A Note on Effects of Kiln Stick Thickness and Air Velocity on Drying Time of Southern Pine 2 by 4 and 2 by 6 Lumber
Keywords:High temperature drying, moisture content, drying rate, kiln drying, air circulation, flexural properties
AbstractTo dry to 10% moisture content, 4- and 6-inch-wide lumber 1.75 inch thick required about 13.7 h (including 4 3/4-h kiln warmup time) in 5-ft-wide loads at 260 F (wet-bulb temperature was 180 F) on 1.0-inch-thick sticks with air cross-circulated at 1,000 fpm. If air velocity is increased to 1,400 fpm or stick thickness increased to 1.5 inches, kiln time required to reach 10% moisture content should be about 12.5 h (including 4 3/4-h kiln warmup time).
Koch, P. 1969. At 240°F southern pine studs can be dried and steam-straightened in 24 hours. South. Lumberman 219(2723):26, 28-29.nKoch, P. 1973. High temperature kilning of southern pine poles, timbers, lumber, and thick veneer. Proc., Am. Wood Pres. Assoc. 69:123-149.nKoch, P., W. Wellford, Jr., and E. W. Price. 1978. Continuous kiln dries southern pine studs nearly warp-free in about 12 hours. Pages 386-388 in C. W. McMillin, ed. Complete-tree utilization of southern pine: Symp. Proc., New Orleans, LA, April 17-19. For. Prod. Res. Soc., Madison, WI.n
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