Closure with liner seal vents
AssigneeRexam Closure Systems Inc.
InventorJoseph Major
Life of this patent
Estimating the term…
Abstract
A plastic closure includes a shell having a base wall with a skirt for securement to a container finish and a lip that extends radially inwardly from the skirt at a position adjacent to and spaced from the base wall. A liner is compression molded in situ against the base wall, and between the base wall and the lip. The lip has a plurality of circumferentially spaced passages that extend through the lip for venting air during compression molding of the liner.
Claims17
A closure shell that includes a base wall with a skirt for securement to a container finish, a lip that extends radially inwardly from said skirt at a position adjacent to and spaced from said base wall, and at least one passage that extends through said lip.
The plastic closure that includes:
- a shell having a base wall with a skirt for securement to a container finish and a lip that extends radially inwardly from said skirt at a position adjacent to and spaced from said base wall, and
- a liner compression molded in situ against said base wall, and between said base wall and said lip,
- said lip having a plurality of circumferentially spaced passages that extend through said lip for venting air during compression molding of said liner.
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 lip that extends radially inwardly from said skirt at a position adjacent to and spaced from said base wall,
- (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 beneath said lip, and
- (c) providing a plurality of vent openings in said lip so that air within said cavity can escape through said vent openings beneath said sleeve.
Dependencies are inferred from the claim text.