EP3292051B1 - Lid for a beverage can - Google Patents

Description

The invention relates to a lid made of metal, in particular of aluminum, for a beverage can or the like, which is designed for permanent connection to a can body and which has a lid mirror, from which a rivet is formed and in which a breaking field defining predetermined breaking line is impressed, along which an opening in the lid mirror is to be opened by means of a grip tab which is fastened to the rivet and has a break-off edge which is pressed by raising a gripping portion of the grip tab when opening the opening to a predetermined pressing point of Aufbrechfeldes, wherein the lid mirror to the Rivet around a Nietfuß, in which the metal of the lid is thinner and / or more brittle than in the adjacent to the Nietfuß areas of the lid mirror.

Such lids are well known from conventional beverage cans ago. The beverage cans typically have a one-piece can body, which is formed from sheet metal and permanently connected to a cover made of sheet metal.

Typically, can body and lid are connected together by means of a double fold.

The lid itself is typically two-piece and has a top plate, also referred to as a shell, and a tab for opening a break-off panel in the top panel (the shell).

The cover plate typically has a central lid mirror (panel), which is surrounded by a circumferential countersink, which in turn is surrounded on its outside by a chuck wall. The Aufbrechfeld is located in the region of the lid and mirror defined by the predetermined breaking line, which is stamped as a narrow gap in the lid. Depending on the embodiment of the predetermined breaking lines, their cross-sectional profiles may be different. Mostly in the middle of the lid mirror and outside of the break-off field, a rivet is formed from the lid mirror to which the grip tab is typically pivotally attached.

The pull tab typically has a mounting portion with an opening into which protrudes the rivet formed from the lid mirror. On the one side of the mounting portion, a gripping portion is provided which is to grip with fingers and thereby lift. On the opposite side of the gripping portion of the mounting portion typically a Öffnerabschnitt is provided, the edge facing away from the rivet serves as Aufbrechkante and presses when lifting the gripping portion in the Öffnerstellung the gripping tab on the Aufbrechfeld in the lid mirror. Typically, the break-off edge presses near a rivet adjacent portion of the predetermined breaking line to a predetermined by the length of Öffnerabschnitts over the Aufbrechfeld crushing the Aufbrechfeldes, so that the predetermined breaking line breaks first in the immediate vicinity of the rivet and further tearing only with further lifting of the gripping portion until finally is torn on its full length and the Aufbrechfeld an opening in the lid mirror releases.

The initial tearing of the predetermined breaking line can be assisted by the fact that the predetermined breaking line in the vicinity of the rivet is typically surrounded by a region of the rivet Lid level runs, which is referred to as Nietfuß, and is formed by thinned and preferably brittle sheet material, which arises as a result of the formation of the rivet. This is for example off GB 2 432 825 A which discloses a lid according to the preamble of claim 1.

However, it may be desirable that the rivet near portion of the rupture line has a greater distance from the rivet than is usually the case. One reason for this may be that between the predetermined breaking line and rivet still a seal section should remain. In these cases, the distance of the predetermined breaking line of the rivet may be so large that the predetermined breaking line no longer passes through the Nietfuß, so no longer thinned as a result of the formation of the rivet and brittle sheet material. This complicates the initial breaking of the predetermined breaking line. In addition, the lever ratios are less favorable because the Aufbrechkante the Öffnerabschnitts the handle tab has a greater distance from the rivet than conventional lids for beverage cans. The invention has for its object to provide a lid for beverage cans that can be reliably opened even with increased distance of the predetermined breaking line from the rivet.

According to the invention this object is achieved by a cover of the type mentioned, in which the predetermined breaking line outside the Nietfußes and preferably at a distance from the Nietfuß and also provided outside the Nietfußes and preferably at a distance from the Nietfuß running, material-thinning embossing provided at least in a lid mirror area is, which is located between the Nietfuß and the predetermined pressing of the Aufbrechfeldes, wherein a longitudinal portion of the predetermined breaking line in the lid mirror area covered with the material thinning embossing along the longitudinal portion, wherein the embossing depth of the predetermined breaking line is greater than the embossing depth of the material thinning embossing.

