Variation in Shrinking and Swelling of Wood

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Abstract
The purpose of this paper is to point out that while the forces that cause wood to shrink and swell are chemical in nature, the factors which influence the degree of external dimension change are largely physical or mechanical. Orientation of the structural units, specific gravity or porosity of the wood, and the stresses set up by moisture gradients determine the change in external dimensions as the wood loses or gains moisture. Water-soluble extractives, because of their bulking effect, reduce the shrinkage of wood.

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