Influence of Specific Gravity and Resin Content on Properties of Particle Board

Aspen and yellow birch flake boards were studied to determine effects of wood specific gravity, resin content, and board density on strength and stability. The aspen boards were stronger and more stable. The reason lies in the specific gravity of the wood and the requirements for a good glue bond. A given weight of flakes of a low specific gravity wood occupies a greater volume than the same weight of similar flakes of a wood of high specific gravity. When these volumes of wood are compressed to the dimensions of a board, higher relative contact will occur for the greater volume of wood, and a better glue bond between flakes results. There is greater glue spread per unit of particle surface for the birch flakes as compared with the aspen flakes, but the higher relative contact of the aspen flakes still controls strength properties for medium-density particle boards. For high-density particle boards, the glue spread per unit area of particle surface would become the controlling factor. Aspen is one of the hardwoods that will produce excellent flake board.

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