SYNTHETIC RESIN CAP, CLOSING DEVICE, AND CONTAINER-PACKED BEVERAGE

摘要

A synthetic resin cap according to the present invention includes a cap body having a top plate and a cylindrical section extending downward from a periphery of the top plate; a circular inner seal projection formed on an inner surface of the top plate and fits into a container opening; and a circular opening edge seal projection formed on the inner surface of the top plate and contacts an opening edge of the container opening, wherein the opening edge seal projection bends and deforms in an expanding radial direction until contacting the cap body at the time of attaching the synthetic resin cap to the container opening, and wherein a positioning protrusion is provided on the top plate that contacts the opening edge when the opening edge seal projection bend and deformed until contacting the cap body. The present invention provides the synthetic resin cap, a closing device having thereof, and a container-filled beverage.