A container having a neck formed with external shoulders and grooves below the shoulders is closed by a plastic cap having a depending skirt formed with interrupted internal beads which lock under the neck shoulders and are received in the neck grooves. A circumferential scoreline is formed in the skirt above the lower bead and is connected to a second scoreline which extends down to the lower edge of the skirt. Adjoining the terminus of the second scoreline is a tab which may be gripped and pulled to tear the skirt upward along the second scoreline and then circumferentially around the first scoreline to remove the lower part of the skirt and make it possible to remove the remaining portion of the cap. The improvement consists in making the bead sections in various truncated conical shapes distributed in various patterns. These shapes facilitate application of the cap to the neck without splitting the former or crushing the latter. The conical shapes may be circular or elliptical in cross-section and may be aligned or staggered.

To prevent tampering with the contents of containers, the neck of the container is formed with external beads with grooves under the lower surfaces of the beads. The cap has an outer skirt formed with internal beads which lock under the shoulders of the neck beads. Preferably, the cap has an inner skirt which seals against the inside of the container neck. To remove the cap, a score-line is formed extending upward from the bottom edge of the skirt and merging with a horizontal scoreline located between the two internal beads, so that one may grip a tab on the lower edge of the skirt, pull upward on the substantially vertically section and thence horizontally around the horizontal scoreline. Unless the skirt is thus torn, it cannot be removed from the neck and tearing of the skirt indicates tampering with the contents of the container. In the present invention, instead of the horizontal scoreline continuing around the periphery of the cap, it terminates at an unscored area which connects the upper and lower portions of the skirt. The lower portion of the skirt may be gripped by the user as an auxiliary means of removing the cap. The primary means of removing the cap is a flange which extends outward from the top of the cap skirt and may be gripped by the finger and/or thumb to pull the cap off the neck.

A commercially available seal disc of foil or thin plastic is inserted in a temper-evident plastic bottle cap prior to its being applied to a container neck. The cap has an internal, horizontal upper locking bead as well as a lower locking bead which lock under shoulders on the neck of the container. Inward-extending lugs are formed projecting inward of the upper locking beads to augment the bead sections in retaining the seal disc inside the cap. When the cap is applied to the container neck, the seal disc adheres to the container neck. Neither the internal cap beads nor the lugs interfere with retention of the disc on the neck as the cap is removed.

Plastic bottle caps of the snap-on type having tamper indicating means such as a tear band. The top wall of the top overhangs its side wall and the overhanging lip is filleted at an angle of about 30.degree. to increase the difficulty of removing the cap by hand without visibly affecting the tamper indicating means. Also, the cap has interior interrupted beads for snapping over the shoulder of the bottle neck and has ribs in the interruptions for adjusting the magnitude of the snap-on and snap-off forces. The cap is molded on a core having grooves for forming the beads and ribs. The cap may have a non-resilient gasket and a dished top so that it can exert pressure on the gasket. A foil seal having adhesive on one surface may underlie the gasket. After the cap has been applied to the bottle neck, the foil seal may be caused to adhere to the bottle neck.

A cap for a wide-mouth container has a short inner skirt and a longer outer skirt. The outer skirt has upper and lower internal locking beads which are preferably interrupted with gaps between bead sections. Above the lower locking bead is a circumferential score line. A portion of the outer skirt below the score line is cut away in a horizontal and then an arcuate slit to form a pull tab extending parallel to the score line. The pull tab is joined to the outer skirt by a frangible link. Various locations of said link are disclosed. The container neck is thin walled, having an internal top flange terminating in a first sealing surface which bears against the top of the inner skirt, a groove below the last-mentioned surface and a second sealing surface below the groove which also bears against the inner skirt. The neck also has upper and lower external beads each having shoulders on their lower edges under which the upper and lower internal locking beads of the cap seat. The neck curves outward in a lower shoulder immediately below the bottom edge of the skirt. The cap cannot be pried off with the fingers until the user grips the tab and tears off the portion of the outer skirt below the score line.