Method of and system for injecting a fluid into a plastified mas

Details Method of and system for injecting a fluid into a plastified mas Method of and system for injecting a fluid into a plastified mas

1981-05-21

1983-04-26

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

With measuring, testing, or inspecting

Controlling fluid pressure in direct contact with molding...

264 405, 264 407, 264 50, 264349, 425 4C, 425 4R, 425146, 425155, 425156, 425817R, B29D 2700

Patent

active

043812724

ABSTRACT:
An extruder system has an extruder provided internally with a worm. A source of an additive fluid under pressure is connected to a conduit opening into the barrel. An upstream valve and a downstream valve are provided in this conduit and a pressurizable fluid reservoir is provided in the conduit between the valves. The extruder is continuously rotated in the barrel to plastify a resin therein. The valves are alternatively opened and closed, that is one is open when the other is closed and vice versa, so that a fluid first flows from the source through the upstream valve into the reservoir and then from the reservoir through the downstream valve into the barrel to be mixed by the worm with the plastic resin therein. The reservoir can be a cylinder having a piston advanced when the downstream valve is opened to force the charge of additive fluid in the reservoir into the barrel.

REFERENCES:
patent: 3697204 (1972-10-01), Kyritsis et al.
patent: 3755516 (1973-08-01), Bonikowski et al.
patent: 3891362 (1975-06-01), De Vita
patent: 3981649 (1976-09-01), Shimano et al.
patent: 4043715 (1977-08-01), Hendry
patent: 4107354 (1978-08-01), Wilkenloh et al.
patent: 4211523 (1980-07-01), Hunerberg

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