Cap, cap and neck combination structure for closing container

Abstract

A cover for a container, the cover for the container includes a side wall extending around an axis and a transverse wall arranged at the end of the side wall. A separation line is provided on the side wall to define: a retaining ring, the retaining ring is intended to remain anchored to the neck of the container, and a closure element, the closure element can be removably engaged with the neck to open or close the container. The separation line extends around the axis and is interrupted in the circumferential direction to leave a bonding portion between the retaining ring and the closure element. The cover also has a cut line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cut line, which connect the retaining ring to the bonding portion. The connecting band has a radial thickness measured in the radial direction and has a height measured parallel to the axis. The ratio between the height of the connecting band and the radial thickness is greater than or equal to 1.4 and less than or equal to 6.5.

Description

[0001] The present invention relates to a cap for a container, in particular to a cap having a retaining ring which can be associated with the neck of the container, the cap also having a closure element which remains connected to the retaining ring after opening. The cap according to the invention is particularly, but not exclusively, suitable for application to bottles intended to contain liquid substances.

[0002] The invention also relates to a combined structure of a lid and a neck of a container.

[0003] Furthermore, the invention relates to a method for producing a cap for a container.

[0004] Caps for bottles are known, which include a cup-shaped body provided with an internal thread adapted to engage with an external thread of the neck of the bottle. The known caps are also provided with an anti-tampering ring connected to the cup-shaped body by a plurality of breakable elements. When the cap is opened for the first time, the cup-shaped body is separated from the anti-tampering ring due to the breaking of the breakable elements. The anti-tampering ring remains associated with the neck of the bottle, while the cup-shaped body can be unscrewed by the user, thereby separating the cup-shaped body from the bottle to access the contents of the bottle. Subsequently, the cup-shaped body can be screwed onto the neck again to reclose the bottle.

[0005] Sometimes, after the bottle has been emptied, the user intentionally or accidentally drops the cup-shaped body on the ground, whereas the bottle, together with its associated tamper-evident ring, is properly disposed of in a trash can.

[0006] In order to overcome this drawback, a cap has been proposed which is provided with a retaining ring which can be associated with the bottle neck and a closure element which is connected to the retaining ring by a hinge. The closure element can be rotated about the hinge between an open position, in which the user can access the contents of the bottle, and a closed position, in which the user is prevented from accessing the contents of the bottle. The hinge keeps the closure element associated with the retaining ring and therefore with the bottle, thereby preventing the closure element from being thrown to the ground independently of the bottle.

[0007] Yet, known lids that are provided with hinges have the disadvantage of being quite complicated to manufacture.In fact, hinges are usually produced in the same mould from which the lid is obtained (particularly by injection moulding or compression moulding).

[0008] In order to produce closures of known type with hinges, special moulds must therefore be provided, which are different from the moulds usually used for producing closures without hinges. These moulds are more complex than ordinary moulds, in particular, since closures of known type with hinges may have undercuts, which require special means for removing the closures from the moulds.

[0009] Furthermore, lids of known type with hinges may have areas of very small thickness which are difficult to obtain due to the difficulty of the molten polymer material flowing in the parts of the mould intended to form these areas.

[0010] This increases the production costs of the lid with hinge and / or increases the production cycle required to obtain the lid with hinge.

[0011] In known types of lids with hinges, the closure element sometimes recloses prematurely after being moved into the open position by rotating about the hinge. It may also happen that the closure element partially rotates about the hinge and thus moves into a vertical or almost vertical configuration. In these cases, the closure element may hit the face of a user who is drinking from a bottle with a lid with hinges in an unwelcome manner, or the closure element may intervene in a desired manner between the bottle and a container, such as a glass, into which the liquid contained in the bottle is poured.

[0012] Furthermore, in known types of lids with hinges, the retaining ring associated with the neck can rotate freely around the neck itself when the closure element has been moved to the open position. It can therefore happen that when the user drinks the liquid contained in the bottle to which the lid with hinges is applied, or when pouring the liquid contained in the bottle into a glass, the retaining ring rotates around the neck together with the closure element under the effect of gravity. If this happens, the closure element can hit the face of the user who is drinking, or come between the neck of the bottle and the glass, thereby preventing the liquid from being dispensed into the glass.

[0013] The object of the present invention is to improve a closure of known type, in particular a closure comprising a retaining ring intended to remain associated with the neck of a container and a closure element removably engageable with the neck to allow the user to open or alternatively close the container.

[0014] Another object is to provide a cap for a container of the above-mentioned type which can be produced simply.

[0015] Another object is to provide a cap for a container provided with a closure element which is retainingly connected to a retaining ring, the production of which does not require a very complex mould.

[0016] Another object is to provide a cap for a container comprising a closure element which is stay connected to a retaining ring, wherein the closure element remains stable in the open position.

[0017] Another object is to provide a cap for a container in which the risk of the closure element accidentally hitting the face of a user in the open position or preventing the dispensing of the substance contained in the container into a glass or the like is reduced.

[0018] In a first aspect of the present invention, a combined structure of a lid and a neck of a container is provided.

[0019] wherein the neck is defined by an outer surface from which a circular enlargement projects, the outer surface extending upwardly to the edge of the neck,

[0020] And wherein the cover comprises a side wall extending around the axis, and a separation line is provided on the side wall for defining:

[0021] - a retaining ring intended to engage with the circular enlargement to maintain the anchoring to the neck, and

[0022] a closure element removably engageable with the neck so as to be movable between a closed position and an open position,

[0023] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a bonded portion between the retaining ring and the closing element,

[0024] wherein the cover further comprises a cut line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting strips are defined between the separation line and the cut line, which connect the retaining ring to the connecting portion, and

[0025] Therein, the connecting band is deformable to allow the engaging portion to rotate when the closure element moves from the closed position to the open position so that the edge of the engaging portion facing the retaining ring in the closed position faces the edge of the neck in the open position.

