Numerical Simulation of Flow Processes in Extrusion Tools for Partly Cross Linked or Highly Filled Polymer Melts
The flow behaviour of partly cross linked or highly filled polymer melts will be described with a new heuristic flow law, which takes in to account the pseudo plastic flow behaviour in the regime of low and high shear rates. The CARPOW-formula is a combination of power law and Carreau formula. It maps the flow behaviour of partly cross linked or highly filled polymer melts in process relevant shear rate ranges in extrusion and injection mold tools. The design criteria of extrusion tools should be full filled regarding this flow behaviour. That leads, compared with common design criteria, to new modified design concepts in the case of partly cross linked or highly filled polymer melts. Two praxis relevant examples should demonstrate the procedure in the case of extrusion slit dies.
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