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Internal Void Structure of Strandboard using X-ray Computed Tomography  

Oh, Sei Chang (Department of Forest Resources, Daegu University)
Publication Information
Journal of the Korean Wood Science and Technology / v.36, no.6, 2008 , pp. 13-22 More about this Journal
Abstract
Internal voids affecting the mechanical properties of wood composite were classified into two catagories and characteristics of voids were examined according to density variation of strandboard. The void distribution and content of strandboard according to board density were measured by X-ray computed tomography system and analized using image processing software. Prior to investigation, the densities of strandboard were measured by densitometer and the results were showed high correlation with conventional oven drying method. Based on the image analysis conducted on captured images by X-ray tomography, low resolution can be used to capture the macro-voids (between strand) but not the micro-voids (within strands). Intermediate resolution can be used to capture both the macro and the micro-voids and high resolution can be successfully used to capture the majority of the micro-voids. The content of macro-void was measured and content of micro-void was computed by corresponding related equation. The macro-void distribution can be successfully understood and void content can be correctly estimated through the results.
Keywords
X-ray computed tomography; void distribution; macro-void; micro-voids; strandboard; image processing;
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