Extrudate swell and extrusion pressure loss of polymer melts flowing through rectangular and trapezoidal dies

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Abstract
A theoretical and experimental study of pressure losses and extrudate swell of flow through dies with complex crosssections is presented. The range of utility of models based on one‐dimensional shearing on pressure loss‐extrusion rate behavior is indicated. A procedure to predict extrudate profiles emerging from complex dies is developed. This is based on consideration of the idea of unconstrained elastic recovery from long dies. The theoretical predictions are contrasted with experiments on polystyrene and polypropylene.