ULTRAVIOLET RAY AGING EFFECT ON LATHE CHECK SURFACE PROPAGATION IN Eucalyptus nitens PLYWOOD

Andrés Acevedo, Cecilia Bustos, Jean Pierre Lasserre, William Gacitua

Abstract


The objective of this study was to evaluate the effect of accelerated aging with UV rays andcontrolled environmental conditions in lathe check propagation and surface cheking, simulating theconditions of outside service of plywood made with veneers from three heights of logs familiessegregated of Eucalyptus nitens and under conditions of controlled peeling process. To perform thetest using an accelerated aging chamber UV (ultraviolet rays) can reproduce the spectrum of radiationemitted by the sun under controlled climatic conditions of relative humidity, condensation andtemperature according to ASTM G154-06. By image analysis assessed the level of surface checkingin the area percentage of the specimens aged in addition to the width of checks on the plywoodsurface. Image analysis of the aging of the specimen area showed that the width and area checksdecreases with respect to the height of the log, showing significant differences in checking betweensegregated families of Eucalyptus nitens.

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