SPECIAL METHODS OF SEASONING WOOD
FOREST PRODUCTS LAB MADISON WIS
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The solvent seasoning method for lumber which was developed by the Western Pine Association Research Laboratory is described. The process involves treating the wet wood with a hot solvent, acetone, maintained above the boiling temperature of water to extract the desired amount of water. The residual solvent is then boiled off and recovered along with wood extractives. Wood can be dried by this method more rapidly than by ordinary methods such as kiln drying. The process apparently does not reduce the strength of the wood. The practicability of this method of drying wood will depend upon the value of the extractives as well as the savings resulting from shorter drying time and improvement of the lumber. The McDonald process or azeotropic drying uses a commercial dry-cleaning solvent, perchloroethylene, which is not miscible with water.