Improvements relating to cooling plugs in thermoplastic pipe for

Details Improvements relating to cooling plugs in thermoplastic pipe for Improvements relating to cooling plugs in thermoplastic pipe for

1992-04-01

1993-02-16

Chiesa, Richard L.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

26421113, 264508, 264568, 425 721, 425336, 425393, 425396, B29C 4790, B29C 5330

Patent

active

051868784

ABSTRACT:
The invention concerns an apparatus and process particularly for molding profile thermoplastic tubing and process. The apparatus includes the travelling mold type for molding profile tubing, e.g. corrugated or ribbed, including double walled tubing of various types. A sizing plug for the internal diameter of the pipe is provided with suction applying device which applies suction of diminishing strength in the upstream direction of the plug to the inside diameter of the pipe to provide a smooth inside wall of the pipe and allowing faster pipe formation. Suitably, the plug is a cooling plug and provision may be made for communicating the suction to cooling liquid to draw it to the surface of the plug to provide lubrication for a faster pipe forming process.

REFERENCES:
patent: 3182108 (1965-05-01), Branscum
patent: 3212135 (1965-10-01), Branscum
patent: 3320637 (1967-05-01), Van Dijk
patent: 3907961 (1975-09-01), Carrow
patent: 4365948 (1982-12-01), Chaplain
patent: 4377545 (1983-03-01), Hornbeck
patent: 4545751 (1985-10-01), Lupke
patent: 4555230 (1985-11-01), Lupke
patent: 4663107 (1987-05-01), Takada et al.
patent: 4710337 (1987-12-01), Nordstrom
patent: 4750873 (1988-06-01), Loe et al.
patent: 4808098 (1989-02-01), Chan et al.

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