Aproveitamento de resíduo de soja para produção de painéis MDP (Medium Density Particleboard)

Abstract

Soybean pre-cleaning residue is found in large quantities in the processing and processing dryers' farms, resulting in serious inconvenience if it is not removed to farther places before the fermentation process begins. Among the residues generated at the time of harvesting and cleaning of the grains are soybean pods, which presents as an alternative lignocellulosic material to be used in the production of Agglomerated panels of the MDP type. The objective of this work was to verify the effect of the use of soybean pods in the production of eucalyptus MDP panels. The panels, with a nominal density of 0.70 g / cm³, were composed of three layers, the thin layers of eucalyptus wood were used in the covers and the core was composed of a mixture of eucalyptus particles and soybean pods. The proportions used of soybean residue particles in relation to those of eucalyptus in the kernels were 0, 25, 50, 75 and 100%. For the glueing of the particles the adhesive urea formaldehyde, in the proportion of 12%, was used for both the covers and the crumb. The pressing cycle had a temperature of 160 ° C for a period of 15 minutes at a pressure of 4MPa. To evaluate the quality of the panels produced, their physical and mechanical properties of apparent density; Compaction ratio; Water absorption and swelling in thickness at 2 and 24 hours of immersion were determinater; Perpendicular traction; Modulus of elasticity and modulus of rupture in the static bending. To meet the requirements of Brazilian standard (NBR 14.810 / 2002), for the properties of swelling in thickness (2h) and modulus of rupture, the maximum amount of soybean recommended for MDP panels is 20%.