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Article | REF: AM3643 V1

Tube extrusion lines - Processess

Author: Stéphan PUISSANT

Publication date: July 10, 2009

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2. Expansion (cellular foam)

The expansion (or foaming) process was first used with polymers in the 1930s for the manufacture of injected PS polystyrene parts. .

Then, in the 1950s, Dow patented a continuous extrusion process (using an extrusion screw) for foamed plate in PS .

Since then, this type of process has been widely developed and applied to all thermoplastics (see [AM 3 550] Foamed polymers. Presentation and properties). In general, amorphous polymers (such as PS) are easier to foam than semi-crystalline polymers. This is because the process...

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