PT ZONE: Film Extrusion

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. More (+)
Novel Package Nabs Another Award
Third time Clear-Lam's PrimaPak has been acknowledged. More (+)


MOST RECENT CONTENT: Film Extrusion

EXTRUSION: ‘Universal’ Winder for Geomembrane, Ag Films

Center-turret type has two winding modes.

EXTRUSION: Specialty Film Solutions Highlighted at NPE

Included are systems for solar and capacitor films.

EXTRUSION: ‘Next Generation’ Gravimetric Extrusion Control System

Technology developed to maintain consistent extruder output by weight.

How to Split & Clean Flat Dies

Notice a drop-off in quality of your flat film or sheet? It may signal that a die ‘split-and-clean’ is due. Here’s how to get going.

BOPP Processor Focuses on Specialties

At one time, BI-AX International produced millions of pounds of BOPP film a year for a wide range of commodity products. But it has since transitioned toward higher-value niche products for medical and packaging.

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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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