Patent Application
20180050379
The disclosed concept relates generally to containers and, more particularly, to can ends or shells for metal containers such as, for example, beer or beverage cans, as well as food cans. The disclosed concept also relates to methods and tooling for selectively forming a can end or shell to reduce the amount of material used therein.
Metallic containers (e.g., cans) for holding products such as, for example, food and beverages, are typically provided with an easy open can end on which a pull tab is attached (e.g., without limitation, riveted) to a tear strip or severable panel. The severable panel is defined by a scoreline in the exterior surface (e.g., public side) of the can end. The pull tab is structured to be lifted and/or pulled to sever the scoreline and deflect and/or remove the severable panel, thereby creating an opening for dispensing the contents of the can.
When the can end is made, it originates as a can end shell, which is formed from a sheet metal product (e.g., without limitation, sheet aluminum; sheet steel). The shell is then conveyed to a conversion press, which has a number of successive tool stations. As the shell advances from one tool station to the next, conversion operations such as, for example and without limitation, rivet forming, paneling, scoring, embossing, tab securing and tab staking, are performed until the shell is fully converted into the desired can end and is discharged from the press.
In the can making industry, large volumes of metal are required in order to manufacture a considerable number of cans. Thus, an ongoing objective in the industry is to reduce the amount of metal that is consumed. Efforts are constantly being made, therefore, to reduce the thickness or gauge (sometimes referred to as “down-gauging”) of the stock material from which can ends and can bodies are made. However, as less material (e.g., thinner gauge) is used, problems arise that require the development of unique solutions. Thus, there is a constant desire in the industry to reduce the gauge, and thus the amount, of material used to form such containers. However, among other disadvantages associated with the formation of can ends from relatively thin gauge material, is the tendency of the can end to wrinkle, for example, due to pressure produced from the from the product contained in the can to which the can end is attached, such as pressure produced from a carbonated beverage or pressures that result from the sterilization or pasteurization processes involved in food and/or beverage applications.
There is, therefore, room for improvement in containers such as beer/beverage cans and food cans, as well as in selectively formed can ends or shells and tooling and methods for providing such can ends or shells.
These needs and others are met by embodiments of the disclosed concept, which are directed to a method of forming a can end shell, a tool assembly to reform a can end shell, and a can end shell.
As one aspect of the disclosed concept, a method of forming a can end shell includes providing a can end shell having a central panel portion, a first panel radius around the central panel portion, a chamfer extending from the first panel radius, and a second panel radius around the chamfer, coining the can end shell to form a coined section in the first panel radius around at least a portion of the circumference of the central panel portion, and reforming the can end shell to form a step in the chamfer.
As another aspect of the disclosed concept, a tool assembly is provided to reform a can end shell having a central panel portion, a first panel radius around the central panel portion, a chamfer extending from the first panel radius, and a second panel radius around the chamfer. The tooling assembly includes a coining tool assembly including a coining tool having an angled section structured to form a coined section in the first panel radius around at least a portion of the circumference of the central panel portion during a coining operation, and a reforming tool assembly including a reforming tool having a reforming section structured to form a step in the chamfer during a reforming operation.
As another aspect of the disclosed concept, a can end shell includes a central panel portion, a first panel radius around the central panel portion, a chamfer extending from the first panel radius, a second panel radius around the chamfer, a coined section formed in the first panel radius around at least a portion of the circumference of the central panel portion, and a step formed in the chamfer.
A full understanding of the disclosed concept can be gained from the following description of the preferred embodiments when read in conjunction with the accompanying drawings in which:
For purposes of illustration, embodiments of the disclosed concept will be described as applied to shells, although it will become apparent that they could also be employed to suitably strengthen the panel portion of any known or suitable can end (e.g., without limitation, beverage/beer can ends; food can ends).
It will be appreciated that the specific elements illustrated in the figures herein and described in the following specification are simply exemplary embodiments of the disclosed concept, which are provided as non-limiting examples solely for the purpose of illustration. Therefore, specific dimensions, orientations and other physical characteristics related to the embodiments disclosed herein are not to be considered limiting on the scope of the disclosed concept.
Directional phrases used herein, such as, for example, left, right, front, back, top, bottom, upper, lower and derivatives thereof, relate to the orientation of the elements shown in the drawings and are not limiting upon the claims unless expressly recited therein.
As employed herein, the terms “can” and “container” are used substantially interchangeably to refer to any known or suitable container, which is structured to contain a substance (e.g., without limitation, liquid; food; any other suitable substance), and expressly includes, but is not limited to, beverage cans, such as beer and soda cans, as well as food cans.
As employed herein, the term “can end” refers to the lid or closure that is structured to be coupled to a can, in order to seal the can.
As employed herein, the term “can end shell” is used substantially interchangeably with the term “can end.” The “can end shell” or simply the “shell” is the member that is acted upon and is converted by the disclosed tooling to provide the desired can end.
