ANALYSIS OF THE TENDENCIES OF THE PRODUCTIVITY OF THE SYSTEMS OF SAWMILLS OF Eucalyptus globulus Labill IN THE VALLEY OF THE MANTARO

Abstract

The sawed wooden productivity of eucalyptus (Eucalyptus globulus Labill) in the sawmills of the valley of the Mantaro it has always varied among these, being prosperous and not very successful sawmills; these perceived differences have motivated to study with systemic approach the tendencies of the sawed wooden productivity.  Five sawmills of saw band and four of circular saws were studied. The used mensuration teams were: digital tachometer, clock comparator, digital chronometer and vernier. They were measured the chip thickness, court speed, feeding speed, step, sharp of the sawmills, ergonomic aspects and the productivity. The results of the analysis of the tendencies of the productivity are directly associated with the chip thickness, quality of sharp of their sawmills and the treatment to the operative personnel. The sawmill of band that reached the best level of productivity of 2,35 m²/minuto, generated a thickness of chip of 489 microns, with quality of sharp "good" and I try "to regulate" to the personnel; contrarily, the sawmill that reached the lowest level of productivity, generated a thickness of chip of 218 microns, with quality of sharp "faulty" and I try "faulty" to the personnel. The direct relationship between the productivity and the chip thickness is associated with the handling of the court speeds and of feeding of the wood (1); high court speeds generate smaller chip thickness, quick waste of the edges of the mountains, consequently low productivity. The opposing relationships could be used to readjust the handling of the machines and saw tools, to elevate the productivity and the profitability of the sawmills without using significant economic resources.