Mill Evaluation of Dialdehyde Starch-Protein Glue for Hardwood Plywood Manufacture

A hot-press dialdehyde starch-protein (DAS-protein) glue was evaluated under mill conditions for use in Type II hardwood plywood manufacture. Panels were produced in two constructions of 288 panels each. All panels were 3-ply and 48 by 96 inches. One construction had 1/16-inch birch face, back, and core; the second construction had 1/26-inch birch face and hack with 1/8-inch loblolly pine core. Test results on the 576 panels fabricated with the experimental glue showed that the glue bond had good tolerance to such manufacturing variables as veneer moisture content, glue spread, closed-panel assembly time, and panel hot-press time. Data indicate that steam blows encountered in some phases of the tolerance study can be eliminated or reduced to acceptable levels by using feasible low hot-press temperatures, glue spreads, and hot-press times. Type II plywood glue bonds were satisfactory except where glue spread was purposely reduced to inadequate levels. The glue exhibited no unusual or undesirable characteristics in mill usage. Chief advantages of the experimental glue over traditional adhesives used in hardwood plywood manufacture are 1) increased productivity due to shorter press time, 2) lower glue cost, 3) absence of toxic fumes, and 4) easy plant and personnel clean-up.

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