Process for production of multi-layer pipes for draw-forming

Details Process for production of multi-layer pipes for draw-forming Process for production of multi-layer pipes for draw-forming

1984-12-26

1987-03-10

Silbaugh, Jan

Plastic and nonmetallic article shaping or treating: processes

Utilizing special inert gaseous atmosphere or flushing mold...

264173, 264514, 264515, B29C 4788

Patent

active

046490043

ABSTRACT:
A process for the production of a multi-layer pipe to be used for formation of a bottle by drawblow-forming, comprising forming by co-extrusion a pipe having inner and outer layers of a polyester composed mainly of ethylene terephthalate units and an intermediate layer of an oxygen-barrier resin interposed between the inner and outer layers. An adhesive resin layer is preferable interposed between every two adjacent layers. The co-extruded multi-layer pipe is sized in the molten state so that the diameter of the pipe is uniform. The process continues by cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing an inert gas or an inert gas containing a water mist into the interior of the pipe to thereby cool the inner portion of the pipe and prevent oxidation in the pipe. A multi-layer pipe prepared according to this process is excellent in the transparency and the draw-formability into a multi-layer drawn bottle.

REFERENCES:
patent: 4002709 (1977-01-01), Mozer
patent: 4088724 (1978-05-01), Kuhnert
patent: 4436778 (1984-03-01), Dugal
U.S. Def. Publ. T978,005, P. L. Funck, 1/1979.

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