PT ZONE: Film Extrusion

Processor gives employees the time, resources to “go back to school” at work
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Follow These Tips to Clean Your Blown Film System
Proper purging procedures can avoid the need to shut down the line for cleaning. Here's one expert's advice. More (+)


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OVERVIEW:
Film Extrusion

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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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