预冻方式对脱酸图书冻干效果的影响研究
Effects of Different Pre-freezing Methods on the Drying Quality of Books Processed by Aquatic Deacidification

本文以水溶液脱酸后的整本图书为对象，选取真空冷冻干燥法对脱酸后的整本图书进行干燥实验，研究了预冻方式对图书冷冻干燥过程和干燥品质的影响，分别采用液氮预冻和慢速预冻两种预冻方式对图书进行真空冷冻干燥，并比较分析了图书干燥过程和干燥后纸张白度、色差、抗张强度、撕裂度、耐折度及外观等指标。结果表明，慢速预冻可以减短图书冷冻干燥所需要的干燥时间，提高干燥效率；在图书纸张机械性能保持方面，慢速预冻效果更佳；在图书光学性能和外观保持方面，液氮预冻效果更优；从经济性及图书的长久保存方面考虑，推荐采用慢速预冻。
In this paper, vacuum freezing drying was selected as the research of whole books processed by deacidification. Liquid nitrogen pre-freezing and slow-rate pre-freezing were compared in terms of brightness, color, tensile strength, tearing strength, folding strength and sensory evaluation of books. The results showed that slow-rate freezing shortened drying time. Liquid nitrogen freezing was better than slow-rate freezing in terms of optical quality and appearance, while slow-rate freezing was better in terms of mechanical quality. Considering economical efficiency and long-term conservation of books, slow-rate pre-freezing is recommended