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

B - Operations, Transporting

29

C

18/514, 18/777

B29C 49/22 (2006.01) B29C 47/06 (2006.01) B29C 47/88 (2006.01) B29C 49/00 (2006.01) B29D 22/00 (2006.01) B29C 49/04 (2006.01)

Patent

CA 1240113

Abstract of the Disclosure Disclosed is a process for the production of a multi- layer pipe to be used for formation of a bottle by draw- blow-forming, which comprises forming by co-extrusion a pipe comprising 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, if necessary with an adhesive resin layer interposed between every two adjacent layers, sizing the co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is uniform, and 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.

471007

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