Short communication. Lumber yield and production time in sawmilling of pallets in Durango, Mexico

摘要

Aim of study : Evaluate times and yields in the transformation of pine logs to pieces of pallets. Area of study: Four sawmills of the forest region of El Salto, Durango, Mexico. Material and methods : The sample size was 388 logs with 32.91 m 3 as volume without bark grouped in four diameter classes and five taper classes. The transformation time was estimated using the “Snap-back timing” method, and yield was defined as the ratio between pallets and log volume. Main results : The time required to obtain 1000 bft of pallets is approximately 5.8 hours and the mean yield is 56%. This means that for each cubic meter of logs without bark, it is possible to obtain 240 board feet of pallets (bft). In addition, 4.16 m 3 of logs without bark are required to obtain 1000 board feet of pallets. The estimated mean productivity was 0.54 m 3 /h. Research highlights: As the log diameter increases, yield also increases. The taper of the logs was not significant in the transformation yield. Key words : Indicators of productivity; pallets; diameter logs; taper; sawmilling process; lumber yield; raw material; Mexico.