Tearable skirt plastic water bottle cap

Abstract

A plastic bottle cap for large capacity water bottles has a central disc with a depending skirt which fits snugly around the exterior of the bottle neck and, so long as it remains intact, prevents tampering with the contents. The lower part of the skirt is scored and provided with a pull tab so that it may be partially torn off, permitting removal of the cap from the bottle neck. The score line slants upwardly from the bottom edge of the skirt to a circumferential score line extending only part way around the cap and located slightly below the maximum diameter area of the external bead of the cap which is installed over the external bead on the bottle neck. A pair of internal, thin, flexible circumferential rings are formed in the cap immediately above the score line and at about said maximum diameter to engage the neck bead and prevent leakage. In one form of the invention, the skirt is internally tapered to facilitate installation of the cap. In this form, the bottle neck has a flat shoulder on which the bottom edge of the cap skirt rests, inhibiting dust and other contaminants from penetrating under the skirt.