4. Preventing interface instabilities
The search for stable coextrusion configurations can be conducted according to two approaches:
optimization of process parameters for fixed products,
optimizing product properties for a given process.
4.1 Process parameters and tool sizing
Linear stability studies are the investigative tool of choice for optimizing process parameters in simple geometries. A decrease in the state of stress in the die (by increasing temperature, for example) has the effect of reducing the value of viscosity and stress jumps at the interface (unless the thermodependence of the materials is very different), thus promoting stability. What's more, in highly unstable cases, choosing a short...
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Preventing interface instabilities
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