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当前位置: 首页 > 文章 > 桉树无性系大径材干燥特性分析 南方农业学报 2017 (5) 896-900
Position: Home > Articles > Drying characteristics of Eucalyptus clones with large-diameter Journal of Southern Agriculture 2017 (5) 896-900

桉树无性系大径材干燥特性分析

作  者：
刘媛;卢翠香;黄腾华;陈健波;项东云
单  位：
广西林业科学研究院/广西优良用材林资源培育重点实验室/国家林业局中南速生材繁育实验室
关键词：
桉树;大径材;干燥特性;干燥基准;百度试验法
摘  要：
【目的】分析桉树无性系大径材的干燥特性,并预测其干燥基准,为桉树大径材的实木利用提供科学依据。【方法】采用百度试验法研究10年生尾巨桉无性系大径材的干燥特性,根据木材干燥过程中初期开裂、内部开裂和截面变形3项干燥缺陷的发生程度,制定桉树大径材干燥基准。【结果】桉树无性系大径材初期开裂程度2级;内部开裂程度中等,为3级;截面变形严重,为4级。干燥速度为4级,干燥速度较慢,属难干木材。体积、径向和弦向干缩率较大,分别为19.656%、10.976%和9.451%;差异干缩值为0.861,属差异干缩小。根据3种缺陷的等级程度,确定桉树无性系大径材干燥基准的基本条件:初期温度50℃,初期干湿球温度差2~4℃,末期温度75℃;厚度为25~30 mm的桉树无性系木材窑干至水含率10.00%所需时间为20.75 d。【结论】截面变形是桉树无性系大径材的主要干燥缺陷,为防止其发生,在生产中应以初期温度50℃、初期干湿球温度差2~4℃、末期温度75℃为干燥基准,可根据实际情况进行适当调整。
译  名：
Drying characteristics of Eucalyptus clones with large-diameter
作  者：
LIU Yuan;LU Cui-xiang;HUANG Teng-hua;CHEN Jian-bo;XIANG Dong-yun;Guangxi Forestry Research Institute/Guangxi Key Laboratory of Superior Timber Trees Resource Cultivation/Key Laboratory of Central South Fast-growing Timber Cultivation of Forestry Ministry of China;
关键词：
Eucalyptus;;big-diameter wood;;drying characteristic;;drying schedule;;100 ℃ test method
摘  要：
【Objective】In the present paper, drying characteristics of Eucalyptus clones with large-diameter were studied,and the drying schedule was predicted, in order to provide scientific basis for the utilization of Eucalyptus big-diameter wood. 【Method】Drying characteristics of 10-year-old Eucalyptus clones with large-diameter were studied by 100℃ test method. On the basis of drying defects, namely initial crack, internal crack and cross-section deformation during wood drying process, the drying schedule of Eucalyptus big-diameter wood was proposed. 【Result】The initial crack was grade 2;internal crack degree was moderate, being grade 3; degree of cross-section deformation was serious, being grade 4. Drying speed was grade 4, which meant the drying speed was slow and Eucalyptus a the wood dried slowly. Volume dry shrinkage rate(19.656%), radial dry shrinkage rate(10.976%) and tangential dry shrinkage rate(9.451%) were large; difference dry shrinkage(0.861) was small. According to the grades of the three defects, the basic conditions of drying schedule were as follows: under the condition of initial temperature 50 ℃, difference between wet and dry bulb temperatures at initial period 2-4 ℃, temperature at late drying period 75 ℃, it took 20.75 d to dry Eucalyptus clones with large-diameter with 25-30 mm thickness to 10.00% moisture content. 【Conclusion】The main defect is section deformation. In order to avoid it, the drying schedule should be initial temperature 50 ℃, difference between wet and dry bulb temperatures at initial period 2-4 ℃,temperature at late drying period 75 ℃ in actual production. This schedule can be adjusted based on specific condition.

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