Effect of Flake Geometry on Mechanical Properties of Eastern Spruce Flake-Type Particleboard

Laboratory flake-type particleboards produced from eastern spruce flakes were evaluated for selected mechanical properties. The flakes were cut on a rotary lathe, and flake geometry variables were length (1 and 3 inches) and thickness 0.010 and 0.020 inches). Boards were made with 6 percent by weight urea-formaldehyde adhesive and pressed to one-half inch thickness at densities of 40 and 50 pcf. Board density was significant for all properties except linear expansion. Flake thickness was significant for MOE, IB, and screw withdrawal from the panel face. Flake length was significant for MOE, MOR, and IB. The highest average values of MOR and MOE (7,326 psi and 1.103 x 106 psi, respectively) were obtained with the 50 pcf board made with 3 by 0.010 inch flakes.

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