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Mathematical modeling of melting of polymers in barrier-screw extruders

✍ Scribed by B. Elbirli; J. T. Lindt; S. R. Gottgetreu; S. M. Baba

Publisher
Society for Plastic Engineers
Year
1983
Tongue
English
Weight
749 KB
Volume
23
Category
Article
ISSN
0032-3888

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✦ Synopsis

Abstract

Some of today's modern screws contain melt‐separating secondary (barrier) flights in the transition zone. With increasing utilization of barrier screws, the availability of proper and accurate design methods for the melting zone remains of paramount importance. A modified version of a mathematical model developed by the authors previously is applied to two most common types of barrier screws, viz.

β€”The Mailefer screw (varying pitch and constant depth);

β€”The Barr screw (constant pitch and varying depth). The present analysis provides valuable insight into the operating principles of these screws. A comparative study is presented demonstrating the possible advantages and disadvantages of the Maillefer and Barr screws in relation to conventional compression screws.

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## Abstract A model for investigating the melting process of polymer in a vibration‐induced single‐screw (VISS) extruder is presented. The key feature of this model is as follows: vibration force field is introduced into the overall course of extrusion by the axial vibration of the screw, and the v