With such a material-thinning embossing, which is designed in the form of a stamping depression, embrittlement of the sheet metal material of the cover, which is thinned by embossing, is also accompanied, so that an initial break-up of the predetermined breaking line is facilitated in the region in which the Fracture line covered with the material-thinning embossing and the largest bending stresses in the sheet material between the pressing of the Aufbrechfeldes where the sheet material is pressed when opening the drinking opening of the break-off edge of the grip tab, and the rivet.

An advantage of the invention is that the longitudinal section of the predetermined breaking line with the material-thinning embossing can cover exactly where an initial breaking of the predetermined breaking line is desired, that is very close to that pressing point of Aufbrechfeldes at which presses the break-off edge of the handle tab on the Aufbrechfeld to open the defined by the break line drinking opening. Since the material-thinning embossing preferably has no further task than to facilitate the breaking of the predetermined breaking line, the material-thinning embossing can be optimized precisely for this purpose in its design, for example in its width and depth.

Preferably, the predetermined breaking line at the ends of the longitudinal section, which overlaps with the material-thinning embossing, extends out of the overlap with the material-thinning embossing.

Preferably, the predetermined breaking line along the longitudinal section of the predetermined breaking line and along a length section of the material-thinning embossing, which is preferably designed as a shallow groove, is embossed into the material-thinning embossing and extends out of the material-thinning embossing at the ends of the longitudinal section. In this embodiment, in which the cross-sectional contour of the predetermined breaking groove extends through the bottom surface of the material-thinned embossing into the diluted metal material adjacent to the bottom surface, the embossing die for the predetermined breaking line penetrates through the bottom surface into the metal material which penetrates in its structure the impression of the material-thinning embossing was changed. As a result, microcracks can arise in this area, which can contribute to the easy breaking of the predetermined breaking line in this area.

Preferably, the material thinning embossing extends arcuately at least partially around the Nietfuß, which resulted from the formation of the rivet is. In this case, the material-thinning embossing is preferably annular and arranged concentrically around the rivet. This embodiment variant has the advantage that the stress distribution in the metal material becomes more uniform around the rivet foot.

Alternatively, the material-thinning embossing may also have the shape of a crescent-shaped portion, partly around the rivet, or the shape of a tangent to a circle surrounding the rivet.

The gripping portion of the gripping tab is preferably designed so that it can serve as a closure for the resulting opening of the Aufbrechfeldes opening. For this purpose, the gripping tab is preferably rotatable about the rivet such that the gripping portion of the gripping tab is to be moved beyond the respective opening resulting from the breaking of the predetermined breaking line. Such a grip tab is for example in EP 1 590 252 described.

The predetermined breaking line is preferably impressed along the longitudinal section into the material-thinning embossing and preferably runs out of the material-thinning embossing at the ends of the longitudinal section.

The material-thinning embossing preferably has a greater width than the predetermined breaking line in a direction extending radially to the rivet.

The material-thinning embossing has a width measured in the radial direction, which originates from the rivet, which is preferably greater than the width of the predetermined breaking line. This width of the material-thinning embossing is preferably between 0.6 millimeters and 1 millimeter and may be wider than the corresponding width of the predetermined breaking line. Depending on the geometry that is used for the cross-sectional contour of the predetermined breaking line used as embossing, but the width of the upper portion of the predetermined breaking line may be equal to or even slightly larger than the width of the material thinning embossing.

The material-thinning embossing can have an at least approximately uniform depth, at least over a certain minimum width, that is to say that the residual thickness of the sheet material in the region of the material-thinning embossing is at least approximately the same over this minimum width, so that a flat bottom of the material-thinning embossing results. Alternatively, the cross-sectional contour of the material-thinning embossing can also have a different shape, for example in a preferred embodiment configured as a flat, rounded recess, so that a flat rounded bottom surface of the material-thinning embossing results outside the overlap region with the predetermined breaking line.