[0026] Due to this aspect of the invention, a lid that can be stably kept in the open position can be obtained. In fact, when the closure element is rotated from the closed position to the open position, the coupling part rotates, and at this time, interference occurs between the coupling part and the neck of the container. Even in the open position, this interference still exists. In order to return the closure element to the closed position, a predetermined force must be applied to the closure element to overcome the interference between the neck and the coupling part. This makes it difficult (if not impossible) for the closure element to return to the closed position by itself.

[0027] In more detail, in the open position, the engaging portion is located on the neck of the container, and the deformed connecting band exerts a force on the engaging portion that tends to keep the engaging portion in contact with the neck of the container. This causes interference between the engaging portion and the neck of the container, which stably holds the closure element in the open position.

[0028] The rotation of the cap (particularly the retaining ring) around the neck is also hindered due to the interference between the engaging portion and the neck.

[0029] In an embodiment, the connecting strip may be deformed by a twisting movement when the closure element is moved from the closed position to the open position.

[0030] This twisting movement may affect at least a portion of the height of each connecting strip, the height being defined as the dimension of the connecting strip in a direction parallel to the axis when the closure element is in the closed position.

[0031] This enables the joining part to be rotated as described above without providing a break line or weakening line between the joining part and the connecting strip, thereby facilitating the production of the cap.

[0032] As the coupling portion rotates and the edge of the coupling portion slides in contact with the neck until the coupling portion reaches an open position (in the open position, the edge of the coupling portion faces the edge of the neck), interference is generated between the coupling portion and the neck. When the coupling portion is approximately perpendicular to the neck, the interference reaches a maximum value, and the interference decreases (but does not reach a zero value) after the coupling portion is flipped over and positioned on the neck with the edge facing upward.

[0033] The user moving the closure element towards the open position notices that the closure element has passed the position of maximum interference due to a certain vibration felt by his / her hand, which makes him / her aware that the closure element has been stably moved to the open position. This is welcomed by users who want to be sure that the container has been opened correctly.

[0034] In a second aspect of the invention, there is provided a combination of a cap for a container and a neck of the container, wherein the neck is defined by an outer surface from which a circular enlargement projects, the outer surface extending upwardly to a rim of the neck, the rim facing upwardly in an operating state, and wherein the cap comprises a side wall extending around an axis, on which a separation line is provided for defining:

[0035] - a retaining ring intended to engage with the circular enlargement to maintain the anchoring to the neck, and

[0036] a closure element removably engageable with the neck so as to be movable between a closed position and an open position,

[0037] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a joining portion between the retaining ring and the closing element, the cover also having a cutout line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cutout line, the two connecting bands joining the retaining ring to the joining portion, the connecting bands being deformable by a torsional movement that affects at least a portion of the height of each connecting band, so that when the closing element moves from the closed position to the open position, the joining portion rotates relative to the connecting bands, and the edge of the joining portion facing the retaining ring in the closed position is positioned above the circular expansion portion at least in its middle portion, thereby generating interference between the joining portion and the neck, which interference holds the closing element in the open position.

[0038] Due to the second aspect of the present invention, the closing element can be prevented from returning to the closed position prematurely. In addition, the interference between the binding part and the neck (and possibly also the interference between the connecting band and the neck) prevents the retaining ring from rotating freely around the neck together with the closing element connected thereto when the lid is opened.

[0039] In a third aspect of the invention, there is provided a combination of a cap for a container and a neck of the container, wherein the neck is defined by an outer surface from which a circular enlargement projects, the outer surface extending upwardly to the edge of the neck, and wherein the cap comprises a side wall extending around an axis, on which a separation line is provided for defining:

[0040] - a retaining ring intended to engage with the circular enlargement to maintain the anchoring to the neck, and

[0041] a closure element removably engageable with the neck so as to be movable between a closed position and an open position,

[0042] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a bonded portion between the retaining ring and the closure element, the cover also having a cutout line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cutout line, which connect the retaining ring to the bonded portion, wherein each connecting band includes a first portion adjacent to the separation line and a second portion adjacent to the cutout line, and when the closure element moves from the closed position to the open position, the first portion is configured to expand radially so that the second portion twists and passes under the first portion.

[0043] In the third aspect of the present invention, deformation of the connecting band generates interference between the engaging portion and the neck of the container, which interference can stably hold the closure element in the open position.

[0044] In an embodiment of the aforementioned aspect of the invention, the distance between the separation line and the cut line is equal to or greater than 0.8 times half of the difference between the outer diameter of the circular expansion and the diameter of the outer surface of the neck immediately above the circular expansion.

[0045] More specifically, the distance between the separation line and the cut line is equal to or greater than 1.5 times half of the difference between the outer diameter of the circular enlarged portion and the diameter of the outer surface of the neck immediately above the circular enlarged portion.

[0046] The above distance is measured parallel to the axis of the side wall when the closing element is in the closed position. This distance therefore corresponds to the height of the connecting strip.

[0047] Experiments have shown that the value of the distance between the separation line and the cut line ensures that the connecting strip is correctly deformed when the closure element is moved from the closed position to the open position. Specifically, if the distance between the separation line and the cut line meets the above conditions, an interference state is generated between the coupling portion and the neck, which is very conducive to keeping the closure element in the open position.

[0048] Preferably, the distance between the separation line and the cut line is equal to or greater than 2 times half of the difference between the outer diameter of the circular enlarged portion and the diameter of the outer surface of the neck immediately above the circular enlarged portion.

[0049] Even more preferably, the distance between the separation line and the incision line is equal to or greater than 2.5 times half of the difference between the outer diameter of the circular enlargement and the diameter of the outer surface of the neck immediately above the circular enlargement.

