Abstract
Mathematical models for the conveying of powder resins in single-screw extruders with smooth barrels are well known. It is the aim of this paper to define the range of operating conditions where these models can be adapted to single-screw extruders with grooved barrels. In order to calculate throughput and torque characteristics the relevant friction parameters and powder properties have been determined. Furthermore it has been clarified to what extent the friction forces in grooved barrels can be described by a coefficient of effective friction. The influence of dynamic bridge formations in grooved areas is discussed.
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