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Process for straightening and drying southern pine 2 by 4's in 24 hoursAuthor(s): Peter Koch
Source: Forest Products Journal, Vol. 21(5): 17-24
Publication Series: Miscellaneous Publication
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DescriptionIn 21 hours under mechanical restraint and in a kiln providing a cross-circulation velocity of 1,000 f.p.m. at dry-and wet-bulb temperatures of 240 and 160oF., followed by 3 hours at 195 and 185oF., southern pine 2 by 4 studs cut from steamed veneer cores or small logs were dried to 9-percent moisture content (Standard deviation was 3 percent). Compared to studs dried at temperatures not in excess of 180oF., the high-temperature studs were substantially straighter (crook, bow, and twist averaged 0.12, 0.21, and 0.09 inch), of higher grade (91 percent in SPIB grades 1, 2, and Stud), and not significantly weaker. Neither schedule caused casehardening. The high-temperature schedule took less than one-fourth the time and about one-half the total energy required by the low-temperature schedule. when lumber dried on both schedules was exposed to extremely humid or dry atmospheres, warp in the steam-straightened 2 by 4's remained less than that measured on conventionally dried studs.
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CitationKoch, Peter. 1971. Process for straightening and drying southern pine 2 by 4''s in 24 hours. Forest Products Journal, Vol. 21(5): 17-24
- High-temperature kilning of southern pine poles, timbers, lumber, and thick veneer
- Kiln time and temperature affect shrinkage, warp, and mechanical properties of southern pine lumber
- Time to dry 2-, 3-, and 4-inch S4S southern pine at 240°F as related to board width
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