PRODUCTION OF PLYWOOD PANEL FOR EXTERIOR USE WITH PARICÁ AND EMBAÚBA TIMBERS

Abstract

ABSTRACT This research objective was to evaluate the technical feasibility of using Schizolobium amazonicum Huber ex Ducke (Paricá) and Cecropia palmata Willd (Embaúba) timbers for the production of veneers and external plywood using two types of adhesives: phenol-formaldehyde and tannin-formaldehyde, and different veneer compositions. The trees were harvested in a planted forest area from gap enrichment in the municipality of Dom Eliseu, Pará state. The Pinus elliottii timber was used as the reference and was donated by a company located in the municipality of Irati, Paraná state. The panels were produced with pure timber of the three species, and two combinations between the paricá and embaúba species, using a resin weight of 145 g m 2 in single line. The veneers yield for the paricá was 80.03% and that of the embaúba 46.37%; The panels produced with pure embaúba timber, or in combination with paricá timber, and bonded with phenol-formaldehyde, presented satisfactory technological properties for external use and were the compositions that presented better properties. The best adhesive for the panels was phenol-formaldehyde, as the tannin-formaldehyde did not present good performance in the weight used in this study.

Keywords

• Tannin-formaldehyde
• Phenol-formaldehyde
• Veneers