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Microstructure of viscoelastic thermal compressed (VTC) wood using computed microtomography

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  • The paper describes for the first time the analysis of the structure of compressed wood using computed tomography. The anatomical structures of Douglas-fir and hybrid poplar before and after densification with the Viscoelastic Thermal Compression (VTC) process were described by pore size distributions and mean pore sizes and compared. The compression of Douglas-fir mainly affected earlywood, while the compression of hybrid poplar mainly occurred in the vessels. In both wood species the densification resulted in a significant decrease in the pore volumes. The porosity decreased to less than the half of the original value for Douglas-fir earlywood and to approximately one quarter for the vessels in hybrid poplar. The relevant mean pore sizes also decreased dramatically down to about one quarter compared to the original values. In contrast, latewood in Douglas-fir and libriform fibers in hybrid poplar are quite stable under compression. Douglas-fir latewood retained its original structure after compression and did not show any reduction in pore size. The results confirmed that the anatomical structure of VTC densified wood can be described by pore size distributions and mean pore sizes. However, in the case of broad or bimodal distributions the mean pore sizes are of less significance.
  • Keywords: Pore size distribution, Computed microtomography, Image analysis, VTC wood, Granulometry, Porosity
  • Keywords: Pore size distribution, Computed microtomography, Image analysis, VTC wood, Granulometry, Porosity
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  • Standfest, G., Kutnar, A., Plank, B., Petutschnigg, A., Kamke, F. A., & Dunky, M. (2013) Microstructure of viscoelastic thermal compressed (VTC) wood using computed microtomography. Wood Science and Technology, 47 (1): 121-139.
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  • 47
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  • 1
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  • This project was gratefully supported by the ‘FHplus in COIN’ Programme of the Austrian Research Promotion Agency (FFG) under project number 198353.
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