Advancements in Screw Design Technology for the Blown Film Industry, 2006 PLACE Conference

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New advances in screw designs and mixing sections have allowed processors to take advantage of new resins, higher production rates, and improved product quality. With the advances in new material formulations, additives and fillers, the screw design must be able to fully melt and disperse the additives in the polymer matrix without destroying the properties from excess shear. This paper will review the melting performance of typical blown film screw designs currently available and present data on the melting performance of a new screw design with a unique flight geometry that maximizes the conductive melting mechanism (low shear) in the screw channel.