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1995 Coextrusion Layer Thickness Variation—Effect of Polymer Viscoelasticity on Layer Uniformity
Joseph Dooley and Kevin Hughes The Dow Chemical Company, Midland, MI


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Abstract

The effect of polymer viscoelasticity on the layer thickness uniformity of multilayer coextgruded structures was investigated using a unique feedblock technology. This type of feedblock produces a coextruded structure consisting of an array of 49 individual strands (7 rows by 7 columns) of one polymer surrounded by a matrix of another polymer. These strands are excellent tracers of flow paths which can be used to determine movement within a flowing viscoelastic polymer stream.



To view the entire paper, please use the following link: Best Paper 1995.pdf