in the state of the paper material due to differences in the temperatures during the drying process of vacuum freeze drying were investigated (-30℃〜20℃). The changes in the weight, tensile strength, specific scattering coefficient, color and pH due to the difference in the drying temperatures were very small, and the effect of the difference in the drying temperatures on the paper material was small. In the future, more basic information should be collected and organized, and conditions and improvement methods for more effective treatment of materials should be considered.
DOI: 10.18953/0002000303
Language: Japanese
Subfield: Conservation
Field: Arts and Humanities
Domain: Social Sciences
Open Access status: green
OpenAlex ID: W7207724698