USE OF FIVE Eucalyptus species FOR PARTICLEBOARDS MANUFACTURE1

Abstract

-The objective of this study was to evaluate the technical feasibility of the use of five Eucalyptus species, originating from plantations with short rotation cycle, for particleboards manufacture. The following species have been studied: Eucalyptus benthamii, Eucalyptus dunni, Eucalyptus grandis, Eucalyptus saligna, Eucalyptus urograndis, their mixture and Pinus taeda as a control. 21 wood particleboard have been produced, with nominal density of 0.65 g/cm³, totaling 7 treatments. For the bonding, urea-formaldehyde resin was used, in the proportion of 8% of solids dry weight base of the particles, 2% of catalyst ammonium sulphate on weight of resin and 1% of paraffin. The Eucalyptus particleboards showed lower values of WA2h and WA24h than the particleboards produced with Pinus taeda. The particleboards composed Mix of species exhibited high dimensional stability similar to those produced with the pure Eucalyptus species. E. grandis showed values statistically higher of mechanical resistance (MOR and MOE) to those obtained by the other species studied, as well as, the Eucalyptus species were higher than the control species. In internal bond the particleboards produced with E. grandis was among the highest results of internal bond, being statistically similar to E. saligna. The species Mix particleboards exhibited proprieties in general similar to those produced with the pure Eucalyptus species. All species as well as the mix among them showed technical feasibility for particleboard manufacture.Keywords: Short rotation; Fast growing species; Agglomerated particles panels. UTILIZAÇÃO DE CINCO ESPÉCIES DE EUCALYPTUS PARA A PRODUÇÃO DE PAINÉIS AGLOMERADOSRESUMO -O objetivo deste estudo foi avaliar a viabilidade técnica da utilização de cinco espécies de Eucalyptus, provenientes de plantios com ciclo de curta rotação, para produção painéis aglomerados. Foram estudadas as espécies: Eucalyptus benthamii, Eucalyptus dunni, Eucalyptus grandis, Eucalyptus saligna, Eucalyptus urograndis, a mistura entre elas e o Pinus taeda como testemunha. Foram produzidos 21 painéis aglomerados, com massa específica nominal de 0,65 g/cm³, totalizando em 7 tratamentos. Para a colagem utilizou-se a resina ureia-formaldeído, na proporção de 8% de sólidos base peso seco das partículas, 2% de catalisador sulfato de amônio sobre peso da resina e 1% de parafina. Os painéis de Eucalyptus apresentaram menores valores de AA2h e AA24h do que os painéis produzidos com Pinus taeda. Os painéis compostos pelo Mix de espécies apresentaram estabilidade dimensional semelhante aos produzidos com as espécies de Eucalyptus puras. O E. grandis apresentou valores estatisticamente superiores de resistência mecânica (MOR e MOE) aos obtidos pelas demais espécies estudadas, assim como, as espécies de Eucalyptus foram superiores à espécie testemunha. Na tração perpendicular os painéis produzidos com E. grandis apresentou entre os maiores resultados de tração perpendicular, sendo estatisticamente semelhante ao E. saligna. Os painéis do Mix de espécies apre...

EVALUATIOM OF PHYSICAL AND MECHANICAL PROPERTIES OF PARTICLEBOARD PRODUCED FROM WOOD OF Cupressus torulosa IN MIXTURE WITH Pinus taeda

“…The results of perpendicular traction are in accordance with the results presented by Rosa et al (2017) or particleboards produced with five species of Eucalyptus (E. benthamii, E. dunnii, E. grandis, E. saligna, E. urograndis), ranging from 0.64 MPa 0.91 MPa. Trianoski et al (2013) and Iwakiri et al (2014), found for panels of Cryptomeria japonica and Sequoia sempervirens, perpendicular tensile values of 0.99 MPa and 0.70, respectively.…”

“…Regarding the 24-hour thick swelling, the results are compatible with some values presented in the literature. Rosa et al (2017) found for particleboards produced with five species of Eucalyptus (E. benthamii, E. dunnii, E. grandis, E. saligna, E. urograndis) 24-hour thick swelling values in the range of 10.74% to 11.76%. Trianoski et al (2011) found for Acrocarpus fraxinifolius, Melia azedarach, Grevillea robusta, Schizolobium parahyba and Toona ciliata, values in the range of 16.78% to 29.76%.…”

“…The average values of MOE were satisfactory compared to the results presented by some researchers for particleboards produced with species from forest plantations. Rosa et al (2017) found for particleboards produced with five species of Eucalyptus (E. benthamii, E. dunnii, E. grandis, E. saligna, E. urograndis) MOR values ranging from 2,111 MPa to 2,589 MPa. Trianoski et al (2011) found for panels of Acrocarpus fraxinifolius, Melia azedarach, Grevillea robusta, Schizolobium parahyba and Toona ciliata, values ranging from 1,475 MPa to 2,427 MPa.…”

“…The average values of MOR were satisfactory when compared to the results presented by some researchers for particleboards produced with species from forest plantations. Rosa et al (2017) FLORESTA, Curitiba, PR, v. 50, n. 3, p. 1478-1485. Iwakiri, S. et.al.…”

Engineering Wood Products from Eucalyptus spp.

“…Several studies have demonstrated the practicality of using Eucalyptus species in particleboard manufacture. Da Rosa et al [35] made particleboards from five eucalyptus species, i.e., Eucalyptus benthamii, E. dunni, E. grandis, E. saligna, and E. urograndis. As a control, particleboard produced from Pinus taeda was used.…”