CAN END WITH RETORT RESISTANT PANEL, AND TOOLING AND ASSOCIATED METHOD FOR PROVIDING SAME
A method of making a can end, which includes a recessed panel defined by an upwardly extending chuck wall, a peripheral scoreline disposed in a public side of the panel proximate to the base of the chuck wall, a tab fastened to the panel by a rivet, includes the step of employing tooling to form a pressure resistance bead extends around the panel inboard of the peripheral scoreline and outboard of the rivet. The tooling forms a saw tooth panel formation proximate to the pressure resistance bead inboard of the pressure resistance bead. Among other benefits, the pressure resistance bead and saw tooth panel formation created by the tooling and method combine to resist wrinkling or other undesired deformation of the can end.
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This application is a division of application Ser. No. 14/176,337, filed Feb. 10, 2014, and entitled “CAN END WITH RETORT RESISTANT PANEL, AND TOOLING AND ASSOCIATED METHOD FOR PROVIDING SAME”; which is a division of application Ser. No. 12/906,463, filed Oct. 18, 2010, and entitled “CAN END WITH RETORT RESISTANT PANEL, AND TOOLING AND ASSOCIATED METHOD FOR PROVIDING SAME”, now U.S. Pat. No. 8,684,211, the contents of which are incorporated herein by reference.
BACKGROUNDField
The disclosed concept relates generally to containers and, more particularly, to can ends having retort resistant end panels. The disclosed concept also relates to tooling and associated methods for providing such can ends.
Background Information
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, 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, tabs, and can bodies are made. However, as less material (e.g., thinner gauge) is used, problems arise that require the development of unique solutions. By way of example, a common problem associated with can ends for food cans is that they are subject to pressure changes associated with processing the food product within the can. More specifically, substances (e.g., without limitation, liquid; food; any other suitable substance) are commonly packaged in vacuum sealed cans. For example, a typical process for vacuum packaging food in metal cans includes filling the cans with uncooked food, sealing the can end or lid on the can and placing the can into an oven. This process is referred to as a retort process. As the food is cooked, pressure builds within the can. Then the can is cooled. Thus, the retort process induces internal (i.e., positive) pressure, followed by external (i.e., negative) pressure. The combination of the internal and external pressures induces stress on the end panel of the can end. Accordingly, for can ends and shell designs made from material having a reduced gauge or reduced blank size, such pressures and stresses tend to cause the end panel to permanently deform and/or wrinkle.
There is, therefore, room for improvement in can ends, and in tooling and methods for providing such can ends.
SUMMARYThese needs and others are met by embodiments of the disclosed concept, which are directed to a can end having a retort resistant panel, and tooling and methods for providing such can ends. Among other benefits, the unique design of the can end provides increased strength and resistance to undesirable deformation (e.g., without limitation, wrinkling) of the can end panel caused, for example, by the pressures associated with the retort cooking process, without requiring an increase in the thickness or gauge of the stock material from which the can end is made or an undesirable increase in the depth of the can end panel.
As one aspect of the disclosed concept, a can end is provided, which is structured to be affixed to a can. The can end comprises: a recessed panel defined by an upwardly extending chuck wall, the panel having a product side structured to face toward the interior of the can, and a public side disposed opposite the product side; a peripheral scoreline disposed in the public side of the panel proximate to the base of the chuck wall; a tab fastened to the panel by a rivet, the tab being operable to sever the peripheral scoreline and open the can end; a pressure resistance bead extending around the panel inboard of the peripheral scoreline and outboard of the rivet; and a saw tooth panel formation disposed proximate to the pressure resistance bead inboard of the pressure resistance bead.
The panel may include a planar portion inboard of the saw tooth panel formation, wherein the planar portion has a depth. The saw tooth panel formation may comprise a plurality of bends and a drape defined by the distance between a first one of the bends and a second adjacent one of the bends. The ratio of the depth of the panel to the drape may be from about 1:1 to about 1:4. The saw tooth panel formation may further comprise a peak, and the drape may be symmetrical on opposing sides of the peak. The saw tooth panel formation may begin proximate to one side of the tab, extend around the panel inboard of the pressure resistance bead, and end proximate to the opposite side of the tab.
Tooling and a method for making the aforementioned can end are also disclosed.
