Extrusion is one of the most useful processes for making long rubber product profiles. The profile deforms while extruding due to die swell based on the geometry of the die, thermal and rheological properties of the material, and predominantly on the thermal and rheological boundary conditions. The die swell behavior of the polymer is a critical characteristic in processing operations such as extrusion and injection molding. There are different kinds of swelling during the extrusion process. One is a recoil mechanism due to the elastic nature, and the other is a reorientation of the velocity profile from die inlet to free surface outlet [1].
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