Method for the production of thermoplastic tubes

Details Method for the production of thermoplastic tubes Method for the production of thermoplastic tubes

1985-06-14

1987-05-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Differential temperature conditioning

264558, 264560, 264568, 2642094, 2642097, 2642105, 425 68, 425 71, 4253261, 425379R, 425388, B29C 4790

Patent

active

046631070

ABSTRACT:
A method for the production of thermoplastic tubes comprising: (1) extruding the thermoplastic tube of which the interior surface in a molten state by a heating unit disposed within the area of a mandrel near the nozzle of an extrusion mold, and (2) sliding the interior surface of the tube on an additional mandrel supported to the front end of the mandrel through a heat-insulating material in axial alignment with the hollow mandrel in a manner to bring the interior surface of the tube into contact with the smooth surface of the additional mandrel and simultaneously cooling the interior surface of the tube with a cooling medium.

REFERENCES:
patent: 2583330 (1952-01-01), Eckert
patent: 3057013 (1962-10-01), Loveless
patent: 3103409 (1963-09-01), Bohres et al.
patent: 3129461 (1964-04-01), Zavasnik et al.
patent: 3182108 (1965-05-01), Branscum
patent: 3212135 (1965-10-01), Branscum
patent: 3320637 (1967-05-01), Van Dijk
patent: 3609809 (1971-10-01), Slicker
patent: 3644696 (1972-02-01), Magner, Jr. et al.
patent: 3907961 (1975-09-01), Carrow
patent: 4123487 (1978-10-01), Saito

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