WO2020229766A1

WO2020229766A1 - Lightweight beverage can made of aluminum alloy

Info

Publication number: WO2020229766A1
Application number: PCT/FR2020/050777
Authority: WO
Inventors: Alireza Arbab; Thierry BAYLE; Laurent LASZCZYK; Camille LINARDON
Original assignee: Constellium Neuf-Brisach; Constellium Muscle Shoals Llc
Priority date: 2019-05-13
Filing date: 2020-05-12
Publication date: 2020-11-19
Also published as: FR3096035A1; FR3096034B1; FR3096034A1; FR3096035B1

Abstract

The invention relates to a beverage can on the basis of an aluminum alloy, preferably for a carbonated drink, comprising: a body 5 having a cylindrical shape and an outer diameter D1; - a concave dome-shaped bottom 1 having a depth H1 at its center, an outer diameter D3 and a rectilinear part 2 having a height H3; - a convex lower ring 6 having a bearing diameter D2 and a width L1; - a comb 4 connecting the body 5 and the dome 1. The invention is characterized in that the thickness of the sheet of the dome is from 180 to 230 μm, preferably from 190 to 220 μm; and in that the diameter D2 of the lower ring is from 39 to 47 mm, preferably from 40 to 46 mm; and in that the lower ring comprises concave deformations 9 which are distributed at regular intervals along the ring; and in that the comb 4 comprises, or preferably consists of, a rectilinear portion 7 and a curved portion 8, the curved portion 8 comprising, or preferably consisting of, a succession of three radii, a first radius R1, a second radius R2 and a third radius R3, forming undulations from the body 5 to the rectilinear portion 7.

Description

DESCRIPTION

Title: Lightened beverage tin in aluminum alloy TECHNICAL FIELD

The technical field of the invention is that of beverage cans, in particular carbonated drinks, based on aluminum or an aluminum alloy. Figure 1 shows a sectional diagram of a beverage can half bottom. Referring to Figure 1, a beverage can generally comprises a beverage can body 5, a dome 1, a lower ring 3, a rectilinear part 2 of the dome 1 and a comb 4 connecting the lower ring and the body of the drink box. PRIOR ART

There is prior art provided in the field of beverage cans to solve various technical problems. For example, US Pat. No. 4,685,582 of National Can Corporation is known, which describes a solution for improving the compatibility between the bottom and the cover of beverage cans with the aim of being able to stack the beverage cans easily during their transport and their storage.

US patent 5,680,952 to Bail Corporation is also known, which describes a beverage can having particular dimensions, as well as deformations on the dome of the bottom of the beverage can.

There are also several documents describing convex or concave deformations on the dome of the bottom of the beverage can and / or the oblique lower edge of the bottom of the beverage can. Mention may in particular be made of US patent 4,953,738 to Stirbis, US patent application 2008/0029523 to Rexam Beverage Can, or else US patent 7,185,525 to Elmer.

Also known is US Pat. No. 4,732,292 to Schmalbach-Lubeca GmbH, which describes concave deformations on the bottom of the beverage can, distributed over at least two concentric circles of different diameters.

Patent application EP 0 302 412 of Pac International Inc. is also known, which describes a particular structure for the bottom of a beverage can with a series of shelves and flat parts.

Despite all these solutions, manufacturers are constantly in search of cost reduction, by focusing in particular on reducing the thickness of the metal alloy used for the manufacture of beverage cans. This reduction in thickness raises many problems, which can be for example the shaping and the mechanical resistance of the beverage can (axial resistance for stacking beverage cans, resistance to internal pressure which may vary during filling of the beverage can and during transport and storage, resistance to the beverage can falling after filling, etc.).

