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.

Features

K 2016 Extrusion: Speed, Versatility Rule the Day at K

Shorter product runs mean frequent product changeovers for processors, and suppliers responded to these trends across all extrusion technologies.
Features

How to Collect & Interpret Process Data in Extrusion: Part 1

The first installment of this three-part series focuses on proper use of a data- acquisition system.
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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.