Cap for a container

Abstract

A cap for a container, comprising a lateral wall (2) extending around an axis (Z) and a transverse wall (3) arranged transversely to the axis (Z), a separation line (4) being provided on the lateral wall (2) for defining: a retaining ring (5) intended to retain an anchoring to a neck of the container; and a closure element (6) which can be removably engaged with the neck to open or close the container. The separation line (4) extends around the axis (Z) and is interrupted circumferentially to define a joining portion (8) which joins the retaining ring (5) and the closure element (6). The cap (1) also has a cut line (21) which extends in the lateral wall (2) transversely to the axis (Z) so that the separation line (4) is axially interposed between the retaining ring (5) and the cut line (21). Two connection bands are defined between the separation line (4) and the cut line (21) to retain the closure element (6) connected to the retaining ring (5).

Description

[0001] This application is a divisional application of Chinese Patent Invention Application No. 202080053679.4, filed on July 7, 2020, entitled "A lid for sealing a container". Technical Field

[0002] This invention relates to a cap for a container, and more particularly to a cap having a retaining ring that can be associated with the neck of the container, the cap also having a closing element that remains connected to the retaining ring after being opened. The cap according to the invention is specifically, but not exclusively, suitable for use with bottles intended to contain liquid substances. Background Technology

[0003] Existing bottle caps include a cup-shaped body with internal threads adapted to engage with the external threads of the bottle neck. The caps also include a tamper-evident ring attached to the cup-shaped body via multiple breakable elements. Upon initial opening of the cap, the cup-shaped body separates from the tamper-evident ring as the breakable elements break. The tamper-evident ring remains attached to the bottle neck, while the cup-shaped body can be unscrewed by the user, who separates the cup-shaped body from the bottle to access the bottle's contents. The cup-shaped body can then be screwed back onto the neck to reseal the bottle.

[0004] Sometimes, after the bottle is emptied, the user intentionally or unintentionally throws the cup-shaped body on the ground, while the bottle, along with its associated tamper-evident seal, is properly disposed of in the trash can.

[0005] To overcome this drawback, a cap with a retaining ring and a closing element has been proposed. The retaining ring can be associated with the neck of the bottle, and the closing element is connected to the retaining ring via a hinge. The closing element can rotate about the hinge between an open position and a closed position. In the open position, the user can access the contents of the bottle; in the closed position, the closing element prevents the user from accessing the contents of the bottle. The hinge keeps the closing element engaged with the retaining ring, and thus with the bottle, thereby preventing the closing element from being independent of the possibility of the bottle being thrown to the ground.

[0006] However, existing caps with hinges have the disadvantage of being quite complex to manufacture. In practice, the hinges are usually manufactured in the same mold that produces the cap (specifically, through injection molding or compression molding).

[0007] Therefore, special molds are required to manufacture existing hinged caps, which differ from those typically used to manufacture caps without hinges. These molds are more complex than ordinary molds, specifically because existing hinged caps may be equipped with undercuts, thus requiring special equipment to remove the cap from the mold.

[0008] Furthermore, existing caps with hinges may have areas with very little thickness, making it difficult to obtain these areas because the molten polymer material is difficult to flow into the mold's portion designed to form these areas.

[0009] This increases the production cost of the hinged cap and / or increases the production cycle required to obtain the hinged cap. Summary of the Invention

[0010] One object of the present invention is to improve the lids of the prior art, specifically lids comprising a retaining ring and a closing element, the retaining ring being designed to remain associated with the neck of the container, and the closing element being removably engaged with the neck to allow a user to open or alternatively close the container.

[0011] Another objective is to provide a lid of the type described above for containers that can be manufactured in a simple manner.

[0012] Another objective is to provide a lid for a container having a closure element that is connected to a retaining ring, the production of which does not require very complex molds.

