A NEW APPROACH TO SIMULATION OF DIE FLOW WHICH INCORPORATES THE EXTRUDER AND ROTATING SCREW TIPS IN THE ANALYSIS

The traditional method of mathematical modeling of the die flows treat s the die as a stand alone tool which is independent of the extrusion conditions which feed the polymer melt into the die. Here, we demonstr ate that especially under the conditions where a breaker plate is not used the flow and the deformation which occur in the die are dependent on the prevailing velocity and the stress conditions of the fluid at the extruder which feeds the die. A finite element method based techni que is used to solve the conservation equations using a mesh which cov ers both; the die and the rotating conical screw tips of the extruder. The presented methodologies provide a more realistic representation o f the thermo-mechanical history experienced by the polymer melt or str uctured fluids including emulsions or suspensions in the die and thus provide better tools for die design and process optimization. The resu lts also suggest that significant improvements in die design and hence die performance could ensue by using the geometry of the screw tips, the distance between the screw tips and the die and the rotational scr ew speed as additional parameters for design and optimization.