Knife- Versus Abrasive-Planed Wood: Quality of Adhesive Bonds

Abstract

Glueline strength ancl rlurability were determined for abrasive-versus knife-planed wood surfaces.La~ninated b r a n sections were made, 16 each of southern pine and Douglas-fir, iising 4 siirfacing treatnlents prior to laminating.The four treatments were knife planing, and abrasive planing with 36, 60, and 80 grit.Comparisons were made of resistance to gl~ielinc separation after accelerated aging, of bond shear strength, and of percentage wood failure within n species group.Under nlicroscopic examination, abrasive planing showed crushing and tearing of the wood si~rface, whereas knife planing showed a clean-cut stirface.Gluelines with abrasiveplaned surfaces were siinilar to the knife-planed in shear strength, were higher in percentage of wood failure, and lower in resistance to glucline separation upon accelerated aging.