The resistance to internal pressure, which is one of the main properties sought, can be characterized by a test consisting in increasing the internal pressure (= pressure inside the beverage can). This test makes it possible to identify two values known to those skilled in the art: the overturning pressure, which corresponds to the maximum pressure observed when the dome is overturned, and the increase in the height of the beverage can after a pressure cycle. typical (increase from 0 to 6.2 bar, then decrease to 3.5 bar). This increase in the height of the beverage can corresponds to the residual deformation caused by the increase in pressure and which persists even after the decrease in internal pressure. As illustrated in the examples below (see Figures 11 to 13), the inventors propose two curves representing the increase in the height of the beverage can (measured at the level of the lower ring) as a function of the internal pressure in order to to determine these two values and to understand the associated physical phenomena.

A theoretical example of such a curve is given in Figure 2 of the present description. This curve can be described by three stages I, II and III corresponding to distinct deformation mechanisms of the beverage can a, b and c, as illustrated in FIG. 3 of the present description. A first linear stage, called stage I on the curve of Figure 2, corresponds to an elastic deformation characterized by a slight swelling of the dome and a rotation of the oblique edge (respectively a and b of Figure 3). At this point, if the internal pressure is removed, the dome and oblique edge can return to the original position. This stage I is not very sensitive to the reduction in thickness of the bottom of the beverage can.

A second linear stage, called stage II on the curve in Figure 2, corresponds to the start of plastic deformation of the dome (a in Figure 3) characterized by the irreversible unfolding of the radius of the lower ring (c in Figure 3) ), as well as an amplified swelling of the dome. At this point, if the pressure is removed, the dome no longer returns to its initial position and there is residual deformation of the lower ring. This stage II is sensitive to the reduction in thickness of the bottom of the beverage can: the resulting deformation of the pressure increases when the thickness decreases, which limits the possibilities of reducing the thickness.

Finally a third stage, called stage III on the curve of Figure 2, corresponds to a dramatic and irreversible deformation of the dome, that is to say that at this stage a minimal amount of additional pressure compared to stage II leads to a very important deformation of the dome, the oblique edge and the lower ring (respectively a, b and c in Figure 3) which persists even after pressure reduction. The thickness of the dome is chosen such that the overturning pressure is greater than the maximum internal pressure observed during the production, transport or storage of beverage cans, namely generally 90 psi or about 6.2 bar.

DISCLOSURE OF THE INVENTION

In this context of reducing the thickness of the aluminum alloy sheet used for the manufacture of beverage cans put into perspective with the resistance to internal pressure, the inventors have developed a beverage can capable of maintaining, even of improve the resistance to internal pressure, despite the reduction in thickness of the aluminum alloy sheet. Currently, aluminum alloy sheet thicknesses for beverage cans are generally about 260 µm in the United States and about 245 µm in Europe. The aluminum alloy sheet thicknesses targeted according to the present invention are of the order of 200 to 230 μm, or approximately 6 to 18% reduction in thickness in Europe and approximately 11 to 23% in the United States. The technical problem solved according to the present invention is therefore to reduce the thickness of the aluminum alloy sheet used for the manufacture of beverage cans, for example by 5 to 25% compared to what is usually practiced in the field. beverage cans (about 15 to 60 µm reduction), while improving the resistance to internal pressure compared to a conventional beverage can obtained from a thinned sheet and while maintaining the resistance to internal pressure compared to a classic commercial drink can.

It should be noted that the reduction in thickness of the aluminum alloy sheet used for the manufacture of beverage cans ultimately makes it possible to lighten the beverage cans by 2 to 15%, knowing that the bottom of the beverage can, which retains the initial thickness of the aluminum alloy sheet, generally represents more than 30% of the total weight of the beverage can.

In addition to the resistance to internal pressure, a person skilled in the art is also faced with problems of stability and stackability of beverage cans during their transport and storage. It should be noted that the present invention, which makes it possible to limit the deformations undergone by the cans during their life cycle because of the internal pressure, has the advantage of limiting the impact of these deformations on the stability and stackability. drink cans.

