Vertical densification gradient of Populus deltoides lumber with vertical density profile (VDP) technology
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摘要: 以12 mm厚意杨Populus deltoids板材为试材,在1 MPa,100 ℃和2 ~ 5 min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。图4参7Abstract: 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.[Ch,4 fig. 7 ref.]
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Key words:
- forest engineering /
- Populus deltoides /
- fast-growing wood /
- densification /
- vertical density profile
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链接本文:
https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.05.027
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