Patent ID: 8528304

Claim:
A method for producing a content filling bottle, in which liquid contents are sealed inside a synthetic resin bottle, said bottle comprising a hollowed body part, an opening formed at an upper end of the body part and onto which a cap is capable of being fitted, a shoulder part formed below the opening on an upper portion of the body part, a bottom part closing a lower end of the body part, and an inversion part formed in a portion of the bottom part so as to project outwardly from the body part in an axial direction of the body part, the inversion part being capable of being inverted and recessed inwardly into the body part in the axial direction thereof, the method comprising: a content filling step in which liquid contents are filled into an interior of the empty bottle with said inversion part projecting outwardly from the body part and with the contents not filled therein yet, and a sealing step in which the cap is fitted onto the opening of the filled bottle with the liquid contents filled therein in the content filling step to seal the bottle, the method further comprising: a bottle retaining step performed after the sealing step, the bottle retaining step fitting a pair of pressing concave parts with shapes corresponding to the shoulder part of the bottle around opposite sides of the shoulder part of the filled bottle, thereby gripping the bottle so that the bottle is inhibited from moving in a vertical direction; and a bottom part recessing step in which said inversion part of the bottom part of the filled bottle retained in the bottle retaining step is pressed up so as to be inverted and recessed inwardly into the bottle.