辊压预处理对木材干燥速率和材性的影响  

Effect of Pretreatment Conditions on Drying Rate of Lumber Compressed by Rollers and Wood Properties

作　　者：杨胜丽[1] 温明宇[1] 杨庚[1] 孙耀星[1] 赵雪[1] 

机构地区：[1]北华大学,吉林132013

出　　处：《东北林业大学学报》2015年第12期69-73,共5页Journal of Northeast Forestry University

基　　金：国家自然科学基金项目(31470022);吉林省科技发展计划项目(20120260);吉林省教育厅"十二五"科学技术研究项目(2012-160);吉林省省级经济结构战略调整引导资金专项(2015Y079)

摘　　要：对柞木试材进行2种压缩方向（径向和弦向）、3种压缩率（10%、20%和30%）和3种压缩次数（1、4和9次）的辊压预处理,测试和研究不同辊压工艺处理材高频真空干燥的干燥速率变异和主要物理力学性能变异。结果表明：随着压缩率和压缩次数的增加,辊压预处理试材的干燥速率增大,变化率为7.78%～29.88%,干燥时间可缩短7.22%～21.97%;辊压预处理试材的密度和干缩率亦有增大的趋势,变化率分别为0.88%～6.58%和1.04%～13.13%;5种力学强度值逐渐下降,变化率分别为：顺纹抗压强度-13.01%～6.56%、顺纹抗剪强度-14.17%～4.67%、抗劈力-15.54%～4.11%、抗弯强度-12.29%～6.42%、抗弯弹性模量-20.17%～4.59%。We compressed the lumber of oak（ Quercus mongolica） by rollers in both radial and tangential directions under the compression rate of 10%,20% and 30% and at compression times of 1,4 and 9. We studied the variation characteristics of drying rate through high frequency-vacuum drying and the properties of the treated samples. The drying rate of treated ones increased with the rise of compression rate and its times,the variation coefficient of drying rate was in 7.78%-29.88%,and the rate of shortened drying hours was in 7.22%-21.97%. The density of treated samples and the shrinkage rate were increased gently with the rise of compression rate and its times,the variation coefficients were in 0.88%-6.58% and 1.04%-13.13%,respectively. The mechanical of wood decreased gently with the rise of compression rate and its times,the variation coefficient of shortened strength with the compressive strength parallel to the grain was in-13.01%-6.56%,with the shearing strength parallel to the grain was in-14.17%-4.67%,with the cleavage strength of wood was in-15.54%-4.11%,with the bending strength of wood was in-12.29%- 6.42%,and with the modulus of elasticity in static bending of wood was in-20.17%-4.59%.

关 键 词：辊压预处理 高频真空干燥 干燥速率 木材性质 

分 类 号：S781.3[农业科学—木材科学与技术]