A first object of the invention is a beverage can based on an aluminum alloy, preferably for carbonated drinks, comprising:

a body 5 of cylindrical shape having an external diameter DI; a bottom in the form of a concave dome 1 having a depth H1 at its center, an external diameter D3 and a rectilinear part 2 of height H3;

- a convex lower ring 6 having a bearing diameter D2 and a width L1;

- a comb 4 connecting the body 5 and the dome 1;

characterized in that the thickness of the dome sheet is 180 to 230 µm, preferably 190 to 220 µm;

and in that the diameter D2 of the lower ring is 39 to 47 mm, preferably 40 to 46 mm;

and in that the lower ring comprises concave deformations 9, distributed at regular intervals along the ring;

and in that the comb 4 comprises, preferably consists of, a rectilinear section 7 and a curved section 8, the curved section 8 comprising, preferably consisting of, a succession of three spokes, a first spoke RI, a second radius R2 and a third radius R3, forming undulations from the body 5 to the rectilinear section 7.

A second object of the invention is a method of manufacturing a beverage can according to the present invention, comprising the following successive steps:

- Supply of an aluminum alloy, for example AA3104, for example in the metallurgical state H14 or H19, in the form of a strip with a thickness of 180 to 230 μm, preferably 190 to 220 μm;

- cutting of discs called blanks in the aluminum alloy strip;

- Stamping and stretching of the blanks to obtain a beverage can body, using tools suitable for forming the beverage can as described in the present application;

- Manufacture of a cover with another aluminum alloy, for example AA5182;

- assembly of the lid and the body of the drink can to obtain a drink can.

A third object of the invention is a tool for shaping the beverage can according to the present invention.

FIGURES

[Fig. 1] Figure 1 is a sectional diagram of a beverage can half bottom. Reference 1 corresponds to the dome of the beverage can, reference 2 to the rectilinear part of the dome, reference 3 to the lower ring, reference 4 to the oblique edge of the bottom of the beverage can, called comb, and reference 5 to the body of the drink can.

[Fig. 2] Figure 2 is a theoretical curve illustrating the increase in the height of the beverage can, measured at the level of the lower ring, as a function of the internal pressure, that is to say say the pressure inside the drink can. Reference I corresponds to a stage of reversible deformation, reference II to a stage of non-reversible deformation, which could adversely affect the stability or stackability of the beverage can, and reference III to a stage where the dome collapses. return. In stage III, the beverage can is then no longer stable, that is to say that it can no longer stand upright, and it is no longer stackable.

[Fig. 3] Figure 3 is a sectional diagram of a beverage can half-bottom illustrating the different stages of deformation as a function of the increase in internal pressure. The solid line (stage 0) corresponds to the undeformed beverage can. The dashed line corresponds to the limits of the bottom of the beverage can when transitioning from stage I to stage II in Figure 2. The dotted line corresponds to the limits of the bottom of the beverage can when transitioning from stage II to stage III in Figure 2. The reference "a" corresponds to the deformation of the dome, the reference "b" to the deformation of the oblique edge, and the reference "c" to the deformation of the lower ring.

[Fig. 4] Figure 4 is a sectional diagram of a beverage can half-bottom according to the present invention, and in particular according to Example 2 below. In this figure, the references 1, 2 and 5 are the same as those described in connection with Figure 1 above. Reference 6 corresponds to the lower ring according to the present invention, reference 7 to the rectilinear section of the comb, reference 8 to the curved section of the comb comprising a succession of three spokes forming undulations, and reference 9 to a deformation. concave of the lower ring (for example a rib).

[Fig. 5] Figure 5 is a sectional diagram of a beverage can half-bottom according to the present invention, and in particular according to Example 2 below. In this figure, the reference DI corresponds to the external diameter of the beverage can, D2 to the bearing diameter of the lower ring, D3 to the external diameter of the dome (= diameter of the rectilinear part of the dome), D4 to the diameter of the beginning of the rectilinear section of the comb, H1 at the depth of the dome, H2 at the height of the comb, H3 at the height of the rectilinear part of the dome, H4 at the height of the start of the rectilinear section of the comb, L1 at the width of the lower ring (usually measured halfway up) and A2 at the corner of the straight section of the comb.

