摘要
以12mm厚意杨Populus deltoids板材为试材,在1MPa,100℃和2～5min条件下,实施横向热压密实试验,采用剖面密度梯度(VDP)测试仪获取了密实后速生杨木锯材的断面密度分布,并利用建立的"密度-压缩率"转换公式,转换为压缩率数据,从而实现了木材断面压缩率的准连续定量和定位。结果表明:①VDP技术可以准确定量密实后木材各厚度微层的压缩率;②意杨木材断面压缩率分布与剖面密度梯度类似,呈现表高芯低的宽"V"形;在试验工艺条件下,表层约50%厚度受到不同程度的压缩,最大压缩率达到34%～37%,而芯层未受到显著压缩。
Plantation wood,as a potential substitute for naturally grown wood used in flooring or furniture manufacture,is normally characterized by low-density and low-hardness,which compression can improve.To accurately locate and quantify the compression rate（CR） of Populus deltoides（poplar） lumber at each micro-layer of densified fast-growing wood,vertical density profile（VDP） technology was introduced.The 12 mm thick,fast-growing poplar lumber was compressed under 1 MPa at 100 ℃ for 2,3,and 5 min.Corresponding VDP data were transformed into CR data following a deduced mathematical equation and then graphically analyzed.Results showed that the compression rate distribution（CRD）,having a V-shaped curve,was similar to VDP with a maximum surface CR of 34%-37%.Meanwhile,the thickness in a core showed no great compression.Overall,VDP technology precisely quantified the different compression rates for different micro-layers of P.deltoides lumber.
出处
《浙江林学院学报》
CSCD
北大核心
2010年第5期799-802,共4页
Journal of Zhejiang Forestry College
基金
江苏省苏北科技发展计划项目(BC2009476)
关键词
林业工程
意杨
速生木材
密实化
剖面密度梯度
forest engineering
Populus deltoides
fast-growing wood
densification
vertical density profile