[0013] According to the present invention, a lid for a container is provided, the lid comprising a sidewall extending about an axis and a transverse wall arranged transversely to the axis, wherein a dividing line is provided on the sidewall for defining: A retaining ring, designed to keep the anchor to the neck of the container, and A closure element that can be removably engaged with the neck to open or close the container; The separation line extends around the axis and is interrupted circumferentially to define a joint portion that combines a retaining ring and a closing element. The cap also has a cut line that extends transversely to the axis in the sidewall, such that the separation line lies axially between the retaining ring and the cut line. Two connecting bands are defined between the separation line and the cut line to keep the closure element connected to the retaining ring.

[0014] The connection allows the closure element to remain stably associated with the retaining ring, and thus with the neck of the container. This prevents the closure element from being discarded separately from the container. This increases the likelihood that the closure element, together with the container and with other waste of the same type as the closure element (specifically, waste made of plastic material), will be properly disposed of.

[0015] The lid according to the invention can be manufactured in a relatively simple manner without the need for special molds. In fact, if the cut line is made by a cutting operation, the lid according to the invention can be made in a conventional mold. A cut line that runs through the entire thickness of the sidewall can be obtained by a cutting operation, or a cut line that does not run through the entire thickness (at which the thickness of the sidewall is only partially cut).

[0016] However, it is also possible to form the cut line by molding inside the mold used to manufacture the cap, but since the shape of the cut line is particularly simple, it will not make the mold overly complex. In this case, the cut line can also be formed as a weakening line.

[0017] The connecting band and the joint together define a hinged arrangement whose axial movement capability is significantly greater than that allowed by the joint alone.

[0018] In practice, this hinged arrangement allows the closure element to move away from the tamper-evident ring along a larger axial distance defined by the combination of the length of the connecting strip and the length of the joint. This allows the closure element to be easily detached from the neck of the container and subsequently reapplied to it.

[0019] In one embodiment, a plurality of breakable bridging elements are provided along the separation line, the plurality of breakable bridging elements being adapted to break when the closure element is first brought to the open position.

[0020] In one embodiment, at least one of the plurality of breakable bridging elements is positioned such that it lies between one end of the cut line and the joint portion around an axis.

[0021] Therefore, the cap can achieve good stability during application to the neck, even when the cut line has a wide range of angles. Attached Figure Description

[0022] The invention can be better understood and practiced with reference to the accompanying drawings, which illustrate exemplary and non-limiting embodiments of the invention. Figure 1 This is a schematic rear view of a lid for a container in its closed position; Figure 2 yes Figure 1 The lid is shown in a perspective view of the following configuration, in which the closing element of the lid begins to move away from the retaining ring; Figure 3 yes Figure 1 The cover is in Figure 2 The structure is a cross-section taken along the plane containing the centerline of the joint, where the joint connects the closing element to the retaining ring; Figure 4 It is similar to Figure 1 A schematic rear view showing the closed element about to be brought into the open position. Detailed Implementation

[0023] Figures 1 to 4 A cap 1 is shown for sealing a container (specifically, a bottle intended to contain a liquid substance such as a beverage). The cap 1 is made of a polymeric material. Any polymeric material suitable for molding can be used to obtain the cap 1.

[0024] Figure 1 The image shows a cap 1 in a closed position, ready for application to a container upon leaving the cap production line. In this case, the cap 1 includes a sidewall 2 extending about an axis Z and a transverse wall 3 disposed at one end of the sidewall 2 to close that end. The transverse wall 3 extends transversely to (specifically, perpendicularly to) the axis Z. The transverse wall 3 can be flat, although other shapes are theoretically possible. In the example shown, the transverse wall 3 has a generally circular shape in the plan view.

[0025] The cover 1 has a separation line 4 located on the side wall 2 and extending about the axis Z. The separation line 4 extends in a plane arranged transversely to (specifically, perpendicular to) the axis Z. The separation line 4 defines a retaining ring 5 and a closing element 6 on the cover 1. The retaining ring and the closing element are located on opposite sides of the separation line 4. As described in more detail below, when the cover 1 is moved to the open position, the closing element 6 separates from the retaining ring 5 along the separation line 4.

