High temperature drying of sugi [Cryptomeria japonica] boxed-heart square timbers by continuous measurement of moisture content distribution
2007
Sakai, T.(Toyama-ken. Forestry and Forest Products Research Center, Imizu (Japan)) | Hashimoto, A.
A measurement system was developed which could continuously measure the moisture content distribution during the high temperature drying of sugi boxed heat square timber, and the action of moisture content and relationships with drying damage such as surface cracks and the internal cracks were examined. The results obtained in this study were as follows: 1) A moisture content distribution could restructure with inverse-projection methods from the moisture content information of each layer estimated from electric resistance values. 2) The center temperature of boxed heat square timbers reached a steaming temperature of 98degC, after about 4-5 hours, and steaming treatment time was set at 12 hours. 3) It was confirmed that tensile drying-set was visually formed at a surface part in boxed heat square timbers which were dealt with the high temperature, and high temperature management required about 6 hours. 4) Of course the final moisture content is low when drying time is long, but it was proven that a considerable high moisture content area remained in the inside.
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