Abstract
AbstractThis study was developed to evaluate the quality of plywood produced from Melia azedarach in combination with Pinus taeda, glued with urea-formaldehyde resin (UF) and phenol formaldehyde (PF). Panels were produced using five veneers of Melia azedarach only, five veneers of Pinus taeda and also with faces made of Melia azedarach and core with Pinus taeda. The panels were evaluated by glue line shear tests and by static bending in parallel and perpendicular directions. The higher contents of extractives in Melia azedarach wood did not reduce the glue line shear strength between the layers. For both UF and PF glues, panels produced with veneers of Melia azedarach showed better results on static bending and glue line shear tests. The results indicate great potential of Melia azedarach wood in plywood production, both for internal use (UF), and for external use (PF).Keywords: Cinamomo; wood veneer; glue line. ResumoQualidade de painéis compensados de Melia azedarach em combinação com Pinus taeda produzidos com resina uréia-formaldeído e fenol-formaldeído. O objetivo deste trabalho foi avaliar a qualidade de painéis compensados de Melia azedarach em combinação com Pinus taeda, produzidos com resina ureia-formaldeído (UF) e fenol-formaldeído (FF). Foram produzidos painéis com todas as cinco lâminas de Melia azedarach e de Pinus taeda, e capas de Melia azedarach e miolo de Pinus taeda. Os painéis foram avaliados por meio de ensaios de cisalhamento da linha de cola e flexão estática paralela e perpendicular. Maiores teores de extrativos presentes na madeira de Melia azedarach não prejudicaram a resistência da linha de cola entre as lâminas. Tanto para a colagem uréica, quanto para a fenólica, os painéis produzidos com lâminas de Melia azedarach apresentaram melhores resultados nos ensaios de flexão estática e de cisalhamento da linha de cola. Os resultados obtidos indicam grande potencial da madeira de Melia azedarach para produção de painéis compensados, tanto para uso interior (UF), quanto para uso exterior (FF).Palavras-chave: Cinamomo; lâminas de madeira; linha de cola.
Highlights
Several studies have been performed in Brazil on fast growing forest species that are used for the production of wood veneers and plywood, with the intention to increase the range of species as alternatives to Pinus, which is the main raw material used by plywood industries
Considering the importance of studies on rapid growth species coming from planted forests for the production of veneers and plywood, this study aimed to evaluate the possibility to use Melia azedarach wood, combined with Pinus taeda wood, for the production of plywood glued with ureaformaldehyde and phenol-formaldehyde resins
With regard to the chemical and physical properties, Melia azedarach presented mean values of the extractive components soluble in cold water, in NaOH, total extractives and pH that were statistically higher when compared to the values of Pinus taeda
Summary
Several studies have been performed in Brazil on fast growing forest species that are used for the production of wood veneers and plywood, with the intention to increase the range of species as alternatives to Pinus, which is the main raw material used by plywood industries. Besides the species belonging to the genus Eucalyptus, various researchers studied the behavior of other species, suitable for veneers and plywood production. Melia azedarach L. is a medium sized species and belongs to the Meliaceae family. Melia azedarach L. presents high edapho-climatic adaptation capability and a good wood quality which justifies the high investments for the production of raw material to supply the furniture industry, small carpenter shops and the small private use of families in rural areas (TRIANOSKI, 2010). Wood characteristics of Melia azedarach are similar to Cedar, both plants are known for producing an excellent quality wood and for presenting a similar chemical composition (MARTINEZ, 2002)
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