Sheet Extrusion

Sheet is distinguished from film by its thickness: anything over 0.25-mm is considered sheet. The process closely resembles cast film extrusion. Thinner sheet is typical thermoformed into trays, clam shells, cups or bowls, whereas thick sheet may be used for signage, refrigerator liners and truck bed liners. Common sheet extrusion materials include PET, high-density polyethylene, polystyrene and ABS. Sheet can be produced in either single or multi-layer formats.

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ASTM standard on film thickness testing
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New ASTM Standard on Thickness Measuring to Boost Film Quality

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

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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.