Production of Joints Of Eucalyptus Sp. to Obtain Edge Glued Panels

Abstract

This research aimed at evaluating the quality of bonded joints of Eucalyptus wood by using different faces and adhesives to produce EGP (Edge Glued Panels). Glue line shear specimens were obtained from bonded joints glued with PVAc (Polyvinyl Acetate) and EPI (Emulsion Polymer Isocyanate) adhesives, using pieces oriented with tangential, radial and intermediary faces, as well as the combination between them. The specimens were submitted to two pretreatments in order to simulate the use of joints in dry and wet environments. For shear tests, 12 treatments were obtained. The results indicated that the use of tangential x tangential and tangential x intermediary bonding faces and EPI adhesive presented better glue line shear strength for EGP in dry and wet pretreatments, respectively. The joints bonded in the radial x radial direction presented statistically inferior values when compared to the other treatments.

Evaluation of the potential use of Amazonian palm species for the production of edge-glued panels

“…Furthermore, it is observed that in the bonding process, for each species or mixed joints, the highest strength was associated with the use of the EPI adhesive. These results corroborate other studies that also found superiority for EPI adhesive compared to PVA (França et al 2020; Bila et al 2021).…”

“…As for the adhesive factor, the results showed greater strength to shear stress when the side joints were bonded with EPI instead of PVA. This result was also found in the dry state in studies on bonded joints of wood from other species (França et al 2020; Bila et al 2021). This was probably due to the curing of the EPI adhesive occurring by the reaction of its isocyanate groups with the hydroxyl groups of the wood, promoting stronger chemical adhesion (França et al 2020).…”

“…This result was also found in the dry state in studies on bonded joints of wood from other species (França et al 2020; Bila et al 2021). This was probably due to the curing of the EPI adhesive occurring by the reaction of its isocyanate groups with the hydroxyl groups of the wood, promoting stronger chemical adhesion (França et al 2020). This is different from the curing process of the PVA adhesive, which occurs by evaporating the solvent (water) (Geddes 1989).…”

Potential for using tropical solid wood waste from the Amazon for the production of edge glued panels

“…For Eucalyptus sp. using EPI adhesive at a spreading rate of 180 g.m -2 ,França et al (2020) found a shear resistance of 12.77 MPa in the dry condition and 8.84 MPa in the wet condition. WhileIwakiri et al (2021) using the same adhesive and spreading rates for E. Cariniana domestica, 5.23 MPa for Copaifera paupera, and 4.31 MPa for Cedrelinga cateniformis in wet pre-treatment, using the same adhesive and spreading rates as in the present study.…”