Solid transportation in the feeding zone of intermeshing co-rotating twin-screw extruders |
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Authors: | A C -Y Wong T Liu F Zhu |
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Affiliation: | (1) Department of Industrial and Manufacturing Systems Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, China;(2) Department of Polymer Science and Engineering, Sichuan University, Chengdu, China;(3) Plastics Engineering Research Division, Beijing University of Chemical Technology, Beijing, China |
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Abstract: | A mathematical model was proposed for the characteristics of solid transportation in the feeding zone of an intermeshing co-rotating
twin screw extruder. The model was based on the observations made from a “transparent” extruder. The analysis considered optimal
solid conveyed with maximum throughput rate, i.e., when the upper and lower intermeshing zones, and the two sides of the screws
were all partially filled with solid resin to an extent that a slight increase in the solid filling would immediately cause
blocking of the solid transportation. Because of these starve-fed characteristics, the conventional approach for analysing
solid feeding used in single-screw extruders was inadequate for twin-screw extruders. This paper also suggests a solution
for the mathematical expressions describing the stress and velocity fields in the solid feeding zone of a twin-screw extruder.
Finally, the predicted values are compared with our experimental findings. |
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Keywords: | Twin-screw Extrusion Solid conveying Polymer processing |
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