Closure with vents for venting during molding of a liner, method of forming a liner in a closure, and device for forming a liner in a closure
View Patent ↗A closure device includes a top wall, a skirt depending from the top wall, and a plurality of pads arranged circumferentially on the top wall, the pads extending into a space formed by the top wall and the skirt, the spaced pads configured to vent gas between adjacent pairs of pads during molding of a liner material against the top wall. A method of forming a liner in a closure device includes applying a moldable material to a top wall of the closure device, engaging a face of a punch of a liner-molding device with pads arranged on the top wall, the pads extending into a space formed by the top wall and a skirt depending from the top wall, compressing the moldable material by the punch against the top wall to form the liner, and venting gas between adjacent pairs of pads during the compressing step.
1. A closure device, comprising:
a top wall;
a skirt depending from the top wall, the skirt having an inner wall;
a plurality of pads arranged circumferentially on the top wall, the pads extending into a space formed by the top wall and the skirt, the space being generally cylindrical with a central axis extending generally parallel to the skirt and generally perpendicular to the top wall, the pads having a first surface extending generally parallel to the axis for abutting an outer edge of a liner and a second surface having a first portion generally perpendicular to the first surface and configured to engage a face of an outer punch of a liner-molding device during compression of the liner material against the top wall by an axially movable inner punch of the liner-molding device and a second portion forming a transition with the inner wall of the skirt, and
spaces between the pads, the spaces being of a size sufficient to vent gas that would be trapped between the top wall and a liner-molding device during molding of a liner material against the top wall.
2. The closure device of claim 1 , wherein the face of the outer punch is essentially flat.
3. The closure device of claim 1 , wherein the pads are radially oriented on an inner surface of the top wall.
4. The closure device of claim 3 , wherein the inner surface of the top wall is circular.
5. The closure device of claim 1 , wherein the skirt includes threads configured to interact with a threaded portion of a container neck.
6. The closure device of claim 1 , further comprising a tamper indicating band arranged on the skirt.
7. The closure device of claim 1 , wherein the closure device is made of one of a rigid and semi-rigid material.
8. The closure device of claim 7 , wherein the material includes plastic.
9. The closure device of claim 7 , wherein the material includes polypropylene.
10. The closure device of claim 1 , wherein the closure device is constructed as a single piece.
11. The closure device of claim 1 , further including a liner abutting the top wall inner surface and the first surface of the pads.
12. The closure device of claim 11 , wherein the liner is formed from moldable material.
13. A closure device, comprising:
a top wall having an inner surface and an outer surface;
a skirt depending from the top wall, the skirt having an inner surface and an outer surface the top wall inner surface and the skirt inner surface forming a cavity having central axis generally perpendicular to the central portion of the top wall inner surface;
a plurality of pads arranged circumferentially on the top wall, the pads extending into the cavity; the pads having a first surface extending generally parallel to the axis for abutting an outer edge of a liner and a second surface having a first portion configured to engage a face of an outer punch of a liner-molding device during compression of the liner material against the top wall by an axially movable inner punch of the liner-molding device, the second surface having a first portion and a second portion, the first portion being generally perpendicular to the first surface, and the second portion forming a transition between the first portion and the inner wall of the skirt, and
spaces between the pads, the spaces being of a size sufficient to vent gas that would be trapped between the top wall and a liner-molding device during molding of a liner material against the top wall.
14. The closure device of claim 13 , further including a liner abutting the top wall inner surface and the first surface of the pads.
15. The closure device of claim 14 , wherein the liner is formed from moldable material.
16. The closure device of claim 13 , wherein the second portion extends from the first portion along a curve of about 90° to the skirt inner surface forming a transition between the first portion and the inner wall of the skirt.
17. The closure device of claim 13 , whereby the skirt inner surface is devoid of any protrusion extending over the first surface such that the inner punch can move axially from outside the closure into the closure to contact the first surface.