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AssigneeToyo Seikan Kaisha, Ltd.
InventorsShigezo Nohara, Takeshi Sugimoto, Kozaburo Sakano, Yoshimichi Ohkubo, Junichi Matsuo
Estimating the term…
A process for the production of a multi-layer pipe to be used for formation of a bottle by draw-blow-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 preferably interposed between every two adjacent layers. The co-extruded multi-layer pipe in the molten state so that the diameter of the pipe is sized 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.
A multi-layer polyester bottle formed of a laminate comprising (i) inner and outer layers of a polyester composed mainly of ethylene terephthalate units, (ii) an intermediate layer of an oxygen-barrier resin and (iii) an adhesive resin layer interposed between every two adjacent layers, said bottle being obtaining by (I) co-extruding said resin into a pipe comprising said laminate, said pipe having the thickness ratio of the inner polyester layer to the outer polyester layer of from 1/1.1 to 1/5, (II) solidifying the extruded pipe by cooling, (III) cutting the solidified pipe into a predetermined size, (IV) forming a closed bottom on one end of the cut pipe, (V) heating the obtained preform at a drawing temperature and (VI) biaxially stretch-blow-forming the heated preform into the bottle.
Dependencies are inferred from the claim text.