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\ Schematic of coextrusion membrane die
9.6 Coextrusion
Coextrusion is the simultaneous extrusion of two or more polymers through a single die where the polymers are joined together such that they form distinct, well-bonded layers forming a single extruded product.
Coextrusion has been applied in film, sheet, tubing, blown film, wire coating, and profile extrusion.
Advantages of coextrusion are better bonds between layers, reduced materials and processing costs, improved properties, and reduced tendency for pinholes, delami- nation, and air entrapment between the layers.
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