Method and apparatus for extrusion of thermoplastic foam

Details Method and apparatus for extrusion of thermoplastic foam Method and apparatus for extrusion of thermoplastic foam

B - Operations, Transporting

29

C

18/661

B29C 67/20 (2006.01) B29C 44/34 (2006.01) B29C 47/50 (2006.01)

Patent

CA 1225211

METHOD AND APPARATUS FOR EXTRUSION OF THERMOPLASTIC FOAM Abstract Introducing gaseous blowing agent into molten polystyrene. This is accomplished by a pneumatically activated piston which injects the gas into the molten polystyrene as a result of both the forward and return thrust of the piston.

433401

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