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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