[0050] In a fourth aspect of the present invention, there is provided a combined structure of a lid for a container and a neck of the container,

[0051] wherein the neck is defined by an outer surface from which a circular enlargement projects, the outer surface extending upwardly to the edge of the neck, and wherein the cap comprises a side wall extending about the axis and on which a separation line is provided for defining:

[0052] - a retaining ring intended to engage with the circular enlargement to maintain the anchoring to the neck, and

[0053] a closure element removably engageable with the neck so as to be movable between a closed position and an open position,

[0054] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a joining portion between the retaining ring and the closing element, the cover also having a cutout line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cutout line, which connect the retaining ring to the joining portion, and wherein the distance between the separation line and the cutout line is equal to or greater than 0.8 times of half of the difference between the outer diameter of the circular expansion portion and the diameter of the outer surface of the neck immediately above the circular expansion portion, and the distance is preferably equal to or greater than 1.5 times of half of the difference.

[0055] In the combined structure according to the fourth aspect of the present invention, there is an interference state between the engaging portion and the neck, which is very conducive to keeping the closing element in the open position.

[0056] In an embodiment of the aforementioned aspect of the invention, the engaging portion has a dimension angle around the axis of the side wall which is greater than or equal to 20°, preferably greater than or equal to 25°.

[0057] In an embodiment of the aforementioned aspect of the invention, the engaging portion has a dimension angle around the axis of the side wall which is less than or equal to 120°, preferably less than or equal to 90°.

[0058] Thus, the engaging portion cannot be too wide about the axis of the side wall, which would make it difficult to flip the engaging portion (ie, the edge of the engaging portion from a configuration facing the retaining ring to a configuration facing the rim of the neck).

[0059] At the same time, the engaging portion cannot be too narrow with respect to the axis of the side wall, since an excessively narrow engaging portion would result in insufficient interference between the engaging portion and the neck to stably hold the closure element in the open position.

[0060] In an embodiment of the aforementioned aspect of the invention, the neck is provided with at least one fixing element adapted to engage with the closure element such that the closure element is removably fixed to the neck.

[0061] At least one fixing element may include a thread having one or more starting points.

[0062] Preferably, but not necessarily, the distance between the circular enlargement and the at least one fixing element is greater than or equal to half the distance between the separation line and the incision line.

[0063] Thus, there is space between the circular enlargement and the at least one fixing element sufficient to receive the engaging portion without the edges of the engaging portion interfering with the at least one fixing element.

[0064] In an embodiment of the aforementioned aspect of the invention, the circular enlargement is defined by a frustoconical surface towards the edge of the neck.

[0065] In an embodiment of the aforementioned aspect of the invention, the angle formed by a generatrix of the frustoconical surface and a line parallel to the longitudinal axis of the neck is less than or equal to 35°.

[0066] Preferably, the above angle is 30°.

[0067] As a result, the closure element can be easily positioned in an open position in which it forms a sufficiently large opening angle with the neck.

[0068] In an embodiment of the aforementioned aspect of the invention, the separation line extends in a portion of the side wall provided with the plurality of knurling lines.

[0069] That is, the separation line intersects the knurling line provided on the side wall of the cover.

[0070] This allows the height of the connecting strip to be maximised without compromising the ability of the user or capper to grip the cap.

[0071] Alternatively, the separation line may extend in a portion on the outside of the side wall that is defined by a smooth surface (ie, a surface without a knurling line).

[0072] In a fifth aspect of the present invention, there is provided a cover for a container, the cover comprising a side wall extending around an axis and a transverse wall arranged at an end of the side wall, a separation line being provided on the side wall for defining:

[0073] - a retaining ring intended to remain anchored to the neck of the container, and

[0074] - a closure element which can be removably engaged with the neck in order to open or close the container;

[0075] In which the separation line extends around the axis and is interrupted in the circumferential direction to leave a bonding portion between the retaining ring and the closing element, the cover also has a cut line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cut line, and the two connecting bands connect the retaining ring to the end area opposite to the bonding portion.

[0076] The engaging portion makes it possible to keep the closure element stably associated with the retaining ring and thus with the neck of the container. This prevents the closure element from being thrown on the ground separated from the container. This therefore increases the likelihood that the closure element is correctly disposed of together with the container together with waste of the same type, in particular with waste of plastic material.

[0077] The cover according to the fifth aspect of the invention can be produced in a relatively simple manner without the use of a special mould. In fact, the cover according to the fifth aspect of the invention can be produced in a conventional mould if the cut line is formed by a cutting operation. The cutting operation can obtain a cut line through the entire thickness of the side wall, or a cut line that does not pass through the entire thickness of the side wall by only partially cutting the thickness of the side wall at the cut line.

[0078] However, the cut line can also be produced by molding in a mold for producing the cap, but since the shape of the cut line is particularly simple, the mold is not overly complicated. In this case, the cut line can even be shaped as a weakening line.

[0079] Since the cut line is located between the separation line and the free edge of the retaining ring, the cut line does not weaken the joining portion. In the cap according to the invention, the joining portion is therefore relatively strong, which makes it more difficult to accidentally separate the retaining ring from the closure element.

[0080] The connecting strap together with the joining portion defines an articulated arrangement whose movement capability in the axial direction is significantly greater than that allowed by the joining portion alone.

[0081] In fact, this hinged arrangement can make the closure element move away from the retaining ring along a considerable axial distance, which is determined by the combination of the length of the connecting band and the length of the engaging portion.Thus, the closure element can easily be disengaged from the neck of the container.

[0082] In an embodiment, the engaging portion has a dimension angle around the axis of the side wall which is greater than or equal to 20°, preferably greater than or equal to 25°.

