Pressure development in the melting zone of a single‐screw extruder

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Abstract
An analysis is given of the pressure generation mechanism in the tapered channel of a single‐screw extruder. It is shown that when increasing the throughput the pressure build‐up capacity of the melting zone tends to decrease. As a result, severe pressure drops may occur in the tapered sections. A relationship between the pressure profile and the melting mechanism (solid bed/melt pool configuration) is described in terms of the cross‐channel melt circulation.

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