| summary(En) : | In a previous paper, it was found that the carbonization (heat treatment at 400°C) of HINOKI wood had an influence on its sorptive capacity and that, by its treatment, lignin and crystalline region rapidly degraded within 2 - 3 hr. In this paper, in order to find some factors of sorption hysteresis, the relation between mechanical energy loss (tanδ) and hysteresis ratio of HINOKI sapwood (Chameacyparis obtusa ENDL.) was discussed.
The change of hysteresis ratio with carbonization had a contrary tendency to the change of moisture content in adsorption process that showed a minimum value at about 20% weight loss. And the tendency of hysteresis ratio change was similar to that of mechanical energy loss change calculated from the vibrating reed method and from stress-strain hysteresis.
In terms of energy loss, it would seem that sorption hysteresis and mechanical energy loss in anisotropic substance are the same phenomenon. Therefore, it could be said that structual properties of wood substance, especially its Theological behavior, is a cause of sorption hysteresis. |
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