Edit1991 An Experimental Study of the Factors Affecting the Layer Thickness Uniformity of Coextruded Structures
J. Dooley and E. Stout - The Dow Chemical Company
EditIntroduction
Coextrusion is a process in which two or more polymers are extruded simultaneously and joined together to form a single structue with multiple layers. This technique allows the processor to combine the desirable properties of dissimilar polymers into one structure. The coextrusion process has been used to produce multilayer sheet, blown film, cast film, tubing, wire coatings, and profiles (1-6).
In this study, a specific feedblock and sheet die combination was used to determine the effect of different extrusion and geometric variables on the layer thickness uniformity of a two layer sheet product. A designed experiment was developed to guide the experimentation and to statistically analyze the results.
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Best Paper 1991.pdf