高温水蒸气处理固定大青杨木材横纹压缩变形的研究

STUDY ON THE FIXATION COMPRESSIVE DEFORMATION OF POPULUS USSURIENSIS IN THE TRANSVERSE DIRECTION BY HIGH TEMPERATURE STEAM TREATMENT

采用高温水蒸气处理和加热处理固定大青杨木材压缩变形 ,并对两种处理结果进行比较。测定了木材的抗胀 (缩 )率 (ASE)、阻湿率 (MEE)、质量损失率 (WL)、压缩率、压缩变形恢复率等各项指标。结果表明 :无论是高温加热处理还是高温水蒸气处理 ,木材的尺寸稳定性明显得到提高。在相同温度条件下 ,当ASE的值超过 5 0 %时 ,高温水蒸气处理所需要的时间远远小于高温加热处理所需要的时间 ,当温度为 1 80℃时加热处理需要 1 5～ 2 0h ,而水蒸气处理仅需要 8min ,压缩变形被固定。

The wood of poplar is compressed,then the compression deformation is fixed by high temperature steam and heating.This paper discuss on the role of fixation wood compression deformation in the transverse direction.It is measured for the index of anti\|swelling efficiency( ASE ),moisture excluding efficiency( MEE ),weight loss( WL ),compression set and recovery set of compressive deformation and so on.The result show that the dimensional stability can be improved apparently by either high temperature steam or heating.At the same temperature condition,when the value of ASE go beyond the scope 50%,the time of high temperature steam treatment is short clearly compared with heated.Compressive deformation of poplar timber is nearly fixed completely while the temperature is 180℃,which heating treatment need to 15～20 hours,but steam treatment only need to 8 minutes.