Valorização do bagaço de cana-de-açúcar na produção de painéis aglomerados de baixa densidade

Abstract

It’s necessary to diversify the reconstituted panels sector by introducing lignocellulosic wastes in the production process. In addition to adding value to wastes materials, this may contribute to the increase the industrial production of panels eliminating the need of new forest plantations. The aim of this study was to evaluate the physical and the mechanical properties of low density particleboards produced with different amounts of sugarcane bagasse and Eucalyptus grandis wood. The panels were produced with 10% of urea formaldehyde adhesive (based on dry weight of particles). The pressing cycle consisted by: pre-pressing of 0.5 MPa during 10 minutes followed by pressing of 4.0 MPa and temperature at 160°C for 15 minutes. The following percentages of wastes were used: 0, 20, 40 and 60% in association to eucalypt wood. For the evaluation of the quality of the panels, physical and mechanical tests were performed. The experiment was carried out according a completely randomized design with three replications. For data analysis, simple linear regression was used. It was verified that the water absorption was not affected by the insertion of sugarcane bagasse in the panels, while for thickness swelling, the increase of the proportion of the waste resulted in an increase of this property. The mechanical properties were negatively affected by the inclusion of sugarcane bagasse. The panels produced with sugarcane bagasse and wood did not reach the standard CS 236-66 for modulus of elasticity at static bending. The results showed that 26% of sugarcane bagasse could be added for production of particleboards associated to eucalypt wood