Plastic and nonmetallic article shaping or treating: processes – With measuring – testing – or inspecting – Controlling fluid pressure in direct contact with molding...
Patent
1981-11-09
1984-03-13
Anderson, Philip E.
Plastic and nonmetallic article shaping or treating: processes
With measuring, testing, or inspecting
Controlling fluid pressure in direct contact with molding...
264 406, 264 407, 264 50, 264 53, 264 54, 264DIG5, 425 4C, 425144, 425145, 425817C, B29D 2700
Patent
active
044366795
ABSTRACT:
A method and apparatus for entraining gas as a blowing agent in a thermoplastic melt to provide a foamed thermoplastic extrudate wherein an annular sheet-like flow of gas under pressure is impinged on a tubular configuration of melt to entrain the gas in the melt is disclosed. Also disclosed is an improved method and apparatus for controlling the pressure in the thermoplastic melt.
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Anderson Philip E.
Maryland Cup Corporation
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