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Sawing to reduce warp in plantation red pine studsAuthor(s): Hiram Hallock; F.B. Malcolm
Source: Res. Pap. FPL-RP-164. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 27 p.
Publication Series: Research Paper (RP)
Station: Forest Products Laboratory
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DescriptionLarge volumes of red pine ( Pinus resinosa) from plantations in the Lake States and the Northeastern States are about to appear on the saw log market. One of the most important products of small saw logs is studs (2 in. x 4 in. x 8 ft.). A study has been conducted by the FPL which examines the relationship of two industrial and one FPL sawing method on the subsequent warp in the studs from this species. Results generally indicate that the species is suitable for studs. There is significantly less warp in studs sawn by the FPL method than the industry methods. Also one of the industry methods is significantly better than the other. The mean crook of studs from butt logs is much greater than in those from upper logs. The opposite is true with respect to twist. Studs sawn from the outside of the log are always lower in warp than from the inner area. This would appear to be the main reason for the superiority of the FPL method over the commercial methods. When all aspects of warp are considered the best industry method yielded 73 percent from butt logs and 84 percent from upper logs which met the "stud" grade of the new National Grading Rules. Comparable yields by the FPL method were 79 and 87 percent.
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CitationHallock, Hiram; Malcolm, F.B. 1972. Sawing to reduce warp in plantation red pine studs. Res. Pap. FPL-RP-164. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory. 27 p.
KeywordsRed pine, sawing, studs, warp
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