Íngrid Luz Guimarães
Abstract:
Soybean pre-cleaning residue is found in large quantities in the farmyard of the beneficiation industries and on the farm dryers, causing serious inconvenience if not removed further away before the fermentation process begins. Among the residues generated at the time of harvest and cleaning of the grains are soybean pods, which is an alternative lignocellulosic material to be used in the production of MDP chipboard. The objective of this work was to verify the effect of soybean pods use on eucalyptus MDP panels production. The panels, with nominal density of 0.70 g/cm³, consisted of three layers, so that 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 ratios of soybean residue particles to those of eucalyptus in the kernel were 0, 25, 50, 75 and 100%. For the sizing of the particles the formaldehyde urea adhesive was used, in the proportion of 12%, for both the layers 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 were determined; compression ratio; water absorption and thickness swelling in 2 and 24 hours of immersion; perpendicular traction; modulus of elasticity and modulus of rupture in static flexion. To meet the requirements of the Brazilian standard (NBR 14.810/2002), for the thickness swelling properties (2h) and rupture modulus, the maximum amount of recommended soybean pod for MDP panels is 20%.