The longitudinal section of the predetermined breaking line, which covers the material-thinning embossing along its length and preferably along a longitudinal section of the groove-shaped embossing, may, for example, have a straight course or an arcuate course, wherein the convex side of the arch can face the rivet. Preferably, this longitudinal section is arcuate and with its concave side facing the rivet. A large overlap length of the predetermined breaking line with the material-thinning embossing may be favorable, so that the breakage of the predetermined breaking line continues more easily in the predetermined breaking line after it has broken away from the breaking point when the break-off section is more strongly depressed by the breaking edge of the grip tab. The radius of curvature of the arcuate longitudinal section of the predetermined breaking line can be greater than the radius of curvature of an arcuate material-thinning embossing.

The center line of the material thinning embossing preferably has a distance (radius) between 4 millimeters and 4.5 millimeters from the central axis of the rivet, that is, in the case of a circle which the center line around the rivet describes, the circle diameter is 8 to 9 millimeters is.

The material-thinning embossing preferably extends arcuately at least partially around the rivet foot. Such a region of the cover mirror is formed by the rivet base around the rivet in which the sheet material of the cover mirror is thinner and preferably more brittle than in the regions of the cover mirror which adjoin the rivet foot around the rivet foot.

With a material thickness of the sheet material of 0.21 millimeters to 0.25 millimeters, for example 0.23 millimeters, the embossing depth of the material-thinning embossing is preferably 0.03 millimeters to 0.05 millimeters and is therefore within preferred range of the embossing depth of 15% to 25% of the material thickness, so that, for example, results in a residual wall thickness of 0.18 millimeters to 0.2 millimeters. Here, the embossing depth of the predetermined breaking groove is preferably 0.12 millimeters to 0.14 millimeters.

The material-thinning embossing is preferably introduced into the cover mirror from the outside (that is, from the outer side facing away from the later can interior), so that a small depression results on this outer side of the cover (the customer side of the cover). The predetermined breaking line is typically also impressed from the customer side (the outside of the lid) in the lid mirror.

Alternatively, the material-thinning embossing can also be impressed into the lid mirror by the inner side (the product side) facing the interior of the beverage can, while the predetermined breaking line is also impressed from the outside into the lid mirror in this case.

Preferably, the rivet is arranged outside the Aufbrechfeldes.

Preferably, the rivet is not centrally located on the lid mirror, but offset in the direction towards the edge of the lid mirror, in which the Aufbrechfeld is located.

In addition, the rivet is preferably arranged on a bead running around the Aufbrechfeld, which serves to stiffen the edge of the Aufbrechfeldes and the later drinking opening. This facilitates closure of the drinking opening of the gripping portion of the grip tab, wherein the edge of the drinking opening is stiffened by the circumferential bead accordingly. Accordingly, the rim facing the rivet of the longitudinal section of the predetermined breaking line covering itself with the material-thinning embossing is also stiffened against bending during the initial depression of the breaking field at the pressing point, so that the easy breaking of the predetermined breaking line is further promoted.

The predetermined breaking line and at least that section of the material-thinning embossing with which the longitudinal section of the predetermined breaking line overlaps preferably run at the level of the remaining cover mirror.

• Formen einer Blase
• erstes Knopfformen und
• zweites Knopfformen.

To achieve the object mentioned in the introduction, a method for producing a cover according to the aforementioned type, in which the shaping of the rivet from the cover mirror comprises the following steps, also contributes:

• Shapes of a bubble
• first button shapes and
• second button shapes.

In such a method, the material-thinning embossing is preferably introduced only during the second button forming from the (outer) side of the lid forth in the lid mirror into which later the predetermined breaking line is stamped and later on the gripping tab is attached. The rivet base around the rivet, which has arisen as a result of the rivet forming and in which the material of the cover plate is thinner and more brittle than in areas of the lid mirror adjacent the rivet base, preferably arises during the reaming and / or first button forming.

Alternatively, the material-thinning embossing can also be introduced simultaneously with the predetermined breaking line in the lid, in which case the predetermined breaking line is introduced from the (outer) side of the lid into its lid mirror on which the gripping tab is later attached (customer side), while the material-thinning Embossing of the other later side of the can contents (the inside or product side) is introduced forth into the lid.