[Fig. 6] Figure 6 is a sectional diagram of a beverage can half bottom according to the present invention, and in particular according to Example 2 below. In this figure, the reference A3 corresponds to the angle of the flat of a concave deformation, A4 to the angle of the flat of the lower ring, L2 to the length of the rectilinear section of the comb, L3 to the length of the flat of a concave deformation, L4 at the length of the flat of the lower ring, RI at the first radius of the curved section of the comb, R2 at the second radius of the curved section of the comb and R3 at the third radius of the curved section of the comb.

[Fig. 7] Figure 7 is a diagram of a concave deformation in section perpendicular to the radius of the lower ring. In this figure, reference 10 corresponds to the base of the lower ring, reference 11 to the flat of the concave deformation and reference 12 to the curved section of the concave deformation.

[Fig.8] Figure 8 is a diagram of a concave deformation in section perpendicular to the radius of the lower ring. In this figure, the reference H5 corresponds to the depth of the concave deformation and L5 to the length of the concave deformation.

[Fig. 9] Figure 9 is a sectional diagram of a beverage can half-bottom according to the present invention, and in particular according to Example 1 below. In this example, the length of the flat of the lower ring L4 is equal to 0. In this figure, the references 1, 2 and 5 are the same as those described in connection with Figure 1 above, and the references 6 to 9 are the same as those described in connection with Figure 4 above.

[Fig. 10] Figure 10 is a three-dimensional diagram of a cross section of a beverage can bottom according to the present invention, and in particular according to Example 1 below. In this figure, the references 1, 2 and 5 are the same as those described in connection with Figure 1 above, and the references 6 to 9 are the same as those described in connection with Figure 4 above.

[Fig. 11] Figure 11 is a curve showing the increase in the height of the beverage can in mm, measured at the center of the dome, as a function of the internal pressure in bars, that is to say the pressure inside. of the drink can. It illustrates the simulations for measuring the overturning pressure for several beverage cans as explained in the examples below.

[Fig. 12] Figure 12 is a curve showing the increase in the height of the beverage can in mm, measured at the center of the dome, as a function of the internal pressure in bars, that is to say the pressure inside. of the drink can. It illustrates the simulations for measuring the overturning pressure for several beverage cans as explained in the examples below.

[Fig. 13] Figure 13 is a curve showing the increase in the height of the beverage can in mm, measured at the center of the dome, as a function of the internal pressure in bars, that is to say the pressure inside. of the drink can. It illustrates the dome deformation measurement simulations for several beverage cans as explained in the examples below, during the beverage cans filling process, with first an increase in internal pressure to 6.2 bars, then a drop to 3.5 bars (operating pressure).

DETAILED DESCRIPTION OF THE INVENTION

In the description, unless otherwise indicated:

- the designation of aluminum alloys conforms to the nomenclature established by The Aluminum Association;

- the contents of chemical elements are indicated in% and represent mass fractions, unless otherwise indicated.

According to the present invention, the term “convex” means oriented towards the outside of the beverage can.

According to the present invention, the term “concave” means oriented towards the inside of the beverage can.

The beverage can according to the present invention makes it possible to compensate for the loss of resistance to internal pressure due to a reduction in the thickness of the aluminum alloy sheet from which the beverage can is made.

In general, with current processes, it is considered that the maximum internal pressure that a beverage can undergoes during its life cycle is about 6.2 bars (or 90 psi). Also, it is desirable for the overturning pressure to be greater than 6.2 bars. The inversion pressure is the pressure at which the dome of the bottom of the beverage can is inverted. This reversal is irreversible and prevents the stability and stacking of the beverage cans on top of each other.

With regard to the stability and stackability of beverage cans during their transport and storage, it is generally accepted in the field of beverage cans for beverages, and in particular for carbonated drinks, that the height of the beverage can should not exceed the height of the beverage can by more than 2.5 mm without deformation.

