Extrusion method

Details Extrusion method Extrusion method

1990-06-04

1991-11-05

Thurlow, Jeffery

Plastic and nonmetallic article shaping or treating: processes

Direct application of fluid pressure differential to...

Producing multilayer work or article

15624413, 15624415, 264173, 264174, 2642098, 4251331, 425380, 425403, 425467, B29C 4720

Patent

active

050630180

ABSTRACT:
Multiple lumen tubing is extruded by first extruding an inner tube of molten plastic about a metallic, bore-forming mandrel wire, followed by extruding about the inner tube an outer tube of molten plastic having a lumen formed by air mandrel means, with the inner and outer tubes being bonded together. This may be accomplished by means of a mandrel which is positioned in an extrusion die, with the mandrel defining a distal end portion positioned and shaped to form a lumen in the tubing, and an air flow passage extending through the mandrel to provide an air mandrel to the newly formed lumen to prevent its collapse. The distal end portion of the mandrel may be carried by an intermediate neck portion which has at least one transverse dimension that is less than the corresponding transverse dimension of the distal end portion.

REFERENCES:
patent: 3755525 (1973-08-01), Sheridan et al.
patent: 3792951 (1974-02-01), Meyers
patent: 4100246 (1978-07-01), Frisch
patent: 4277432 (1981-07-01), Woinowski
patent: 4321226 (1982-03-01), Markling
patent: 4636346 (1987-01-01), Gold et al.
patent: 4655987 (1987-04-01), Zertuche
patent: 4753765 (1988-06-01), Pande
patent: 4764324 (1988-08-01), Burnham
patent: 4904431 (1990-02-01), O'Maleki

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