Effect of two drying schedules on spruce pine lumber defects
1997
Shupe, T.F. | Harding, O.V. | Choong, E.T. | Mills, R.H.
A local millwork facility was interested in an alternative, less expensive species as a raw material. They specified crook, bow, and twist as major concerns in accepting any alternative species. Therefore, two spruce pine (Pinus glabra Walt.) trees were felled, bucked into 8-foot logs, and milled for optimal grade on a Wood Mizer portable bandsaw mill. The lumber was milled into dimensions of 2 by 4 inches and 2 by 6 inches. Each dimension class was divided into two groups. The groups were dried to an average moisture content of 8 percent +/- 2 percent. One group was dried according to a conventional schedule, the other to a high-temperature, southern yellow pine schedule. Single factor t-tests revealed no statistical difference for final width and crook. The conventional schedule yielded significantly less bow, bow per foot, and crook per foot. These preliminary results indicate that spruce pine can be dried with minimal defects using a conventional southern yellow pine drying schedule. Therefore, because of spruce pine's ability to grow rapidly in mixed hardwood stands and its slightly less favorable wood properties, it should become a competitive alternative at a much lower stumpage price for the millwork industry.
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