Desempenho físico-mecânico de painéis fabricados com bambu (Bambusa vulgaris Schr.) em combinação com madeira

Abstract

Considering the importance of derived products from bamboo for some countries and the wood shortage in some areas of Brazil, this work analyzed the quality of boards composed by particles of Eucalyptus sp. and bamboo strips (Bambusa vulgaris Schr.). The panels were produced with a density of 0.60 g/cm³ and 10% of urea-formaldehyde adhesive. The influence of the epidermis on the properties of the panels was also evaluated. The panels were constituted by five layers: core (Eucalyptus sp. or bamboo particles), layers of reinforcement (bamboo strips) and finish faces (particles of same nature as the core). The press time was 8 minutes, at 120ºC. None of the treatments satisfied the quality patterns established by A208.1 (ANSI, 1987) and DIN 68761 (1)-1961, (3)-1971 (GERMAN STANDARDS COMMITTEE, 1971) codes. However, particleboards produced exclusively by bamboo or combined with wood presented a similar behavior to those produced exclusively of wood, showing to be a viable alternative. The modulus of rupture (MOR) and elasticity (MOE) were approximately the same in all treatments due to the irregular distribution of the layers in the mattress. The absence of epidermis tended to reduce the thickness swelling (2 and 24 hours) and internal bond strength, however, without significant statistical difference. Therefore, other parameters of production of boards using bamboo, such as density and adhesive content, should be investigated in order to check whether the removal of epidermis is a really advantageous procedure.