PT ZONE: Film Extrusion

PT Article Alpine Kicks Off K With Lots of Layers
Layers are great with chocolate cake. And blown film too. Hosokawa Alpine ran what’s believed to be a show first: an 11-layer line producing nylon-based barrier film. More (+)
K 2016: Day Two Show Report
Plastics Technology Editorial Director Jim Callari discusses extrusion trends at K 2016 in Düsseldorf, Germany. More (+)


Extruding Very High-Flow Polymers

Screw designs not suited to process lower-viscosity materials will result in poor melt quality and lower outputs.

Help’s On the Way for Sheet Processors

Do you extrude sheet? Are you interested in networking with fellow processors, suppliers and sheet extrusion experts? Maybe you have questions about new-generation materials, or fundamental issues with drying?

Single-Serve Package Reduces Carbon Footprint By Over 30%

The Freshpack is tailored to workplaces and reduces emissions from raw material extraction by 40% by eliminating aluminum.

Get in the Mood to Extrude

Check out the program for Plastics Technology’s Extrusion 2016 Conference, Dec. 6-8 in Charlotte, N.C.

EXTRUSION: Feedblock Fine-Tunes Layers, Balances Velocities

Device is adjustable in-line and is available with larger than usual channel widths to reduce shear stress and interfacial instability.

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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.

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» Blending & Dosing

Is dosing good enough? Do I need a Blender? Let Maguire walk you through the basics, process integration and more.


» Plastics Conveying

Watch video, download datasheets and more in the Plastics Conveying Knowledge Center.

» Plastics Drying

Novatec shares their knowledge of dryers and drying techniques.

Product Announcements

EXTRUSION: Feedblock Fine-Tunes Layers, Balances Velocities
Nordson Extrusion Dies Industries LLC 9/27/2016
EXTRUSION: Narrow-Web Film Gauge
NDC Technologies 9/21/2016
EXTRUSION: Biax Line in Virtual Reality
Parkinson Technologies Inc. 9/21/2016
EXTRUSION: Stretch Film Line Is ‘Bigger, Faster, Smarter’
Cloeren Incorporated 9/9/2016
EXTRUSION: Narrow-Web Film Gauge
NDC Technologies 9/8/2016

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