As employed herein, the statement that two or more parts are “coupled” together shall mean that the parts are joined together either directly or joined through one or more intermediate parts.
As employed herein, the term “number” shall mean one or an integer greater than one (i.e., a plurality).
The can end shell 10 has an interior surface adapted for exposure to the contents of the container and an exterior surface for exposure to the environment. The can end shell 10 can be formed, for example and without limitation, of sheet metal such as an aluminum alloy. In one non-limiting embodiment, an aluminum alloy is used to form the can end shell 10 and the gauge of the aluminum alloy is in a range of, for example and without limitation, about 0.0082 to about 0.013 inches. It will be appreciated, however, that the disclosed concept can be employed with any known or suitable gauge of material with respect to any known or suitable type and/or configuration of shell or can end. The can end shell 10 may also be formed of any other suitable materials such as steel, tinplate, polymer-aluminum laminates, and composite materials without departing from the scope of the disclosed concept.
The chamfer 13 is formed at an angle θ with respect to the central panel portion 11. In one non-limiting embodiment, the angle θ is about 45°. In another non-limiting embodiment, the angle θ is within a range of about 30° to about 60°. However, it is appreciated that the angle θ can have any value without departing from the scope of the disclosed concept.
The coining tool 30 has an angled section 31 that, when pressed against the can end shell 10 in the coining operation shown in
The coining tool 30 further includes a first elongated portion 32. The first elongated portion 32 is structured to be seated in the countersink 16 during the coining operation shown in
The upper coining support tool 40 and lower coining support tool 50 support the can end shell 10 while it is being coined. That is, the upper coining support tool 40 includes a first flat portion 41 that is structured to abut against an upper side of the central panel portion 11 during the coining operation shown in
In the coining operation, the can end shell 10 may be carried from station to station by a belt in a manner well known in the art. The belt (not shown) carries the can end shell 10 to the coining tool assembly shown in
Coining the first panel radius 12 cold works the metal in the coined area and thereby strengthens the first panel radius 12, which in turn makes the can end shell 10 more resistant to buckling, for example, from pressure within the container to which the can end shell 10 is eventually attached. Coining the first panel radius 12 also produces increased surface area of metal in the can end shell 10. However, coining the first panel radius 12 also produces loose or slack metal, which is undesirable.
After the coining operation, the can end shell 10 is transferred to a reforming tool assembly, as illustrated in
The reforming tool assembly includes a reforming tool 60 and a reforming support assembly including an upper reforming support tool 70 and a lower reforming support tool 80. While two upper tools and one lower tool are illustrated in
The reforming tool 60 includes a reforming section 61 that, when pressed against the chamfer 13 during the reforming operation shown in
The reforming tool 60 also includes a second elongated portion 62. The second elongated portion 62 is structured to be seated in the countersink 16 during the reforming operation. In some embodiments the second elongated portion 62, like the first elongated portion 32 of the coining tool 30, may also be used to reform the can end shell 10, for example and without limitation, to deepen the countersink 16 and/or modify the shape of the panel wall 15 and/or chuckwall 17, for example by making them substantially vertical.
The upper reforming support tool 70 and the lower reforming support tool 80 support the can end shell 10 when the step 19 is being formed. To this end, the upper reforming tool 70 includes a third flat portion 71 and the lower reforming tool 80 includes a first step section 81 and a second step section 82. The first step section 81 supports a lower end of the chamfer 13 and the second step section 82 supports an upper end of the chamfer 13 during the reforming operation shown in
The formation of the step 19 in the chamfer 13 utilizes excess or loose metal which may have been produced when the can end shell 10 was coined as shown in
It will be appreciated that the coining and reforming processes depicted in
It will be appreciated that the can end shells 10 and 110 depicted in
In accordance with the disclosed concept, formation of a can end generally involves a process of up to eight or more formation steps, a non-limiting example of which is depicted in
In one non-limiting embodiment, a coining process depicted for example in
While specific embodiments of the disclosed concept have been described in detail, it will be appreciated by those skilled in the art that various modifications and alternatives to those details could be developed in light of the overall teachings of the disclosure. Accordingly, the particular arrangements disclosed are meant to be illustrative only and not limiting as to the scope of the disclosed concept which is to be given the full breadth of the claims appended and any and all equivalents thereof.
This patent application claims the priority benefit under 35 U.S.C. §119(e) of U.S. Utility patent application Ser. No. 14/055,965 filed on Oct. 17, 2013, and entitled, “END CLOSURE WITH COINED PANEL RADIUS AND REFORM STEP”; and U.S. Provisional Application No. 61/715,461 filed on Oct. 18, 2012, and entitled, “END CLOSURE WITH COINED PANEL RADIUS AND REFORM STEP,” the contents of which are hereby incorporated herein by reference.
| Number | Date | Country | |
|---|---|---|---|
| 61715461 | Oct 2012 | US |
| Number | Date | Country | |
|---|---|---|---|
| Parent | 14055965 | Oct 2013 | US |
| Child | 15799199 | US |