The invention will now be explained in more detail by means of embodiments with reference to the figures of the drawing.

Figur 1a:

einen erfindungsgemäßen Deckel einschließlich Grifflasche in Draufsicht;

Figur 1b:

eine Querschnittskontur des Deckels gemäß der Schnittlinie A-A in Fig. 1 beim Öffnen der Trinköffnung;

Figur 2:

eine perspektivische Darstellung einer Deckelplatte (Shell) für den Deckel aus Figur 1;

Figur 3:

eine Aufsicht auf die Deckelplatte aus Figur 2;

Figur 4:

einen Schnitt A-A durch die Deckelplatte aus Figur 3;

Figur 5:

ein Detail B des Schnitts A-A aus Figur 4 mit einer vergrößerten Darstellung der materialverdünnenden Prägung und der diese überlagernden Sollbruchlinie;

Figuren 6a + 6b:

eine perspektivische Darstellung sowie eine Aufsicht auf einen Rohling der Deckelplatte mit einer bevorzugten Variante der materialverdünnenden Prägung, wie sie bei der Deckelplatte aus Figuren 2 bis 5 zum Einsatz kommt;

Figuren 7a + 7b:

eine perspektivische Ansicht und eine Aufsicht auf einen Rohling der Deckelplatte mit einer alternativen Variante einer materialverdünnenden Prägung;

Figuren 8a + 8b:

eine perspektivische Darstellung und eine Aufsicht auf einen Rohling der Deckelplatte mit einer weiteren alternativen Variante einer materialverdünnenden Prägung;

Figuren 9a + 9b:

eine perspektivische Darstellung und eine Aufsicht auf einen Rohling der Deckelplatte mit einer dritten Variante einer materialverdünnenden Prägung;

Figur 10a

eine Draufsicht auf eine Deckelplatte ähnlich zu Figur 3 in einer anderen Ausführungsform; und

Figur 10b

einen vergrößerten Abschnitt des Schnittes A-A aus Figur 10a mit einer Schnittdarstellung der Sollbruchlinie und der materialverdünnenden Prägung.

From the figures shows

FIG. 1a

a cover according to the invention including a grip tab in plan view;

FIG. 1b

a cross-sectional contour of the lid according to the section line AA in Fig. 1 when opening the drinking opening;

FIG. 2:

a perspective view of a cover plate (shell) for the lid FIG. 1 ;

FIG. 3:

a top view of the cover plate FIG. 2 ;

FIG. 4:

a section AA through the cover plate FIG. 3 ;

FIG. 5:

a detail B of the section AA FIG. 4 with an enlarged view of the material-thinning embossing and this overlying break line;

Figures 6a + 6b:

a perspective view and a plan view of a blank of the cover plate with a preferred variant of the material-thinning embossing, as in the cover plate FIGS. 2 to 5 is used;

Figures 7a + 7b:

a perspective view and a plan view of a blank of the cover plate with an alternative variant of a material-thinning embossing;

Figures 8a + 8b:

a perspective view and a plan view of a blank of the cover plate with a further alternative variant of a material-thinning embossing;

FIGS. 9a and 9b:

a perspective view and a plan view of a blank of the cover plate with a third variant of a material-thinning embossing;

FIG. 10a

a plan view of a cover plate similar to FIG. 3 in another embodiment; and

FIG. 10b

an enlarged portion of the section AA FIG. 10a with a sectional view of the predetermined breaking line and the material-thinning embossing.

FIG. 1a shows a lid made of sheet metal, in particular of aluminum, which has a curl 12 for later connection to a can body (not shown) having. In the region of the curl 12, the lid 10 is connected by means of a double fold with the can body.

The lid 10 is in two pieces and has a cover plate (shell) 14 and a tab (tab) 16. By means of the gripping tab 16, a Aufbrechfeld 18 can be broken in the cover plate 14 so that, for example, creates a drinking opening.

FIGS. 2 to 5 show the cover plate 14 of the lid 10 in detail.

