| 摘要 |
Provided is a cap-type synthetic resin container lid (2) configured so that the container lid (2) can be sufficiently easily removed from the mouth (38) of a container without requiring large force and so that, after being removed from the mouth (38) of the container, the container lid (2) is kept integrated without a part of the container lid (2) being separated and becoming debris. The container lid (2) includes thin-walled inverted sections (18) arranged at circumferential intervals and extending upward beyond a top surface wall (4) from the lower ends of the thin-walled inverted sections (18), the lower ends being connected either to the outer peripheral surface of a skirt wall (6) or to the boundary between the outer peripheral surface of the skirt wall (6) and the upper surface of the top surface wall (4); a retention wall (20) connected to the upper ends of the thin-walled inverted sections (18) and having a specific portion (22) in the circumferential direction, the specific portion (22) being split or being defined by a breakable weakened section (24); and an operation section (30) connected at a position aligned with the specific portion (22) to the outer peripheral surface of the skirt wall (6) by a connection section (28) radially extending from the outer peripheral surface of the skirt wall (6). The retention wall (20) and the connection section (28) are provided with an engagement receiving protrusion (26) and an engagement protrusion (36), the engagement receiving protrusion (26) and the engagement protrusion (36) cooperating with each other to limit the expansion of the retention wall (20). |
