Extruder head for making anticorrosive tubular polymeric film

Details Extruder head for making anticorrosive tubular polymeric film Extruder head for making anticorrosive tubular polymeric film

1989-03-24

1990-07-03

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

Shaping orifice and downstream work contacting gaseous...

2642093, 2642104, 26421113, 264565, 425 94, 425104, 4253261, B29D 2322

Patent

active

049386743

ABSTRACT:
An extruder head for making an anticorrosive tubular polymeric film has a body having an extrusion die, a hollow core mounted in the body and extending through the extrusion die, a molding passage terminating in an annular opening. Chambers are defined in the body of the core and die in the zone of the annular opening, the core chamber communicating with a passage for supplying a corrosion inhibitor, A pipe for supplying compressed air is provided in the interior of the core for blowing polymer melt into a tube. A scroll having a tangential nozzle for supplying compressed air is secured to one end of the pipe and is provided with a diaphragm in the form of a converting tube coaxial therewith and communicating with the chamber of the extrusion die. The other end of the pipe is made in the form of an opening-forming diverging tube.

REFERENCES:
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patent: 3069727 (1962-12-01), Shramek
patent: 3714309 (1973-01-01), Biglano
patent: 3902832 (1975-09-01), Gregory et al.
patent: 4019843 (1977-04-01), Zimmermann
patent: 4105380 (1978-08-01), Zimmermann
patent: 4473527 (1984-09-01), Fujisaki et al.
patent: 4627805 (1986-12-01), Schnell

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