[0083] In an embodiment, the engaging portion has a dimension angle around the axis of the side wall which is smaller than or equal to 120°, preferably smaller than or equal to 90°.

[0084] This allows the engaging part to rotate when the closure element moves from the closed position to the open position, so that the edge of the engaging part that faces the retaining ring in the closed position faces the edge of the neck in the open position. Thus, the advantages previously described with reference to the first aspect of the invention can be obtained, in particular with respect to the advantages that the closure element is stably held in the open position.

[0085] In an embodiment, the connection bands may be arranged symmetrically to each other with respect to a plane including an axis of the side wall and a center line of the coupling portion.

[0086] This symmetrical shape allows reducing unintended movements of the closing element when the cover is in the open position, in particular limiting lateral movements of the closing element.

[0087] In an embodiment, the bonding portion has a substantially constant thickness in a plane containing the separation line.

[0088] This makes the cap according to the fifth aspect of the invention easier to manufacture as no special moulds are required to produce the triangular hinges or very thin join lines.

[0089] In a sixth aspect of the present invention, there is provided a cover for a container, the cover comprising a side wall extending around an axis and a transverse wall arranged at an end of the side wall, a separation line being provided on the side wall for defining:

[0090] - a retaining ring intended to remain anchored to the neck of the container, and

[0091] - a closure element which can be removably engaged with the neck in order to open or close the container;

[0092] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a joining portion between the retaining ring and the closing element, the cover also having a cut line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cut line, which connect the retaining ring to the joining portion, the connecting bands having a radial thickness measured in a radial direction relative to the axis, the connecting bands also having a height measured parallel to the axis, and wherein the ratio between the height of the connecting band and the radial thickness is greater than or equal to 1.4, and the ratio is less than or equal to 6.5.

[0093] This value of the ratio between the height and the radial thickness of the connecting strip ensures that the connecting strip has an optimal torsional rigidity to undergo a torsional movement which causes the coupling part to rotate relative to the connecting strip and to rest on the neck above the circular enlargement. Thus, an interference is created between the neck and the coupling part which is sufficient to hold the closure element in the open position in a reliable and secure manner.

[0094] In a seventh aspect of the present invention, there is provided a cover for a container, the cover for a container comprising a side wall extending around an axis and a transverse wall arranged at an end of the side wall, a separation line being provided on the side wall for defining:

[0095] - a retaining ring intended to remain anchored to the neck of the container, and

[0096] - a closure element which can be removably engaged with the neck in order to open or close the container;

[0097] wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a joining portion between the retaining ring and the closing element, the cover also having a cut line extending transversely to the axis between the separation line and the free edge of the retaining ring, so that two connecting bands are defined between the separation line and the cut line, which connect the retaining ring to the joining portion, the cut line and the separation line are cutting lines, wherein a plurality of breakable bridges are arranged along the separation line, and a plurality of breakable elements are arranged along the cut line, the breakable bridges and the breakable elements are intended to break when the cover is opened for the first time, wherein the cut line includes an outer peripheral portion, another outer peripheral portion and an intermediate portion between the outer peripheral portion and the other outer peripheral portion, and wherein the cut line is located in a plane arranged perpendicular to the axis.

[0098] In an eighth aspect of the present invention, there is provided a method comprising the following steps:

[0099] - producing a cover for a container, the cover comprising a side wall extending around an axis and a transverse wall arranged at the end of the side wall,

[0100] - a separation line is provided on the side wall for defining: a retaining ring intended to remain anchored to the neck of the container; and a closure element which can be removably engaged with the neck to open or close the container, wherein the separation line extends around the axis and is interrupted in the circumferential direction to leave a bonded portion between the retaining ring and the closure element,

[0101] A cut line is formed extending transversely to the axis so that two connection strips are defined between the separation line and the cut line, which connect the retaining ring to the connection part.

[0102] The method according to the eighth aspect of the invention makes it possible to obtain in a particularly simple manner a cap in which the closing element remains associated with the retaining ring.

[0103] In an embodiment, the separation lines and the incision lines are formed by cutting.

[0104] The invention may be better understood and implemented with reference to the accompanying drawings, which show some non-limiting exemplary embodiments of the invention, in which:

[0105] Figure 1 is a perspective view of a lid for a container in a closed position;

[0106] Figure 2 yes Figure 1 A side view of the cover in a configuration in which the closure element of the cover is separated from the retaining ring;

[0107] Figure 3 yes Figure 1A three-dimensional and broken-away view of a cap applied on a neck of a container and in a configuration in which a closure element of the cap is moved to a lateral position relative to the neck;

[0108] Figure 4 is a side view of a cover for a container according to an alternative embodiment;

[0109] Figure 5 It is from Figure 4 The observed D direction is similar to Figure 4 's view;

[0110] Figure 6 is with Figure 4 a side view of a similar cover in a configuration in which the closure element of the cover is separated from the retaining ring;

[0111] Figure 7 This is a side view of the neck. Figure 4 A cap can be screwed onto the neck;

[0112] Figure 8 yes Figure 7 A stereogram of the neck;

[0113] Fig. 9 yes Figure 4 The cover is used in Figure 7 A side view on the neck of the cover, wherein the closure element of the cover is arranged in the open position;

[0114] Fig.10 Shown with Fig. 9 Similar magnified details highlight the different properties of the lid;

[0115] Fig.11 is similar to Figure 4 , showing a cover according to an alternative embodiment;

[0116] Fig.12 yes Fig.11 a cross-sectional view of an enlarged detail of the cover;

[0117] Fig.13 is similar to Figure 4 , showing a cover according to another alternative embodiment;

[0118] Fig.14 is similar to Figure 4 , showing a cover according to another alternative embodiment;

[0119] Fig.15 is similar to Figure 4 , showing a cover according to another alternative embodiment;

[0120] Fig.16 is similar to Figure 4, showing a cover according to another alternative embodiment.

