Feasibility Studies on Gluing of Red Oak At Elevated Moisture Contents

A series of short experiments were run to define operating parameters associated with gluing green red oak. Laminate blanks specified by ASTM block shear tests were machined from green lumber with gross moisture contents in excess of fiber saturation point. Surfaces were “skin dried” by high voltage, 350?F. air, 350? platens, and infra-red lamps. The hot air and platen drying produced highest strength joints when a resorcinol adhesive was used. Urea, melamine, and casein adhesives either failed or produced lower strength joints. Moisture content at time of gluing, surface treatment, press condition, and moisture content at time of testing were significant factors at the 5 percent level. The hot air skin drying sequence produced higher shear values than did the hot platen sequence. Relative values are presented.

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