Vibrational properties of heat-treated green wood |
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| Authors: | Yoshitaka Kubojima Takeshi Okano Masamitsu Ohta |
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| Institution: | (1) Forestry and Forest Products Research Institute, Ministry of Agriculture, Forestry and Fisheries, Tsukuba Norin Kenkyu Danchi-nai, PO Box 16, 305-8687 Ibaraki, Japan;(2) Graduate School of Agricultural and Life Sciences, The University of Tokyo, 113-8657 Tokyo, Japan;(3) Present address: Wood Information Hall, Wood Product Information Desk, Woodyland Tokyo, 135-0052 Tokyo, Japan |
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| Abstract: | To investigate the influence of water on heat treatment, green wood was heat-treated. Sitka spruce (Picea sitchensis Carr.) with about 60% moisture content (MC) was used. Young's modulus and loss tangent were measured by the free-free flexural vibration test. The specimens were heated in nitrogen at 160°C for 0.5h. The results were as follows. (1) Recognizing that the effects of heat treatment are mild and that the same specimens cannot be used for both heat treatment and as controls, it was necessary to investigate the effects of the heat treatment based on the variations of properties in the whole of the test lumber. (2) Young's modulus increased and the loss tangent decreased due to heat treatment. When the vibrational properties were measured at various MCs, the MCs at the maximum value of Young's modulus and the minimum value of the loss tangent were lower in heat-treated specimens than in controls. The effects of heat treatment in green wood were similar to those in air-dried wood. (3) The loss tangents of heat-treated specimens were smaller than those of controls at about 0% MC but were larger than those of controls at about 10% MC. We thought that this resulted from the decreased MC at the minimum loss tangent after the heat treatment mentioned above. (4) The properties measured at several MCs were more useful than those at only one moisture content for investigating the effects of heat treatment.This study was presented in part at the 46th annual meeting of the Japan Wood Research Society, Kumamoto, April 3–5, 1996; and at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 3–5, 1997 |
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| Keywords: | Green wood Heat treatment Vibrational properties Variation in wood Moisture content |
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