Abstract: In a tamper-evident screw-threaded closure of the kind in which the skirt of a cap is joined at its lower edge to a band by integral elongated breakable webs the webs are associated with co-operating teeth and notches that drive the band during the screwing-on step, the web extending from the root of the tooth to the adjacent wall of the notch in an inclined direction such as to flex or pivot and allow relative movement between the cap and band during this step without breaking, and the band has lugs which oppose circumferential, rather than axial, movement in the unscrewing direction.

Abstract: A re-closable tamper-proof closure assembly for containers comprises a cap with a tamper-proof strip attached to the skirt of the cap by a breakable web but the strip is free of any tabs graspable by the user's hand, and is broken away from the cap simply by the act of removing the cap by pushing upwards on a stout lug. There may be a gap in the web already in the region of the lug, and at the opposite side of the cap the skirt is extended downwards to form a tongue between the ends of the strip. There can be a bead on the container neck for snap engagement of the cap on re-use, in addition to the bead engaged by the tamper-proof strip.