Influence of Rate of Drying and Rewetting on the Dimensional Changes of California Black Oak

Shrinkage in thin wafers of California black oak 1 inch by 1 inch in cross-section is shown to be significantly greater when the rate of drying was decreased, and when the temperature was increased from 70? to 140?F. Removal of water-soluble extractives increased shrinkage. Residual shrinkage after resoaking increased when drying was slow, but the rate of rewetting did not show any consistent effects. Residual shrinkage was small, and some results appeared contradictory, but it is concluded that results are not inconsistent with the view that creep and relaxation effects are important factors in the shrinkage of wood.

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