Lumber recovery studies of Alaska sawmills, 1997 to 1999.

Abstract

This report looks at solid wood product recovery based on the results of 23 studies conducted from April 1997 to July 1999 of 22 sawmills in Alaska (during these years, these mills represented over 90 percent of the State's annual lumber production).Results for all mills studied within the State were reviewed for differences (1) in recovery by regions of the State, (2) in recovery by size of operation, or (3) by type of breakdown machinery. Two outstanding areas of opportunity to improve product recovery for nearly every sawmill within the State were reducing target thickness to eliminate oversizing and reducing sawing variation. There were no significant differences in product recovery when comparing studies by region, production level, or equipment type. Requirements of markets during these years were definite factors in sawmills produc ing oversized products. There was less thickness variation with bandsaw breakdown equipment than with circular saw breakdown equipment. Followup studies conducted at sawmills where improvements have been made would document the value of the improvements.

Trends in Lumber Processing in the Western United States. Part I: Board Foot Scribner Volume per Cubic Foot of Timber

“…Results from these surveys and censuses are available in recent publications on the forest products industry (Morgan et al 2004a(Morgan et al , 2004b(Morgan et al , 2005bBrandt et al , 2009Spoelma et al 2008;Halbrook et al 2009) and in approximately 55 additional publications dating back to 1970 (see the Appendix). Other sources (e.g., Haynes 1990, 1994;Kilborn 2004) were used for time periods or for states in which mill censuses were not available. With the exception of Colorado in the 1990s and Wyoming in the 1980s and 1990s, at least one mill census or other data source was available in each state during each decade (Table 1).…”

“…Mill residue factors for the 1980s and 1990s were derived directly from milllevel data from in-state surveys conducted during those decades, were estimated from mill surveys in other states during those decades, or were estimated from in-state mill surveys conducted from 2000 through 2006. Factors for Alaska before 2000 were developed from several sources Haynes 1990, 1994;Kilborn 2004). From 2000 through 2006, residue factors based on milllevel data from in-state surveys were available from mill surveys for all states except Washington.…”

Evaluación del refuerzo de asierre en madera seca y cepillada del ejido Pueblo Nuevo, Durango

“…Aunque en este estudio (St) no llegó a 1 mm, los 0.85 mm estimados en la variación del espesor de asierre representaron 17 % de pérdidas en materia prima; por tanto, se justifica, plenamente, implementar acciones correctivas al proceso para disminuir al máximo esa variación. Lo anterior es respaldado por Kilborn (2002), quien indica que si la variación en el corte de aserrío es mayor de 0.70 mm, esta podría asociarse con problemas de alineación, mantenimiento y operación de las máquinas. Por lo que la precisión en el corte de la sierra no debe tener una variación superior a 0.40 mm (Williston, 1988).…”

Alaska’s timber harvest and forest products industry, 2011

“…On average, Alaska sawmills produced approximately 1.27 board feet of lumber for every board foot Scribner of timber processed for an average overrun of 27 percent in 2005. A study by Kilborn (2002)…”