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:
The specific elements illustrated in the drawings and described herein are simply exemplary embodiments of the disclosed concept. Accordingly, 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.
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, food cans, as well as beverage cans, such as beer and soda 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 used herein, the term “pull tab” or “tab” refers to an opening device (e.g., opener) made from generally rigid material that has undergone one or more forming and/or tooling operations, and which is structured to be suitably affixed to a can end for the purpose of being pivoted to sever a score line and open at least a portion of the 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).
Continuing to refer to
As previously noted hereinabove with respect to
Turning again to
The can end 100 also includes a flange 144, which extends outwardly from the top of the chuck wall 104, and is structured to be suitably seamed to side walls 202,204 (partially shown in phantom line drawing in
The pressure resistance bead 116 and saw tooth panel formation 118, also interchangeably refer to as a “flat” panel design because the overall height of the panel 102 does not change, will now be described in greater detail. Specifically, the pressure resistance bead 116 functions, in large part, to resist wrinkling or other deformation during the positive pressure portion of the retort cooking process cycle, and the saw tooth panel formation 118 or flat panel design, functions, in large part, to resist panel deformation during the negative pressure portion of the retort cooking process cycle. The pressure resistance bead 116 and saw tooth panel formation 118 are perhaps best shown in the enlarged section view of
It will be appreciated that the non-limiting example pressure resistance bead 116 shown and described herein is provided solely for purposes of illustration and is not intended to limit the scope of the disclosed concept. For example, the bead 116 could be disposed at another suitable location on the end 100 and/or could have a different shape and/or geometry, without departing from the scope of the disclosed concept. The example pressure resistance bead 116 is a downbead. That is, it extends inwardly from the public side 108 of the can end panel 102, or outwardly from the product side 106 of the panel 102, as shown in
The geometry of the saw tooth panel formation 118, is also important to provide retort resistance. Among other unique features, the disclosed saw tooth panel formation 118 preferably includes a plurality of bends 128,130,132,134 (best shown in the side elevation sectional views of
It will be appreciated that the saw tooth panel formation 118 is preferably located proximate to the pressure resistance bead 116 on the outer portion of the can end 100, towards the perimeter thereof. In the example shown and described herein, the saw tooth panel formation 116 begins proximate to one side 140 of the tab 112, extends around the panel 102 inboard of the pressure resistance bead 116, and ends proximate to the opposite side 142 of the tab 112, as shown in
Tooling 300 and associated methods for making the can end 100 will now be described with reference to
In accordance with the disclosed concept, forming the can ends 100 including pressure resistance bead 116 and saw tooth panel formation 118 generally involves up to six or more forming steps, a non-limiting example of which is sequentially depicted in
The tooling assembly 400 for forming the pressure resistance bead 116 is further illustrated in
The second tooling assembly 500 includes a first tool 502 and a second tool 504 disposed opposite from the first tool 502 and structured to cooperate with the first tool 502 to form the saw tooth panel formation 118 proximate to the pressure resistance bead 116. The first tool 502 of the example second tool assembly 500 includes a forming member 506 having a projection 508, a first planar portion 510 disposed on one side of the projection 508, and a second planar portion 512 disposed on the opposite side of the projection 508, as shown in
In this manner, a plurality of bends 128,130,132,134 are formed in the panel 102 of the can end 100 to form the desired saw tooth panel formation 118. More specifically, the first member 514 includes first and second opposing sides 518,520, and the second tool 504 includes a second member 522 movably disposed on the first side 518, and a third member 524 movably disposed on the second side 520. The first tool 502 further includes a supporting member 526 movably disposed beside the forming member 506. The supporting member 526 includes a shoulder 528, as shown. Accordingly, as illustrated in
Accordingly, the disclosed concept provides a can end 100 having an entirely different end panel design for resisting wrinkling or other deformation caused, for example and without limitation, by pressures and stresses associated with the retort cooking process. Specifically, the can end panel 102 incorporates a pressure resistance bead 116 and a unique saw tooth panel formation 118, to distribute and accommodate the positive and negative pressures and associated stresses caused by the retort process. Thus, a cost-effective can end 100 is provided, which can be produced using a minimal amount of material (e.g., without limitation, sheet metal) while affording enhanced resistance to undesirable permanent deformation.
