For the high-moisture-content green board sawn from young-growth sugi, pressdrying process was divided into three stages of first the heating, secondly the constant-rate drying and lastly the falling-rate drying, in which the change in moisture content of entire hoard could be characterized significantly by an exponential function with respect to hot pressing time, according to press-drying condition. Under every condition ranging from 140 to 200℃ and from 0.17 to 1.00 MPa, distortions of those warp-prone boards were reduced effectively without deteriorations of bending property. In particular, at 180℃ and 0.50 MPa, those boards could be press dried at a high rate without both developments of undue thickness shrinkage and unacceptable drying defect. However, alleviating the severe drying defects, which were infrequently caused irrespective of operationable condition, was demonstrated to be of importance in exploring the press-drying method available for those inferior green boards.
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