Agitating – Rubber or heavy plastic working – With specified feed means
Patent
1980-11-10
1982-08-17
Jenkins, Robert W.
Agitating
Rubber or heavy plastic working
With specified feed means
366 89, 264 53, B29B 300, B29B 502, B29B 106
Patent
active
043447104
ABSTRACT:
A continuous foam production system is disclosed wherein a molten thermoplastic resin is mixed with volatile blowing agent at elevated pressure to form an extrusion mass. A helical screw extruder means is adapted to extrude the molten resin with volatile blowing agent into a low pressure foaming zone to form a foam sheet, tube or other shape. An improved fluid handling system includes storage means for holding at least one of a plurality of disparate volatile liquids under pressure sufficient to maintain a normally gaseous blowing agent in liquified state and cooling means for receiving a pressurized first stream of liquified thermally-gaseous blowing agent and cooling below its autogenous temperature. A pump operatively connected between the cooling means and extruder means increases pressure of the first stream higher than the elevated pressure of the extruder, where it may be combined with a pressurized stream of second liquid blowing agent. Flow control means is provided for injecting a predetermined amount of disparate liquid blowing agents from the first and second streams into the extruder means at elevated pressure to form an extrusion mass.
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Johnson D. Emil
Krutchen Charles M.
Sharps, Jr. G. Vincent
Gilman M. G.
Huggett C. A.
Jenkins Robert W.
Mobil Oil Corporation
O'Sullivan, Sr. J. P.
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