Potencial da madeira de cedro australiano (toona ciliata m. roem var. australis) na manufatura de produtos de maior valor agregado

Abstract

The objective of this work was to study the potential of 4 and 18 years old wood of Australian Cedar (Toona ciliata) for the production of plywood, OSB, particleboard and cement-wood panels. The woods from four different places were compared: Campo Belo, Cana Verde, Santo Antônio do Amparo and Marechal Floriano. Plywood panels containing 5 veneers were produced using phenol-formaldehyde adhesive with 320 g/cm² glue amount and pressure of 8 Kgf/cm², temperature of 150°C during 10 minutes. The OSB panels were produced using nominal density of 0,65 g/cm³, phenol formaldehyde at 9% and pressed in a hydraulic press at 40 Kg/cm², temperature of 180°C during 8 minutes. The particleboards of nominal density of 0,70 g/cm³ were manufactured with urea-formaldehyde adhesive at 9% and pressed in a hydraulic press at 40 Kg/cm², temperature of 160°C during 8 minutes. It was applied paraffin at 1,5% in OSB panels and particleboards. The cement-wood panels were manufactured using nominal density of 1,1 g/cm³ and pressure of 40 Kgf/cm² at room temperature during 10 minutes. The results of the physical-mechanical properties of the panels were submitted to the variance analysis at 5% of significance and the means were submitted to the multiple comparison test. About the plywoods, the wood density, age and extractive content presented great influence on their physical-mechanical properties. Therefore, the use of Australian Cedar wood, both juvenile and adult ones, would not be feasible for the structural plywood panels production. The 4 years old Australian Cedar wood would not be feasible for the OSB panels productions since they presented values bellow the ones established by norm. The results indicated that the Australian Cedar wood (Toona ciliata) may be used as an alternative raw material for the production of particleboards and cement-wood panels, regardless of location and age.