辊压浸注处理大青杨木材的浸注深度

常温下,对饱水大青杨板材进行压缩率为10%～50%的辊压浸注处理,并对气干(含水率8%～12%)大青杨板材进行空细胞法和满细胞法的真空—加压浸注处理。在14种浸注处理方式和不同辊压次数(1次、3次和5次)条件下测试了试件的径向、弦向和纵向的浸注深度。研究表明,浸注深度随着压缩率的增大而增大,在同一压缩率下,纵向浸注深度最大,径向、弦向浸注深度的差异因压缩方向而异。压缩率为30%所对应的浸注深度与满细胞法(前真空10min,真空度0.095MPa,加压20min,压力0.2MPa)和空细胞法(加压20min,压力0.6MPa)的结果相当;50%的压缩率所对应的浸注深度与满细胞法(前真空10min,真空度0.095MPa,加压20min,压力0.6MPa)的处理结果相近。同一压缩率下,随着辊压次数的增加,试材径向、弦向和纵向的浸注深度增大,径、弦向的浸注深度随着辊压次数的增加而接近。

Impregnation Depth of P. ussuriensis Timber by Roller-compression Process

Under room temperature,P.ussuriensis board at water saturated state was compressed transversely by rollers under the compression ratio from 10% to 50% and air-dry timber was treated by empty-cell and full-cell process.The impregnation depths in radial,tangential and longitudinal directions were tested by fourteen kinds of treatment processes under different compression times.Results show that the impregnation depth increases with the rise of the compression rate,and impregnation depth in longitudinal direction is the most and that in radial and tangential directions differs because of compression direction.The impregnation depth under the compression ratio of 30% is close to that by full-cell process(initial vacuum 10 minutes,vacuum degree 0.095 MPa,pressing time 20 minutes,pressure 0.2 MPa)and by empty-cell process(pressing time 20 minutes,pressure 0.6 MPa),and the impregnation depth under the compression ratio of 50% is close to that by full-cell process(initial vacuum 10 minutes,vacuum degree 0.095 MPa,pressing time 20 minutes,pressure 0.6 MPa).The impregnation depths of sample timber in three directions increase with compression time increasing under the same compression ratio,and the impregnation depth in radial gradually approaches to that in tangential with compression time increasing.