CIÊNCIAS FLORESTAIS (FOREST SCIENCES)RESUMO: A madeira é responsável por mais de 40% do custo de produção de painéis aglomerados e uma das alternativas para atender a demanda da indústria e reduzir o custo de produção desses painéis é o aproveitamento dos resíduos agroindustriais. Nesse sentido, o objetivo deste trabalho foi avaliar o efeito da substituição da madeira por casquilho de soja nas propriedades físicas e mecânicas dos painéis. Os painéis foram produzidos com densidade nominal de 0,60 g cm -3 . Substituiu as porcentagens de 0, 25, 50, 75 e 100% de casca de soja em relação às partículas de eucalipto. As partículas foram encoladas com 12% do adesivo uréia-formaldeído. O ciclo de prensagem compreendeu uma pressão de 4,0 MPa e temperatura de 180 °C durante 15 minutos. Os resultados encontrados mostraram que os painéis aglomerados convencionais produzidos com resíduo de casquilho de soja apresentaram aumento de suas propriedades física e diminuição das mecânicas à medida que se aumentou a substituição da madeira por resíduo. Conclui-se que, do ponto de vista técnico, as propriedades físicas e mecânicas serão atendidas com a substituição máxima da madeira por resíduo de casquilho de soja na proporção de 28,9%.ABSTRACT: Wood accounts for more than 40% of the production cost of clad of aglomerates panels and to meet industry demand and reduces the production costs of panels, the use of agro-industrial waste is an alternative. In this sense, the objective of this work was to evaluate the effect of the substitution of wood by soybean hull on the physical and mechanical properties of the panels. The panels were produced with a nominal density of 0.60 g cm -3 . It replaced the percentages of 0, 25, 50, 75 and 100% of soybean hulls in relation to the eucalyptus particles. The particles were glued with 12% of the urea-formaldehyde. The pressing cycle comprised a pressure of 4.0 MPa and a temperature of 180 ° C for 15 minutes. The results showed that the conventional agglomerated panels produced with soybean residue showed an increase in their physical properties and a reduction of the mechanics as the replacement of the wood by residue was increased. It is concluded that, from the technical point of view, the physical and mechanical properties are met with a maximum substitution of the wood per soybean residue in the proportion of 28.9%.Aproveitamento do casquilho de soja para a produção de painéis aglomerados convencionais de baixa densidade Rev. Bras.
RESUMOO presente trabalho teve por objetivo determinar as características tecnológicas da madeira de Myracrodruon urundeuva, em diferentes classes diamétricas. Para isso, a proporção de cerne/alburno foi determinada e a densidade básica foi quantificada pela norma ABNT (11941:2003) e a retratibilidade pela norma ABNT (7190:1997). Os valores da porcentagem de cerne para as classes diamétricas variaram de 4,42 a 21,15%, ao passo que para o alburno variaram de 78,85 a 95,56%. A relação cerne/alburno não apresentou efeito das diferentes classes diamétricas. A porcentagem de cerne decresceu da base para o topo, enquanto a porcentagem de alburno aumentou ao longo da posição longitudinal. A relação cerne/alburno decresceu da base para o topo. Não houve diferença significativa da densidade básica entre as classes diamétrica. A densidade básica decresceu da base até a posição de 75% e, posteriormente, foi crescente até o topo. Para a retratibilidade linear, foram constatados menores valores para a classe diamétrica entre 25,9-32,9 cm. Quanto ao coeficiente anisotrópico, o mesmo foi estatisticamente igual entre as classes diamétrica. A madeira de Myracrodruon urundeuva pode ser classificada como fator de anisotropia normal. PALAVRAS-CHAVE: Cerne e alburno, Densidade básica, Retratibilidade. TECHNOLOGICAL CHARACTERIZATION OF WOOD Myracrodruon urundeuva IN DIFFERENT DIAMETER CLASSESABSTRACT This study aimed to determine the technical characteristics of Myracrodruon urundeuva wood in different diameter classes. For this, it was determined the heartwood/sapwood proportion and the basic density was quantified by the ABNT (11941: 2003) and the shrinkage by the ABNT (7190: 1997). The values for the percentage of core diameter classes ranged from 4.42 to 21.15%, while for the sapwood ranged from 78.85 to 95.56%. The heart/sapwood relationship did not effect on the different diameter classes. The percentage of core decreased from bottom to top, while the percentage of sapwood increased along the longitudinal position. The core relationship/sapwood decreased from bottom to top. There was no significant difference in specific gravity between the diametric classes. The basic density
The southwest region of Goiás is a major grain producer in the country, with emphasis on soybeans. It is protected by a pellicle grain into a legume. After its separation, the film is eventually discarded or used as animal feed. One alternative is the production of particleboards, considering lignocellulosic material, which could add value to this raw material. In this sense, the objective of this study was to evaluate the dimensional stability of particleboards produced with soybean residue, comparing them with eucalyptus panels. The particleboard was made with a nominal density of 0.55 g/cm3, and 12% of urea-formaldehyde adhesive were used, based on their content of resin solids and pressing cycle of 3.92 MPa, 180oC for 15 minutes. Three panels were produced by treating. The assessment of dimensional stability was made by measuring their density, water absorption and thickness swelling after immersion for 2 and 24 hours. Based on the results, it can be seen that, statistically, the panels had equal densities, an average value of 0.52 g/cm3. It is noted that the panels produced with a soy film had water absorption values of 2 to 24 hours, and thickness swelling in 24 hours, in comparison with the upper eucalyptus. For thickness swelling after 2 hours, no statistically significant difference between the tested materials was observed.
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