AVALIAÇÃO DA QUALIDADE DE PAINÉIS AGLOMERADOS PRODUZIDOS COM MADEIRA DESequoia sempervirens E Pinus taeda RESUMO: O objetivo do presente trabalho foi avaliar as propriedades físicas e mecânicas de painéis aglomerados produzidos a partir de partículas de madeira de Sequoia sempervirens e Pinus taeda com resina uréia-formaldeido (UF) em diferentes proporções de mistura das duas espécies, sendo 100%, 0%, 75%, 50% e 25% de partículas de sequoia, respectivamente. Foram avaliadas as propriedades de massa específica e razão de compactação dos painéis, absorção de água e inchamento em espessura após 24 horas de imersão, ligação interna e flexão estática (MOE e MOR). A baixa massa específica da madeira de sequoia elevou a razão de compactação dos painéis e contribuiu para melhorar as suas propriedades mecânicas e estabilidade dimensional. Os painéis produzidos com sequoia nas proporções de 100%, 75%, 50% e 25% em mistura com pinus, apresentaram melhores resultados de propriedades em relação aos painéis produzidos com 100% de pinus. Os resultados de MOE e MOR em flexão estática e ligação interna de todos os tratamentos avaliados atenderam aos requisitos mínimos da norma EN 312:2003. Os resultados demonstram que a Sequoia sempervirens apresenta grande potencial para produção de painéis aglomerados.Palavras-chave: partículas de madeira, resina ureia-formaldeído, mistura de espécies.
Palavras-chave: colorimetria, aglomerados crus, CIE-L*a*b*.
Outdoor Weathering Evaluation of Particleboards Manufactured from Sequoia sempervirens and Pinus taeda Wood
ABSTRACTThe aim of this work was to establish the effect of using different amounts of Sequoia sempervirens and Pinus taeda wood particles on the colorimetric properties of particleboard and to evaluate the color change after outdoor weathering for six months. The colorimetric properties were measure according to the CIE-L*a*b* 1976 system. The results indicated a direct relation between the proportion of Sequoia sempervirens wood particles used in the blend and the red pigment values (a*) and an indirect relation with the yellow pigment (b*). Thus the final color of a particleboard can be predicted by controlling the amount of particles from the different species used in particleboard production. However, natural weathering for 4 months is sufficient to decrease a* and b* values and eliminate the color difference between the particleboards.
This paper aims to address the export incentive mechanisms through a case study exploring the advantages of the Integrated Drawback system, in a wood flooring company. A study was conducted indicating the inputs entered into the Integrated Drawback system in Suspension mode for the laminate flooring production process. The procedures required to acquire inputs using Drawback were described and the taxes that will be suspended were described. This is an efficient public policy instrument to export incentive. The Drawback regime can be applied by any exporting company, provided that the acquired inputs are used in the manufacturing process. In addition, it shows that tax reform is important measure to increase Brazilian competitiveness in different sectors, including the wood sector.
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