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Item type:Publication, An experimental methodology to determine the parameters of the compression molding process of composite materials made of recycled thermoplastic and recovered wood(Universidade Federal do Rio de Janeiro, 2020-12-01)RESUMO El objetivo de esta investigación es determinar los parámetros del proceso de sinterizado de materiales compuestos plástico-madera (CPM) fabricados mediante moldeo por compresión y con mejores propiedades desde el punto de vista de ingeniería. La estructura de este artículo es, en sí misma, una propuesta de metodología experimental para obtener CPM a partir de partículas de termoplásticos reciclados y maderas recuperadas. Ésta incluye la caracterización de los materiales y pruebas de moldeo por compresión, para determinar en una primera etapa la temperatura y tiempo de sinterizado y, en una segunda, el contenido y tamaño de las partículas de madera. Empleando madera capirona recuperada (MCR) y polipropileno reciclado (PPR), se evalúan dichos parámetros mediante ensayos en muestras moldeadas. Para este caso, los parámetros hallados son: 50 min de permanencia en horno a 190 °C, 30% y 70% en volumen de MCR y PPR respectivamente y partículas de MCR de 0,98 mm a 1,90 mm de tamaño. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Rotational molding parameters of wood-plastic composite materials made of recycled high density polyethylene and wood particles(Elsevier, 2021-07-15)Recent investigations have demonstrated that it is possible to incorporate different natural fibers in the rotational molding process. In this perspective, the main of this work is to study the influence of rotational molding parameters on the sintering process of composite materials made of recycled high density polyethylene and wood particles. To achieve this, an experimental procedure of three molding stages was elaborated to make wood-plastic composite materials. At each stage, it was studied the effect of a certain molding parameter on mechanical properties, while the other parameters remain constant during the molding process. The composite materials made during each stage were tensile tested to identify which of them have suitable mechanical properties and to find the most convenient molding parameters for making them. Using a stereoscope, pictures of composite materials' morphologies were taken to study the degree of sintering and determine its influence on mechanical properties. Results show that there is a very close relationship among composite materials’ morphologies, degree of sintering, rotational molding parameters and mechanical properties. In addition, it has been found that composite materials that reached the most convenient properties have a tensile strength which decreases up to 17% and an elastic modulus which increases up to 16%, in regard to a material made of neat recycled polyethylene that was molded under the same conditions.