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(PART 1)

Rafael J. Castillo, Dual Spiral Systems Inc., Hamilton, Ontario, Canada


     Blown and cast film coextrusion is growing in popularity due to an increased impetus towards the reduction in raw material costs. In addition it is a well known fact that coextrusion provides advantages in terms of a film's physical properties. This is to say that multi layer film properties have long been known to outperform less advanced films of fewer layers in terms of economics and properties traits.
     Little, if any, qualitative film properties data is available to support the above statement. This paper will describe an ongoing study whose purpose will be shed light on the subject by providing a basis for the analysis of two seemingly equivalent coextruded 5 material component films that were manufactured on different blown film dies designs. The only variable changed was the overall number of film layers. Initial data was collected to this effect and will be presented here.

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