Increasing the market value of Japanese sugi [Cryptomeria japonica] and hinoki [Chamaecyparis obtusa] damaged by insects, 1:
2009
Tokuda, M.(Mie Univ., Tsu (Japan). Faculty of Bioresources) | Uchisako, T. | Suzuki, N. | Kise, M. | Takada, Y.
Recently, Sugi and Hinoki damaged by insects (Anaglyptus subfasciatus, cryptomeria twig borer) are common in Mie area. Canal type hole and discoloration of damaged wood around the hole diminish the value of sown lumber. To promote consumption of damaged wood, grading of lumber based on scientific data is inevitable. Four subjects were investigated, 1) distribution of damage, 2) effect of damage on bending stiffness and strength of wood, 3) expansion of discolored area and 4) sensory evaluation of damaged lumber. In this paper, 1), 2) and 3) are discussed. The following results were obtained. (1) The number of damaged area was no more than three per square meter for board, and no more than three for one side plane of a column (105 x 105 x 3000mm). (2) Degradation of MOE estimated by model bending tests was about 2% and 5% for MOR. (3) Discoloration of damaged area did not expand after outdoor exposure. There was a little difference in color between damaged wood and sound wood after exposure.
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