RESUMO: Plantios experimentais de Pinus palustris foram implantados no Brasil com a finalidade de identificar a região mais adequada para o desenvolvimento da espécie. No entanto, a aceitabilidade da madeira dessa espécie no mercado interno depende do conhecimento de suas propriedades básicas. Por isso, este trabalho teve como objetivo determinar algumas das propriedades físicas e mecânicas da madeira de P. palustris cultivado no sul do Brasil. Para tanto, foram extraídas amostras de dez árvores com 39 anos de idade para a realização dos ensaios. A densidade da madeira variou de 0,35 a 0,92 g.cm-3 nas condições básica e verde, respectivamente. As contrações tangencial e radial resultaram num coeficiente de retratibilidade de 1,85. Apesar da idade avançada, a resistência mecânica da madeira de P. palustris foi semelhante à de outras espécies do mesmo gênero. Conclui-se que a espécie apresenta madeira com propriedades que a tornam potencial para diversificação dos plantios comerciais da região sul brasileira.Palavras-chave: pinheiro de folha longa, resistência da madeira, estabilidade dimensional, qualidade da madeira
This work evaluated the potential of the species Pinus glabra for the production of laminated panels, as well as the effect of the density of the veneers and their combination on the quality of the product. The plywood and laminated veneer lumber were produced from two veneer density classes and the combination between them, namely: panels with veneers from 0.33 to 0.40 g/cm3; panels with veneers ranging from 0.41 to 0.48 g/cm3; and panels with veneers of 0.33-0.40 g/cm3 in the inner layer and 0.41-0.48 g/cm3 in the outer layer, resulting in 6 treatments. Phenol-formaldehyde was used as adhesive, whose formulation was 100 pbw of adhesive, 20 pbw of extender, 10 pbw of filler and 20 pbw of water, and applied at a grammage of 180 g/m². The pressing parameters were 1 MPa and temperature of 160ºC for 8 minutes. The evaluation of the quality of the panels was performed through tests of apparent specific gravity, static bending and glue line shear strength, according to European standards. The results presented that the production of panels, from the classification of veneers by densities and combination between them, provides gains in strength and stiffness. The parallel direction of the veneers (in LVL) provided gains in strength and stiffness when compared to panels produced with veneers perpendicular to each other (plywood), being, therefore, the most suitable for structural use. Finally, we have the conclusion that the species Pinus glabra has potential for producing laminated panels.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.