We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Impacts of high-temperature and restraint on kiln-dried grand fir studs curve sawn from small-diameter logs.
- Authors
Deutschlander, Heidi M.; Wagner, Francis G.; Folk, Richard L.; Shook, Steven R.; Everson, Dale O.
- Abstract
A total of 1,800 grand fir (Abies grandis) studs, curve sawn from small-diameter (approximately 4 to 7 in [102 to 178 mm]) sawlogs, were kiln-dried to determine the effects of drying schedule and restraint on energy consumption, drying time, and warp (bow, crook, and twist). The experimental design included 18 kiln charges with 3 replications of 3 kiln schedules. Nine of the kiln charges were restrained and nine were unrestrained. Kiln schedules were high-temperature (24°F [116°C] dry bulb with no venting or steam spray), elevated (190° to 220°F [88° to 104°C] dry bulb and 190° to 165°F [88° to74°C] wet bulb), and conventional (180°F [82°C] dry bulb and 170° to 145°F [77° to 63°C] wet bulb). Restraint loading was 200 pounds per square foot (psf) (976 kg/m²). Results showed that the high-temperature schedule consumed approximately one-third and one-half of the energy of the elevated and conventional schedules, respectively. In addition, drying time averaged 21.1 hours with the high-temperature schedule. 42.0 hours with the elevated schedule, and 50.3 hours with the conventional schedule. Although there were several significant differences in bow, crook, and twist in lumber dried by the three schedules, no schedule showed significantly lower warp. Results also showed that restraint reduced warp in lumber in the high-temperature and elevated schedules, and much of the warp reduction was in lumber within the top six courses of the stack. In addition, restraint reduced the variance of warp in lumber dried by all three schedules.
- Subjects
ABIES grandis; FIR; LUMBER; WOOD products; KILNS; ENERGY consumption
- Publication
Forest Products Journal, 2006, Vol 56, Issue 2, p78
- ISSN
0015-7473
- Publication type
Article