Distribution of Extractives in Solvent Seasoned Redwood Lumber

In redwood boards that were solvent seasoned, the least amount of water solubles was present in the outer layer, with larger quantities in the intermediate layer and inner core. The quantity of water solubles in the outer layer was only about one-third of the amount found in the corresponding layer of the kiln-dried boards. Hot alcohol solubles followed this same pattern of distribution. Preliminary results indicated that considerable quantities of extractives are removed from the surfaces of redwood lumber during the solvent extraction cycle. It has still to be determined whether sufficient extract has been removed to provide a means of controlling stain. These initial results indicated that the chemical drying process is much more rapid than the conventional commercially used seasoning methods. In addition, this process provides a method for recovering some extractives as a chemical byproduct otherwise unavailable from lumber.

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