Effect of Battens Edge Bonding in the Properties of Blockboards Produced with Pinus sp. Recycled from Construction Sites

Abstract

The construction is an activity that generates large amounts of waste, demanding alternative reuse. Wood-based waste can be processed and used for the production of forest products, such as blockboards type plywood. This study evaluated the physical and mechanical properties of blockboards produced with wood from construction wastes, comparing the core bonded and without bonding the strips, in order to determine which production method shows better results as well as observe the phenol-formaldehyde adhesive properties in the panels. The production of blackboard as well as testing was made at the Forest Products Laboratory-LPF, Brazilian Forest Service - SFB. The wood wastes used were obtained in construction sites at the University of Brasilia-UnB, and the species used was Pinus sp. for the battens and Currupixá (Micropholis venulosa) for the face veneers. The adhesive used was phenol-formaldehyde (Cascophen HL-7090 HS). The panels were produced with dimensions 560 x 340 mm x 15 mm. The physical properties of the panels were assessed: moisture content (MC); apparent density (MEA); water absorption (AA); and recovery in thickness (RE) and swelling plus recovery in thickness (IR). The mechanical properties of the panels were evaluated: static bending (MOR and MOE); and shear strength in the glue line (RLC). In view of the source of the material used, the results were satisfactory for both treatments.