Abstract: A pilfer-proof plastic cap for sealing containers. The cap comprises a cap body, a band member and an annular wall extending upwardly and radially inward from the band member. A plurality of stopper tabs formed in the annular wall is engagable with the threads of a threadably capped container. The stopper tabs have a saw-tooth shape including a mildly inclined leading surface for smooth engagement of the cap with the container threads. The band member is connected to the cap with breakable ridges to indicate tampering. The band itself contains a breakable ridge to ease removal of the band from the container.

Abstract: A pilfer-proof plastic cap of the type for sealing threadably capped containers. The cap comprises a cap body, a band member and an annular wall extending upwardly and radially inward from the band member. A plurality of stopper tabs formed in the annular wall is engagable with the threads of a threadably capped container. The stopper tabs have a saw-tooth shape including a mildly inclined leading surface for smooth engagement of the cap with the container threads. The band member is connected to the cap with breakable bridges to indicate tampering. The band itself contains a breakable bridge to ease removal of the band from the container.

Abstract: A pilfer-proof cap made of synthetic resins capable of preventing at least a rotation of a packing together with a cap in a simple construction when said cap is removed and holding a sealed-up tightness of a container until a bridge is broken is provided.A cap, in which a top wall and a skirt depending from said top wall are comprised and a threaded portion of the cap screwed in a threaded portion of the container is provided, a plurality of bridges, a packing provided so as to seal up tightly a mouth portion of container during the time when said cap is closed, a packing guide, a circular inner sealing member tightly insertable into an inner surface of said mouth portion of container provided in said packing and an air reservoir formed in an upper surface of the packing are comprised.