Caracterização de painéis aglomerados produzidos com madeira de eucalipto e resíduos lignocelulósicos agroindustriais

Abstract

The present work had as objective to characterize particleboard made from eucalyptus wood in combination with waste from agricultural activity (carpel of macadamia nut, parchment coffee and papaya stalk), using as urea formaldehyde adhesives and binders tannin urea formaldehyde. Analysed the physical properties density, water absorption and swelling in thickness; the mechanical properties static bending strength, tensile perpendicular (internal link) and Janka hardness; and the emission of formaldehyde. The particleboards have been classified as mediumdensity. Despite the increase in the percentage of residues on composition of particleboard and replacing 10% of urea formaldehyde resin by tannic extract have promoted the reduction of the physical properties, the particleboard attended performance specifications for water absorption and swelling in thickness. The average values of mechanical properties perpendicular traction (internal link), and Janka hardness obtained for the studied wastes generally met quality standards, with the exception of bending property. The addition of 10% urea formaldehyde resin tannic extract reduced 22.5% the emission of free formaldehyde in the particleboard. The results indicate the potential for the use of lignocellulosic waste papaya stalk, carpel of macadamia nut and parchment coffee as a raw material for the manufacture of particleboard, which are not recommended when subjected to bending stresses.