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.

Knowledge Center

Insights into plastics technologies from industry experts.

Features

NPE2018 New Technology Focus: Film & Extrusion Coating

Check out what’s new in blown and cast film and extrusion coating at the big plastics industry trade show. 
Features

Are Blown Film Processors Getting The Biggest Bang for Their Resin Buck?

Decades-old extrusion equipment may be holding some processors back, says Alpine exec Nunes.

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Cost-Performance Options Expand In Cast-Film Dies

Alternative for cast-film applications that do not call for the special capabilities of high-end die.