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
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Expansion (cellular foam)
Corrugated tube formation
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