干燥过程中超低密度植物纤维材料的尺寸稳定性

因具有“桁架”网状结构的超低密度植物纤维材料在干燥过程中外形尺寸会产生改变，该文研究了干燥温度和应用模具对尺寸稳定性的影响。结果表明:干燥温度低于100℃时，尺寸收缩率与温度之间呈正相关，最大收缩率可超过5％；干燥温度超过100℃时，材料内部出现分层现象。材料置于模具中进行干燥可以消除水平方向的收缩，但高度方向的收缩率大于无模具干燥下的收缩率。 

Dimensional stability of ultra-low-density plant fiber materials during drying process

Ultra-low density plant fiber material has a reticular structure with density ranging from 0.01 to 0.09 g/cm3. The size and shape of materials can alter during drying process. The effects of drying temperature and mould on dimensional stability were measured. The results indicated that a positive correlation between drying temperature and size shrinkage was found when drying temperature was below 100℃ and a maximum shrinkage was over 5%. When drying temperature increased over 100℃，internal splits could be observed. Drying the materials in a restricting mold diminished the horizontal shrinkage，and the vertical shrinkage was higher than that in the mold less drying.