PT ZONE: Film Extrusion

Entek Running World’s Largest Line for Lead-Acid Battery Separators
Machine-building sister company furnished the twin-screw extruder and most other line components. More (+)
EXTRUSION AND COMPOUNDING AT NPE: The Word Is ‘More’
As in speed, power, quality, flexibility, layers, and efficiency. Those are the trends across all extrusion processes. More (+)


MOST RECENT CONTENT: Film Extrusion

EXTRUSION: Winder Rebuild/Loaner Program Launched

Get a loaner turret winder while your old one is getting rebuilt.

EXTRUSION: Scrap-Reducing Air Rings

Unit said to reduce start-up scrap and starting 2-sigma gauge variation by 80%.

EXTRUSION: Stack Can Handle Very Thin PET Sheet

Specialized equipment no longer needed for this application.

EXTRUSION: Integrated Roller Design

New design approach reportedly results in more reliable heat-transfer rollers for film and sheet processors.

Coextruding Blown Film Today Requires Deeper Understanding of Resin Rheology & Die Design

More film processors are investing in lines with nine or more layers. With more resin possibilities and combinations coming into play, it’s important to learn more about material rheology and compatibility, as well as die design.

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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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