Avaliação da permeabilidade e sua influência sobre propriedades físicas e de colagem em painéis aglomerados

• Ano de defesa: 2010
• Autor(a) principal: Bufalino, Lina
• Orientador(a): Mendes, Lourival Marin
• Banca de defesa: Lima, José Tarcísio, Bortoletto Júnior, Geraldo
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: UNIVERSIDADE FEDERAL DE LAVRAS
• Programa de Pós-Graduação: DCF - Programa de Pós-graduação
• País: BRASIL
• Palavras-chave em Português: Bagaço de cana-de-açúcar; Absorção de água; Cisalhamento na linha de cola; Sugar cane bagasse; Water absorption; Glue line shear strength
• Área do conhecimento CNPq: CNPQ_NÃO_INFORMADO
• Link de acesso: https://repositorio.ufla.br/handle/1/2363

This work aimed to determine the permeability and evaluate its effect on physical and gluing properties of the following particleboards: sugar cane bagasse panels produced in laboratory using different processing variables, commercial sugar cane bagasse panels and commercial wood panels. The rotameter method with adaptations was used to obtain the permeability values, which means that the atmospheric air was used to determine the gas permeability of the panels. The glue line shear strength was obtained in panel samples glued together with PVA adhesive. The density and water absorption after 2 and 24 hours were determined according to American Society for Testing and Material - ASTM (1999). The experimental design was entirely randomized, made up of 13 treatments and 4 repetitions. The permeability means were adequately grouped to allow specific statistics contrasts. The linear correlations between permeability and the glue line shear strength and water absorption after 2 and 24 hours were verified. It was possible to conclude that: The mean permeability obtained for the panels was 5,62 cm³/cm*atm*s; it occurred a high variation between the permeability values of commercial particleboards; the permeability of particleboards may be affected by factors such as size of the particles in the surface and apparent density; in general, it was possible to observe that the type, content, position and combination of resins did not affect the permeability of laboratorial particleboards; the laboratorial particleboards exhibited decrease of glue line shear strength with permeability increase. The opposite condition was observed for commercial panels; for the laboratorial particleboards, increases in the permeability values caused higher water absorptions after 2 and 24 hours, while for commercial particleboard it was not possible to observe a clear influence of the permeability on water absorption.