Green dimensioning below-grade red oak logs: A Minnesota case study

Citation
Sm. Bratkovich et al., Green dimensioning below-grade red oak logs: A Minnesota case study, FOREST PROD, 50(2), 2000, pp. 65-68
Citations number
7
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Plant Sciences
Journal title
FOREST PRODUCTS JOURNAL
ISSN journal
0015-7473 → ACNP
Volume
50
Issue
2
Year of publication
2000
Pages
65 - 68
Database
ISI
SICI code
0015-7473(200002)50:2<65:GDBROL>2.0.ZU;2-3
Abstract
A combination hardwood thinning and selection harvest in north central Minn esota generated a mix of veneer logs, high- and low-grade sawlogs, and belo w-grade red oak (Quercus spp.) logs representative of pallet and firewood q uality material. A sample of 100 of the below-grade logs was selected for p rocessing at a commercial pallet mill. The sample logs had an average small -end diameter-inside-bark and length of 9.5 and 101 inches, respectively. A circular saw (primary breakdown) and gang and horizontal resaws and chop s aws (secondary breakdown) were utilized to process the below-grade logs int o 4/4 dimension and pallet parts. Forty-eight percent of log scale volume ( scaling yield) was converted into clear dimension parts. Total yield, expre ssed as cubic feet of dimension and pallet parts output per cubic feet of l og input, was 31 percent. Sixty-one percent of the total product output fro m the sample logs was in clear, defect-free, green dimensioned parts in len gths of 12 to 43 inches and widths of 1-3/4, 2-3/4, and 3-1/2 inches. The l onger 38- to 43-inch parts comprised nearly 30 percent of the total dimensi on part volume. Pallet parts, in 42- and 48-inch lengths and a width of 3-1 /2 inches, accounted for the remaining 39 percent of product output. Total product yield, for dimension and pallet parts, was 197 and 125 board feet p er cord, respectively.