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A Stick-Slip Problem Related to Melt Fracture in Polymer Processing Operations

Abstract A ‘Stick-Slip’ mixed-boundary model is postulated to support the mechanism of transition from no-slip to slip at the polymer/die interface during capillary extrusion of polymeric materials at and above a critical shear rate at a fixed throughput. The predicted shear stress singularity explains the occurence of gross extrudate distortion known as melt fracture.