Changes of decay and termite durabilities of Japanese larch (Larix leptolepis) wood due to high-temperature kiln drying processes |
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Authors: | Shuichi Doi Masakazu Aoyama Shigeru Yamauchi Yasuji Kurimoto |
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Institution: | (1) Graduate School of Life and Environmental Sciences, University of Tsukuba, Tsukuba 305-8572, Japan;(2) Institute of Wood Technology, Akita Prefectural University, Noshiro 016-0876, Japan;(3) Department of Applied and Environmental Chemistry, Kitami Institute of Technology, Kitami 090-8507, Japan |
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Abstract: | We investigated the effects of high-temperature drying schedules (120°–130°C) on decay and termite feeding of Japanese larch
timbers. Thermogravimetric analysis was conducted to investigate changes of the wood components. Decay and termite feeding
tests showed that specimens dried under high-temperature schedules were susceptible against a decaying fungus Fomitopsis palustris and attacks from termites Coptotermes formosanus and Reticulitermes speratus. These drying schedules changed chemical components, which were suggested by the thermal analytical result compared to the
control sample. The results of this study indicated that the acceleration of termite feeding takes place even under temperatures
that are comparatively lower than that used in our previous research in which 170°C steaming treatment was applied to Japanese
larch wood. Decay durability against a brown rot fungus also decreased, possibly from production of low molecular weight fragments
when hemicellulose decreased during the high-temperature drying processes. |
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Keywords: | Japanese larch High-temperature drying Decaying fungi Termite feeding Durability |
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