Effect of second to first normal stress difference ratio at the die exit on neck-in phenomenon in polymeric flat film production

This review provides the current state of knowledge of steady-state modeling of the extrusion cast film process used to produce flat polymer films, as well as related experimental research with a particular focus on the flow instability neck-in. All kinematic models used (i.e., 1-, 1.5-, 2-, and 3-dimensional models) together with the utilized constitutive equations, boundary conditions, simplified assumptions, and numerical methods are carefully summarized. The effect of draw ratio, Deborah number (i.e., melt relaxation time related to experimental time), film cooling, second to first normal stress difference ratio at the die exit, uniaxial extensional strain hardening, and planar-to-uniaxial extensional viscosity ratio on the neck-in is discussed.

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Effect of second to first normal stress difference ratio at the die exit on neck-in phenomenon in polymeric flat film production

Cited by 2 publications

References 55 publications

Melt exit flow modelling and experimental validation for fused filament fabrication: From Newtonian to non-Newtonian effects

Melt exit flow modelling and experimental validation for fused filament fabrication: From Newtonian to non-Newtonian effects

Steady-state modeling of extrusion cast film process, neck-in phenomenon, and related experimental research: A review

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