Process for production of cellular thermoplastic bodies

Details Process for production of cellular thermoplastic bodies Process for production of cellular thermoplastic bodies

B - Operations, Transporting

29

C

18/666

B29C 44/34 (2006.01) B29C 44/32 (2006.01)

Patent

CA 1069662

ABSTRACT OF THE DISCLOSURE A process is provided for the production of a cellular thermoplastic body, wherein solid thermoplastic material is melted under pressure in an extruder, a gaseous blowing agent is injected into the molten thermoplastic material under pressure and said molten thermoplastic material and said gaseous blowing agent is passed to a zone of reduced pressure to effect the cellular expansion of said thermoplastic material by said gaseous blowing agent, and wherein said gaseous blowing agent is metered at sonic velocity at a point upstream of the injection of said gaseous blowing agent into said molten thermoplastic material.

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