Beverage can having a grommet

Patent metadata

Field	Value
Publication number	US-10865036-B2
Application number	US-201816224928-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Apr 21, 2016
Publication date	Dec 15, 2020
Grant date	Dec 15, 2020

Abstract

A drawn and wall ironed beverage can body, method for forming same, and a sealed and filled can, include a through-hole or aperture in the base. A grommet for charging a propellant in can is located in the aperture. The aperture has a burr that is located on the inboard side of the rim of the aperture. A method of forming a valve in the drawn and ironed beverage can body includes positioning a first tool in an interior of the can body, contacting an exterior surface of the base with a second tool such that the first and second tools are aligned, forming the aperture in the base, and inserting the grommet into the aperture.

First claim

What is claimed:

1. A method of forming a valve in a drawn and ironed beverage can body, the method comprising:
in a one-piece, drawn and ironed beverage can body that includes a dome in a base, a foot outboard of the base, and an elongate ironed sidewall extending upwardly from the foot, the dome having an aperture therethrough and a wall about the aperture that terminates in a rim, the rim having an inboard side and an outboard side, wherein the inboard side is radially inward relative to the outboard side with respect to the aperture,
positioning a first tool in an interior of the can body, the first tool contacting an interior surface of the dome;
contacting an exterior surface of the dome with a second tool such that the first and second tools are aligned;
forming the aperture in the dome by the contacting steps of the first and second tools such that a burr is formed on the inboard side of the rim of the aperture; and
inserting a grommet into the aperture, such that the burr is inwardly oriented relative to the grommet.

2. The method of claim 1 further comprising deforming a portion of the dome adjacent the aperture to form an upstanding wall.

3. The method of claim 2 wherein the deforming step occurs at the same time as the forming step and before the inserting step.

4. The method of claim 2 wherein the upstanding wall is vertical or nearly vertical.

5. The method of claim 2 wherein the upstanding wall is circumferential about the aperture.

6. The method of claim 2 wherein the dome is recess-less about the upstanding wall such that the base of the grommet is not recessed relative to the dome.

7. The method of claim 2 wherein the dome has a recess about the upstanding wall such that the base of the grommet is recessed relative to the dome.

8. The method of claim 2 wherein the upstanding wall terminates at a rim surface that forms an angle A relative to a horizontal reference line that is between −30 degrees and 60 degrees.

9. The method of claim 8 wherein angle A is between zero and 45 degrees.

10. The method of claim 8 wherein angle A is between 5 and 40 degrees.

11. The method of claim 1 wherein the burr contacts the grommet.

12. The method of claim 1 wherein the grommet, after the inserting step, includes a base located on the outboard side of the dome, a crown located on the inboard side of the dome, and a neck between the base and the dome for receiving the rim of the aperture.

13. The method of claim 1 wherein the burr contacts a neck of the grommet after the inserting step when the grommet is in its sealing state.

14. The method of claim 1 wherein the grommet is adapted for contacting a liquid product after seaming and filling steps.

Assignees

• Crown Packaging Technology Inc

Inventors

• Golding Richard Mark Orlando

Classifications

• B21D51/38 Primary

  Making inlet or outlet arrangements of cans, tins, baths, bottles, or other vessels; Making can ends; Making closures · CPC title

• B21D28/28

  in tubes or other hollow bodies · CPC title

• B65D1/165

  Cylindrical cans · CPC title

• B65D83/38

  Details of the container body (pressure relief devices B65D83/70) · CPC title

• B65D1/20

  characterised by location or arrangement of filling or discharge apertures · CPC title