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《Journal of Nanjing Forestry University(Natural Sciences Edition)》 2010-06
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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(1.School of Engineering,Zhejiang Agriculture and Forestry University,Lin′an 311300,China;2.Alberta Research Council,Edmedon T6N 1E4,Canada)  
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.
【Fund】: 浙江省自然科学基金项目(Y304029);; 浙江省"十五"重点攻关项目(011102164);; 国家与浙江省农业科技成果转化资金项目(03EFN213300104 2003D70078)
【CateGory Index】: TS653
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