Developments in the Production of Multi-Layer Foamed Wood Particleboards

The properties of foamed wood particleboards produced with polyurethane foam are described and numerous technical considerations in commercial production of foamed particleboards are discussed. The major advantages of using foamed plastics as a binder are low weight, low hygroscopicity, high strength, and excellent insulating properties. Although it appears technically feasible to produce a light-weight foamed particleboard that will meet the specifications for exterior construction, the cost of plastic foams is presently a prohibiting factor. Schematic diagrams of installations designed to produce light-weight wood particleboards using polyurethane foams in an intermittent single-opening press and in a continuous press with a system for double foil coating are presented.

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