Impact of kiln variables and green weight on moisture uniformity of wide grand-fir lumber

Eighteen kiln runs of grand-fir (Abies grandis) dried to determine the impact of kiln variables and green weight on moisture uniformity of grand-fir lumber. Each of the 18 kiln runs contained 52 pieces of nominal 2-inch by 10-inch by 8-foot (38-mnm by 235-mm by 2.44-m dry-dressed size) lumber, which included 4 full-length sample boards that were weighed prior to drying. Time schedules were employed and kiln variables such as dry-bulb temperature, maximum depression, and fan-reversal time were varied for each run. Results showed that moisture uniformity was not achieved with changes of kiln variables. However, study results did indicate that moisture uniformity of wide (largely heartwood) kiln-dried grand-fir lumber could be improved through presorting green lumber by weight and that drying times may be reduced for kiln runs with low-weight boards.

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