Consolidation and Refinement Mark Progress in Glues and Gluing

Discusses a year of research focused on improving existing glues and processes. Note is taken of the increased use of insulation boards with ceramic adhesives such as calcium silicate as a binder. A modified nitrile phenolic made its debut as an adhesive. Simplified compositions that allow the user to make, or at least complete, his own phenol-formaldehyde resins were a breakthrough. Additives were developed for faster cure of exterior grade phenolics and anti-penetrants were developed which could give poor grades of veneer adequate bonds without penalizing cost or press time. Use of melamine-formaldehyde resins in top-grade hardwood plywood increased. Major effort in polyvinyl resin adhesives was aimed at reducing thermoplasticity and improving general durability under severe use. In gluing process research, effort continued on improvements in radio frequency electrostatic heating of polyvinyl acetate. Prepressing of plywood increased and activity continued on development of an automated plywood layup system.

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