Low Cost Protein Glue for Southern Pine Plywood

A moderately alkaline soybean-blood glue containing 2.5 percent dialdehyde starch, a nonvolatile polymeric dialdehyde, was evaluated for hot-press bonding in southern pine plywood. Resistance to delamination exceeded commercial standard requirements for interior plywood. Shear strength was little affected by conditioning at relative humidity from 33 to 97 at 77?F. Wet shear strength following a 48-hour soak was approximately 50 percent of a dry shear. Costs were close to those for interior protein glues used in Douglas-fir plywood production.

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