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Journal of Wood Science

Official Journal of the Japan Wood Research Society

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Bow variation in kiln-dried boxed-heart square timber of sugi (Cryptomeria japonica) cultivars

Journal of Wood Science volume 57, pages 363–370 (2011)Cite this article

Abstract

To evaluate the bow variation in boxed-heart square timber of sugi (Cryptomeria japonica), bows from kiln-dried timber for five sugi cultivars with different longitudinal shrinkage trends were compared for two stem heights. Two general trends were observed, depending on the cultivar: (1) either the bow was larger at the lower than at the upper part of the stem, or (2) the bows at the lower and the upper parts of the stem were similar. In timber that had larger bow values, the gradients of longitudinal shrinkage were large across the radius and along the length of the timber. There was a positive relationship between the bow and longitudinal shrinkage. These results suggest that the bow variation between the timbers was caused by a variation in longitudinal shrinkage, which was affected by the microfibril angle. Furthermore, the bow was inversely proportional to the modulus of elasticity, which suggests that timber with a low modulus of elasticity is susceptible to a large bow due to large longitudinal shrinkage.

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Authors and Affiliations

  1. Forestry and Forest Products Research Institute, Tsukuba, 305-8687, Japan

    Kana Yamashita, Yasuhiko Hirakawa & Shuetsu Saito

  2. Prefectural Agricultural, Forestry & Fisheries Research Center, Forest Products Research Laboratory, Imizu, Toyama, 939-0311, Japan

    Hiroshi Nakatani

  3. Forestry Research and Instruction Station of Kumamoto Prefecture, Kumamoto, 860-0862, Japan

    Motoyoshi Ikeda

Authors
  1. Kana Yamashita
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  2. Yasuhiko Hirakawa
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  3. Shuetsu Saito
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  4. Hiroshi Nakatani
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  5. Motoyoshi Ikeda
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Correspondence to Kana Yamashita.

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Yamashita, K., Hirakawa, Y., Saito, S. et al. Bow variation in kiln-dried boxed-heart square timber of sugi (Cryptomeria japonica) cultivars. J Wood Sci 57, 363–370 (2011). https://doi.org/10.1007/s10086-011-1194-x

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  • DOI: https://doi.org/10.1007/s10086-011-1194-x

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