Production costs in the log processing of Eucalyptus spp. wood

Abstract The objective of this study was to evaluate the production costs of processing logs from Eucalyptus grandis Hill ex Maiden and Eucalyptus saligna Sm, using two sawing pattern in a medium-sized sawmill. Alternating tangential sawing pattern was used for logs with a mean diameter of 33.0 cm and the radial sawing pattern for logs with a mean diameter of 47.0 cm. Based on the data obtained in the different sawing pattern, the fixed, variable and total costs were calculated and, subsequently, the average value for each of these costs. For the alternating tangential sawing pattern, the fixed cost represented 19.32% and the variable cost 80.68%. For the radial sawing pattern, the fixed cost represented 18.92% and the variable cost 81.08%. The radial sawing pattern presented lower average production costs, with a difference of 22.89 R$/m³, however there is no significant difference between the sawing pattern.

摘要 本研究旨在评估在中型锯木厂中，采用两种锯切模式加工巨桉（Eucalyptus grandis Hill ex Maiden）与柳桉（Eucalyptus saligna Sm）原木的生产成本。针对平均直径33.0cm的原木采用交替弦切锯切模式，平均直径47.0cm的原木则采用径向锯切模式。基于不同锯切模式下获取的数据，分别计算固定成本、可变成本与总成本，并随后求取各类成本的平均值。在交替弦切锯切模式下，固定成本占比为19.32%，可变成本占比为80.68%；在径向锯切模式下，固定成本占比为18.92%，可变成本占比为81.08%。径向锯切模式的平均生产成本更低，二者差值为22.89 R$/m³，但两种锯切模式间并无显著差异。