Effects of High Temperature Heat Treatment at 185℃ on Physical Properties of Ash Wood
The effects of high temperature heat treatment at 185℃ in commercial scale on the physical properties (density,hygroscopicity,and dimensional stability) of ash wood (Fraxinus mandshurica) were determined and analyzed in this paper.The results showed that:the oven-dry and air-dry densities of heat treated ash wood was slightly less than that of the reference ; the hygroscopicities of heat treated ash wood were obviously lower than the reference,meanwhile,the difference of EMC between heat treated and reference of ash wood increased with relative humidity; when the specimens were in equilibrium at two environments with temperature 60℃,relative humidity 40 ％ (dry condition),80 ％ (moist condition) respectively,swelling ratio in tangential and radial direction of heat treated ash wood were declined at different level,the ASE (anti-shrink efficiency) reached 55.53 ％ and 47.34 ％ in the above two environments,the dimensional stability of heat treated ash wood was improved remarkably.
high temperature heat treatmentash wood (Fraxinus mandshurica)solid wood blankdensityhygroscopicitydimensional stability
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NSTL
万方数据
维普
