Gluability of Platen-Dried Veneer of Douglas-Fir

Because increased platen temperatures may be one way of offsetting low productivity with platen dryers, this study determined how platen drying at temperatures ranging from 325?F to 460?F affected strength and durability of adhesive bonds between veneers from second-growth Douglas-fir. Veneers ranging in thickness from 0.1 to 0.4 inch were glued into two-ply parallel laminates with equal success at most temperatures. Decreases in bond quality occurred when 0.4-inch veneers were dried for long periods at the lowest temperature tested (325?F) and when 0.1-inch veneer was dried at high temperature. Breaking load after vacuum-pressure-soak was found to be the best estimator of bond quality because percentage of wood failure was very high at all conditions evaluated. Platen drying resulted in reduced shrinkage in veneer sheet width, but this reduction was offset by increased shrinkage in sheet thickness.

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