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
Claims
1. A method for providing a can end, the method comprising:
- providing a recessed panel defined by an upwardly extending chuck wall, the panel having a product side, a public side disposed opposite the product side, a peripheral scoreline disposed in the public side of the panel at or about the base of the chuck wall, and a rivet;
- forming a pressure resistance bead in the panel, the pressure resistance bead extending around the panel inboard of the peripheral scoreline and outboard of the rivet; and
- forming a saw tooth panel formation proximate to the pressure resistance bead.
2. The method of claim 1, further comprising the panel having a planar portion disposed between the pressure resistance bead and the saw tooth panel formation.
3. The method of claim 1, further comprising the panel having an annular countersink extending upwardly and inwardly from the base of the chuck wall toward the peripheral scoreline.
4. The method of claim 1, further comprising the pressure resistance bead being a downbead extending inwardly from the public side of the panel and outwardly from the product side of the panel.
5. The method of claim 1, further comprising staking the rivet to fasten a tab to the panel.
6. The method of claim 5, further comprising the tab including a nose portion and a lift portion disposed opposite and distal from the nose portion; and wherein the pressure resistance bead passes beneath the nose portion.
7. The method of claim 5, further comprising the saw tooth panel formation beginning proximate to one side of the tab, extending around the panel inboard of the pressure resistance bead, and ending proximate to the opposite side of the tab.
8. The method of claim 1, further comprising:
- providing a tool assembly including a first tool and a second tool disposed opposite the first tool; and
- forming the pressure resistance bead by having the first tool cooperate with the second tool.
9. The method of claim 8 wherein the first tool comprises a first planar portion, a second planar portion spaced from the first planar portion, and a recess extending inwardly from the first planar portion and the second planar portion; wherein the second tool comprises a protrusion; and wherein the method further comprises extending the protrusion of the second tool into the recess of the first tool to form the pressure resistance bead.
10. The method of claim 1, further comprising:
- providing a tool assembly including a first tool and a second tool disposed opposite the first tool; and
- forming the saw tooth panel formation by having the first tool cooperate with the second tool.
11. The method of claim 10 wherein the first tool comprises a forming member including a projection, a first planar portion disposed on one side of the projection, and a second planar portion disposed on the opposite side of the projection; wherein the second tool comprises a first member including an offset protrusion; and wherein the method further comprises moving the projection of the first tool toward the first member of the second tool as the offset protrusion of the first member of the second tool moves toward the second planar portion of the first tool, thereby making a plurality of bends in the panel to form the saw tooth panel formation.
12. The method of claim 11 wherein the first member includes a first side and a second side disposed opposite and distal from the first side; wherein the second tool further comprises a second member movably disposed on the first side of the first member, and a third member movably disposed on the second side of the first member; wherein the first tool further comprises a supporting member movably disposed beside the forming member; wherein the supporting member includes a shoulder; and wherein the method further comprises:
- forming a first bend of the saw tooth panel formation by having the second member cooperate with the first planar portion of the first tool;
- forming a second bend of the saw tooth panel formation with the projection of the first tool;
- forming a third bend of the saw tooth panel formation with the offset protrusion of the first member of the second tool; and
- having the third member cooperate with the supporting member to support the pressure resistance bead as the shoulder of the supporting member forms a fourth bend of the saw tooth panel formation.
13. The method of claim 1, further comprising the panel having a planar portion inboard of the saw tooth panel formation; wherein the planar portion has a depth; wherein the saw tooth panel formation comprises a plurality of bends and a drape defined by the distance between a first one of the bends and a second adjacent one of the bends; and wherein the ratio of the depth of the panel to the drape is from 1:1 to 1:4.
14. The method of claim 13, further comprising forming the drape symmetrically on opposing sides of a peak of the saw tooth panel formation.
15. The method of claim 1 wherein the pressure resistance bead has a depth; and wherein the depth is from 0.0060 inch to 0.0200 inch.
Type: Application
Filed: Mar 1, 2017
Publication Date: Jun 22, 2017
Applicant: STOLLE MACHINERY COMPANY, LLC (CENTENNIAL, CO)
Inventor: DENNIS C. STAMMEN (VANDALIA, OH)
Application Number: 15/446,161