低温冷冻技术对纸张性能的影响

Effect of Low Temperature Freezing on Paper Properties

关键词:  低温冷冻  纸张  白度  机械性能  水抽提液pH值

Key Words:low temperature freezing  paper  brightness  mechanical properties  pH of aqueous extracts

摘要:目前图书馆、档案馆多选用低温冷冻技术杀灭害虫。为研究该技术对纸张的影响，选择6种纸样（道林纸、字典纸、双胶纸、打字纸、新闻纸和试卷纸）进行180个周期的低温冷冻处理，测定其与室温下避光保存纸样的机械性能和水抽提液pH值等性能指标的相对变化。结果显示，各项性能指标相对变化率基本都不超过5%，只有打字纸冷冻后抗张指数相对变化率达到8.6%。因此多次低温冷冻基本不会对纸张性能造成影响，还有利于缓解漂白程度较高的纸张保存过程中白度和抗张强度的下降程度，适宜用于图书档案的杀虫操作。

Abstract:At present, the low temperature freezing technology is used for pest control in libraries and archives. In order to study the influence of the technology on paper properties, six kinds of paper samples(woodfree paper, bible paper, offset paper, manifold paper, newspaper and examination paper)were selected for 180 cycles of low temperature freezing treatment,meanwhile the same samples were preserved at room temperature in dark place. Then the paper properties were measured. The results showed that the relative change rate of various properties basically did not exceed 5%. Only the relative change rate of the manifold paper’s tensile rate reached 8.6%. Therefore, the low temperature freezing technology did not substantially affect the paper properties, and it would also help to alleviate the decline of whiteness and tensile property during the preservation of the paper with high bleaching degree. It was suitable for the insecticidal operation of books and archives.