Film Extrusion

Film is divided into two subcategories: cast, or flat film; and blown film. In the former, hot plastic is extruded through a flat, slit die onto a polished chill roll where it is quenched, pulled to a second set of rolls to cool the other side, then wound. In blown film, plastic is extruded into a cylindrical die, then inflated to form a bubble, which is ultimately cooled and collapsed. Films can be either single or multi-layer. Most are based on polyethylene. Bags are one primary example of film extrusions.

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Packaging Converter Launches Film-Extrusion Business
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Packaging Converter Launches Film-Extrusion Business

Polymer Film & Bag Inc. will start with three-layer capacity of more than 20 million lb/yr, with additional expansion plans already firmed up.
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What You Need to Know to Get into Coextrusion

Key considerations range from determining the right extruder sizes to tooling, matching material viscosities, and lots more. Take a look.