Gluing of Southern Pine Veneer with Blood Modified Phenolic Resin Glue

A study was made of the influence of dried soluble beef blood as a modifier of exterior phenolic glue for southern pine plywood. Percent blood level, hot press time, rate of spread, closed assembly time, and pre-press time were evaluated for effect on shear strength and percentage wood failure. Based upon the boil test, the highest shear strength and wood failure were obtained at a 5-percent blood level, a 5.5-minute hot press time, a 90-pound spread rate, a zero-closed assembly time, and a 4.5-minute prepress time. There was no difference in the plywood quality produced using five different lots of blood. The resin used for the adhesive was Borden Chemical Co.W-163 phenolic resin. Formulation was made with no blood and with 2-1/2 percent, 5 percent, and 10 percent blood. The panels were hot pressed in a 12-inch by 12-inch electrically-heated press. All panels were pressed at 175 psi and with 285?F. platen temperature.

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