Like conventional lids, the lid 10 has a central lid mirror (panel) 20 which is surrounded by a circumferential stiffening bead (counter sink) 22. The circumferential stiffening bead 22 in turn is surrounded by a chuck wall 24, which merges into the curl 12. The core slope 24 has an inwardly facing, circumferential projection 26 which serves for latching hold down a free end of a serving as a closure for the drinking opening gripping portion 28 of the grip tab 16 when it is rotated after breaking the Aufbrechfeldes 18 on the thus resulting drinking opening.

In the lid mirror 20 stiffening recesses 30 and 32 are formed, which stiffen the lid mirror 20 outside of an opening system formed in the lid mirror.

The opening system is formed by the Aufbrechfeld 18, which is defined by a predetermined breaking line 34 and is stiffened by a molded-annular projection 36. In addition, the Aufbrechfeld 18 is surrounded by a projecting beyond the level of the remaining lid level bead 38 which serves to stiffen the predetermined breaking line 34 bounding edge strips of sheet material and the periphery of the resulting after breaking the Aufbrechfeldes 18 drinking opening.

In the middle of the lid mirror 20, a rivet 40 is arranged on a plateau 42 formed by the protruding bead 38. The rivet 40 serves to fasten the grip tab 16 to the cover plate 14 and is arranged outside the breakaway field 18.

FIG. 1b shows a cross-sectional contour of the lid along the section line AA FIG. 1a with the pull tab 16 in a position to open the breakaway panel 18 by lifting the gripping portion 28 of the pull tab. The grip tab 16 is pivotally attached to the rivet 40 by means of a mounting portion so that the opener portion of the grip tab can be swung with its breakaway edge 50. As a result, the break-off edge is pressed onto a pressing point 48 of the break-off field 18, which is initially located at the rivet 40, so that the breaking line predominantly delimiting predetermined breaking line is broken and the now separated Aufbrechfeld is pivoted by further raising the gripping portion in the resulting drinking opening into it.

In FIG. 3 It is shown that the lid mirror around the rivet 40 around a so-called Nietfuß 47, of which around the rivet around a region is formed, which is formed by the rivet 40 has been formed out of the cover plate 14, so that the rivet 40th Outside the Nietfußes and at a distance from the Nietfuß a targeted introduced into the outer surface of the cover plate 14, material-thinning stamping 44 is provided which in the form of an annular groove or groove concentrically around the rivet 40, and whose width at the outer surface is slightly larger than the width of the predetermined breaking line 34 forming scribe.

The material-thinning embossing 44 is arranged and dimensioned such that the predetermined breaking line 34 in its rivet 40 next longitudinal portion 46, which also extends outside of the Nietfußes and at a distance from the Nietfuß, by the in FIG. 5 Dashed bottom surface 49 of the material thinning embossing 44 extends therethrough. In this way it is ensured that the predetermined breaking line 34 extends near the rivet 40 by thinned and brittle sheet material, which facilitates an initial breaking of the predetermined breaking line 34 in this section. The predetermined breaking line 34 has a distance in the range of 4 to 4.5 millimeters from the central axis of the rivet 40. Again FIG. 5 it can be seen, the material-thinning embossing has the cross-sectional contour of a flat rounded Trough with an embossing depth in the range of about 20% of the thickness of the sheet material. In the range of the width of the material-thinning embossing, the remaining sheet thickness of the sheet material of the lid 10 is about 0.18 millimeters to 0.2 millimeters. The cross-sectional contour of the predetermined breaking line 34, however, has an embossing depth of 0.12 to 0.14 millimeters.

The width of the material-thinning embossing (measured in the radial direction starting from the rivet) is preferably between 0.6 millimeter and 1 millimeter.

The FIGS. 6 to 9 show various alternative embodiments of a material-thinning embossing according to the invention.

In the FIGS. 6 to 9 blanks of the cover plate are shown after the formation of the rivet and the stamping of the material-thinning embossing, but before the formation of the other design features of the cover plate and before embossing the predetermined breaking line. Therefore, only the respective rivet 40 and the material-thinning embossing 44 are located in the region of the respective cover mirror 20. The remaining features of the opening system, however, are not shown.

