Apparatus for and method of producing corrugated thermoplastic t

Details Apparatus for and method of producing corrugated thermoplastic t Apparatus for and method of producing corrugated thermoplastic t

1977-02-22

1979-01-23

Lazarus, Richard B.

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Corrugating

425532, 425392, 425396, 264530, 264542, 264564, B29D 2303

Patent

active

041361431

ABSTRACT:
In order, in the molding of corrugated thermoplastic tubing, to overcome the disadvantage that pressurized air which is supplied to a zone within the tube of thermoplastic material as it is extruded from an extrusion head into the entrance of a tubular mold tunnel may tend to cause rupturing of the tube at the area immediately adjacent to the extrusion head where the tube is unsupported by the wall of the tubular mold tunnel the pressurized gas is supplied at a low pressure to a first zone within the tube of thermoplastic material to support the tube against the wall of the tunnel, and pressurized gas at a higher pressure is supplied to a second zone within the tube to urge the tube outwardly into the corrugations of the tubular mold tunnel. A first sealing arrangement separates the first zone from the second zone which is disposed downstream of the first zone, and a second sealing arrangement defines the downstream end of the second zone.

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patent: 3981663 (1976-09-01), Lupke
patent: 4003685 (1977-01-01), Maroschak

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