Method and apparatus for manufacturing a pullable closure - Patents.com

Abstract

A method of manufacturing a ring-pull closure pull-off closure for closing a container is disclosed in which a sheet of metal material is cut and drawn to obtain a plurality of shells, each having a central closure wall and a peripheral skirt wall, and each shell is scored, after drawing, to obtain at least one circumferentially extending score line that forms a line of preferential breakage by tearing due to pulling on a gripping element applied to the shell.

Description

[Technical field]

[0001] The present invention relates to a method and / or an apparatus for manufacturing a pull-out closure, which can be used in particular for closing the mouth of a container, such as a bottle.

[0002] The present invention specifically, but not exclusively, relates to retractable closures, also known as ring-pull closures, i.e. pull-off closures, which are typically made of a metallic material (e.g., aluminum) and include an element (e.g., a ring) that a user can pull to remove the closure and open a container. [Background technology]

[0003] U.S. Patent Application Publication No. 2019 / 0263570, JP 2008-174266 A, JP 11-115937 A, JP 4065690 A, EP 3037361 A, and U.S. Pat. No. 1005046 show embodiments of pull-off closures that can be used to close containers.

[0004] Certain aspects of the prior art can be improved upon.

[0005] First, it is desirable to ensure a highly secure seal of the container prior to opening, while making it easier and more convenient for the consumer to pull on the gripping element to open the container.

[0006] Secondly, it is desirable to make a closure that is simple and inexpensive while still providing the required airtight seal, particularly since it can reduce the amount of construction material used. Summary of the Invention

[0007] One object of the present invention is to provide a method and / or apparatus for manufacturing a pull-off closure that can overcome one or more of the aforementioned limitations and drawbacks of the prior art.

[0008] SUMMARY OF THE PRESENT EMBODIMENT One object of the present invention is to provide a pull-off closure for a container which replaces prior art pull-off closures.

[0009] One advantage is the availability of ring-pull closures, which are particularly easy and convenient to open while at the same time ensuring high sealing security of the closed container.

[0010] One advantage is that it allows for simple and cheap manufacture, especially since it uses less construction material.

[0011] In one embodiment, a method for manufacturing a ring-pull closure provides that a sheet of metal material is cut and drawn to obtain a plurality of shells, each having a central closure wall and a peripheral skirt wall, and each shell is scored, after drawing, to obtain at least one circumferentially extending score line that forms a line that will preferentially break upon tearing by pulling on a gripping element applied to the shell.

[0012] The invention may be better understood and practiced with reference to the attached drawings which illustrate some non-limiting examples. [Brief description of the drawings]

[0013] [Figure 1] FIG. 1 is a side view of an embodiment of a extractable closure for a container made in accordance with the present invention. [Diagram 2] FIG. 2 is a cross-sectional view of the closure of FIG. [Diagram 3] FIG. 3 is a view from the left of FIG. [Figure 4] FIG. 4 is a cross-sectional view of a shell that is part of the closure of FIG. 1 prior to application of a gripping element to the shell. [Diagram 5]FIG. 5 is a view from the right of FIG. [Figure 6] FIG. 6 shows a diagram of a circumferential score line scoring step of a manufacturing method for producing the closure of FIG. [Figure 7] FIG. 7 shows a diagram of a step of forming a protrusion on the tab portion of the shell by plastic deformation in the first embodiment. [Figure 8] FIG. 8 shows a diagram of a step of forming a protrusion on the tab portion of the shell by plastic deformation in the second embodiment. [Figure 8A] FIG. 8A shows an enlarged view of FIG. [Figure 9] FIG. 9 shows a diagram of a step of forming a protrusion on the tab portion of the shell by plastic deformation in the third embodiment. [Figure 9A] FIG. 9A shows an enlarged view of FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0014] With reference to the aforementioned figures, 1 generally illustrates a pull-out closure which can be used in particular to close the mouth of a container, for example a bottle (made of glass, PET, aluminium, etc.).

[0015] The retractable closure 1 may in particular comprise a ring-pull, i.e. pull-off, type closure. At least a part of the retractable closure 1 may in particular be made of a metallic material (e.g. aluminium). The retractable closure 1 comprises a gripping element 2 (e.g. a pull tab or a ring) which can be pulled by a user to remove the closure and open the container. The gripping element 2 may in particular be made of plastic (e.g. PE).

