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    Author(s): C. -Y. Hse
    Date: 1976
    Source: Forest Products Journal 26(7):21-27
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.3 MB)


    One-half-inch-thick, 8tructural exterior composite panels of various constructions were made in a one-step process, with faces of eouthern pine veneer and corea of mixed southern hardwood flakes. The flakes were precisely machined to be 3/8-inch wide, 3 inches long and 0.015 inch thick. Two veneer, cross-laminated on each face over an oriented flake core, yielded the strongest panels. Panels with single veneer faces and random cores were most stable parallel to the grain of face plies. Average MOR of 9,153 psi and MOE of 1,731,000 psi for panels with single-veneer faces and random cores are considered more than adequate for most applications, even though these values are slightly lower than those of panels with two veneer on each face. Within the range of the experiment, the combinations of 1/16-inch, single-ply faces with a random core provided adequate strength and good dimensional stability. The simplicity of single-ply faces and the ease of forming random-flake cores made such construction the best candidate for a one-step hot press operation in existing panel plants. The panels had an average MOR of 10,400 psi and MOE of l,6969,000 psi. In vacuum-pressure-soak cycles the panels had water absorption of 101 percent and thickness swell of 24.2 percent; linear expansion parallel and perpendicular to the grain of face plies averaged 0.142 and 0.617 percent. Whole-panel density (at 5% MC) was about 41.8 pcf.

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    Hse, C. -Y. 1976. Exterior structural composite panels with southern pine veneer faces and cores of southern hardwood flakes. Forest Products Journal 26(7):21-27

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