Using Computational Fluid Dynamics (CFD) to analyse the limits of the secondary layer thickness in multi-layered polyester film processes, 14th TAPPI European PLACE Conference

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Polyester based multi-layered films (MLFs) are films made up of several different polymer layers, with applications including touch screens, smart cards and food packaging. The use of multiple layers gives increased functionality compared with mono-layered products. Such MLFs are formed when different low Reynolds number polymer melt flows come together in a process known as coextrusion. The main coextrusion geometries used to achieve these structures involve an injector block linked to a die or a multi-manifold die.