辊压处理对大青杨木材干燥性能的影响

Studies on Effect of Roller Compression on Poplar Wood Drying Properties

以大青杨(Populus ussuriensis Kom.)为试材,径向和弦向为施力方向,进行压缩率为10%、20%、30%、40%和50%的辊压处理,以时间为变量、含水率为函数研究在100℃条件下辊压处理对木材干燥性能和构造特征的影响。结果表明:未见木材表面损坏,宏观特征与素材无明显差异;微观特征发生改变,导管分子的纹孔、纹孔膜发生损坏和破裂,导管、木纤维细胞壁出现折痕和微观裂隙,变异特征随着压缩率的增大而加剧。辊压处理试材达到同一含水率的时间均少于素材,随着压缩率的增加,干燥时间减少,当含水率降到30%时,干燥时间可缩短5.05%~19.64%;当含水率降到10%时,可缩短2.57%~23.92%。辊压处理试材含水率下降速度随着压缩率的增加而增大,与素材相比,提高了6.89%~47.39%。

This study was carried out to investigate the effect of compressive ratio of 10%, 20%, 30%, 40% and 50% on drying performance and structural characteristics of Poplar(Populus ussuriensis Kom.) in tangential and radial direction at 100℃, when subjected to compression treatment with time as a variable and moisture content as a function. The results showed that: There were no wood surface damage and no significant difference compare to control specimens;Microscopic characteristics were changed and pit and pit membrane of vessel molecular were both damaged and ruptured;Creases and microscopic fissures appeared in vessel and wood fiber cell wall and the variation characteristics increased as the compression ratio increased;The time for the compression specimen to reach the same moisture content was less than the control;The drying time became less as the compression ratio increased when the moisture content dropped to 30%, the drying time could be saved by 5.05% to 19.64%;When the moisture content dropped to 10%, the drying time could be saved by 2.57%~23.92%;The decrease rate of moisture content of the test material increased with the increase of compression rate, which was 6.89%~47.39% higher than that of the material.