During the beverage can filling process, the internal pressure is cycled by first rising to about 6.2 bar, then dropping down to a pressure of about 3.5 bar. This cycle is described in Figure 13. The filling process requires that the deformation of the height of the beverage can caused by this cycle is as low as possible. For example, we can calculate that this deformation with the reference beverage can is 2.3 mm. And it is estimated that values above, for example 2.8 mm, can create production problems during the filling process. In addition to resistance to internal pressure, a beverage can is also preferably resistant to axial loading when stacking unfilled beverage cans (palletizing) and resistant to deformation when the filled beverage cans fall.

The beverage can according to the present invention makes it possible to compensate for the loss of strength due to the reduction in thickness of the aluminum alloy sheet from which the beverage can is made. In general, the beverage can according to the present invention makes it possible to limit the deformation of the bottom of the beverage can, and in particular of the dome, the lower ring and the comb, in stage II and to push back stage III (dramatic deformation ) at higher pressure levels than those requested by customers, generally 6.2 bars.

The solution proposed according to the present invention comprises the combination of three characteristics having a synergistic effect:

- reduction of the radius of the dome and the lower ring;

- addition of concave deformations (for example notches or ribs) at the level of the lower ring;

- addition of a curved section comprising a succession of three spokes in the comb of the beverage can.

A first object according to the present invention is a beverage can based on an aluminum alloy, preferably for a carbonated drink, comprising:

a body 5 of cylindrical shape having an external diameter DI;

- A bottom in the form of a concave dome 1 having a depth H1 at its center, an external diameter D3 and a rectilinear part 2 of height H3;

- a convex lower ring 6 having a bearing diameter D2 and a width L1;

- a comb 4 connecting the body 5 and the dome 1;

and in that the comb 4 comprises, preferably consists of, a rectilinear section 7 and a curved section 8, the curved section 8 comprising, preferably consisting of, a succession of three spokes, a first spoke RI, a second radius R2 and a third radius R3, forming undulations from the body 5 to the rectilinear section 7 of the comb 4. The curved section 8 of the comb 4 is located between the body 5 of the beverage can and the straight section 7 of the comb 4. The straight section 7 of the comb 4 is located between the curved section 8 of the comb 4 and the lower ring 6.

The first radius RI is a convex radius located between the body 5 of the beverage can and the radius R2. The second ray R2 is a concave ray located between the rays RI and R3. The third third ray R3 is a convex ray located between the ray R2 and the rectilinear section 7 of the comb 4.

Preferably, the outer diameter ID of the body 5 of the beverage can according to the present invention is 51 to 67 mm, preferably 55 to 63 mm.

Preferably, the dome 1 of the beverage can according to the present invention has at least one of the following characteristics:

- an external diameter D3 of 36 to 44, preferably 37 to 43 mm; and or

- a depth H1 of 9 to 13 mm, preferably 8 to 12 mm; and or

- A rectilinear part of height H3 from 2 to 7 mm, preferably from 3 to 6 mm.

Preferably, the lower ring 6 of the beverage can according to the present invention has at least one of the following characteristics:

- a width L1 of 2 to 5 mm, preferably 2.5 to 4.5 mm; and or

- a flat forming an angle A4 with the horizontal towards the inside of the beverage can from 0 to 10 °; and or

- a flat having a length L4 of 0 to 2 mm.

As regards the lower ring, its geometry (for example its shape and its diameter) can be optimized to gain performance according to the applications envisaged. Likewise, the dimensions (eg height, width, radii of curvature) of the lower ring can also be optimized.

Preferably, the comb 4 of the beverage can according to the present invention has at least one of the following characteristics:

- a height H2 of 5 to 10 mm; and or

- A rectilinear section 7 forming an angle A2 with the horizontal of 15 to 40 °; and or

a diameter D4 at the start of the rectilinear section 7 of 46 to 51 mm; and or

- a height H4 of the start of the rectilinear section 7 of 1.5 to 3.5 mm; and or

a length L2 of the rectilinear section 7 of 0.5 to 4 mm; and or

- A first radius RI of the curved section 8 from 2 to 3 mm; and or - a second radius R2 of the curved section 8 from 1 to 3 mm; and or

- a third radius R3 of the curved section 8 from 1 to 3 mm.

