Patent ID: 7867425

Claim:
A method of making a closure that includes the steps of: (a) providing a shell having a base wall with a skirt for securement to a container finish and a circumferentially continuous lip that extends radially inwardly from said skirt at a position adjacent to and spaced from said base wall, such that there is an open space between said base wall, said skirt, and said lip, (b) compression molding a sealing liner against said base wall, and between said base wall and said lip, by (b1) placing liner material within said shell, (b2) engaging said lip with a sleeve to form a mold cavity, and (b3) engaging the liner material with a tip to force the liner material radially outwardly within said cavity beneath said sleeve and into said open space between said base wall, said skirt and said lip, and (c) providing a plurality of vent openings in said lip so that air within said cavity can escape during said step (b) through said vent openings beneath said sleeve wherein said vent openings comprise channels that open at a radially inner edge of said lip and at surfaces of said lip axially spaced from said base wall.