三种水热处理方法对奥古曼软化效果的影响

采用水煮法、100℃蒸汽处理法和覆膜加热法对奥古曼进行软化处理,探讨不同处理条件对其不同方向屈服强度的影响,并观测处理前后试件的含水量变化。结果表明覆膜加热法下的奥古曼试件的屈服强度虽有所降低,但远高于水煮法和100℃蒸汽处理法处理的试件,试件的水分含量随处理温度的升高及处理时间的延长而降低;水煮法奥古曼试件的屈服强度随处理温度的升高及处理时间的延长而降低,试件的水分含量随处理温度的升高及处理时间的延长而提高;100℃蒸汽处理法奥古曼试件的屈服强度也随处理时间的延长而降低,略高于水煮法处理试件,但相差不大,试件的水分含量随处理时间的延长而提高,但提高幅度明显小于水煮处理试件,因而优选100℃蒸汽处理法作为奥古曼压缩密实前的软化处理方法。3种方法处理前后奥古曼径向屈服强度均明显高于弦向和45°方向,可见奥古曼弦向和45°方向较径向更容易被压缩。

Drying Characteristics and Drying Schedule Establishment of Eucalyptus pellita Wood

By adopting the 100℃drying test method,the drying characteristics and drying schedule of the pre-frozen and unfrozen Eucalyptus pellita wood were studied.The results show that the pre-freezing treatment reduced the initial crack, inner crack and cross section deformation of wood, and the drying quality for the frozen wood was superior to that for the control.