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Internal-check variation in boxed-heart square timber of sugi (Cryptomeria japonica) cultivars dried by high-temperature kiln drying |
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| Authors: | Kana Yamashita Yasuhiko Hirakawa Shuetsu Saito Motoyoshi Ikeda Masamitsu Ohta |
| Institution: | 1. Forestry and Forest Products Research Institute, Tsukuba, 305-8687, Japan 2. Forestry Research and Instruction Station of Kumamoto Prefecture, Kumamoto, 860-0862, Japan 3. Graduate School of Agricultural and Life Sciences, The University of Tokyo, Tokyo, 113-8657, Japan |
| Abstract: | To investigate the wood properties affecting the internal-check variation in boxed-heart square timber of sugi (Cryptomeria japonica), two cultivars, yabukuguri and kumotooshi were kiln-dried together by the high-temperature setting method and their internal checks were compared. There was a difference in the area of internal checks between the cultivars. Kumotooshi formed a larger area of internal checks, which was thought to be affected by the larger tangential shrinkage of kumotooshi. The number, total length, and total area of internal checks were significantly correlated with tangential shrinkage. The area of internal checks around the pith was also larger for kumotooshi, which might be affected by the larger tangential shrinkage in the core part of kumotooshi. The results supported that tangential shrinkage should be one of the important properties affecting the internal-check variation of sugi boxed-heart square timber. |
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