SYNTHETIC RESIN PILFER-PROOF CAP

摘要

A synthetic resin pilfer-proof cap which enables whether the cap has been opened or not to be easily visually confirmed. The front end surface (22) of a flap (16) has formed thereon a sloped surface. In a view of an axial cross-section of a cap body (1) taken so as to include the center axis thereof, the inner angle (a) formed between the sloped surface and the inner surface (25) of the flap (16) in the radial direction is an obtuse angle greater than 90 degrees. When the cap is in a closed state, the flap (16) is in a state in which the flap (16) is in contact at the sloped surface thereof with a protrusion section (52) of the container mouth section (50) and is elastically deformed and pivoted outward in the radial direction about the base end section (16a) as the support point. When a band (3) descends after a bridge (2) is cut, the flap (16) pivots inward in the radial direction due to the elastic restoration force of the flap (16) and interferes with the protrusion section (52) to prevent the band (3) from ascending to the height at which the band (3) is located before the bridge (2) is cut.