Patent ID: 8980390
Filing Date: 2015-03-17
Classification: B29C,B29K,B29L,B65D,Y10T

Abstract:
1. A bottle made of a resin comprising at least one of polyethylene terephthalate and a copolymerized polyester comprising ethylene terephthalate, the bottle being molded by a biaxial stretching and blow molding process, and the bottle comprising: a bottle body; and a bottle neck formed, just as the bottle body is formed, by expanding a body of a preform in a shape of a test tube in a stretching step of the molding process, wherein the bottle neck has an average thickness in a range of 1.0 to 1.8 mm, wherein the bottle neck has a total draw ratio (product of a vertical draw ratio and a lateral draw ratio) of about 4 times, wherein the bottle neck is formed in a portion of a mold that is set at a temperature within a thermally crystallizable range of the resin, wherein a ratio of an absolute value of crystallization enthalpy, ΔHc, to melting enthalpy, ΔHm (|ΔHcl/ΔHm) of the bottle neck is a value less than 0.1, the crystallization enthalpy ΔHc being calculated from an exothermic peak appearing at the time of crystallization of a sample of the bottle neck; and the melting enthalpy ΔHm being calculated from an endothermic peak appearing at the time of melting of the sample of the bottle neck, as observed by differential scanning calorimetry (DSC) measured at temperatures rising at a constant speed, and wherein a rate of dimensional change in the outer diameter of the bottle neck is kept at 0.2% or less, as calculated in heat tests conducted by filling the bottle with hot water having a temperature of 90° C.