[0121] Figure 1 A cap 1 for closing a container, in particular a bottle intended to contain a liquid substance such as a drink, is shown. The cap 1 is made of a polymeric material. Any polymeric material suitable for moulding can be used to obtain the cap 1.

[0122] exist Figure 1 1 shows a cap 1 in a closed position, wherein the cap 1 is in a closed position and is ready to be applied to a container when it leaves a cap production line. In this case, the cap 1 comprises a side wall 2 extending around an axis Z and a transverse wall 3 arranged at one end of the side wall 2 to close the end. The transverse wall 3 extends transversely to (particularly perpendicular 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 a plan view.

[0123] The cover 1 has a separation line 4 located on the side wall 2 and extending around the axis Z. The separation line 4 extends in a plane arranged transversely (in particular perpendicularly) 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 brought to the open position, the closing element 6 is separated from the retaining ring 5 along the separation line 4.

[0124] A plurality of breakable bridges 7 may be provided along the separation line 4, connecting the retaining ring 5 to the closure element 6. The breakable bridges 7 are intended to break when the lid 1 is first moved to the open position, to indicate that the container is no longer intact.

[0125] The separation line 4 may be parallel to the free edge 16 of the cover 1 . More specifically, the free edge 16 delimits the retaining ring 5 on the side opposite to the transverse wall 3 .

[0126] The separation line 4 does not extend over the entire angle of 360° around the axis Z. The separation line 4 is interrupted in the circumferential direction so as to define a joining portion 8 on the side wall 2 , where the closing element 6 remains joined to the retaining ring 5 .

[0127] In other words, the separation line 4 has a first end 9 and a second end 10. The bonding portion 8 is interposed between the first end 9 and the second end 10. At the bonding portion 8, the retaining ring 5 is bonded to the closing element 6.

[0128] like Figure 1 As shown, the joining portion 8 has a dimension angle W around the axis Z.

[0129] No arrow-shaped hinge or area of ​​reduced thickness is provided in the joining portion 8 .

[0130] In the example shown, the closing element 6 has a cup-shaped body and comprises a skirt 11 extending around the axis Z. The skirt 11 is connected to the transverse wall 3 at the end of the skirt 11 opposite the separation line 4. In particular, the skirt 11 is connected to the transverse wall 3 via a connecting area 12 which can be shaped like a beveled edge or a circle in cross section.

[0131] The skirt 11 has removable fixing means (not shown) on its inner surface, by which the closure element 6 can be removably engaged with the neck 18 of the container. The removable fixing means may include, for example, a threaded member intended to engage with an external thread 17 formed on the neck 18 (in the Figure 3 ) engaged with an internal thread.

[0132] The skirt 11 may be provided on its outer surface with a plurality of knurling lines 13 extending parallel to the axis Z and adapted to facilitate the gripping of the cap 1 by a user or the application of the capping machine to the container to be closed.

[0133] The knurling line 13 can also continue in the connecting region 12 and / or in the retaining ring 5 .

[0134] In the example shown, the skirt 11 includes a cylindrical portion 14 on which a knurling line 13 is formed. The skirt 11 also includes a widened portion 15 having a diameter greater than that of the cylindrical portion 14. The widened portion 15 may be defined by a smooth outer surface, i.e., the widened portion may not have a knurling line. However, this condition is not essential, and the knurling line may also extend on the widened portion 15. A step 19 may be provided between the cylindrical portion 14 and the widened portion 15.

[0135] The retaining ring 5 extends between the free edge 16 and the separation line 4. The retaining ring 5 can be defined by an outer surface of cylindrical or frustoconical shape. Figure 1 In the closed position of the cover 1 shown, the retaining ring 5 is coaxial with the closure element 6 .

[0136] The retaining ring 5 is provided with engagement elements 20 on the inner side (at Figure 2 ), the engagement element is adapted to engage with a circular enlarged portion 23 (in Figure 3 The engagement element 20 is configured to abut against the circular enlargement 23 so as to prevent the retaining ring 5 from axially moving away from the neck 18 when the closure element 6 is removed from the neck 18.

[0137] The engagement element 20 may be shaped like an annular element that is bent around the free edge 16 toward the inside of the retaining ring 5. In an alternative embodiment not shown, there may be a plurality of engagement elements that are shaped like tabs that protrude from the free edge 16 and are bent toward the inside of the retaining ring 5. Alternatively, the engagement element 20 may be shaped like an enlargement and be continuous or intermittent, the engagement element protruding from the inner surface of the retaining ring 5 toward the axis Z to engage with the circular enlargement 23.

[0138] like Figure 1 As shown, the cover 1 has a cut line 21 which extends on the side wall 2 transversely, in particular perpendicularly, to the axis Z. In more detail, the cut line 21 is between the separation line 4 and the free edge 16 .

[0139] With the cap 1 positioned in the same orientation as it has been applied to the container, ie with the transverse wall 3 facing upwards, the cut line 21 is arranged below the separation line 4. The cut line 21 is therefore located on the side relative to the separation line 4 where the retaining ring 5 is located.

[0140] The bonding portion 8 is located on the side of the cut line 21 opposite to the retaining ring 5. Therefore, the cut line 21 delimits the bonding portion 8 toward the retaining ring 5.

[0141] The incision line 21 has an extension angle A1 measured around the axis Z, which is greater than the angle of the distance between the first end 9 and the second end 10 of the separation line 4 (i.e., the dimension angle W of the bonding portion 8) (which is also measured around the axis Z). For example, the extension angle A1 of the incision line 21 can be 60° to 200°, preferably 75° to 180°. The dimension angle W of the bonding portion 8 around the axis Z (i.e., the angle of the 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°.

