Molding method and cooling apparatus for pressure resisting bottles of synthetic resin

A cooling apparatus for cooling at least one pressure resisting bottle of synthetic resin, each of said at least one bottle having a big foot type petaloid bottom, said apparatus being provided for cooling the bottom of each of said at least one bottle after said at least one bottle is released from a molding device, said apparatus comprising:

• a double-form jig comprising a mold face, the mold face having a center part with a projecting height that is higher than a height of a center part of a bottom mold of the molding device, said double-form jig further including a jet mouth for providing cooling air to the center part of said mold face;
• a press jig capable of holding each of said at least one bottle, said press jig being cooperable with said double-form jig to press said bottom of each of said at least one bottle to the mold face of said double-form jig;
• and
• a cooling nozzle that enters inside each of said at least one bottle, blows air to an upper surface of the bottom of each of said at least one bottle and provides pressure inside each of the at least one bottle.