Single Screw Extruder
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Development of extruded profiles from high density polyethylene and wood flour composites / Desenvolvimento de perfis extrudados de compósitos de polietileno de alta densidade com farinha de madeira
Polymer profiles extrusion shows some peculiarity due to the flow behavior of these materials during the processing. On the other hand, the profile die design and tooling has been more a result of professionals expertise than an engineering project in essence. In the present work, it was aimed to combining concepts of computers aided engineering to rheologic
Publicado em: 2009
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14. Preparation of organoclays appropriated and development of plasticized pvc nanocomposites / Preparação de argilas organofílicas para o desenvolvimento de nanocompósitos a partir de compostos de PVC plastificado
Nanocomposites of Plasticized PVC with organoclays have a large potential to improve the thermal resistance of PVC as well as its flame retardancy. However, a great problem in the production of PVC nanocomposites is the decomposition of conventional organic ammonium salts incorporated on the clay which can catalyze PVC degradation and lead to deterioration o
Publicado em: 2009
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15. Modificação do LLDPE através de silanos viabilizando a aplicação em camadas plásticas de linhas flexíveis / Study of silane grafting reactions of low density polyethylene for pipe applications
The flexible lines are flexible structures manufactured through plastic and steel layers that allows its use in order to permit fluid flow in exploration and production of hydrocarbon between offshore oil units and sea bed and/or coast. Nowadays these pipes are one of the main ways to permit the exploration of hydrocarbon in deepwater. The present study aims
Publicado em: 2009
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16. Aptidão tecnológica do bagaço de maçã para aplicação em produtos extrusados e panificados / Aptidão tecnológica do bagaço de maçã para aplicação em produtos extrusados e panificados
The processing of apples for the extraction of juice gives origin to a solid residue called apple pomace. This material contains a great amount of fibers, which makes it a good ingredient for the nutritional enrichment of various edible products, mainly because of its positive effects in the prevention or treatment of some diseases, mainly, for its metabolic
Publicado em: 2009
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17. Properties of SBS and sisal fiber composites: ecological material for shoe manufacturing
The worldwide trend toward using cheap, atoxic and durable materials from renewable resources contributes to sustainable development. Thus, the investigation of the potential use of vegetal fibers as reinforcing agent in polymeric composites has gained new significance. Sisal fiber has emerged as a reinforcing material for polymers used in automobile, footwe
Materials Research. Publicado em: 2008-12
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18. Efeito da extrusão termoplástica nas características físico-químicas e nutricionais do rúmen bovino e sua aplicação na alimentação humana / Thermoplastic extrusion effects on physical-chemical and nutritional properties of bovine rumen and its application in human feed.
Introduction. Bovine rumen is a slaughterhouse by-product rejected by sensorial and cultural reasons. Nevertheless, it is a great proteic source and its utilization in human feed is necessary. Objective. Development of a product made with bovine rumen, analyzing its physical-chemical and nutritive characteristics and its use in human feed. Methodology. Bovin
Publicado em: 2008
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19. Processamento de compósitos de poli (tereftalato de etileno) reciclado reforçado com fibras de vidro
In this work, flake and post-condensed PET composites of different glass fiber contents (0, 20, 30 and 40%) were prepared. Tow kinds of fibers were employed: one fiber having an amino silane-based surface treatment and another one having an epoxi silane-based surface treatment. The composites were extruded in a single-screw extruder with a barrier double-fli
Publicado em: 2007
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20. Compatibilizing effect of post-consumer high density polyethylene in blends with polyamide-6 / Efeito compatibilizante do polietileno de alta densidade pos-consumo em blendas com poliamida-6
Polymer blends are commonly immiscible, due to the small entropy of mixture, and incompatible, caused by the absence of intermolecular interactions between the phases, resulting in poor mechanical properties. The addition of block or graft copolymers is an alternative way to improve the adhesion at the interface and to reduce the interfacial tension. In this
Publicado em: 2007
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21. Desenvolvimento e avaliação de filme biodegradável de polietileno incorporado de amido de grão-de-bico (Cicer arietinum L.) / Development and evaluation of biodegradable film of polyethylene incorporated with chickpea starch (Cicer arietinum L.)
The concern with the pollution caused by the great volume of waste plastics in the environment has led to the study of new biodegradable materials. The starch is one of natural polymers with greater potential of application in the development of biodegradable packaging, which is renewable and can be obtained from much variety of crops at low cost. Chickpea i
Publicado em: 2007
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22. Development and acceptance of amaranth-based breakfast cereal and cereal bars (Amaranthus cruentus L.) / Desenvolvimento e avaliação da aceitação de cereais matinais e barras de cereais à base de amaranto (Amaranthus cruentus L.)
Amaranth is a pseudocereal of great nutritional value that exhibits amounts of fiber and protein higher than the usually consumed cereals. The agronomic characteristics and the possibility of utilization of the entire plant drew sufficient interest among plant breeders to produce this grain in Brazil. Objective: To develop amaranth-based breakfast cereals an
Publicado em: 2006
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23. Syindiotactic polypropylene/EPDM blends, influence of processing and of thermal history in the physical and mechanical properties / Blendas de polipropileno sindiotatico com EPDM : influencia do processamento e da historia termica nas propriedades fisicas e mecanicas
The sPP containing 30 % of racemic pentads is a semicrystalline polymer presenting different crystalline polymorphs which depend on the thermo-mechanical history. Under heating sPP can recrystallize in a more perfect and thermodynamically stable form. The polymorphs differ in the density and also in the lamella thickness. The insertion of defects in the crys
Publicado em: 2005
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24. Estudo das propriedades termomecanicas e morfologicas de blendas biodegradaveis de poli (epsilon-caprolactona) (PCL) com amido de milho natural e modificado, plastificada com alquil epoxi estearato, com e sem po de fibra de coco / Study of the thermo-mechanical and morphological properties of biodegradable blends based on poly (epsilon-caprolactone)/corn starch plasticized with alquil-epoxy sterate, with and without coconut powder fiber
The mechanical properties of PCL (Polycaprolactone) blend with natural and modified starch (Adipic acid derivative), in the presence of a plasticizer like Alquil Epoxi Stearate, a totally biodegradable product, were studied in this dissertation. The necessity to develop biodegradable polymeric compositions with good mechanical properties, but with competitiv
Publicado em: 2005