High Drying Temperatures–Do They Harm Douglas-Fir Veneer?

Within the same veneer source, drying temperatures above 400?F. resulted in loss in breaking strength of Douglas-fir plywood. Strength losses were found in plywood from veneer dried in direct-fired dryers heated by either gas or oil, and from veneer dried in an electric oven. Wood failure was not a reliable indication of glue-bond durability for plywood made from veneers dried at high temperatures. Veneers dried in oil-fired dryers had the least durable glue bonds. Sooty surface deposits were found on veneer from three different oilfired dryers. The water-absorbing capacity of veneer was reduced by increasing the drying temperature with a constant drying time, or by increasing the drying time at a constant temperature.

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