[0026] The separation line 4 may be parallel to the free edge 16 of the cover 1. More specifically, the free edge 16 defines the retaining ring 5 on the side opposite to the transverse wall 3.

[0027] The separation line 4 does not extend around the axis Z across the entire 360° angle. The separation line 4 is interrupted in the circumferential direction to define a joint portion 8 on the sidewall 2, where the closing element 6 is held engaged with the retaining ring 5.

[0028] In other words, the separating line 4 has a first end 9 and a second end 10. The connecting portion 8 is located between the first end 9 and the second end 10. At the connecting portion 8, the retaining ring 5 is connected to the closing element 6.

[0029] like Figure 2 As shown, the connecting part 8 has an angular dimension W around the axis Z.

[0030] The connecting part 8 defines a hinge band, around which the closing element 6 can rotate after detaching from the neck of the container with the cover 1.

[0031] The hinge band extends between the two opposite end regions of the joint portion 8, that is, the hinge band extends from the region of the joint portion 8 immediately adjacent to the first end 9 to the region of the joint portion 8 immediately adjacent to the second end 10.

[0032] Therefore, in the absence of an arrow-shaped hinge or a reduced thickness area in the joint portion, the hinge band defined by the joint portion 8 affects the entire angular dimension W of the joint portion 8.

[0033] Therefore, when referring to any plane perpendicular to axis Z (e.g., the plane containing separation line 4), the thickness of the joint portion 8 can be approximately constant in that plane.

[0034] The connecting portion 8 can be defined by a smooth outer surface (specifically, an outer surface having the shape of a columnar portion).

[0035] Multiple breakable bridging components 71, 72...7 are provided along the separation line 4. n The plurality of fracture-resistant bridging components 71, 72...7 n Connect retaining ring 5 to closing element 6. Breakable bridging elements 71, 72…7 n Designed to break when the closure element 6 is first brought into the open position, indicating that the container is no longer intact. Specifically, 71 represents the breakable bridging element closest to the first end 9 of the separation line 4, while 7 n This refers to the breakable bridging component at the second end 10 closest to the separation line 4.

[0036] Fractureable bridging components 71, 72...7 n They can be spaced at equal angles along the separation line.

[0037] In the example shown, the closure element 6 has a cup-shaped body and includes a skirt 11 extending around axis Z. The skirt 11 is connected to a transverse wall 3, which is located at the end of the skirt 11 opposite to the separation line 4. Specifically, the skirt 11 is connected to the transverse wall 3 via a connecting region 12, which can be shaped in cross-section as a beveled edge or a rounded edge.

[0038] like Figure 3 As shown, the skirt 11 has a removable fastening device on its inner surface, through which the closure element 6 can be removably engaged with the neck of the container. The removable fastening device may include, for example, an internal thread 17 intended to engage with an external thread formed on the neck.

[0039] The skirt 11 may have a plurality of knurled lines 13 on its outer surface, which extend parallel to the axis Z and are adapted to help the user or the capping machine that applies the cap 1 to the container to be sealed to grip the cap 1.

[0040] The knurling 13 can also continue in the connecting area 12 and / or retaining ring 5.

[0041] The retaining ring 5 extends between the free edge 16 and the separation line 4. The retaining ring 5 may be defined by a cylindrical outer surface. Figure 1 In the closed position shown in the cover 1, the retaining ring 5 is coaxial with the closing element 6.

[0042] like Figure 3 As shown, the retaining ring 5 has an engagement device on its inner side, which may include a plurality of engagement elements 20 protruding inward from the retaining ring 5. The engagement elements 20 may be formed as a thickened portion of the retaining ring 5, that is, the thickness of the retaining ring 5 is greater than that of other areas of the retaining ring 5.

