Patent ID: 6298554
Filing Date: 2001-10-09
Classification: B65D,Y10T

Abstract:
A method of making a valve for a self-sealing dispensing closure that comprises the steps of:(a) forming a valve element of one-piece integrally molded elastic composition having an annular base, a web portion that extends radially inwardly from said base, a mouth portion that extends axially from an inner periphery of said web portion to a circular opening coaxial with said base, and a diametrically split lip that extends axially inwardly from said surrounding said opening, and(b) axially inverting said web and mouth portions of said valve element such that said split lip forms opposed diametrically extending external ribs that configure said opening as a diametric slit between said ribs, and said web portion is internally stressed to bias said slit closed.