[0016] The extractable closure 1 may in particular comprise a shell 3, i.e. a conch, having a closing wall 4. The shell 3 may in particular be made of a metallic material, for example aluminium. The closing wall 4 may in particular be configured to close the upper mouth of a container. The shell 3 may in particular comprise a skirt wall 5. The skirt wall 5 may in particular be a cylindrical wall.

[0017] The skirt wall 5 may in particular extend downwardly from the periphery of the closure wall 4 and may in particular be configured to mate (eg of known type) with the neck of the container.

[0018] The shell 3 may in particular comprise a connecting portion 6. The closure wall 4 and the skirt wall 5 may in particular be connected by a connecting portion 6. The gripping element 2 may in particular extend from or be applied to the skirt wall 5 and in particular be configured to be pulled (upwards) by the consumer to remove the shell 3 and open the container. The gripping element 2 may in particular comprise a pull ring. The gripping element 2 may in particular comprise an upper end attached to a lower edge of the skirt wall 5. The gripping element 2 may in particular extend downwards from a lower edge of the skirt wall 5.

[0019] The extractable closure 1 may in particular comprise preferential detachment means attached to the shell 3 to facilitate removal of the shell 3 when the gripping element 2 is pulled. The preferential detachment means may in particular comprise at least one circumferential score line 7 arranged on a surface of the connecting part 6, in particular on a convex outer surface of the connecting part 6. The circumferential score line 7 may in particular extend at least one sixth, or at least one fifth, or at least one quarter of the rotation angle, so as to ensure removal of the shell 3 after the preferential detachment means is broken (by pulling on the gripping element 2).

[0020] The gripping element 2 and the preferential detachment means are configured such that by pulling on the gripping element 2, the preferential detachment means is torn and broken, causing the occlusion portion to be removed and lifted up, which comprises at least a portion of the occlusion wall 4 located above.

[0021] The extractable closure 1 may in particular comprise sealing means 8 arranged inside the shell 3 (in particular below the closure wall 4) and configured to seal the mouth of the container. The sealing means 8 may in particular comprise a seal applied and moulded directly to the inside of the shell 3 by compression moulding of a plastic (e.g. PE, EVA or other PVC-free material).

[0022] The circumferential score line 7 may in particular be arranged in a more radially peripheral position with respect to the sealing means 8 such that the circumferential score line 7 does not overlap the sealing means 8 .

[0023] Positioning the circumferential score lines 7 in this manner (on the connection portion 6 and / or at a more radially peripheral position relative to the sealing means 8) facilitates tearing open while maintaining a high airtight seal of the container prior to opening. In particular, the tearing operation to remove the opening can be performed without substantially disturbing the sealing means 8 located on the inside of the shell 3.

[0024] The preferential detachment means may in particular comprise at least one additional circumferential score line 9 arranged on the (outer and convex) surface of the coupling part 6. The additional circumferential score line 9 may in particular be arranged circumferentially spaced apart from the circumferential score line 7. The additional circumferential score line 9 may in particular be arranged in a more radially peripheral position with respect to the sealing means 8 such that the additional circumferential score line 9 does not overlap the sealing means 8. The additional circumferential score line 9 may in particular extend at least one sixth, or at least one fifth, or at least one quarter of the rotation angle so as to ensure detachment of the shell 3 after the preferential detachment means is broken (by pulling on the gripping element 2).

[0025] The additional circumferential score line 9 and the circumferential score line 7 may in particular be arranged symmetrically with respect to one another with respect to a vertical plane of symmetry passing through the grip element 2. The circumferential score line 7 may in particular be arranged on the connecting part 6 (in particular on the outer and convex surface of the connecting part 6) over the entire circumferential range or over a large part of the circumferential range. The additional circumferential score line 9 may in particular be arranged on the connecting part 6 (in particular on the outer and convex surface of the connecting part 6) over the entire circumferential range or over a large part of the circumferential range.

[0026] The preferential detachment means may in particular comprise at least one vertical score line and / or connecting line 10 arranged on the (outer) side of the shell 3. The vertical score line and / or connecting line 10 may in particular be arranged on the skirt wall 5 terminating near the grip element 2. The vertical score line and / or connecting line 10 may in particular be arranged to connect the grip element 2 to the circumferential score line 7. The preferential detachment means may in particular comprise at least one vertical score line and / or connecting line 11 arranged on the (outer) side of the shell 3 and in particular connecting the grip element 2 to the further circumferential score line 9.

[0027] A method for the manufacture of a extractable closure for a container, in particular for the manufacture of a extractable closure 1, is disclosed.

