Navegando por Assunto "Polietileno"

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Acesso aberto (Open Access)
Estudo de reaproveitamento de filmes de polietileno para fabricação de colchões de ar comprimido para utilização em embalagens de produtos eletroeletrônicos
(Universidade Federal do Pará, 2011-02-28) OLIVEIRA, Macêdo Santos de; SOUZA, José Antônio da Silva; http://lattes.cnpq.br/6157348947425968
Films of polyethylene (PE) are commonly used in packaging of small products such as packaging for digital cameras, camcorders, wine bottles, medical instruments, etc... as a function of important properties such as mechanical strength (vibration, drop, etc..) thermal (temperature, humidity, pressure) with the ease of processing and a cost. In electronics packaging, are used PE films of low density, depending on the product being package. In this work, films were evaluated as lowdensity polyethylene used for packing display panels on the production line, consisting of a single polymer, replacing the packaging of expanded polystyrene (EPS) by a polyethylene cushion with air mattress inflated with changes in the thickness of the films were subjected to the fusion of two layers of training for air mattresses, under certain conditions of temperature and pressure, where expansion of the films resulted in significant changes in physical, mechanical. The films were characterized before and after welding for clothing of air mattresses in the format of columns of air that can be molded into packaging for consumer electronics. It was observed that change according to the type of material making up the films of polyethylene, that is, the more resistant to compression test, the greater the degree of impact absorption when this raw material in the form of inflated air mattress this means an excellent performance to bear the weight of a product during the mechanical test, such as drop test, vibration test, test temperature and humidity. Studies show that we can study and test films with high strength and are discarded and reprocessed in the factories for the manufacture of inflatable cushions to be used in various products. The reuse of these raw materials helps to reduce the rate of waste disposed in the environment.
Acesso aberto (Open Access)
Perfis de polietileno reciclado carregado com fibra de açaí
(Universidade Federal do Pará, 2012-05-19) BRITO, Paulo Roberto de Oliveira; DIAS, Carmen Gilda Barroso Tavares; http://lattes.cnpq.br/2113791118142177
Were obtained porous tubular profiles, polyethylene (PE) and polyethylene/fiber açai (PE/PA) 80/20 extruded from granulated particles of high-density polyethylene packaging recycled post-consumer 600 μm, and this with fiber açaí 300 μm. For parts processing was developed a mono-screw extruder bench, with System Mechanic powered by an electric motor of ½ HP (0.37 kw) controlled by a frequency inverter with cannons, bagels, array and replaceable heating system. To allow a preview of didactic equipment operating conditions so simplified were conducted tests with paraffin in glass ranging from Cannon-if the screw rotation speeds and temperature profile, adjusting mass flow and pressure in the output. For extrusion of profiles theological tests were conducted with porous of PE and PE/FA screw, barrel being selected and aluminum matrix; bagel with step 9 mm and length diameter ratio (L/D) 22, composed of an element mixer and a floating element in the zone of flow control; angle between the axis and thread screw 17 air gap between the screw and barrel 0.15 mm; 1.3 rpm rotation; heating along the cannon 120º C; tubular array with 21 mm internal diameter and Chuck 19 mm outside diameter. PE profiles and PE/FA showed average pore diameter 0.7 and 0.6 mm; specific gravity to water at a point 28º C 0.77 and 0.73; modulus GPa 1.002 and 2.601 and maximum apparent swelling of extruded 100 and 80%.