预热处理对改善尾巨桉木材干缩性和材色的研究  

Effects of Pre-heat Treatment on Improving the Shrinkage and Color of Eucalyptus grandis×E.urophylla Wood

作　　者：刘宏达[1] 高建民[1] 陈瑶[1] 

机构地区：[1]北京林业大学材料科学与技术学院,北京100083

出　　处：《西北林学院学报》2014年第5期176-180,206,共6页Journal of Northwest Forestry University

基　　金：国家自然科学基金项目"木材热诱发变色过程中发色体系形成的化学机理"(31070490)

摘　　要：为探讨预热处理对尾巨桉木材干缩性和材色的影响,分别在100℃饱和蒸汽和120℃过热蒸汽条件下对尾巨桉木材进行预热处理。对预热处理前后的尾巨桉木材进行干缩率及色度指数的测定,应用扫描电镜对预热处理后尾巨桉木材的微观构造进行分析。结果表明:1)100℃饱和蒸汽可以使尾巨桉的干缩性降低,材色无明显变化;120℃过热蒸汽处理使尾巨桉在干燥过程中出现较多缺陷,如皱缩、内裂等,但可以有效促使桉木颜色向珍贵树种颜色转变。2)经120℃过热蒸汽处理,尾巨桉木材导管中纹孔的内含物被部分排出,细胞被压扁,宏观尺寸发生变形,是导致尾巨桉出现干燥缺陷的主要原因。To investigate the effects of pre-heat treatment on the shrinkage properties and discoloration of Eucalyptus grandis×E.urophylla wood,the wood samples were pre-heated at 100 ℃saturated steam and 120℃ overheated steam,respectively.The shrinkage ratio and color of the samples after pre-heat treatment were evaluated.The microscopic structure of the samples were analyzed using SEM.The results showed that：1）the shrinkage ratio of Eucalyptus wood samples decreased after 100℃ saturated steam heat treatment,while no obvious discoloration was observed.However,excessive defects appeared during the wood drying process when the samples were subjected to pre-heat treatment under 120℃ overheated steam.Positive color changes could be observed after the wood samples pre-heated under 120℃ overheat steam.2）Parts of the extractives of Eucalyptus were removed by pre-heat treatment,which led to discoloration of the wood samples.The cells were crushed,which resulted in the macroscopic dimension deformation and wood defects during the drying process.

关 键 词：预热处理 桉木 干缩率 颜色 材性改良 

分 类 号：S782.31[农业科学—木材科学与技术]