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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ASTM standard on film thickness testing
Close-Up on Technology

New ASTM Standard on Thickness Measuring to Boost Film Quality

Non-contact measurement standard should also expedite the testing process.

Close-Up on Technology

Conference Uncovers Innovations Across a Range of Processes, Markets

New materials and additives for injection and blow molding, extrusion, compounding, and thermoforming highlighted the SPE Polyolefins Conference.
New Product Announcements
New Product

Extrusion: System Combines Web Inspection, Thickness/Weight Measurement

Provides full-width, instantaneous, 100% product inspection and measurement.