[0043] The engagement device is adapted to engage with a circular enlargement protruding from the outer surface of the neck. Specifically, when the cap 1 is first applied to the neck, the engagement device is located below the circular enlargement, that is, on the side of the circular enlargement facing the container body. The engagement device is configured to abut against the circular enlargement to prevent the retaining ring 5 from axially moving away from the neck when the closure element 6 is removed from the neck. Thus, the engagement device ensures that the retaining ring 5 remains engaged with the neck of the container when the closure element 6 is brought to the open position.

[0044] In an alternative embodiment (not shown), the engagement device may include a single annular element that bends around the free edge 16 toward the inside of the retaining ring 5. In another alternative embodiment (not shown), the engagement device may include multiple engagement elements shaped like tabs protruding from the free edge 16 and bending toward the inside of the retaining ring 5. Alternatively, the engagement device may include an enlargement, which may be continuous or discontinuous, protruding from the inner surface of the retaining ring 5 toward axis Z to engage with a circular enlargement at the neck.

[0045] like Figures 1 to 4 As shown, the cover 1 has a cut line 21 extending transversely (specifically, perpendicularly) to the axis Z on the side wall 2. The cut line 21 may be located in a plane arranged transversely (specifically, perpendicularly) to the axis Z.

[0046] More specifically, the cut line 21 is provided in the closure element 6, and the cut line can be located between the separation line 4 and the removable fastening device (by which the closure element 6 can be removably fixed to the neck of the container).

[0047] Thus, the separation line 4 lies axially between the retaining ring 5 and the cut line 21. This means that if an observer moves parallel to the axis Z from the free edge 16 toward the sidewall 3 in the region of the cover 1 where both the separation line 4 and the cut line 21 exist simultaneously, they will first encounter the retaining ring 5, then the separation line 4, and finally the cut line 21.

[0048] If the cover 1 is positioned in the same orientation as it has been applied to the container, i.e., with the transverse wall 3 facing upwards, then the cut line 21 is arranged at a horizontal height above the separation line 4. The cut line 21 is therefore arranged on the same side as the closure element 6 relative to the separation line 4.

[0049] The connecting portion 8 and the retaining ring 5 are arranged on the same side of the cut line 21. The cut line 21 defines the connecting portion 8 on the side of the connecting portion 8 furthest from the retaining ring 5 in a plane transverse to the axis Z.

[0050] The cut line 21 has one end 27 and another end 28, that is, the cut line extends between one end 27 and the other end 28.

[0051] The cut line 21 has an angular range A1 measured about axis Z, which is greater than the angular distance between the first end 9 and the second end 10 of the separation line 4 (i.e., the angular dimension W of the joining portion 8) (also measured about axis Z). The angular range A1 of the cut line 21 can be defined as the angular distance between one end 28 and the other end 27 of the cut line 21 (i.e., the angle measured about axis Z).

[0052] For example, the angle range A1 of the cut line 21 can be 150° to 200°, preferably greater than 180°. The angular dimension W of the connecting portion 8 around the axis Z (i.e., the angular distance between the first end 9 and the second end 10 of the separation line 4) can be 5° to 40°, preferably 10° to 30°.

[0053] In the example shown, the joining portion 8 is centered relative to the separation line 4. In other words, the midpoint of the separation line 4 and the center line of the joining portion 8 are aligned with each other in a direction parallel to the axis Z, meaning that the common plane containing the midpoint of the separation line and the center line of the joining portion includes the axis Z. However, this condition is not required, as even imprecise centering of the cut line 21 relative to the joining portion 8 is permissible.

[0054] In the example shown, the cut line 21 has a flat, curved shape. However, other shapes are also possible.

[0055] The cut line 21 and the separation line 4 may lie in corresponding parallel planes, but this condition is not required. For example, the cut line 21 and the separation line 4 may lie in planes that are slightly inclined relative to each other. Alternatively, the cut line 21 may include multiple extensions with different inclinations, which are not necessarily coplanar with each other.