[0028] The manufacturing method may in particular comprise the step of providing a sheet of metallic material, for example aluminium. The manufacturing method may in particular comprise the step of cutting said sheet in order to obtain a plurality of sheet-like bodies. The manufacturing method may in particular comprise the step of drawing said sheet-like bodies in order to obtain from each of said sheet-like bodies a shell having a central closure wall 4 and a peripheral skirt wall 5.

[0029] The manufacturing method may in particular comprise a step of scoring said shells 3 after said drawing step, in order to obtain at least one circumferentially extending score line in each of the shells 3. The said scoring step may in particular be carried out in such a way that the circumferentially extending score line is located on the convex outer side surface of the joint of the shells 3 joining the central closure wall to the peripheral skirt wall.

[0030] The manufacturing method may in particular comprise the step of applying, on the inside of the shell 3, a sealing means 8 for sealing the mouth of the container. A circumferential score line may in particular be arranged in a more radially peripheral position than said sealing means 8, such that the circumferential score line does not overlap said sealing means.

[0031] The aforementioned cutting and drawing steps may in particular be carried out in a press by movement of a cutting means along a cutting axis and a drawing means along a drawing axis coinciding with the aforementioned cutting axis. This press may in particular comprise an inlet zone for the sheet to be processed, a pressing zone (cutting and drawing), a discharge zone for discharging the scrap metal sheet and a shell recovery zone. This press may in particular comprise a press of known type.

[0032] The manufacturing method may in particular comprise a step of forming one or more protrusions 12 on one side of each of said sheet-like bodies of said shells. In particular, two protrusions 12 can be formed on each sheet-like body or each shell. The formation of the one or more protrusions can in particular be achieved by plastic deformation without generating scrap, i.e. portions of material that are detached integrally from said sheet-like body or said shell and that have to be subsequently removed.

[0033] The protrusion or protrusions 12 are produced by plastic deformation, in particular carried out by punch means 13, 17 (drawing means and / or punching means and / or cutting means).

[0034] Forming one or more protrusions 12 on one side of the object may entail, particularly in the case of drawing, simultaneously forming one or more recesses on the opposite side of the object.

[0035] The plastic deformation suitable for forming the protrusions 12 may be such that it does not produce scores or through openings in the material, as in, for example, a simple drawing process, or it may be such that it produces scores or through openings (without scrap), as in, for example, a punching process involving cutting.

[0036] The formation of the protrusions 12 may in particular comprise a step of cutting the material using a punch means 17 with an "open" cutting profile (i.e. not in the form of a closed ring) so that the deformed material remains attached without expelling scrap.

[0037] The formation of the protrusions 12 may in particular comprise the formation of openings or slits in the sides, for example achieved by punching the material cutting on one side only, which may result in protrusions having shapes such as a half-cone (a type of protrusion) in particular.

[0038] A punch means having a blade (a combined punching and cutting effect) may be configured in particular to deform the material to produce protrusions and to cut the material to generate associated openings, holes or scores, in a manner similar to machining a metal sheet to form, for example, the teeth and holes of a grater, or the teeth and holes of a non-slip grid-like metal floor.

[0039] Punching with partial cuts with a non-closed cutting profile (without the formation of scrap) allows in particular the formation of a protrusion that defines an undercut, due to which a score or an opening or a hole is formed in the material, the undercut being defined by the inner surface of the protrusion surrounding said score, opening or hole.

[0040] The formation of one or more protrusions 12 may in particular comprise a plastic deformation carried out by a punch means 17 having at least one blade, the punch means 17 being configured to form a cut with the formation of at least one protrusion 12 and further to form a cut with the formation of an opening, or a hole, or a piercing score by plastic deformation without the formation of scrap.

[0041] The manufacturing method may in particular comprise a step of applying the gripping element 2 to said sheet-like body or to each of said shells by engaging an end of the gripping element 2 with the respective projection 12. This applying step may in particular comprise a step of directly overmolding the gripping element 2 to the respective corresponding sheet-like body or shell 3 (e.g. by plastic injection or compression overmolding). This applying step may in particular comprise a step of bonding, for example by interlocking and / or mechanically forcing, the end of the (preformed) gripping element to the respective corresponding projection 12.

[0042] As mentioned, the projections 12 may, among other things, define at least one aperture hole or score in the material. The projections 12 may, among other things, define at least one undercut that facilitates subsequent application of the gripping element 2 and improves firm and tenacious gripping of the element.

