Widemouth jar neck and plastic cap construction

Abstract

A widemouth (e.g. 120 mm) jar preferably of plastic material has a neck having a flexible in-turned flange at its upper end and two vertically spaced, horizontal inward-formed beads with two outward-downward conical surfaces above and below the lower inward-formed beads. The cap has a top disk with a depending short inner skirt having a tapered edge and an elongated peripheral skirt. The peripheral skirt has in consecutive order proceeding downward an upper cylindrical portion, an upper internal bead, a circumferential internal weakening groove, a lower locking bead and a slanted ramp. The in-turned flange of the neck is compressed between the two cap skirts, the upper internal bead seats against the upper conical surface and the locking bead seats in the lower inward-formed bead of the neck. Thus a product and air-tight multi-zone seal is effected; and, further, once seated the cap is tamper-proof in that it must be torn to be removed. To tear the cap, a tear tab depends from the skirt and two upward slanted internal weakening grooves are formed to either side of the tear tab connecting to the circumferential weakening groove. The portion of the cap above the groove is used for reclosure and may be lifted by a second tab depending from the cap skirt adjacent the tear tab.