[0056] The end 27 of the cut line 21 extends beyond the first end 9 of the separation line 4 relative to the centerline plane of the joint portion 8 outside the joint portion 8. The other end 28 is also outside the joint portion 8 but extends beyond the second end 10 of the separation line 4 relative to the centerline plane of the joint portion 8.

[0057] The cut line 21 includes an intermediate portion 24 located between an outer peripheral portion 25 and another outer peripheral portion 26. The intermediate portion 24 faces the joining portion 8. The outer peripheral portion 25 faces the separation line 4, specifically at the end portion of the separation line 4. More precisely, the outer peripheral portion 25 faces the separation line 4 in the region between the first end 9 of the separation line 4 and the end 27 of the cut line 21. The other outer peripheral portion 26 faces the separation line 4, specifically at the other end portion of the separation line 4. More precisely, the other outer peripheral portion 26 faces the separation line 4 in the region between the second end 10 of the separation line 4 and the other end 28 of the cut line 21.

[0058] A connecting band is defined between the outer periphery 25 of the cut line 21 and the portion of the separation line 4 starting from the first end 9 for retaining the closure element 6 to the retaining ring 5. Similarly, another connecting band is defined between the other outer periphery 26 of the cut line 21 and another portion of the separation line 4 starting from the second end 10 for retaining the closure element 6 to the retaining ring 5.

[0059] In the example shown, one connecting strip and another connecting strip are arranged symmetrically with respect to the plane containing axis Z and the center line of the connecting part 8.

[0060] The cut line 21 can be formed as a through cut that extends through the entire thickness of the sidewall 2.

[0061] One or more additional breakable bridging elements 18 are provided along the cut line 21, which connect the edge of the cut line 21 closest to the retaining ring 5 to the edge of the cut line 21 furthest from the retaining ring 5. The additional breakable bridging elements 18 are designed to break when the closing element 6 is first brought into the open position.

[0062] In the example shown, two additional breakable bridging elements 18 are arranged along the cut line. However, this condition is not mandatory. For example, the number of additional breakable bridging elements 18 can be equal to or greater than three.

[0063] In the example shown, one of the other breakable bridges 18 is arranged in a position that is about an axis between the first end 9 of the separation line 4 and the first breakable bridge 71 (i.e., the breakable bridge closest to the first end 9 of the separation line 4) disposed along the separation line 4.

[0064] The first fractureable bridging member 71 can be arranged at a small angular distance from the first end 9 of the separation line 4, for example less than 10°, preferably less than 5°.

[0065] Furthermore, another breakable bridging member of the other breakable bridging members 18 is arranged in a position that surrounds the axis between the second end 10 of the separation line 4 and the last breakable bridging member 7 disposed along the separation line 4. n (i.e., between the breakable bridging member closest to the second end 10 of the separation line 4).

[0066] The final fractureable bridging component 7 n It can be arranged at a small angular distance of 10 from the second end of the separation line 4, for example less than 10°, preferably less than 5°.

[0067] When the cap 1 is first applied to the neck of the container by the capping machine, the other breakable bridging elements 18 along the cut line 21 are helpful because these other breakable bridging elements hold the opposing edges of the cut line 21 together, thereby preventing excessive deformation in the area of ​​the joint 8.

[0068] The fractured bridging elements 71, 72...7 are arranged along the separation line 4. n Other breakable bridging elements 18 can be arranged in staggered positions around axis Z relative to other elements 18 set along the cut line 21.

[0069] Multiple fracture-resistant bridging elements 71, 72...7 are arranged along the separation line 4. n At least one breakable bridging member 71 is located around axis Z between the joint portion 8 (or more specifically, the first end 9 of the separation line 4) and the end 27 of the cut line 21.