As regards the curved section of the comb, the successive radii can be optimized to gain performance according to the applications envisaged.

Preferably, the concave deformations 9 of the beverage can according to the present invention have at least one of the following characteristics:

- a depth H5 of 0.1 to 3.5 mm, preferably 0.1 to 2 mm; and or

- a length L5 of 1 to 10 mm; and or

- a number N from 4 to 18, preferably from 5 to 12; and or

- A flat forming an angle A3 with the horizontal towards the inside of the beverage can from 0 to 10 °; and or

- a flat having a length L3 of 0 to 2 mm.

As regards the concave deformations, their shape and their number can be optimized according to the applications envisaged in order to gain in performance. In particular, the concave deformations extend generally and preferably over the entire width of the lower ring. A second object of the invention is a method of manufacturing a beverage can according to the present invention, comprising the following successive steps:

- cutting of discs called blanks in the aluminum alloy strip;

- Manufacture of a cover with another aluminum alloy, for example AA5182;

- assembly of the lid and the body of the drink can to obtain a drink can.

As regards the manufacture of the beverage can according to the present invention, those skilled in the art will know how to adapt the tools and parameters for shaping the bottom of the beverage can according to the present invention.

The metal used for the manufacture of beverage cans can be any aluminum alloy known to those skilled in the art which is suitable for this application. For example, an AA3104 type alloy can be used. The metallurgical state of the aluminum alloy can be adapted according to the particular application. For example, the metallurgical state can be H14, H16 or H19, as described in standard EN515 (June 1993).

EXAMPLES

For the purpose of illustrating the present invention, several beverage can preforms have been evaluated from the point of view of their overturning pressure and their increase in can height as a function of internal pressure. The preforms correspond to the beverage can just after the bottom has been shaped, without taking into account the subsequent steps of stiffening (reforming in English) of the dome. The metal of the beverage cans was AA3104 aluminum alloy in H19 metallurgical condition.

To determine the overturning pressure, follow the height of the beverage can, measured between the base of the lower ring and the top of the beverage can as a function of the pressure. These measurements make it possible to draw a curve such as those presented in Figures 11 and 12. In these figures, the reference C1 corresponds to a reference beverage can having a conventional geometry as illustrated in Figure 1 and a dome sheet thickness. from 240 pm. The reference C2 corresponds to a reference beverage can having a conventional geometry as illustrated in Figure 1 but with a dome sheet thickness of 200 µm. The bearing diameter of C1 and C2 is 57 mm. The reference C3 corresponds to the drink can C2 but with a support diameter of 42 mm. The reference C4 corresponds to the drink can C3 but with 12 concave deformations (ribs) in the lower ring, having a depth H5 of 0.87 mm, a flat length L3 of 1.05 mm and a length L5 of 1, 6 mm. The reference C5 corresponds to the drink can C3 but with a curved section in the comb, the comb having a first radius RI of 3.28 mm, a second radius R2 of 1.05 mm, a third radius R3 of 1.01 mm , a rectilinear section angle A2 of 20 °, a height H2 of 7.5 mm, a height of the start of straight section H4 of 2.48 mm, a diameter of the start of straight section D4 of 47.16 mm and a length of straight section L2 of 1.78 mm. The references C1 to C5 are not according to the present invention. The drink cans C6 and C7 are drink cans according to the present invention (Example 1 and Example 2 respectively) and correspond to the drink can C3 but with 12 concave deformations (ribs) in the lower ring and a curved section in the comb. Table 1 below gives the different characteristics of the C6 and C7 beverage cans. [Table 1]

The evaluation of the overturning pressure and of the increase in the height of the box as a function of the internal pressure was carried out thanks to numerical finite element modeling with the commercial software "LS Dyna", version 10.1, developed by the Livermore Software Technology Corporation. The modeling consisted in first drawing the shape of the various domes in Computer Aided Design (CAD plans). The CAD drawings were imported under "LS Dyna" via data entry software called "LS prepost" developed by the same company. The boundary conditions were applied to simulate the preform as a whole. The calculation was controlled with a constant internal flow increment, allowing to simulate:

- the resulting internal pressure, and

the displacement of the various points of the dome under this internal pressure.

