Article | REF: AM3707 V1

Flat film extrusion: cast film

Author: David SILAGY

Publication date: October 10, 2005

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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 ):

Dr=UfU0( 1 )

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