The variant in Figures 6a and 6b corresponds to the embodiment according to the FIGS. 2 to 5 in which the rivet 40 is offset from the center of the lid mirror 20 out and in which the material thinning stamping 44 has the shape of a rivet 40 completely enclosing the rivet 40 concentric ring.

In the in the FIGS. 7a and 7b illustrated embodiment, the material-thinning embossing 44 'has the shape of a small circular area whose center has the same distance from the central axis of the rivet 40 as the center line of the annular material-deepening embossment 44 from the Figures 6a and 6b ,

In the embodiment according to FIGS. 8a and 8b the material thinning embossment 44 'has an elongated shape along a tangent to a circle (not shown) to the rivet 40 concentric circle.

According to the embodiment in FIGS. 9a and 9b For example, the material-thinning embossment 44 "is a circular arc portion around the rivet 40, that is, the concave side of the circular arc portion is turned toward the rivet.

Other forms of material-thinning embossing are conceivable, for example, one of the circular-arc, material-thinning embossing 44 '"similar embossment in crescent shape.

At the in FIG. 3 The longitudinal section 46 of the predetermined breaking line 34, along which the predetermined breaking line overlaps the material-thinning embossing 44, extends straight and in the direction of a tangent to the circular center line of the material-thinning embossing. In the embodiment of FIG. 10a on the other hand, the longitudinal section 46 of the predetermined breaking line 34, which overlaps with the circular material-thinning embossing 44, is formed in an arcuate manner with the rivet facing the concave side. The radius of curvature of the arc is slightly larger than the radius of the circular center line of the material-thinning embossing 44. At the two ends of the longitudinal section 46, the predetermined breaking line 34 extends laterally out of the material-thinning embossing. In comparison with the embodiment of FIG. 3 Therefore, results in a greater length of coverage of the predetermined breaking line 34 with the material-thinning embossing 44, whereby the breakage of the predetermined breaking line after breaking easier it can continue towards the ends of the longitudinal portion 46 and then into the remaining portions of the predetermined breaking line.

Out FIG. 10 on the right of the rivet 40, the trough-shaped cross-sectional contour of the material-thinning embossing 44 can be seen, whereas to the left of the rivet, the overlay contour 34 + 44 of predetermined breaking groove and material-thinning embossing is shown. Due to the greater width and embossing depth of the cross-sectional contour of the predetermined breaking line, the material-thinning embossment in the overlapping region was widened and deepened by the embossing stamp for the predetermined breaking line.

In the embodiment of FIG. 10a For example, the bead and rivet 40 are slightly offset from the center of the lid mirror toward the breakout field 18.

LIST OF REFERENCE NUMBERS

10

cover

2

curl

14

Cover plate (shell)

16

Grip tab (tab)

18

Aufbrechfeld

20

Cover mirror (panel)

22

Stiffening bead (counter sink)

24

Core chuck (chuck wall)

26

All-round lead

28

cross section

30

Stiffening depression

32

Stiffening depression

34

Line of weakness

36

head Start

38

bead

40

rivet

42

plateau

44

Material thinning imprint

46

Longitudinal section of the predetermined breaking line

47

rivet foot

48

depressing point

49

Bottom surface of the material-thinning embossing

50

Aufbrechkante

Claims (15)

