Articoli correlati a Extruder Principles and Operations
Sinossi
This book is intended to fill a gap between the theoretical studies and the practical experience of the processor in the extrusion of thermoplastic polymers. The former have provided a basis for numerical design of extruders and their components, but generally give scant attention to the practical performance, especially to the conflict between production rate and product quality. In practice extruders are frequently purchased to perform a range of duties; even so, the operator may have to use a machine designed for another purpose and not necessarily suitable for the polymer, process or product in hand. The operator's experience enables him to make good product in unpromising circumstances, but a large number of variables and interactions often give apparently contradictory results. The hope is that this book will provide a logical background, based on both theory and experience, which will help the industrial processor to obtain the best performance from his equipment, to recognize its limitations, and to face new problems with confidence. Mathematics is used only to the extent that it clarifies effects which cannot easily be expressed in words; ifit is passed over, at least a qualitative understanding should remain. The approximate theory will not satisfy the purist, but this seems to the authors less important than a clear representation of the physical mechanisms on which so much of the polymer processing industry depends. M. J. STEVENS J. A.
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Contenuti
Introduction. Practical extrusion processes and their requirements. Flow behaviour relevant to extrusion. Thermal and energy properties in processing. Extrusion dies. Principles of melt flow in single-screw extruders. Solids conveying and melting in single-screw extruders. Principles of energy balance. Operation of single-screw extruders. Twin-screw extruders. Extruder operation as part of a total process. Practical extruder operation. Application to the individual machine. Appendices. References. Index.
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Book by Stevens MJ Covas JA
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Condizione: New. Dieser Artikel ist ein Print on Demand Artikel und wird nach Ihrer Bestellung fuer Sie gedruckt. This book is intended to fill a gap between the theoretical studies and the practical experience of the processor in the extrusion of thermoplastic polymers. The former have provided a basis for numerical design of extruders and their components, but genera. Codice articolo 5915088
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Hardcover. Condizione: new. Hardcover. This text is concerned with melt processing of thermoplastics and rubbers by means of the screw extruder. It is intended to bridge the gap between the theoretical performance of equipment primarily concerned with numerical design and the practical experience of the operator. Theoretical discussions generally give scant attention to practical aspects such as the conflict between productivity and product quality. The book opens with a description of the processes based on melt extrusions, with an emphasis on their differing requirements from the extruder, followed by a summary of flow and thermal properties relevant to extrusion. The principles of output and energy balance are then developed in a simplified form which is sufficiently accurate for most operational purposes, whilst retaining algebraic equations from which the effects of operational changes can be seen. The overall performance of the single-screw extruder is studied in terms of the separate effects of each controlled variable, the polymer properties and the screw design, followed by a tabulation of the various operational strategies to obtain a desired effect.The principles of operating twin-screw extruders are also examined in relation to screw geometry, and considerations of stability and product quality are followed by suggested control limits for specific processes. Practical information is given on start-up trials, scale-up, product changing, dismantling and cleaning. This book should be of interest to production/development technologists and engineers, quality control managers, plant design engineers, research technologists in plastics and rubber processing companies, and lecturers, researchers and postgraduates in materials processing in universities and technical colleges. This book is intended to bridge the gap between the theoretical performance of equipment primarily concerned with numerical design, and the practical experience of the operator. Shipping may be from multiple locations in the US or from the UK, depending on stock availability. Codice articolo 9780412635908
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