Patent ID: 7964257

Claim:
An extrusion blow-molded synthetic resin preform for molding a bottle by a biaxially stretching and blow molding means, said extrusion preform comprising: a mouth portion having a neck ring; a cylindrical barrel portion from which a barrel is molded; a bulging shoulder portion to be molded into a shoulder, said bulging shoulder portion being between, and immediately adjacent to, the neck ring and the cylindrical barrel portion and having a diameter that continuously widens in the downward direction with respect to a vertical central axis of the extrusion preform; a bottom shell portion blow-molded to have a widened and a desired shape; an inner overhang wall portion provided circumferentially on an interior of the extrusion preform around the position of the neck ring, the neck ring being disposed circumferentially around a lower part of the mouth portion, the inner overhang wall portion extending at least from a topmost side of the neck ring to a bottommost side of the neck ring, wherein a diameter of the inner overhang wall portion continuously widens in the downward direction with respect to a vertical central axis of the extrusion preform, wherein the extrusion preform has a wall of a plurality of laminated layers.