This paper describes the effect screw speed and material throughput have on the filled regions in front of restrictive elements on a Non-Intermeshing Twin-Screw Extruder (NITSE). Fill length, operating conditions, material properties, and the pressure over the cylinders are all measured and compared to a model of pressure buildup in the screw elements of a NITSE. Experiments are performed over a range of operating conditions in a clear barrel Φ0.8" NITSE. By determining the relationship between fill length and pressure across the cylinders, fill lengths can be predicted for a non-transparent barrel from geometric terms and material properties.
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