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3. Origin of extrusion defects
3.1 Study of extrusion defects
Readers are invited to consult the article Rheological properties of thermoplastics. in the same treatise, in particular paragraph 2.2.3.
Capillary rheometers (commonly used in industry, this device enables flow curves to be obtained over a wide range of velocity gradients ) are simplified extruders that enable extrusion faults to be studied systematically. The complexity of industrial extrusion processes is thus reduced to a well-mastered and modeled experimental set-up.
The main assumptions of this model are :
a fully developed and isothermal steady shear flow;
negligible transient effects...
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Origin of extrusion defects
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References
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Akro-co Twin Screw Temarex (USA) http://www.temarex.com/extrus.htm
Extrud7-2000 Scientific Process & Research (USA) http://www.spar.com
Ludovic SCC (France) http://www.scconsultants.com
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ANTEC (SPE Annual Technical Conference) http://www.4spe.org
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Single-screw extruders
AKMA (Germany) http://www.akma-kg.de
AMUT (Italy) http://www.amut.it
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