[0142] In the example shown, the joining portion 8 is centered relative to the separation line 21. In other words, the midpoint of the separation line 21 and the center line of the joining portion 8 are aligned with each other in a direction parallel to the axis Z, i.e., the common plane in which the midpoint of the separation line and the center line of the joining portion lie contains the axis Z. However, this condition is not essential, since even an inexactly centered positioning of the cut line 21 relative to the joining portion 8 is permissible.

[0143] In the example shown, the cut line 21 has a flat, arched shape. However, other shapes are possible.

[0144] The incision line 21 and the separation line 4 may be parallel to each other, but this condition is not necessary. For example, the incision line 21 and the separation line 4 may be slightly inclined relative to each other. Alternatively, the incision line 21 may include a plurality of stretches having different inclinations, which are not necessarily parallel to each other.

[0145] like Figure 1 As shown, the cut line 21 has an end 27 and another end 28. The end 27 extends outside the joining portion 8 and exceeds the first end 9 of the separation line 4. The other end 28 also extends outside the joining portion 8 but exceeds the second end 10 of the separation line 4.

[0146] The cut line 21 includes an intermediate portion 24 between the peripheral portion 25 and the other peripheral portion 26. The intermediate portion 24 faces the bonding portion 8. The peripheral portion 25 faces the separation line 4, specifically, faces the end portion of the separation line 4. More precisely, the peripheral portion 25 faces the separation line 4 in the area between the first end 9 and the end 27 of the cut line 21. The other peripheral portion 26 faces the separation line 4, specifically, faces the other end portion of the separation line 4. More precisely, the other peripheral portion 26 faces the separation line 4 in the area between the second end 10 of the separation line 4 and the other end 28 of the cut line 21.

[0147] A connection band 29 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 connecting the bonding portion 8 to the retaining ring 5. Similarly, another connection band 30 is defined between the outer periphery 26 of the cut line 21 and another portion of the separation line 4 starting from the second end 10 for connecting the bonding portion 8 to the retaining ring 5.

[0148] In the example shown, the connecting strip 29 and the further connecting strip 30 are arranged symmetrically to each other with respect to a plane containing the axis Z and the centre line of the joining part 8 .

[0149] The cut line 21 may be formed as a through cut through the entire thickness of the side wall 2. Figures 1 to 3 This feature is not shown in the drawings, but along the cut line 21 there may be one or more breakable elements intended to break when the lid 1 is opened for the first time.

[0150] Alternatively, the cut line 21 may be formed as a weakening line which does not pass through the entire thickness of the side wall 2, but at which the thickness of the side wall 2 is reduced relative to the surrounding area.

[0151] At the first end 9 and the second end 10 of the separation line 4 and / or at the end 27 and the other end 28 of the cut line 21, there may be a cut region 38 (at Figure 1). The cutout region 38 may have a circular geometry and generally have a lateral dimension greater than the width of the corresponding cutout line or the width of the separation line. This may prevent the propagation of a fracture crack starting from the cutout line or the separation line. In an alternative embodiment, the cutout region 38 may not exist.

[0152] In the middle of the joining part 8 there may be a stress-reducing cutout 39, the size of which is very limited relative to the size of the joining part 8, so as not to adversely affect the resistance of the joining part 8. The stress-reducing cutout 39 may increase the deformation capacity of the middle of the joining part 8, thereby reducing stress in the surrounding area. The presence of the stress-reducing cutout 39 is optional.

[0153] exist Figure 1 The cap 1 shown in the closed position is applied on the neck 18 of a container. The cap 1 is positioned so that the engagement element 20 arranged inside the retaining ring 5 is located below the circular enlargement 23 present on the neck 18.

[0154] When the user wants to open the container for the first time, the user grasps the skirt 11 of the closure element 6 and rotates the closure element 6 about the axis Z in order to unscrew the closure element 6 from the neck 18. Initially, the closure element 6 and the retaining ring 5 rotate together about the axis Z, and they simultaneously move together away from the neck 18 in a direction parallel to the axis Z. This happens until the engagement element 20 of the retaining ring 5 abuts against the circular enlargement 23 provided on the neck 18. At this point, the circular enlargement 23 prevents the retaining ring 5 from rising further along the axis Z, acting as a stopper that prevents the retaining ring 5 from moving away from the neck 18.

[0155] The closing element 6 unscrewed by the user continues to move away from the neck 18 along the axis Z. Thus, the breakable bridges 7 are tensioned until they are caused to fail. Thus, the closing element 6 is separated from the retaining ring 5 along the separation line 4, but remains joined to the retaining ring 5 at the joining portion 8.

[0156] When the user continues to unscrew the closure element 6 to move the closure element 6 along the axis Z and remove the closure element from the neck 18, the first connection band 29 and the second connection band 30 are deformed. Specifically, by moving the closure element 6 upward, the first connection band 29 and the second connection band 30 are also pulled upward. Therefore, the first connection band 29 and the second connection band 30 are spaced apart from both the closure element 6 and the retaining ring 5, and the first connection band and the second connection band remain combined with each other in the combination portion 8.

[0157] The first connecting belt 29 and the second connecting belt 30 are thus formed as follows Figure 2The trapezoidal shape shown, the neck 18 of the container is not shown in this figure. In this configuration, the first connecting band 29 remains bonded to the retaining ring 5 at the end 27 of the cut line 21. Similarly, the second connecting band 30 remains bonded to the retaining ring 5 at the other end 28 of the cut line 21.

[0158] The first connection belt 29 and the second connection belt 30 are bonded to each other in the bonding portion 8 .