1. A lid (10) made of metal, in particular aluminum, for a beverage can or the like, designed for permanent connection to a can body and having a lid panel (20), from which a rivet (40) is shaped and into which a predetermined breaking line (34), which defines a breaking-open area (18), is impressed, along which an opening in the lid panel (20) is to be opened by means of a grip tab (14), which is attached to the rivet and has a break-open edge (50) pressed against a predetermined pressing point (48) of the breaking-open area (18) by raising a grip section (28) of the grip tab when opening up the opening, wherein the lid panel (20) has a rivet base (47) around the rivet (40), in which the metal of the lid (10) is thinner and/or more brittle than in the regions of the lid panel (20) adjacent to the rivet base,
   characterized in that the predetermined breaking line (34) runs outside of the rivet base and in that a material-thinning embossment (44), which also runs outside of the rivet base and is designed in the form of an embossing recess and is associated with an embrittlement of the thinned-out material, is provided at least in a lid panel area situated between the rivet base (47) and the predetermined pressing point (48) of the breaking-open area (18), wherein a longitudinal section (46) of the predetermined breaking line (34) in this lid panel area overlaps with the material-thinning embossment (44) along the longitudinal section, wherein the embossing depth of the predetermined breaking line (34) is greater than the embossing depth of the material-thinning embossment (44).
2. The lid (10) according to claim 1, characterized in that the grip tab (14) can be rotated around the rivet (40) in such a way that the grip section (28) of the grip tab (14) can be moved over the opening formed by breaking open the predetermined breaking line (34), wherein the grip section (28) is designed for closing the opening.
3. The lid (10) according to claim 1 or 2, characterized in that the predetermined breaking line (34) is impressed in the material-thinning embossment (44) along the longitudinal section (46) and exits from the material-thinning embossment at the ends of the longitudinal section.
4. The lid (10) according to at least one of claims 1 to 3, characterized in that the material-thinning embossment has a greater width, measured in the direction radially to the rivet, than the predetermined breaking line (34).
5. The lid (10) according to at least one of claims 1 to 4, characterized in that the material-thinning embossment has a width of 0.6 millimeter to 1 millimeter, measured radially to the rivet.
6. The lid (10) according to at least one of claims 1 to 5, characterized in that a center line of the material-thinning embossment (44) is a distance of 4 millimeters to 4.5 millimeters from an axis of the rivet (40).
7. The lid (10) according to at least one of claims 1 to 6, characterized in that the embossing depth of the material-thinning embossment (44) is 0.03 millimeter to 0.05 millimeter.
8. The lid (10) according to at least one of claims 1 to 7, characterized in that, optionally, the material-thinning embossment (44) runs in a curved shape at least partially around the rivet base (47) or
   the material-thinning embossment (44) runs partially around the rivet in a crescent shape, or the material-thinning embossment (44) runs outside of the rivet base tangentially to a circle around the rivet base.
9. The lid (10) according to claim 8, characterized in that the material-thinning embossment (44), which runs in a curved shape at least partially around the rivet base (47), optionally runs in a ring shape concentrically around the rivet or runs partially around the rivet in a crescent shape.
10. The lid (10) according to at least one of claims 1 to 9, characterized in that the longitudinal section (46) of the predetermined breaking line (34) with which the material-thinning embossment (44) overlaps runs in a curved shape with the concave side facing the rivet.
11. The lid (10) according to at least one of claims 1 to 10, characterized in that the rivet (40) is arranged on a bead (38), which is elevated with respect to a level of the lid panel (20) and runs around the breaking-open area, while the predetermined breaking line (34) and the material-thinning embossment (44) run at the level of the lid panel (20).
12. The lid (10) according to at least one of claims 1 to 11, characterized in that the material-thinning embossment (44) forms a recess on an exterior side (customer side) of the lid (10) facing away from the interior of the can.
13. The lid (10) according to at least one of claims 1 to 12, characterized in that the rivet (40) is arranged eccentrically on the lid panel (20).
14. A method for producing a lid (10) according to at least one of claims 1 through 13, characterized in that the shaping of the rivet (40) out of the lid panel (20) comprises the following steps:

    - shaping a bubble,

    - a first knob-shaping, and

    - a second knob-shaping,

    wherein the material-thinning embossment (44) is introduced during the second knob-shaping from an exterior side of the lid (10) into the lid panel (20) thereof, at which exterior side the grip tab (14) is subsequently attached (customer side), and then the predetermined breaking line (34) is impressed.
15. The method for manufacturing a lid (10) according to at least one of claims 1 to 13, characterized in that the material-thinning embossment (44) is introduced in the lid (10) simultaneously with the predetermined breaking line (34), wherein the predetermined breaking line (34) is introduced from an exterior side of the lid (10) into the lid panel (20) thereof to which exterior side the grip tab (14) is attached subsequently (customer side) while the material-thinning embossment (44) is introduced into the lid (10) from the other side (product side) that faces the interior of the can after connecting with the can body.

Images