SNAP-ON SCREW-OFF CLOSURE

摘要

The present invention provides a closure with a thread configuration adapted for snap-on or screw-on application to a container neck finish. Preferably the closure and neck finish contain eight or nine mating continuous or discontinuous threads for this purpose. The present invention preferably provides at least one annular sealing bead depending from the outer surface of the closure valve which are compressed against the inner surface of the container neck to form a seal as the closure is snapped onto the container neck. Elevated areas extend upwardly from the tamper-evident band in spaced relation to the bottom edge of the closure body to support the tamper-evident band in resisting vertical movement imparted by insertion of the closure on the bottle neck, thereby protecting the frangible elements during assembly. At least one lug (18) optionally extends from the exterior wall of the container neck to facilitate breaking the frangible elements on the tamper-evident band of the closure by engaging the frangible elements (35) as the closure is twisted off the container neck following initial snap-on application.