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Polymer Processing Instabilities: Understanding and Mitigating Flow Defects
"Polymer processing instabilities are flow-induced irregularities that occur during the shaping of molten plastics, typically arising when shear or extensional rates exceed specific critical thresholds. These instabilities, such as sharkskin, stick-slip, and gross melt fracture, compromise the structural integrity and aesthetic quality of the final product. Understanding these phenomena requires an analysis of the polymer's viscoelastic properties, die geometry, and the boundary conditions at the material-wall interface. The Fundamentals of Polymer Melt Rheology To understand why instabilities occur, one must first grasp the complex nature of..."
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