High Temperature Drying of British Columbia Softwoods

A high-temperature kiln of 100 bd. ft. capacity has been built for the Canadian Forest Products Laboratory. Air velocity can be maintained between 400 and 1100 feet per minute and temperatures as high as 265?F. can be attained. The load is placed on a scale so that moisture loss can be monitored. The wood darkens during drying. Moisture absorption is lowered. Time to dry is much less than found with conventional kiln-drying; for example one inch western hemlock was dried from 57 percent to 9 percent using a dry bulb of 265?F. in only 16-3/4 hours. Numerous other charges were run at temperatures from 220?F. to 265?F. on both western hemlock and Douglas-fir.

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