| 摘要 |
PROBLEM TO BE SOLVED: To provide a pressure resistant bottle that has an increased strength in a bottom part to reduce a deformation when the inside of the bottle is brought into a positive pressure state, and is efficiently produced and excellent in an appearance.SOLUTION: A pressure resistant bottle 10 is equipped with a neck part, a barrel part 12 provided below the neck part, and a bottom part 20 provided below the barrel part 12. The bottom part 20 has an annular grounding part 21, a bottom part inside surface 22 provided inside the grounding part 21, and a bottom part outside surface 23 provided outside the grounding part 21. In the bottom part inside surface 22, a plurality of short grooves 30a and a long groove 30b that are recessed inward are formed from a corner part 31 in a central direction of the bottom part inside surface 22. The long groove 30b is arranged to pass through a center of the bottom part inside surface 22 and to extend from one side of the corner part 31 to the other side thereof. The plurality of the short grooves 30a and the long groove 30b are separated mutually, and the plurality of the short grooves 30a are arranged on both sides with the long groove 30b in between. |