[0070] In the example shown, at least two breakable bridging elements 71, 72 arranged along the separation line 4 can be positioned around axis Z between the joint portion 8 and the end 27 of the cut line 21. Multiple breakable bridging elements 71, 72...7 n Another breakable bridging element can be axially aligned or nearly axially aligned with the end 27 of the cut line 21.

[0071] In addition, multiple breakable bridging elements 71, 72...7 are provided along the separation line 4. n At least one of the fractured bridging components 7n The axis Z is located between the joint portion 8 (or more specifically, the second end 10 of the separation line 4) and the other end 28 of the cut line 21.

[0072] In the example shown, at least two breakable bridging elements 7 are arranged along the separation line 4. n-1 7 n It can be positioned around axis Z between the joint portion 8 and the other end 28 of the cut line 21. Multiple breakable bridging elements 71, 72…7 n Another fracture-prone bridging component 7 n-2 It can be axially aligned or nearly axially aligned with the other end 28 of the cut line 21, such as Figure 3 As shown.

[0073] Fractureable bridging components 71, 72...7 n This distribution allows for the avoidance of excessive deformation of the retaining ring 5, one connecting strip, and the other connecting strip, especially when the cap 1 is first applied to the neck by the capping machine. This is particularly useful when the angle range A1 of the cut line 21 is large (e.g., close to 180° or greater).

[0074] Cover 1 in Figure 1 The closed position shown is applied to the neck of the container. The cap 1 is positioned such that the engaging element 20, which is located on the inside of the retaining ring 5, is below the circular enlargement on the neck.

[0075] When a user first attempts to open the container, they grasp the skirt 11 of the closure element 6 and rotate the closure element 6 about axis Z to unscrew it from the neck. Initially, the closure element 6 and the retaining ring 5 rotate together about axis Z, and they simultaneously move together away from the neck in a direction parallel to axis Z. This continues until the engaging element 20 of the retaining ring 5 abuts against the circular enlargement provided on the neck. At this point, the circular enlargement of the neck acts as a stop to prevent the retaining ring 5 from moving further away from the neck, preventing the retaining ring 5 from rising further along axis Z.

[0076] The closure element 6, loosened by the user, continues to move away from the neck along axis Z. Breakable bridging elements 71, 72…7 n Other fractured bridging components 18 are thus tightened, such as Figure 2 and Figure 3 As shown.

[0077] Continue unscrewing the sealing element 6, which acts on the fracture bridging components 71, 72...7 n The tensile strain on other fractured bridging elements 18 leads to fractured bridging elements 71, 72...7 n Other fractured bridging components 18 fracture, such as Figure 4 As shown.

[0078] The closing element 6 is therefore separated from the retaining ring 5 along the separation line 4, but remains engaged with the retaining ring 5 at the engagement portion 8.

[0079] The first connecting strip 29 and the second connecting strip 30 are then separated from the adjacent area of ​​the closing element 6.

[0080] Furthermore, the first connecting band 29 and the second connecting band 30 deform. Specifically, by moving the closing element 6 upward, the first connecting band 29 and the second connecting band 30 are also pulled upward. Therefore, the first connecting band 29 and the second connecting band 30 are spaced apart from both the retaining ring 5 and the closing element 6 and remain connected to each other in the connecting portion 8.

[0081] The first connecting belt 29 and the second connecting belt 30 thus adopt the following... Figure 2 The diagram shows an inverted trapezoidal shape, with the neck of the container not shown. In this configuration, the first connecting band 29 is held attached to the closure element 6 at one end 27 of the cut line 21. Similarly, the second connecting band 30 is held attached to the closure element 6 at the other end 28 of the cut line 21.

[0082] The first connecting band 29 and the second connecting band 30 are joined together in the joining portion 8.

[0083] In other words, the first connecting band 29 and the second connecting band 30 are arranged in a construction that is inclined relative to the retaining ring 5 and converge in the connecting portion 8.