[0043] The aforementioned step of forming the protrusion(s) 12 (and the respective corresponding recess(es)) may in particular be performed during or after the aforementioned step of drawing the sheet-like body, or during or after the scoring step of scoring the shell. Each protrusion 12 may in particular be made in the tab portion 14 of the shell by means of punching means 13, 17, in particular having a small punch and a corresponding small die operating in the tab portion 14. Each protrusion 12 may protrude from the outside of the tab portion 14 (as in the embodiment of Figures 4 and 5) or from the inside of the tab portion 14 (as in the embodiment of Figures 7-9).

[0044] In particular, as in the embodiment of Figures 4-5, each protrusion 12 comprising at least one drawn portion of material without a through opening may be made by a punch means for drawing (such as for example punch means 13 of Figure 7). In the embodiment of Figures 8-9, each protrusion 12 comprising at least one cut and deformed portion of material with a through opening may be made by a punch means for punching and cutting (such as for example punch means 17 of Figure 8).

[0045] The gripping element 2 may in particular be attached to a tab 14 of the shell 3. The tab 14 may in particular be arranged to project downwards from the skirt wall 5.

[0046] An apparatus for manufacturing a retractable closure, in particular an apparatus usable for manufacturing the retractable closure 1 and for operating the manufacturing method described above, is disclosed.

[0047] The manufacturing device comprises in particular means for feeding a sheet of metal material, for example an aluminium sheet, which may in particular comprise feeding means of known type, for example roller, belt, mat, magnetic or even other type of conveyor, which will not be disclosed in more detail here.

[0048] The manufacturing device may in particular comprise cutting means for cutting the sheet supplied by the supply means. The cutting means for cutting may in particular be configured to cut a plurality of sheet-like (e.g. disk-shaped) bodies. The manufacturing device may in particular comprise means for drawing the sheet-like bodies cut by the cutting means. The drawing means may in particular be configured to produce a shell 3 from each drawn sheet-like body, the shell 3 having a central closure wall 4 and a peripheral skirt wall 5. The central closure wall and the peripheral skirt wall are in particular connected to each other by a connection 6.

[0049] The cutting and drawing means may comprise a single-acting (cutting and drawing) mechanical press for cap moulds, particularly suitable for multi-tool moulds, of known type, in particular adapted for use with pre-cut (aluminium) sheets.

[0050] The manufacturing apparatus may in particular comprise means for applying, inside the shell 3, a sealing means 8 (gasket) for sealing the mouth of the container. The means for applying the sealing means 8 may in particular comprise, for example, a lining machine of known type.

[0051] The manufacturing device may in particular comprise means for scoring the side (in particular the outer side) of the shell 3 produced by the drawing means described above. The scoring means may in particular be configured to produce at least one circumferential score line 7 and / or 9 on each shell. The scoring means may in particular be configured such that the circumferential score line is located on the connecting portion 6, in particular on the convex side of the connecting portion (on the outer side of the shell 3).

[0052] The scoring means (see schematic diagram in FIG. 6) comprises in particular at least one scoring tool 15 and at least one supporting counter tool 16. The scoring tool 15 may in particular be configured to mark at least one circumferential score line (in particular a non-through score) on one side of the shell 3 (in particular on the outer side of the shell). The supporting counter tool 16 may in particular be configured to receive and support the shell 3. The scoring tool 15 and the supporting counter tool 16 may in particular be movable relative to each other to introduce at least one closed position, in which the scoring tool 15 marks at least one circumferential score 7 or 9 on the outer side of the shell, and at least one open position, in which the shell 3 can be inserted into and / or removed from the supporting counter tool 16. In particular, the scoring tool 15 may be movable on command in both directions of movement F towards or away from the shell 3.

[0053] The scoring means may in particular be configured to form, on one side (outside) of the shell, at least one circumferential score line 7 and / or 9, and / or at least one vertical score line and / or connecting line 10 and / or 11 connecting the circumferential score line 7 and / or 9 to the grip element 2.

[0054] The manufacturing apparatus may in particular comprise application means for applying the gripping elements 2 to the skirt wall 5 of the shell 3. The manufacturing apparatus may in particular comprise a processing line along which the above-mentioned application means and the above-mentioned scoring means are arranged. The application means may in particular be arranged downstream of the scoring means.

[0055] The cutting means and the drawing means may in particular be arranged in the same press. The scoring means may in particular be arranged in a rotary machine.

