| abstract |
A biaxially stretched, blow molded bottle made of a resin of the PET series has a bottle neck that is formed by expanding a body of a preform in a shape of a test tube to give the bottle neck a large diameter, just as the preform is expanded to obtain a body of the bottle, in a stretching step of a biaxial stretching and blow molding process. The bottle neck density is set at 1.368 g/cm 3 or more or a ratio of an absolute value of crystallization enthalpy, ΔHc, to melting enthalpy, ΔHm, (that is, |ΔHc|/ΔHm) is set at a value less than 0.1, by meeting a processing condition for stretching in a stretching step and by setting a predetermined mold temperature within a thermally crystallizable range used for the resin of the polyethylene terephthalate series. |