刨花形态和跌落高度对刨花定向效果的影响  

Effect of strand shape and drop height on strands orientation

作　　者：胡尧琼 李万兆 张晔 梅长彤 HU Yaoqiong;LI Wanzhao;ZHANG Ye;MEI Changtong(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037,China)

机构地区：[1]南京林业大学材料科学与工程学院,南京210037

出　　处：《林业工程学报》2023年第4期66-71,共6页Journal of Forestry Engineering

基　　金：国家重点研发计划(2021YFD2200602);江西省林业局科技创新专项(202135)。

摘　　要：定向刨花板(OSB)是一种应用广泛的木质结构材,其基本组成单元是窄长薄片刨花,刨花定向铺装角度是影响OSB力学性能的重要因素。以刨花长度、宽度和跌落高度为影响因子,统计分析以上因子对刨花定向角度的影响,拟合出优化试验参数对应刨花定向效果的正态分布曲线。刨花跌落高度对定向角度影响显著,其次为刨花长度和宽度。分析刨花长宽比与定向角度绝对值的关系,重点关注定向角度绝对值小于10°,15°和30°的刨花占比。当刨花长宽比小于8时,长宽比与刨花定向效果呈线性正相关,长宽比接近8时,刨花定向效果最佳。刨花长度×刨花宽度×跌落高度的优化参数分别为150 mm×20 mm×80 mm、150 mm×15 mm×80 mm、150 mm×10 mm×80 mm和120 mm×20 mm×80 mm,结合正态分布拟合曲线得出90%概率条件下,4组试验所得刨花定向角度的置信区间均小于30°,而150 mm×20 mm×80 mm试验参数条件下刨花定向效果最佳。本研究系统分析了使用定向导板控制窄长薄片刨花的定向效果,优化了刨花形态和跌落高度的参数,刨花定向角度的量化分析预测可以为OSB力学性能的预测提供基础科学依据。Basic composition component of oriented strand board(OSB)is long and thin slice strand.OSB is a renewable,reusable,and recyclable resource and an alternative to structural plywood for a wide range of lightweight timber frame construction with high variability in flexural properties.The directional paving angle of strand is one of the most important factors affecting the mechanical properties of OSB.Considering the length and width of the strand and the drop height after crossing the directional guide plate as the interfering factors,the influence of the above factors on the orientation angle of the strand was analyzed statistically,and the curve normal distribution of the orientation effect of the optimized test parameters was fitted.During the experiments,the strands fell freely onto the guide plate,and then scattered on the base plate after being oriented by the guide plate.The height of strand drop had a significant effect on the orientation angle,followed by the length and width of the strand.When the aspect ratio of strand was smaller than eight,the length-width ratio was linearly and positively correlated with the orientation effect of the strand,and when the length-width ratio was close to eight,the orientation effect of strand was the best.The optimized parameters of the strand length×strand width×drop height were 150 mm×20 mm×80 mm,150 mm×15 mm×80 mm and 150 mm×10 mm×80 mm,respectively.When the length-width ratio was greater than eight,the reduction of the strand width would lead to the increase of the aspect ratio,while the change of the width had slight influence on the orientation effect.Combined with the fitting curve of normal distribution,the confidence intervals of the strand orientation angles obtained by the three groups of tests were all small than 30°under the condition of 95%probability.It was further explained that the change of particle width had no obvious influence on the orientation effect compared with the change of particle length.In this study,the influence of strand shape an

关 键 词：定向刨花板 刨花形态 跌落高度 定向角度 统计分析 

分 类 号：S784[农业科学—林学]