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Extrusion Dies Industries (EDI) claims its new microlayer technology can reduce the oxygen transmission rate (OTR) in film and sheet for packaging applications by up to 80%.
“By transforming a single layer of a resin such as EVOH into several microlayers, it is possible to reduce OTR by 60-80%,” says VP of technology Gary D Oliver. “And while EVOH is a crystalline, relatively brittle material, replacing a single thick layer with multiple microlayers increases formability for thermoforming and flexibility for vacuum skin packaging.”
To make the multi-layered material, EDI uses a tool called a multiplier to create layers within a coextrusion ‘sandwich'. The structure is then fed into the manifold of an extrusion die to make film or sheet.