Abstract

Boards for lumber cores of plywood, for solid-dimension stock, such as chair seats, solid tops, etc., are still almost universally edge-glued together with conventional cold-setting glues, i.e., animal, vegetable, and casein. Veneers are still widely taped together and, when edge-glued without tape, are generally glued with prespread animal glue. This paper describes new methods and machines for edge-gluing lumber and veneer with waterproof and water-resistant heat-setting adhesives, particularly urea-form-aldehyde resin, and points out the advantages gained through adoption of these new methods.

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