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    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.
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    De la “Quesana” tradicional a un sistema modular de paneles aislantes de Totora
    (Catholic University of Colombia, 2024-01-01)
    La “Totora” es una fibra natural disponible en el lago Titicaca, al sur del Perú, y de uso tradicional entre las comunidades circundantes. Actualmente existe un importante excedente, por lo que anualmente se quema una gran cantidad de totorales. Este estudio plantea el uso y la estandarización de la totora como material aislante térmico y de baja energía incorporada, para extender su uso a edificaciones en la fría región altoandina. Se realizó la exploración en campo de esta fibra natural y de cómo la trabajan las comunidades del lago, a través del intercambio tecnológico con pobladores locales. A partir de esta experiencia, y a través de pruebas básicas en gabinete, se desarrolló el panel doble cruzado y modular de totora. La transmisión térmica del panel se comprobó con pruebas de laboratorio. Se construyó un prototipo de vivienda con cerramiento de paneles de totora y estructura de madera, monitoreando su desempeño constructivo y térmico por tres meses. El resultado térmico fue mejor que el de una cabaña tradicional alto-andina. El panel de totora propuesto mantuvo su forma, rigidez y características aislantes, demostrando su potencial como material constructivo natural y de bajo impacto ambiental en su procesamiento.