Variation in moisture content of sugi [Cryptomeria japonica] boxed heart timber in Miyazaki prefecture [Japan] during kiln drying under high temperature and low humidity. 2: Distribution and change of moisture content
2005
Oda, H.(Miyazaki-ken. Wood Utilization Research Center, Miyakonojo (Japan)) | Ebihara, Y. | Sakoda, T. | Fujimoto, N. | Murase, Y.
Sugi (Cryptomeria japonica D. Don) boxed heart timbers from Miyazaki prefecture were kiln-dried at low humidity under two high-temperature conditions. The distribution of moisture content changes in moisture content and the generation of internal checks were examined. Our findings are summarized as follows: 1) In the examination with an intermediate period of steaming, a large difference in moisture content was observed depending on green timber weight. Each layer of timbers of 34 to 36 kg had a moisture content of about 6%, and layers of timber of 37 to 39 kg had a final moisture content ranging from about 6 to 40%. 2) In the examination with a surface-drying stage at a dry-bulb temperature of 75 deg C and a wet-bulb temperature of 68 deg C, variation of moisture content in the cross section were almost equalized during the steaming process that followed this stage. 3) The amount of moisture content reduction per hour during drying at a dry-bulb temperature of 120 deg C was about equal at 1.2 to 1.6% for both drying methods. 4) Internal checks seemed to be generated near moisture content of 30 to 40%.
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