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当木材干燥将要结束时,表面与内部具有水分梯度。内部产生张应力,外部产生压应力。如不及早消除,木材纤维将会受到破坏,产生开裂缺陷。消除应力的一般方法是实行终了处理。为了节约能源,将高温度差工艺改为关闭加热器和进排气道、打开喷蒸管的无温度差终了处理。处理后,在干燥炉或冷却间放置2～3天,对落叶松板材裂纹的愈合及减少变形有好处。试验表明:采用无温差处理,不仅可以提高
When the wood drying is about to end, the surface and the interior has a water gradient. Internal tensile stress, external stress. If not eliminated soon, the wood fiber will be damaged, resulting in cracking defects. The general method of stress relief is to put an end to treatment. In order to save energy, the process of high temperature difference to turn off the heater and the intake and exhaust, open the no-temperature difference between the end of the steam treatment. After treatment, placed in a drying oven or cooling between 2 to 3 days, the larch sheet crack healing and reduce deformation is beneficial. Tests show that: no temperature difference, not only can be improved