[0159] In other words, the first connection band 29 and the second connection band 30 are arranged in a configuration inclined relative to the retaining ring 5 , and the first connection band and the second connection band converge in the joining portion 8 .

[0160] Continued unscrewing of the closure element 6 causes it to disengage from the external thread 17 formed on the neck 18, so that the container can be opened. However, the retaining ring 5 remains anchored to the neck 18. The first connecting band 29, the second connecting band 30 and the joint portion 8 define an articulated arrangement 40 (at Figure 3 ), the closure element 6 can be rotated about the hinge arrangement to allow a user to access the contents of the container.

[0161] In particular, after the closure element 6 has been disengaged from the neck 18, by moving the closure element 6 about the hinge arrangement 40, the closure element 6 can be moved to a lateral position relative to the neck 18 such that the closure element 6 is no longer coaxial with the retaining ring 5, as shown in FIG. Figure 3 As shown. The closing element 6 can be relative to Figure 3 The position shown is rotated further rearwardly to move the closure element further away from the neck 18 thereby allowing the user to more easily access the contents of the container.

[0162] After use, the user can return the cover 1 to its original position by a series of operations in the reverse order of the operations described above. Figure 1 Shown in closed position.

[0163] The first 29 and second 30 connecting strips allow obtaining an articulated arrangement 40 that is longer than would be obtainable in the presence of only one articulated strip defined by the joining portion 8. By making it possible to rotate the closure element 6 about the articulated arrangement 40, it is made easier to detach the closure element 6 from the neck 18 and to reapply the closure element 6 on the neck 18.

[0164] Figures 4 to 6 and Fig. 9 A cover 201 according to another embodiment is shown.

[0165] Cover 201 with reference Figures 1 to 3 The same parts as described for cover 1 will be used Figures 1 to 3The reference numerals already used in the description are used and will not be described in detail for the sake of brevity. The foregoing with reference to the cover 1 should be understood to also apply to the cover 201 unless a difference is explicitly stated.

[0166] like Figures 4 to 6 and Fig. 9 As shown, the cover 201 comprises a side wall 2 extending around an axis Z and a transverse wall 3 located at the end of the side wall 2 to close the end.

[0167] The cap 201 is also provided with a separation line 4 on the side wall 2, which defines a retaining ring 5 and a closure element 6 on the cap 201. Since the retaining ring 5 is provided with at least one engagement element on the inside, the retaining ring is intended to remain anchored to the neck of the container to which the cap 201 is applied. In contrast, since the skirt 11 is provided with removable fixing means on the inside, the closure element 6 is adapted to be removably engaged with the neck. Thus, the closure element 6 can be removed in the closed position (e.g. Figure 4 and Figure 5 ) and the open position (as Fig. 9 shown).

[0168] The separation line 4 extends around the axis Z and is interrupted in the circumferential direction to define, on the side wall 2 , a joining portion 8 , via which the closing element 6 is joined to the retaining ring 5 .

[0169] Furthermore, a cut line 21 is provided on the side wall 2. In the example shown, the cut line 21 is axially interposed between the separation line 4 and the free edge 16 of the retaining ring 5.

[0170] The cut line 21 includes a peripheral portion 25, another peripheral portion 26, and an intermediate portion 24 between the peripheral portion 25 and the another peripheral portion 26. The cut line 21 is completely located in a plane transverse to (specifically, perpendicular to) the axis Z. In other words, the peripheral portion 25, the intermediate portion 24, and the another peripheral portion 26 are located in the same plane arranged transverse to (specifically, perpendicular to) the axis Z.

[0171] Two connection bands are defined between the separation line 4 and the cut line 21 , namely a connection band 29 and a further connection band 30 , which connect the retaining ring 5 to the connection portion 8 .

[0172] Specifically, the connection band 29 extends between the outer periphery 25 of the cut line 21 and the portion of the separation line 4 starting from the first end 9 of the separation line. Similarly, another connection band 30 extends between another outer periphery 26 of the cut line 21 and another portion of the separation line 4 starting from the second end 10.

[0173] The connection band 29 and the further connection band 30 may be arranged symmetrically to each other with respect to a plane containing the axis Z and the center line of the coupling portion 8 .

[0174] Figure 7 and Figure 8 A neck 218 is shown to which the cap 201 can be applied. The neck 218 extends around a longitudinal axis Z1. When the cap 201 is applied on the neck 218 and the closing element 6 is in the closed position, the axis Z of the side wall 2 coincides with the longitudinal axis Z1.

[0175] The neck 218 is delimited by an outer surface 219 which, in the example shown, is cylindrical and coaxial with the longitudinal axis Z1 .

[0176] The outer surface 219 extends to a rim 220 of the neck 218. The rim 220 surrounds an opening 221 through which the container can be accessed when the closure element 6 is in the open position. Conversely, the closure element 6 closes the opening 221 when it is arranged in the closed position.

[0177] The neck 218 comprises a flange 222 which is adapted to prevent the retaining ring 5 from dropping below a predetermined level along the neck 218. Furthermore, the flange 222 can be used for transporting the container during production, filling and capping.

[0178] The outer surface 219 extends from the flange 222 to the rim 220 .

[0179] A circular enlarged portion 223 protrudes from the outer surface 219 , and the circular enlarged portion 223 is adapted to engage with an engagement element disposed inside the retaining ring 5 to prevent the retaining ring 5 from being separated from the neck 218 .

[0180] The circular enlargement 223 may include a frustoconical portion 224 having a diameter that increases in a direction from the rim 220 toward the flange 222 .

[0181] The circular enlargement 223 is delimited on the side opposite to the rim 220 by an abutment surface 225 against which at least one engagement element of the retaining ring 5 abuts.

[0182] The cylindrical portion of the circular enlargement 223 may be interposed between the frustoconical portion 224 and the abutment surface 225 .

