Abstract: The tear-off guarantee strip (6) of the closure cap (1) has a peripheral detent edge portion (9) whose inside diameter is smaller than the outside diameter of a peripheral projection (8) on the mouth (3) of a container. In addition to the detent edge portion (9), provided on the inside (7) of the guarantee strip are at least one holding projection (10) and a bead (26), which both strengthen the effect of the detent edge portion (9). The combination of detent edge portion, holding projections and bead gives optimum results in regard to the function of the guarantee strip and the possibility of removing the closure cap from molding tools which open in an axial direction.

Abstract: In a closure cap (1) of thermoplastic material, produced by an injection moulding process, the guarantee strip (2) which is formed integrally thereon is provided, at the lower edge (2) of the closure cap, on the outside (6), with a reinforcement portion (5) which is disposed between two desired-rupture connecting web portions (3). Besides the advantages, which are already known, of a reinforcement portion on the guarantee strip, the reinforcement portion according to the invention serves as a support for bearing against the moulding tool in order to prevent stretching of the connecting web portions (3) or deformation of the guarantee strip (2) when the cap is removed from the mould.