Effect of Particle Size and Shape on Strength and Dimensional Stability of Resin-Bonded Wood-Particle Panels

Precisely-cut wood particles in the form of flat flakes, thin strands, helical ribbons, and cubes were converted to resin-bonded panels. The panels ranged from 0.5 to 1.05 specific gravity. They contained either 2, 4, or 8 percent phenolic resin and, in some cases, developed strength and dimensional stability comparable to plywood. Several particles derived from commercial materials are also included in this comparison. Particle shape, resin content, and density effects are related to bending strength, thickness change after water soaking, and linear expansion during cyclic exposure to 30 and 90 percent relative humidity. Panels made with 4-percent resin, of various surface textures and having excellent properties, are technically feasible when based on particles of sound fiber structure.

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