Effect of Kiln Conditions on the Dimensional Stability of Douglas-Fir and Western Hemlock

The effect of kiln conditions on the dimensional stability and EMC of the wood was studied for small clear specimens of Douglas-fir and western hemlock. The temperatures selected were 90, 150, 180, 195, 215, and 230?F. At each temperature, conditions for EMC of 6 and 12 percent were applied, and prolonged heating was studied by doubling kiln resident time required at each temperature with conditions for EMC of 6 percent. Increasing temperature had the greatest influence in reducing subsequent shrinkage and swelling and lowering the EMC of the wood, but the influence of conditions for EMC and prolonged heating was small in reducing shrinkage and swelling and lowering the EMC of the wood.

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