上海元代水闸遗址出土木构件无损冻干初探

Preliminary study of non-destructive freeze drying for the wooden structural components unearthed at the Yuan Dynasty Sluice Site in Shanghai

传统的冷冻脱水过程通常需要将电阻温度传感器(RTD)插入到物料中以监测温度变化从而确定干燥终点,这种方式对于处理木质文物来说具有一定的破坏性,无法做到无损或微损。本研究尝试采用无损方式对定型加固剂浸渍液即时浓度进行分析,并对冷冻干燥终点进行预测。采用这种无损技术成功地对志丹苑元代水闸遗址出土的30件木构件进行真空冷冻脱水定型处理,既达到了预期的定型保护效果,又确保了木构件的安全。

The traditional freeze-drying process usually requires the insertion of a resistance temperature sensor (RTD) into the material to monitor the temperature variation and determine when drying has been achieved.However,this technique often causes damage to wooden relics in terms of conservation.In this study,we analyzed the real-time concentration of the dimensional stabilizer agent impregnation solution and were able to predict the end point of freeze drying in a nondestructive way.Using this method,we conserved 30 fragments of wooden structural components excavated at the Zhidanyuan Sluice Site of the Yuan Dynasty by vacuum freeze drying,achieving the desired effect of shape protection and ensuring the safety of these wooden components as well.