| 摘要 |
PROBLEM TO BE SOLVED: To provide a cap in which a protrusion (under-cut) at the inner surface of a skirt section can be easily drawn from a die, a holding force at a notch of the skirt section or the opening of a container near the notch is held at a sufficient level, and a ring-like member also used as an opening piece is applied with strength not overcome by the opening force. SOLUTION: This resin cap is composed of a plurality of notches 11 spaced apart in a circumferential direction to extend in an axial direction at a skirt section 4 of a cap main body 1, a connecting part arranged at an opposite section of an opening tab between a continuous annular member 2 and the skirt section 4, a peripheral and arcuate cutting surface arranged between the skirt section 4 and the annular member 2, a plurality of breakable bridges for connecting the skirt section 4 and the annular member 2 at either a lower side or an upper side than the cutting surface, and a protrusion 7 in a radial diameter direction arranged at a position corresponding to the notch 11 of the annular member 2. |
