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The analysis and the simulation of fluid extruded out of a die opening are ofgreat importance in different industrial applications. Mathematical modelingand experimental studies of extrusion out of a constant die gap has been thesubject of numerous publications in the literature. Extrusion Blow Molding is apolymer forming technique used to manufacture a wide range of large hollowparts such as fuel tanks used in the automotive industry. The die gap is variedduring extrusion to adjust the manufactured product's final thickness and tocompensate for uneven stretching during molding. In this work, mathematicalmodeling of varying die gap extrusion is introduced. Two models using differentapproaches are presented to model the time dependent effects of varying the diegap on the extrudate. In the first approach, physics based partial differentialequations are used to simulate extrusion. The Navier Stokes equations are usedas governing equations to simulate molten polymers. The governing equations aresolved using Arbitrary Lagrangian Eulerian based Finite Element Method. A novelnumerical method for defining the free surface of the extrudate is proposed. Inaddition, the effects of varying the die gap on the material velocity, pressureand extrudate shape are reported. In the second approach, a parameteridentification scheme is used to obtain the parameters of a novel model with apredefined structure. The purpose of the proposed model is to replicate timedependent extrudate thickness of the physics based model.

Modeling and simulation for varying die gap fluid extrusion