EFFECTS OF SATURATED VAPOR PRE-STEAMING ON DRYING STRAIN IN ASIAN WHITE BIRCH: EXPERIMENTATION AND MODELLING

Zongying Fu, Stavros Avramidis, Jingyao Zhao, Yingchun Cai, Yongdong Zhou

Abstract


The effect of low pressure saturated vapor pre-steaming on restrained shrinkage strain, mechanosorptive creep and the distribution of moisture content was investigated during conventional drying of wood discs. Mechano-sorptive creep was furthermore modelled by artificial neural network theory with five inputs, i.e., pre-steaming and drying temperatures, wood moisture content, relative humidity and distance from the pith. Results revealed that, pre-steaming partly reduced the variation of moisture content distribution along radial direction, increased restrained shrinkage strain in heartwood and
decreased in sapwood and slightly decreased the mechano-sorptive creep. The neural network model provided reasonable prediction results, namely, the coefficient of determination for training, validation and test sets greater than 0,95.

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