Abstract
This study aimed to evaluate the shear strength of bonded wood joints of Eucalyptus camaldulensis and Eucalyptus urophylla with vinyl polyacetate (PVA) and isocianate polymeric emulsion (EPI) adhesives with the amount of glue of 150 and 180 g/m². The specimens were submitted to shear tests in dry and wet conditions, based on the procedure described in standard EN 13354 (2008). The results of the 5th lower percentile were compared with the requirements of EN 13353 (2008). Among the studied species, Eucalyptus camaldulensis showed better glue line shear strength when compared to Eucalyptus urophylla. However, both species are potentially viable for the edge glued panel (EGP) production, since they meet the minimum requirement of 2.5 MPa, referring to the 5th lower percentile, as established by EN 13353-2008 standard. Based on the results, it is recommended the use of EPI adhesive with the amount of glue of 150 g/m² for the bonding of the wood of these species, aiming at the production of EGP.
Highlights
IntroductionThe planted forests of Eucalyptus in Brazil comprise an area of 5.6 million hectares, being several species already used commercially for the production of cellulose and paper, charcoal, particleboard and fiberboard (ABRAF, 2013)
The planted forests of Eucalyptus in Brazil comprise an area of 5.6 million hectares, being several species already used commercially for the production of cellulose and paper, charcoal, particleboard and fiberboard (ABRAF, 2013).Among the less used species in commercial plantations, Eucalyptus camaldulensis and Eucalyptus urophylla, deserve special attention due to their silvicultural potential and the good characteristics of their wood
Boland et al (2006) describe the wood of E. camaldulensis as high density, and according to physiscist-mechanical properties, it is used in heavy construction, railway ties, floors, structural beams, fences, turned wood, in the production of firewood and coal, and in the manufacture of plywood
Summary
The planted forests of Eucalyptus in Brazil comprise an area of 5.6 million hectares, being several species already used commercially for the production of cellulose and paper, charcoal, particleboard and fiberboard (ABRAF, 2013). Among the less used species in commercial plantations, Eucalyptus camaldulensis and Eucalyptus urophylla, deserve special attention due to their silvicultural potential and the good characteristics of their wood. The Eucalyptus urophylla is a species that presents great growth potential in terms of planted area due to the good productivity and quality of its wood. It presents an average basic density of 0.56 g/cm, with possibilities of use for the most diverse purposes, such as cellulose and paper, hard plates, sawmills and charcoal (JUNIOR and GARCIA, 2004)
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