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Abstract

Profile die design for extruding rubbers has evolved to the point that three dimensional finite element analysis of the flid dynamics is possible, including inlet flow and extrudate swell. These computations are complicated and can involve trial and error when considering extrudate swell. A new method of profile (thin plate) die design is presented which involves a simple finite element computation to predict the die profile to produce an extrudate of prescribed shape: the inverse extrudate process. The method is referenced to an anology between plate deflection and low-Reynolds-number fluid flow. A reference extrudate swell is used to take care of the characteristics of the extruder, operatiing conditions, extrudate properties, and anology similarity parameters. Analysis for a power-law rubber is presented which predicts the die profile to produce a square extrudate, and a die profile for a tyre extrudate. Comparison of these cases with three-dimensional theory and actual experimental data for the tyre is good.

Keywords

extruder die design die swell rubber extrusions tyre extrusion finite element die design

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A profile die design method for a rubber extrudate using an analogy

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