Desenvolvimento de painéis aglomerados de papel kraft proveniente de embalagens descartadas de cimento

Abstract

The present study aimed to develop and evaluate lignocellulosic fibers and lignocellulosic particles panels by recycling discarded cement kraft packages as an alternative to the fibers traditionally used in the manufacture of MDF and MDP. Four different treatments were used, varying the urea-formaldehyde resin content by 15% and 30%, and the mass of particulate paper and fibers (F15, F30, P15 and P30). Physical and mechanical tests were performed according to NBR 14810-2: 2013 and NBR 15316-2: 2014. This Kraft paper presented similar behavior to that of some alternative fibers already used in these panels. Regarding its density, the composite was classified as High Density. In what concern Moisture Content and Thickness Swell for 24h, the samples of all the treatments fit the uses in dry conditions. The behavior presented for the Tension Perpendicular to Surface (Internal Bond) test did not comply with the parameters of the standards, with the fiber samples and the 15% resin content being the best result. The Static Bending test from their respective Modulus of Elasticity - MOE and Modulus of Rupture - MOR highlighted the particleboard panels, P15 and P30, whose average values reached 465.5 MPa (MOE), 16.3 MPa (MOR), 1299.8 MPa (MOE) and 24.9 MPa (MOR). In general, the raw material of the discarded cement packaging made of Kraft paper presented itself as a very promising option for civil construction panels. Some corrections on the methods of extraction and treatment of the raw material are expected, as well as in the processing of the panels. This may show improvement in the resulting mean values.