Vertical density distribution characteristics and CT aided analysis of Chinese fir oriented laminated stick lumber

DU Chungui, CHEN Siguo, LIU Zhikun, ZHANG Qisheng*

JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2010, Vol. 34 ›› Issue (06) : 95-99.

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南京林业大学学报（自然科学版）
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JOURNAL OF NANJING FORESTRY UNIVERSITY ›› 2010, Vol. 34 ›› Issue (06) : 95-99. DOI: 10.3969/j.jssn.1000-2006.2010.06.021

Vertical density distribution characteristics and CT aided analysis of Chinese fir oriented laminated stick lumber

  • DU Chungui1, CHEN Siguo2, LIU Zhikun1, ZHANG Qisheng1*
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Abstract

The vertical densities of Chinese fir oriented laminated stick lumber(Chinese fir OLSL)with different densities were tested using Profile Density Analyzer. The profiles of Chinese fir OLSL were scanned using Computed Tomography(CT)in the length and width directions. The results showed that vertical density distribution of Chinese fir OLSL was changed in gradient. The density of the surface layer was higher than that of the inner layer, and the crest value of density of Chinese fir OLSL was in 1.0 mm away from panel surface layer. It can also be observed from the CT images that there are some pores in Chinese fir OLSL, and there are more and smaller pores in longitudinal section than in transaction, but the pores at the terminal are more and bigger than in the middle. The porosity of Chinese fir OLSL reduced along with the density increasing in the length and the width direction, Chinese fir OLSL does not fit for manufacturing low densities panels because its porosity increases along with decreasing of density. The CT could reveal vividly and intuitively the characteristics of vertical density of Chinese fir OLSL and its internal structure appearance as aided method.

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DU Chungui, CHEN Siguo, LIU Zhikun, ZHANG Qisheng*. Vertical density distribution characteristics and CT aided analysis of Chinese fir oriented laminated stick lumber[J]. JOURNAL OF NANJING FORESTRY UNIVERSITY. 2010, 34(06): 95-99 https://doi.org/10.3969/j.jssn.1000-2006.2010.06.021

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