单板条层积材密度梯度的研究  

Research on density gradient of parallel strand lumber

作　　者：王石建[1] 那斌[1] 高婧[1] 卢晓宁[1] 

机构地区：[1]南京林业大学木材工业学院,江苏南京210037

出　　处：《南京林业大学学报（自然科学版）》2012年第4期115-118,共4页Journal of Nanjing Forestry University：Natural Sciences Edition

基　　金：国家林业公益性行业科研专项项目;江苏省科技攻关项目(201104042);江苏省苏北科技发展计划(BC2011413);江苏省科技型企业技术创新资金项目(BC2010419)

摘　　要：通过不施胶压制单板条层积材(PSL)板坯,测定板坯各层的密度分布规律并对其进行统计分析。结果表明,板坯内各层的单板条压缩后密度呈正态分布。根据预测方程计算板坯密度梯度,并将密度梯度预测值与统计分布区间进行比较,结果表明,当热压压力低于5 MPa时,计算值能较好地与统计区间吻合,板坯密度梯度不大;当热压压力为5 MPa时,计算值与统计区间相差较大,经过分析修正,最终得出板坯密度梯度的计算模型。通过断面密度扫描试验,最终得出的计算模型能反映PSL板坯的密度梯度。Statistical analysis on the density distribution of each layer was made based on the PSL（ parallel strand lum- ber） pressed without glue. The result indicated that the density of each veneer strip after pressed met the normal distri- bution. The predicted value calculated by the model would be compared with statistical distribution range. When the pressure is lower than 5 MPa, the calculated value meets well with statistical distribution range. But when the pressure is 5 MPa, there is a great difference between them. And finally the density gradient model was confirmed. The result of face density scanning indicated that the density gradient model of PSL is accurate.

关 键 词：杨木单板 单板条层积材 密度分布规律 密度梯度 

分 类 号：TS612.1[轻工技术与工程]