用低材质原木制作模压矩形材的研究  

Rectangle timber molding by low quality log.

作　　者：刘一星[1] 赵钟声[1] 张玉[1] 沈隽[1] 

机构地区：[1]东北林业大学材料科学与工程学院

出　　处：《北京林业大学学报》2004年第6期86-89,共4页Journal of Beijing Forestry University

基　　金：国家自然科学基金项目(39970595);教育部重点课题(01067)共同资助

摘　　要：以低材质原木为原料,对制作难度很大的非正方形截面模压矩形材的制作工艺进行了试验研究.结果表明杨木、落叶松、冷杉等实体木材的压缩恢复率均随水蒸气处理(180℃)定型时间的增加而减小;模压矩形材沿其短轴方向由表面至中心密度递减,沿长轴方向表面的中部密度最大;应用改进设计的模具,沿模压的短轴和长轴方向同时施力可克服模压矩形材的环状开裂;压缩矩形材的密度分布有利于提高整体压缩材的力学强度和物理性能.同时,该文对压缩矩形材的生产工艺及影响矩形材变形固定的主要因素进行了考察.Rectangle timber molding by low quality log was carried out. The results show that the compression recovery increase of poplar, larch and fir declines with steam treating time. The density decreases from surface to core in short axis direction of rectangle timber, while the highest is in the surface center of the long axis. Through molder design modification, the ring check is overcome as compressing from two axes at the same time. Well density distribution will increase the strength and mechanical properties. Processing technique and principal factors, which influence the strain fixing of rectangle timber molding, are also concerned.

关 键 词：模压矩形材 水蒸气处理 压缩变形固定 

分 类 号：S781.2[农业科学—木材科学与技术]