Abstract:

Specimens from Japanese Sugi（Cryptomeria japonica）wood was treated with superheated steam under the temperature of 140,160,180 ℃ and the relative humidity(RH) of 0,60%,100% to investigate the moisture absorption and desorption characteristics and moisture absorption hysteresis phenomenon of treated wood under different environmental temperature and RH. The results showed that the type of the isotherm of the wood treated under high temperature superheated steam was not changed，that under the same environmental humidity, the amount of moisture sorption of the wood under high temperature and RH was lower than that of specimen under low temperature during moisture absorption and desorption process, that the amount of moisture sorption of the wood presented a trend of decreasing with the increasing temperature and RH, and that all specimens showed a hysteresis phenomenon of the moisture absorption, especially for the specimen under high temperature and RH.

Key words: treated under high temperature superheated steam, wood, moisture absorption and desorption characteristics