Patent ID: 7459119
Filing Date: 2008-12-02
Classification: B29B,B29C,B29K,B65D,Y10S,Y10T

Abstract:
1. A method for molding a laminated polyester resin container, comprising: (a) Preparing in advance a multilayer preform by injection-molding said preform in a predetermined shape that corresponds to the shape of a finished molded product, wherein the mouth/neck portion consists of a single layer of the polyester resin and wherein the body portion, including trunk and bottom but excluding said mouth/neck portion, comprises an outer and an inner layer of the polyester resin and at least a medium or intermediate layer of a gas barrier resin; (b) heating the body portion of said preform to a blow moldable temperature within the range of 90° to 120° C.; (c) setting said heated preform in a primary blow mold that has been heated to a temperature within the range of 70° to 180° C. and blow molding said preform in the biaxial orientation to form a primary molded intermediate; (d) heating said primary intermediate to a temperature within the range of 130° to 200° C. to deform it forcibly by thermal shrinkage and thereby to form a secondary molded intermediate; and (e) setting the shrunken secondary intermediate in a secondary blow mold that has been heated to a temperature within the range of 80° to 150° C., and subjecting said secondary intermediate to secondary blow molding with biaxial orientation to obtain a finished molded product.