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Article | REF: AM3650 V1

Extrusion - Single-screw extrusion (part 1)

Authors: Bruno VERGNES, Stéphan PUISSANT

Publication date: October 10, 2002, Review date: January 10, 2019

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2. Mechanisms and modeling

2.1 Solid conveying zone

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2.1.1 Solid conveying mechanism

In the feed zone, the rheological behavior of the polymer, whether granulated or powdered, is similar to that of "sand", with a certain cohesion and angle of internal friction. In fact, experience shows that it is rapidly compacted by pressure and temperature, and then behaves like an almost indeformable, helical-shaped solid, sliding in the space between the screw and the sleeve. In fact, it is the forces of friction between the polymer, the sleeve and the...

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