5. Limits of the flat film extrusion process
Analysis of the cast process shows that the flow of molten polymer during stretching is mainly elongational. To quantify the intensity of this elongation, it is conventional to introduce the notion of draw ratio, defined as (see figure
22
):
with :
- U :
- linear flow velocity at the die outlet (index 0 ) or on the thermostated roller (index...
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Limits of the flat film extrusion process
Modeling the drawing stage
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