Evaluation of plywood quality manufactured with veneers of Schizolobium amazonicum

Abstract

This research was developed to evaluate the feasibility to use the veneers of Schizolobium amazonicum (paricá) for plywood manufacture. The plywood was manufactured with five veneers of 2.0 mm thickness, using urea-formaldehyde and phenol-formaldehyde resins with two different adhesive formulations and amount of glue spread. Were evaluated the properties of glue line shear strength (RLC) and static bending (MOE and MOR) parallel and perpendicular. The different adhesive formulations and amount of glue spread not affected significantly the results of glue line shear strength. The average values of RLC and percentage of wood failures of the Paricá plywood attends the requirements of EN 314-2 (EUROPEAN COMMITTEE FOR STANDARDIZATION (CEN), 1993). The results of MOE and MOR, parallel and perpendicular, obtained to Paricá plywood were lower than the commercial plywood of Pinus taeda. However, the lower density of Paricá plywood (0,32 to 0,37 g/cm³) in comparison to pinus plywood (0,53 g/cm³), not affected significantly to reduction of these properties. The results obtained in this research showed the feasibility of the use of veneer of Paricá for plywood manufacture.