Laboratory-Scale Development of a Structural Exterior Flakeboard from Hardwoods Growing on Southern Pine Sites

Reports a series of experiments designed to develop a 1/2-inch-thick, structural, exterior, mixed-species flakeboard functionally competitive with sheathing grades of plywood. The board design settled on was comprised of equal weight portions throughout of Carya sp., Quercus alba L., Quercus falcata Michx., Liquidambar styraciflua L., and southern pine (e.g., Pinus taeda L.). These species were cut with a shaping-lathe headrig to yield face flakes 0.015 inch thick and core flakes 0.025 inch thick. All flakes were 3 inches long; those used in the core were reduced in width by milling. Phenol-formaldehyde binder (5-1/2 percent) was blended with flakes initially at 4 percent moisture content. Just prior to pressing, the mat was water-sprayed on both sides. Press time was 5 minutes at 335?F. All the panels had random flake orientation in the core; half the panels had random faces; the other half had faces comprised of aligned flakes.

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