Patent ID: 6164503
Filing Date: 2000-12-26
Classification: B65D

Abstract:
An injection molded thermoplastic screw-on dispensing cap comprising an internally threaded skirt, an end wall integral with the upper end of the skirt, a dispensing aperture in the end wall, a member for selectively opening and closing the aperture to respectively allow or prevent dispensing of the contents of a bottle on which the cap is threaded, the end wall including an annular sealing surface having a radial width that is about the same size as a nominal wall thickness of the cap and being adapted to overlie an edge of a mouth of the bottle, the sealing surface being generally convex across its radial width, the sealing surface having the general shape of a truncated torroid and having sufficient mass and heat transfer characteristics to resist substantial permanent deformation during an induction heating process while it presses an induction seal liner carried in the cap onto the edge of the mouth of a bottle and its convex shape forms a line contact circumferentially continuous seal with the edge of the mouth of the bottle when the liner is removed and the cap is reinstalled to ensure a drip resistant seal therewith upon application of moderate reclosing torque.