Tannin-based cold-setting adhesives for face lamination of wood

Abstract

Tannin-based adhesives, in which 50-70 percent of resorcinol in PRF resins was substituted by tannin from pecan nut pith, were formulated for face-lamination of wood under cold-setting conditions. Synthesized tannin-based resins were also modified by further addition of pecan tannin. Bonds were tested in block-shear on the wood of Douglas-fir, spruce and southern pine according to AITC-107 and AITC-110 standards. Some of these tannin-based adhesive formulations meet the strength and wood failure requirements when bonding Douglas-fir and spruce.