3种预处理方法改善杨木渗透性的对比研究

渗透性反映流体通过木材的难易程度,是木材的重要物理特性之一,提高渗透性可以提高木材的干燥速度以及木材改性时流体的浸注效果。作者对杨木板材进行汽蒸、水煮及爆破处理来研究提高杨木板材的渗透性的因素。试验表明,这3种方法均能不同程度地提高杨木板材的渗透性,温度相同,汽蒸、水煮预处理时间越长,渗透性越大;时间相同,预处理温度高的渗透性好于温度低的渗透性。爆破预处理温度相同条件下,压力高的渗透性好于压力低的渗透性;相同爆破压力时,同样也是温度高的渗透性好于温度低的渗透性。

Effects of three pretreatment methods on improving the permeability of Poplar wood

Permeability reflects difficulty level of fluids moving through wood,which is one of the most im-portant physical properties of wood,and the increase of permeability can also raise drying rate and impregnating treatment effects during wood modification.For improving permeability of Poplar wood,the steaming,hot water and explosion pretreatment methods were used,and the test results showed these three methods significantly im-proved the permeability of Poplar wood.The permeability increased with time extension at the same temperature after streaming and boiling treatment;in the same period of time,permeability under high-temperature treatment was better than that of low temperature.At the same explosion temperature,the permeability under high-pressure treatment was better than that of low pressure,and the permeability under high-temperature treatment was better than that of low temperature at the same pressure.