单板疏解程度对桉木重组木性能的影响  

Effects of Crushing Degrees of Veneer on Properties of Eucalypt Scrimber

作　　者：禤示青 陈桂丹[1] 陈松武 陈安阳 刘晓玲[1] 李东飞 Xuan Shiqing;Chen Guidan;Chen Songwu;Chen Anyang;Liu Xiaoling;Li Dongfei(Guangxi Forestry Research Institute,Guangxi Wood and Wood-based Panel Processing and Utilization of Scientific and Technological Achievements Transformation Pilot Research Base,Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation,Nanning,Guangxi 530002,China)

机构地区：[1]广西壮族自治区林业科学研究院、广西木材及人造板加工利用科技成果转化中试研究基地、广西优良用材林资源培育重点实验室,广西南宁530002

出　　处：《广西林业科学》2025年第1期78-84,共7页Guangxi Forestry Science

基　　金：广西林业科技推广示范项目(桂林科研[2022]第20号,2023GXLK03);广西林科院研究团队专项(2024RT15)。

摘　　要：桉木重组木为解决小径级桉木材质软、强度低和尺寸稳定性差等问题提供新思路。为给桉木重组木制备工艺优化提供技术参考,探究厚单板疏解程度对桉木重组木性能的影响,以4 mm厚桉木旋切单板为材料,分析疏解次数对单板质量、宽度、厚度和吸水率的影响,并以单板吸水率为单板疏解程度评价指标,选取5种吸水率(50%~90%)疏解单板制备重组木,分析疏解程度对重组木微观形貌和主要性能的影响。结果表明,桉木单板质量损耗率、宽度延展率、厚度变化率和吸水率均与疏解次数呈正相关。随单板疏解程度增加,单板表面裂缝增多,胶黏剂更易进入单板内部,胶合界面扩大。重组木力学性能均随单板疏解程度增加呈上升或波动趋势;单板吸水率为70%时,桉木重组木抗弯性能较好,水平剪切性能最好。重组木吸水厚度膨胀率随单板疏解程度增加整体呈先降后升的趋势,在单板吸水率为70%时最低。采用吸水率为70%疏解单板制备桉木重组木,其性能较佳。Eucalypt scrimber provides new idea for solving problems of softness,low strength and poor dimensional stability of small-diameter eucalypt woods.In order to provide technical references for optimization of preparation process of eucalypt scrimber,and explore effects of crushing degrees of thick veneer on property of eucalypt scrimber,4 mm thick eucalypt rotary veneers were taken as materials,and effects of crushing times on mass,width,thickness and water absorption rate of veneer were analyzed.Taking water absorption rate of veneer as evaluation index of veneer crushing degree,five kinds of crushing veneers with water absorption rates from 50%to 90%were selected to prepare scrimbers,and effects of crushing degrees on micro-structure and main properties of scrimber were analyzed.Results showed that loss rate of material mass,width elongation rate,thickness change rate and water absorption rate of eucalypt veneer had positive correlations with crushing times.With increase of veneer crushing degree,cracks on surface of veneer increased,adhesives were easier to enter interiors of veneer,and bonding interfaces expanded.Mechanical properties of scrimber increased or fluctuated with increase of veneer crushing degree.When water absorption rate of veneer was 70%,bending property of scrimber was better,and horizontal shear property was the best.Thickness swelling rate of scrimber decreased first and then increased with increase of veneer crushing degree,which was the smallest when water absorption rate of veneer was 70%.Property of eucalypt scrimber making by crushing veneers with water absorption rate 70%was better.

关 键 词：疏解单板 桉木重组木 微观形貌 力学性能 耐水性能 

分 类 号：S792.39[农业科学—林木遗传育种] TS653[农业科学—林学]