[0056] The manufacturing device may in particular comprise means for forming one or more protrusions 12 on one side of said sheet-like body or of said shell 3, respectively, and one or more corresponding recesses on the opposite side of said sheet-like body or shell 3. The forming means may in particular be configured for forming the protrusions 12 and the corresponding recesses by plastic deformation using punching means 13 or 17 (for example by means of a punch and drawing or a punching / cutting die).

[0057] The manufacturing device may in particular comprise means for engaging the ends of the gripping elements 2 with the respective projections 12. The engaging means may in particular comprise means for overmolding the gripping elements 2 with the respective sheet-like body or shell 3. The engaging means may in particular comprise means for interlocking and / or forcibly coupling the ends of the gripping elements 2 with the respective projections 12.

Claims

1. A method for manufacturing a pull-off closure (1) for a container, the method comprising: providing a sheet of metallic material; cutting the sheet to obtain a plurality of sheet-like bodies; drawing the sheet-like bodies to obtain a shell (3) having a central closing wall (4) and a peripheral skirt wall (5) from each sheet-like body; engraving the shell (3) to obtain at least one circumferentially extending score line (7; 9) on each shell (3); wherein the engraving step is carried out after the drawing step.

2. The method according to claim 1, wherein the at least one circumferentially extending score line (7; 9) is arranged on a convex outer surface of a connecting portion (6) of the shell that connects the central closing wall (4) to the peripheral skirt wall (5).

3. The method according to claim 1 or 2, further comprising applying sealing means (8) for sealing the mouth of the container inside the shell (3), wherein the at least one circumferentially extending score line (7; 9) is arranged at a more peripheral position in the radial direction with respect to the sealing means (8) such that the at least one circumferentially extending score line does not overlap the sealing means.

4. forming one or more protrusions (12) on at least one side of each of the sealing body or the shell (3), in particular by plastic deformation using punching means (13, 17); applying the gripping element (2) to each of the sheet-like body or the shell (3) by engaging one end of the gripping element (2) with each of the one or more protrusions (12); wherein the applying step comprises, in particular, overmolding the gripping element (2) onto the corresponding sheet-like body or the shell, or locking and / or forcibly coupling the one end to the corresponding protrusion; wherein the step of forming the one or more protrusions (12) is carried out, in particular, during or after the step of drawing the sheet-like body, or during or after the step of engraving the shell.

5. ​ ​ ​ ​ The method according to claim 4, wherein the step of forming the one or more protrusions (12) comprises plastically deforming the material by the punching means (13; 17) without generating scrap.

6. The method according to claim 5, wherein the step of forming the one or more protrusions (12) comprises shearing the material together with the plastic deformation by a punch (17) having a cutting edge for performing at least one penetration opening at least partially defined by each respective protrusion (12), in particular for performing both shearing and plastic deformation, for each of the one or more protrusions (12).

7. The method according to claim 5, wherein the forming step comprises drawing the material by the punching means (13) for performing the drawing, so as to form the one or more protrusions (12) on one side and one or more corresponding depressions on the opposite side.

8. An apparatus for manufacturing a pull-off closure (1), wherein the apparatus comprises means for supplying a sheet of metallic material, means for cutting the sheet supplied from the supplying means, the means being configured to cut a plurality of sheet-like bodies, means for drawing the sheet-like body cut by the cutting means, the means being configured to form a shell (3) having a central closing wall (4) and a peripheral skirt wall (5) coupled by a connecting portion (6) from each sheet-like body, means for engraving the outside of the shell (3) made by the drawing means, the means being configured to make at least one circumferential score line (7; 9) on each shell, and means for applying a gripping element (2) to the shell (3). An apparatus.

9. The apparatus according to claim 8, wherein the engraving means is configured such that the at least one circumferential score line (7; 9) is arranged on the connecting portion (6), in particular on the convex surface of the connecting portion.

10. The engraving means comprises at least one engraving tool (15), and at least one supporting counter-tool (16). The at least one engraving tool is configured to emboss at least one score (7; 9; 10; 11) on the outside of the shell. ​ The at least one support counter tool (10) is configured to receive and support the shell (3), The apparatus according to claim 8 or 9, wherein the at least one engraving tool and the at least one support counter tool are movable relative to each other such that the at least one engraving tool (15) engraves at least one score (7; 9; 10; 11) on the outside of the shell in at least one closed position and the shell (3) can be inserted into or removed from the at least one support counter tool (16) in at least one open position.

11. The means for engraving is configured, using the gripping element (2), to form at least one circumferential score line on the outside of the shell and at least one vertical and / or connecting score line (10; 11) that joins the at least one circumferential score line (7; 9), the apparatus according to claim 8 or 9.

