| 摘要 |
PROBLEM TO BE SOLVED: To enable maintenance of torque at a relatively low state when opening, and prevention of excessive rise of container internal pressure during resealing.SOLUTION: A plurality of vent holes 12 for releasing internal pressure during opening, which are formed in a slit shape in a circumferential direction except in a portion of a knurl non-formation area, and upper projections 12a formed by bending the upper opening ends of the vent holes 12 in a radially inward direction of a cylindrical part 5 are provided in the vicinity of a top face 4 of the cylindrical part 5. The knurl non-formation area is provided with: an internal pressure releasing slit 14 which opens at predetermined internal pressure in a state of being mounted to a base part 31 of a bottle can 3; and at least one auxiliary projection 15 formed by bending a portion of the upper edge part disposed on the internal pressure releasing slit 14 in the radially inward direction of the cylindrical part 5. The tips of the upper projection 12a and the auxiliary projection 15 are arranged radially inward from the outer peripheral edge of a liner 2, and the liner 2 is held between the upper projection 12a, the auxiliary projection 15, and the top face 4. |
