Straight Studs from Southern Pine Veneer Cores and Cordwood

Seven alternate processes for converting southern pine veneer cores into 8-foot studs were studied for strength and elastic modulus in flatwise bending, edgewise bending, full-length compression, and full-length tension; regression relationships were calculated. Strengths were adequate for loads normally imposed on studs. The process that gave greatest promise for commercial applicability consists of center-ripping the green core, blanking out a stud from each half-core on a chipping surface edger, kiln-drying the oversize blanks, and then removing drying distortions, by face jointing followed by thicknessing and, straight-line ripping. Ultimate strengths averaged 5,200 psi in edgewise bending; 4,830 psi in full-length compression; and 2,860 psi in full-length tension. For an estimated cost of $300,000 an existing plywood plant could be equipped to manufacture kiln-dry studs from cores. Total investment, including working capital, is estimated at $400,000. These figures are based on a price of $0.212 per core and a net sale price of $5 per ton for dry wood waste and an average net selling price of $75 FOB mill per Mbf of kiln-dry S4S studs. Costs are projected for using 8-foot and 4-foot bolts.

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