Patent ID: 8524340
Filing Date: 2013-09-03
Classification: B29B,B29C,B29K,B29L,B65D,Y10T

Abstract:
1. A biaxially drawn, blow-molded bottle, comprising: a body having a bottom; a neck, including an opening and a neck ring remote from the opening, the neck being subjected to a thermal crystallization treatment that is a whitening treatment; a screw threaded portion positioned on the neck between the opening and the neck ring; resinous layers mainly made of polyethylene terephthalate; and at least a layer of a gas barrier material laminated with said polyethylene terephthalate layers, wherein said gas barrier layer extends only from (a) a level lower than the screw-threaded portion in a direction toward the bottom of the body and falling in a range between a half-height of the neck, including the neck ring, and an upper portion of said neck ring, to (b) a position in a range from a lower end of the body to the bottom, to avoid deformation from occurring in the screw-threaded portion of a cap, because when the neck is thermally crystallized, the extent of shrinkage caused by the thermal crystallization treatment becomes lower because of a difference in the rate of shrinkage between the PET resin and the gas barrier material, and because after the thermal crystallization treatment, the neck tends to have larger dimensions than the set values and an elliptic cross-sectional shape, thus making it difficult to form the neck within set values, and wherein the gas barrier layer inside the wall of said neck has a rate of occupancy of 8.2% or less in the total weight of the gas barrier material.