A bottle cap which reliably seals a bottle at high and low temperatures and which nevertheless can easily be removed by hand without a tool. The cap is made of two parts: An outer cap member of hard plastic material and a sealing insert of soft plastic material. In the closed position the outer cap member is fixed against the inner sealing member by means of a detachable opening ring, which firmly holds the sealing insert clinging to the bottle opening.

A tear open bottle cap comprises a top planar disk 2, a cylindrical skirt 1 depending downwardly therefrom, a slant score line 9 extending upwardly from the lower edge of the skirt, a pull tab 7 projecting downwardly from the lower edge of the skirt at the score line, and an inner bead 4 extending around the circumference of the skirt and spaced from the lower end thereof to engage an upper bead of the bottle neck. The score line crosses the inner bead and has severable transverse partition walls 21, 22. A plurality of vertical, radially inwardly directed lugs 6 project from the corner 3 between the disk and skirt and have slant lower edges 11 for engaging the upper bead of the bottle neck. A circumferential internal rib 5 on the disk abuts the upper edge of the bottle neck to act as a shock absorber, together with the lugs 6.

A container and closure assembly wherein the container is adapted to be initially closed by a sealing means such as a vacuum disc. The closure has two positions of attachment to a bead encircling the container. In the first position of attachment, which accommodates the aforementioned sealing means, the container bead is engaged in an annular notch located in the inside wall of a closure skirt. The notch weakens the skirt so as to allow a distal end of the skirt to be torn from a remaining portion of the closure to free the remaining portion of the closure from attachment to the container bead. This exposes the sealing means so as to allow a removal thereof and access to the contents of the container. The remaining portion of the closure is then reattachable to the container bead at a second position of attachment rendered accessible by removal of the sealing means for reclosure of the container. In a first embodiment, the closure has retention ribs permitting preassembly of the sealing means to the closure. In a modification, the retention means comprises an inwardly directed skirt bead sized to retain the sealing means.

The package is formed of a casing (1) and a closure cap (6). A guarantee ring (7) is connected to the closure plug (6) via tear webs (8). The casing comprises an annular bead (3) beyond which is pressed the guarantee ring (7). A cap-like part (21) of the closure plug (6) has an inwardly protruding annular rim (12). The distance (b) of this annular rim (12) from the bottom of the closure plug is greater than the distance (a) of the annular bead from the edge (2) of the casing. Thus, the guarantee ring (7) as well as the inwardly protruding annular rim (12) can be pressed beyond the annular bead (3). On opening the closure plug, the guarantee ring (7) is torn off the closure plug, but, when again closing the closure plug (6), the closure plug (6) is secured in its closed position by the inwardly protruding annular rim, the inner diameter (13) of which is greater than the inner diameter (9) of the guarantee ring (7).

In combination, a container and a linerless cap and a method of forming the cap. In the method the cap is molded from plastic and includes a top wall, an outer depending skirt and an internal depending substantially annular wall having an upper end integral with and depending from the top wall and a lower free end. Thereafter the free end is engaged by a curling tool to progressively turn the free end away from the internal wall to curve the free end into a curvilinear compressible and resilient free end adapted to be engaged for sealing. The engageable free end of the seal can have a coil, O, U, J or quarter round cross sectional shape and can be a rim, plug or corner seal.