12. The apparatus according to claim 8 or 9, comprising a processing line on which the means for applying and the means for engraving are arranged, in particular, the means for applying is arranged downstream of the means for engraving, and the means for cutting and the means for necking are arranged, in particular, on the same press, and the means for engraving is arranged, in particular, on a rotary machine.

13. Means for forming one or more protrusions (12) on each one side of the necked sheet-like body of the shell (3), in particular by plastic deformation using punching means (13), Means for engaging one end of the gripping element (2) with each corresponding protrusion (12) of the one or more protrusions (12) comprising, The means for engaging particularly includes means for overmolding the gripping element (2) onto each corresponding sheet-like body or shell (3), The apparatus according to claim 8 or 9, wherein the means for engaging particularly includes means for interlocking and / or mechanically forcing the one end of the gripping element (2) to be coupled to each corresponding protrusion (12).

14. The means for forming the one or more protrusions (12) comprises punching means (13; 17) configured to perform plastic deformation of the material without generating scrap, The punching means in particular comprises punching means (17) having a cutting edge for performing shearing of the material together with at least one of the plastic deformations so as to form a through-opening at each of the one or more protrusions (12), which through-opening is at least partially defined by the respective corresponding protrusion (12). The punching means in particular comprises punching means (13) for performing a necking operation of the material so as to form the one or more protrusions (12) on one side or a plurality of corresponding depressions on the opposite side, the device according to claim 13. **Claim 15** A shell (3) comprising a closure wall (4), a skirt wall (5) and a connecting part (6), wherein the closure wall (4) is configured to close the upper mouth of the container, the skirt wall (5) extends downward from the periphery of the closure wall (4) and is configured to be coupled to the neck of the container, and the closure wall (4) and the skirt wall (5) are coupled to each other by the connecting part (6). A gripping element (2) extending from the skirt wall (5) and configured to be pulled so as to remove the shell and open the container. Priority removal means arranged on the shell (3) so as to facilitate removal of the shell (3) when the gripping element (2) is pulled. Comprising The priority removal means comprises at least one circumferential score line (7; 9) arranged on the convex outer surface of the connecting part (6), a pull-off closure. **Claim 16** Comprising one or more protrusions (12) provided on at least one side of each of the shell (3) or the sheet body. One end of the gripping element (2) is engaged with each of the one or more protrusions (12) by overmolding the gripping element onto the respective corresponding sheet-like body or shell, or by interlocking and / or forcing the one end onto the respective corresponding protrusion, the closure according to claim 15. **Claim 17** The at least one circumferential score line (7; 9) extends for a length of at least one-sixth, or at least one-fifth, or at least one-fourth of the circumferential angle, the closure according to claim 15 or 16. **Claim 18** Sealing means (8) arranged on the inner surface of the shell (3) and configured to seal the mouth of the container. The at least one circumferential score line (7; 9) is arranged at the outermost position in the radial direction with respect to the sealing means (8) such that the at least one circumferential score line (7; 9) does not overlap the sealing means (8). The closure according to claim 15 or 16.

19. The preferential removal means comprises at least one additional circumferential score line (7; 9) arranged on the convex outer surface of the connecting part (6). The at least one additional circumferential score line (9) is, in particular, arranged at a circumferential interval from the at least one circumferential score line (7). The at least one additional circumferential score line extends, in particular, over a length of at least one-sixth, or at least one-fifth, or at least one-fourth of the circumferential angle. The closure according to claim 15 or 16.

20. It comprises a sealing means (8) arranged on the inner surface of the shell (3) and configured to seal the mouth of the container. The at least one circumferential score line (7; 9) is arranged at the outermost position in the radial direction with respect to the sealing means (8) such that the at least one circumferential score line (7; 9) does not overlap the sealing means (8). The at least one additional circumferential score line (9) is arranged at the outermost position in the radial direction with respect to the sealing means (8) such that the at least one additional circumferential score line does not overlap the sealing means. The closure according to claim 19.

21. The at least one additional score line and the at least one score line are arranged symmetrically with respect to a vertical plane of symmetry passing through the gripping element (2). The closure according to claim 19.

22. The preferential removal means comprises at least one vertical and / or connecting score line (10; 11) arranged outside the shell (3). The at least one vertical and / or connecting score line (10; 11) is arranged on the skirt wall (5) and terminates in proximity to the gripping element so as to couple the gripping element (2) to the at least one circumferential score line (7; 9). The closure according to claim 15 or 16.

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