Now available exclusively through our website:
The Extrusion Process and Material Rheology
180 pages packed with extrusion knowhow
Second Edition
by Antonio Gumina
SAMP S.p.A., Sampsistemi Division, Extrusion Technology Centre
The Extrusion Process and Material Rheology” is a useful tool for those that want to get a deeper insight into plastic trans formation technology in that it presents the reader with both consolidated notions and new developments, supported by empirical and experimental evidence.
The extrusion process and the design of machinery and equipment cannot be detached from material rheology and an in-depth knowledge of plastics technology. The topics dealt with in the book range from the rheology of plastics to the extrusion process, from different types of extruder screws and barrels to the tool calculations to use for different polymers, and gives an insight into extrusion crosshead calculus. The material in process, the cable and its section at the crosshead inlet, the desired results, the type of process, line speed and other empirical factors all very much influence tool choice. Correctly sizing tube tools, for example, depends on what process is used and on the DDR and DRB values associated with a particular polymer. The DDR and DRB are closely linked to polymer elasticity, to its elongation percentage and to shear rate and shear stress during extrusion. This can also be interpreted as a relation between the speed with which material exits the tool set and the line speed, related then to end product diameter requirements. Tool sets must be well-suited to the polymer in process, to the type of cable to insulate or jacket and to the process itself (insulation, jacketing, filling, etc.) since they can bear tremendous influence on end product quality in terms of surface finish and physical and mechanical properties. Equally important, if not essential, are the notions behind mixing screws, barrier screws, mixed-conformation screws, simple compression screws and the new GA multimaterial screw, which are analysed mathematically in relation to market and customer manufacturing requirements.
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