Process for production of cellular thermoplastic bodies

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

1975-06-04

1976-08-17

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Carbonizing to form article

Agglomeration or accretion

259191, 264 401, 264 459, 264 50, 264211, 264DIG5, 264DIG13, 425817C, B29D 2700, B29F 106, B29F 306

Patent

active

039754731

ABSTRACT:
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 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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