PT ZONE: Film Extrusion

How This Processor Does Color Right
A film extruder shares some of its insights. More (+)
K 2016 Preview: Extrusion and Compounding
Regardless of what you might be extruding, the themes of speed and flexibility will loom large in extrusion at the giant show. More (+)


MOST RECENT CONTENT: Film Extrusion

EXTRUSION: Is Head Pressure Sapping Your Extruder’s Strength?

A redesign of all of the flow paths between the end of the barrel and die may be in order.

Italian Film-Extrusion Supplier Expands in U.S.

Cast and blown film lines from new U.S. office.

EXTRUSION: News in Screen Changers at K 2016

New PLC touchscreen controller, new screen changer for high-viscosity polymers to debut.

EXTRUSION: Adaptable Lines For Coating, Film

Systems available for wide range of flexible film processes.

New ASTM Standard Proposed For Film-Thickness Measurement

Proposed non-contact method reportedly will help processors get "more precise and accurate measurements.'

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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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