Abstract
The properties of polymer films can never be separated from the process by which they are made. The stress and strain history imposed on the polymer as it is melted, extruded through the die, drawn to its final shape, and quenched affects orientation, crystallinity, and morphology of the film. These in turn impact the mechanical, optical, barrier, and other film properties. To illustrate the importance and complexity of the effect of processing on flexible packaging films, three examples involving blown film are presented:•The effect of stress–strain history on film mechanical properties. In particular, the differences in strain history between monolayer and coextruded films and how this translates into property changes is highlighted.•The effect of quench rate on properties. Key differences between air-quench versus water-quench blown film and their influence on the properties of barrier coextruded film are discussed.•The effect of orientation on blend morphology.
Published Version
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