Maderas. Ciencia y tecnología
versión ISSN 0718-221X
ACEVEDO, Andrés; BUSTOS, Cecilia; LASSERRE, Jean Pierre y GACITUA, William. Nose bar pressure effect in the lathe check morphology to Eucalyptus nitens veneers. Maderas, Cienc. tecnol. [online]. 2012, vol.14, n.3, pp. 289-301. Epub 23-Ago-2012. ISSN 0718-221X. doi: 10.4067/S0718-221X2012005000004.
The objective of this study was to evaluate the effect of three nose bar pressure (TC) in the morphology of the lathe checks in Eucalyptus nitens veneers for the manufacture of plywood. Dried veneers were obtained from a peeling process, 1.8 mm thick three nose bar pressure TC1= 0.5%, TC2andTC3= 3.5%= 5%, which were obtained by adjusting the pressure bar and peeling knife of Cremonala the in a plywood plant in southern Chile. Samples were obtained randomly from the three types of veneers processed. Photographs were taken in the veneer thickness for subsequent image processing. In the morphological analysis of the cracks was evaluated: length, area and frequency in the samples for the three nose bar pressure studied. Morphological analysis of images showed that a decrease in the length and depth of the lathe check, as well as the area, when the nose bar pressure increases. Significant differences were found between 0.5%and 5%levels of nose bar pressure. This implies that increasing the nose bar pressure, through a setting that involves a smaller distance between the pressure bar and peeling knife, you get better quality veneers, more rigid and with a reduction of surface cracking in the final plywood.
Palabras clave : Lathe checks; nose bar pressure; veneers; peeling process; Eucalyptus nitens.