By combining these two variables, it was possible to plot the curve giving the increase in the height of the beverage can as a function of the internal pressure. Figures 11 and 12 correspond to a constant increase in internal pressure, until the dome overturns. FIG. 13 corresponds to a first cycle of increasing the internal pressure to 6.2 bars and then to a second cycle of decreasing the internal pressure to 3.5 bars. The (residual) increase in height of the beverage can is measured at this pressure stage. The results obtained in terms of overturning pressure and increase in beverage can height are given in Figures 11 to 13 and in Table 2 below.

[Table 2]

According to the curves of Figures 11 to 13 and Table 2 above, the beverage cans according to the present invention make it possible to counterbalance the negative effects of a reduction thickness of the sheet (drink can C2) on the overturning pressure and the increase in height of the drink can, and to find values equivalent to those obtained with the reference drink can C1.

Note that Figures 11 and 13 illustrate the synergistic effect of the combination between the decrease in the diameter of the lower ring, the presence of concave deformations in the lower ring and the presence of a curved section. particular in the comb. In fact, the values for increasing the height of the beverage can are only satisfactory by combining the three characteristics together. The combination of only two elements between them is not enough (see curves C3 to C5).

Claims

1. Beverage tin made of aluminum alloy, preferably for carbonated beverage, comprising:

a body 5 of cylindrical shape having an external diameter DI;

a bottom in the form of a concave dome 1 having a depth H1 at its center, an external diameter D3 and a rectilinear part 2 of height H3;

- a convex lower ring 6 having a bearing diameter D2 and a width L1;

- a comb 4 connecting the body 5 and the dome 1;

2. Beverage can according to claim 1, characterized in that the outer diameter ID of the body 5 is 51 to 67 mm, preferably 55 to 63 mm.

3. Beverage can according to any one of the preceding claims, characterized in that the dome 1 has an outer diameter D3 of 36 to 44 mm, preferably 37 to 43 mm.

4. Beverage can according to any one of the preceding claims, characterized in that the lower ring 6 has a width L1 of 2 to 5 mm, preferably 2.5 to 4.5 mm. 5. Beverage can according to any one of the preceding claims, characterized in that the comb 4 has:

- a length L2 of the rectilinear section 7 of 0,

5 to 4 mm;

- A first radius RI of the curved section 8 from 2 to 3 mm; - a second radius R2 of the curved section 8 from 1 to 3 mm; and

- a third radius R3 of the curved section 8 from 1 to 3 mm.

6. Drink can according to any one of the preceding claims, characterized in that the concave deformations 9 have:

- a depth H5 of 0.1 to 3.5 mm, preferably 0.1 to 2 mm;

- a length L5 of 1 to 10 mm; and

- a number N from 4 to 18, preferably from 5 to 12.

7. Drink can according to any one of the preceding claims, characterized in that the concave deformations 9 have a flat, said flat forming an angle A3 with the horizontal towards the inside of the drink can from 0 to 10 ° and having a length L3 from 0 to 2 mm.

8. A method of manufacturing a beverage can according to any one of the preceding claims, comprising the following successive steps:

- cutting of discs called blanks in the aluminum alloy strip;

- Stamping and stretching of the blanks to obtain a beverage can body, using tools suitable for forming the beverage can as described in any one of the preceding claims;

- Manufacture of a cover with another aluminum alloy, for example AA5182;

- assembly of the lid and the body of the drink can to obtain a drink can.

9. Tool for shaping the beverage can according to any one of claims 1 to 7.