Method for producing polyester container

Details Method for producing polyester container Method for producing polyester container

B - Operations, Transporting

29

C

18/1171, 18/540,

B29C 71/02 (2006.01) B29C 49/64 (2006.01) B29C 35/08 (2006.01) B29C 71/00 (2006.01)

Patent

CA 1143522

ABSTRACT OF THE DISCLOSURE Spherulites grow in such sections as neck, neck and, bottom center or bottom periphery of a hollow bottle-shaped container of biaxially orientation-blow molded polyethylene terephthalate where the the resin is not substantially subjected to orientation, thereby to improve the thermal resistance, stiffness and content resistance of such sections to almost the same extent as the biaxially oriented sections of the container such as shoulder and cylindrical sections thereof. The aforesaid sections of the preformed piece before being blow-molded or of the blow-molded container where the resin is not substantially subjected to orientation are first heated at 120 - 180°C for 3 - 8 minutes and, then, annealed at room temperatures, with a result that such sections have a suphrulite texture of an increased density and are opacified in white or milky white. - 1 -

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