PT ZONE: Film Extrusion

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MOST RECENT CONTENT: Film Extrusion

EXTRUSION: ‘Next-Generation’ Cast Stretch Film Lines

Seven-layer line has six extruders, two operator workstations, scrap refeed.

The Extrusion 2015 Conference: Open for Business

Registration is now open for a new conference that hits on all extrusion technologies. Go online and sign up: Nov. 2-3, Charlotte, N.C.

Nova Installs Nine-Layer Blown Film Line to Enhance Customer Collaboration

It's said to be a first for PE resin producers in North America.

EXTRUSION: How to Adjust for Shrinkage and Orientation

Polymers shrink and orient. Sometimes orientation is unbalanced, resulting in misshaped parts. But there are steps beyond tweaking the die that can mitigate these effects.

Seven New Technologies Debut at W&H Open House

Among them at the two-day event in Germany is a new method to drastically reduce product-changeover times.

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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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