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• W1998929462 abstract "Screw design for single screw extruders is a subject often surrounded by a certain degree of mysticism; in fact, by many people it is considered to be a black art. Others approach screw design from a mathematical point of view and determine the screw geometry from mathematical simulation of the extrusion process. Neither approach works very well. Our understanding of the extrusion process has improved considerably over the last 40 years. As a result, screw design certainly cannot and should not be considered a black art, because doing so would basically ignore all the progress made in the development of improved understanding of the extrusion process. On the other hand, relying only on mathematical modeling to achieve the desired extruder performance is not entirely appropriate, simply because the extrusion theory has not developed to the point that extruder performances can be predicted with 100 percent accuracy. The correct way to approach screw design is to combine extrusion theory and practical experience. As long as the extrusion theory is not fully developed, there is no substitute for practical experience. In this paper a practical approach to screw design is developed, with a minimal use of extrusion theory, to facilitate wider implementation of this approach. The design of the solids conveying, plasticating, melt conveying, and mixing zones of the extruder will be described based on a discussion on what physically happens to the material as it progresses along the extruder screw. It will be shown that the appropriate screw design is strongly dependent on the flow properties of the material to be extruded as well as the amount of pressure that has to be developed by the screw. This means that the screw design cannot be analyzed without consideration of the die that will be used at the end of the extruder. The design of the die, the melt flow properties of the polymer, the throughput rate, the melt temperatures, and the screen pack determine the amount of pressure that has to be developed by the screw. Therefore, the screw design that is appropriate in a regular extrusion operation is usually not optimum when a melt pump is used, because in the latter case the screw only has to develop a small amount of pressure." @default.
• W1998929462 created "2016-06-24" @default.
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• W1998929462 date "1989-01-01" @default.
• W1998929462 modified "2023-09-25" @default.
• W1998929462 title "The ABC's of extruder screw design" @default.
• W1998929462 doi "https://doi.org/10.1002/adv.1989.060090404" @default.
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