[0084] Continue unscrewing the closure element 6, which disengages from the external threads formed on the neck, thereby allowing the container to be opened. Conversely, the retaining ring 5 remains anchored to the neck. The first connecting band 29, the second connecting band 30, and the connecting portion 8 form a hinged arrangement about which the closure element 6 can rotate to allow the user access to the contents of the container.

[0085] Specifically, after the closing element 6 has detached from the neck, by moving the closing element 6 about the hinge arrangement, the closing element 6 can be moved to a lateral position relative to the neck, so that the closing element 6 is no longer coaxial with the retaining ring 5.

[0086] After use, the user can return to the previous state by performing a series of operations in reverse order compared to the previously described sequence. Figure 1 The closed position shown.

[0087] The first connecting band 29 and the second connecting band 30 result in a longer hinged arrangement than the hinged arrangement available when only the hinged band defined by the connecting portion 8 is present. This makes it easier to detach the closing element 6 from the neck by rotating it about the hinged arrangement and to reapply the closing element 6 to the neck.

[0088] Fractureable bridging components 71, 72...7 n Other fracture-resistant bridging elements 18 ensure that the cap 1 maintains sufficient rigidity when it is first applied to the container, even when the cut line 21 has a large angle range A1.

Claims

1. A lid for a container, the lid comprising a sidewall extending about an axis and a transverse wall arranged transversely to the axis, wherein a separating line is provided on the sidewall for defining: A retaining ring, the retaining ring being designed to maintain anchorage to the neck of the container, and A closure element that can be removably engaged with the neck to open or close the container; in, The separation line extends around the axis and terminates circumferentially to define a joining portion that combines the retaining ring and the closing element. The cover also has a cut line that extends transversely to the axis in the sidewall, such that the separation line is axially located between the retaining ring and the cut line. Two connecting bands are defined between the separation line and the cut line to keep the closure element connected to the retaining ring. Wherein, the angle range of the cut line around the axis is greater than 180°. A plurality of breakable bridging elements are provided along the separation line, the plurality of breakable bridging elements being adapted to break when the closure element is first brought to the open position, wherein at least one of the plurality of breakable bridging elements is arranged in a position that is located around the axis between one end of the cut line and the joint portion.

2. The cover according to claim 1, wherein, Two of the plurality of breakable bridging elements are arranged in a position that is located around the axis between one end of the cut line and the joint portion.

3. The cover according to claim 1, wherein, The fractured bridging member of the plurality of fractured bridging members is substantially aligned in the axial direction with one end of the cut line.

4. The cover according to claim 1, wherein, A plurality of other breakable bridging elements are provided along the cut line, at least one of the plurality of other breakable bridging elements being arranged in a position such that the position is located around the axis between the joint portion and the breakable bridging element closest to the joint portion among the plurality of breakable bridging elements.

5. The cover according to claim 1, wherein, The angle range of the cut line around the axis is less than 200°.

6. The cover according to claim 1, wherein, The joint portion has a substantially constant thickness in a plane perpendicular to the axis.

7. The cover according to claim 1, wherein, One of the two connecting bands is defined between an outer periphery of the cut line and an end portion of the separation line, and the other connecting band is defined between another outer periphery of the cut line and another end portion of the separation line.

8. The cover according to claim 7, wherein, The one connecting strip and the other connecting strip are arranged symmetrically with respect to the plane containing the axis and the center line of the joint portion.

9. The cover according to claim 1, wherein, The cut line and the separation line extend in corresponding parallel planes.

10. The cover according to claim 1, wherein, The connecting portion has an angular dimension about the axis, the angular dimension being 5° to 40°.

11. The cover according to claim 1, wherein, The closure element is provided with an internal thread adapted to engage with the external thread of the neck.

12. The cover according to claim 10, wherein, The angular dimension of the joint portion around the axis is 10° to 30°.

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