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AssigneeToyo Seikan Kaisha, Ltd.
InventorsShigezo Nohara, Takeshi Sugimoto, Kozaburo Sakano, Yoshimichi Ohkubo, Junichi Matsuo
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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.
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 polyester composed mainly of ethylene terephtahalate units and an intermediate layer of 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 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 without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state.
A process for the preparation of a multi-layer polyester vessel which comprises forming by co-extrusion of pipe comprising inner and outer layers of a polyester composed mainly of ethylene terephtahalate 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, cooling the outer portion of the molten multi-layer pipe by contact with water and simultaneously introducing 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 without crystallization, thereby forming a solidified pipe wherein both of the outer portion and the inner portion thereof are maintained in an amorphous state, cutting the solidified pipe into a predetermined size, forming a closed bottom on one end of the cut pipe and a portion to be engaged with a lid member on the other end of the cut pipe, preliminarily heating the so-formed preform at a drawing temperature of 85.degree. to 120.degree. C., and stretching and drawing the preliminarily heated bottomed preform in the axial direction and simultaneously expanding and drawing the preform in the circumferential direction by blowing of a fluid.
Dependencies are inferred from the claim text.