[0183] However, other geometries of the circular enlargement 223 are also possible.

[0184] The neck 218 comprises at least one removable fixing element with which a removable fixing means formed inside the closing element 6 can engage to allow the closing element 6 to be alternatively applied on or removed from the neck 218 .

[0185] The at least one removable fixation element may include external threads 217 formed on (particularly protruding from) an outer surface 219 .

[0186] When the closing element 6 is in the closed position, the cap 201 is intended to be applied on the neck 218. Specifically, the cap 201 is applied on the neck 218 so that at least one engagement element arranged inside the retaining ring 5 is located below the circular enlargement 223, specifically, in a position between the flange 222 and the circular enlargement 223.

[0187] When the user acts on the cap 201 for the first time to move the closure element 6 to the open position, the closure element 6 is unscrewed, that is, the closure element rotates around the longitudinal axis Z1 and moves away from the flange 222 at the same time. The retaining ring 5 engaged to the closure element 6 by the breakable bridge 7 initially moves with the closure element 6. When at least one engaging element disposed inside the retaining ring 5 abuts against the abutment surface 225, the retaining ring 5 can no longer rise along the neck 218. On the other hand, as the user gradually continues to unscrew the closure element 6, the closure element 6 moves further away from the body of the container while rotating around the longitudinal axis Z1. Thus, the breakable bridge 7 arranged along the separation line 4 is subjected to stresses that cause them to break. The connecting bands 29, 30 are also deformed while the closure element 6 is unscrewed. Specifically, as the closure element 6 gradually moves away from the retaining ring 5 during unscrewing, the connecting bands 29, 30 are located in a position inclined relative to the retaining ring 5, so that the connecting band is separated from the retaining ring 5 along the incision line 21. The closure element 6 is also separated from the connecting bands 29, 30. All breakable elements located along the cut line 21 are broken.

[0188] Thus, the closing element achieves Figure 6 , the neck is not shown in this figure. Figure 6 The position shown can be defined as the disengaged position because Figure 6 In the position shown, the removable fixing means formed on the inside of the closing element 6 have been disengaged from the thread 217 of the neck 218 .

[0189] At this time, the closing element 6 can be rotated relative to the retaining ring 5 to move the closing element to Fig. 9 In the open position shown, the closure element 6 is arranged on one side of the neck 218 and the axis Z of the closure element 6 no longer coincides with the longitudinal axis Z1 of the neck 218 .

[0190] The connecting strips 29 , 30 are deformable so that both the closing element 6 and the coupling portion 8 can rotate relative to the neck 218 .

[0191] like Figure 6As more clearly shown in FIG. 1 , the engaging portion 8 is delimited by an edge 50 which, when the closing element 6 is in the closed position (and generally before the closing element 6 is rotated relative to the retaining ring 5 to move to the open position), faces the retaining ring 5. More specifically, the edge 50 defined on the side wall 2 faces the closing element 6 through the cut line 21.

[0192] When the closing element 6 is moved from the disengaged position to the open position, the engaging portion 8 is turned over relative to the neck 218. Thus, the edge 50 facing the retaining ring 5 in the disengaged position (and also in the closed position) is positioned so that it faces the rim 220 of the neck 218, i.e., it is located at the neck 218. Fig. 9 upward in the case of operation.

[0193] To make this possible, the engaging portion 8 (and in particular, the edge 50 of the engaging portion) slides along the truncated cone portion 224 of the circular enlargement 223 and at the same time the edge rotates relative to the connecting strips 29, 30. Assuming that the neck 218 is positioned so that the opening 221 faces upwards, the edge 50 reaches a height higher than the circular enlargement 223. The engaging portion 8 is thus at least partially positioned above the circular enlargement 223 and thus on the neck 218. In particular, the engaging portion 8 is located on the outer surface 219 above the circular enlargement 223.

[0194] As a result, interference is generated between the neck 218 and the coupling portion 8 (specifically, along the edge 50 and near the edge). Interference may also exist between the connecting strips 29, 30 and the neck 218. This allows the closure element 6 to be stably maintained in the open position. In fact, in order to return the closure element 6 to the closed position, the interference between the coupling portion 8 and the neck 218 must be overcome. Usually, this does not happen accidentally, but only occurs when the user intentionally applies sufficient force to the closure element 6, that is, when the user wishes to move the closure element 6 to the closed position.

[0195] Furthermore, the interference that occurs between the coupling portion 8 and the neck 218 makes it difficult for the cap 201 to rotate around the neck 218 due to the rotation of the retaining ring 5 around the neck 218. In fact, the retaining ring 5 is connected to the coupling portion 8 by the connecting bands 29, 30. Therefore, the retaining ring 5 cannot rotate freely around the neck 218, but can rotate only when the interference between the coupling portion 8 and the neck 218 is overcome.

[0196] In order to enable the coupling part 8 to rotate when the closure element 6 moves from the disengaged position to the open position, the connecting strips 29, 30 are subjected to a twist, which affects at least a portion of the height H of each of the connecting strips 29, 30. The term "height H" of the connecting strips 29, 30 refers to the height H of the connecting strips 29, 30 when the closure element 6 is in the disengaged position. Figure 4In the closed position shown, the dimensions of the connecting strips 29 , 30 are in a direction parallel to the axis Z of the side wall 2 .

[0197] In the example shown, in which the separation line 4 and the cut line 21 lie in respective planes parallel to one another, the height H of the connecting strips 29 , 30 is constant along the entire length of the connecting strips 29 , 30 and the heights of the two connecting strips 29 , 30 are equal.

[0198] like Figures 4 to 6 and Fig. 9 As shown, a knurling line 13 is provided on the closure element 6. The knurling line 13 can extend parallel to the axis Z.

[0199] In the example shown, the separation line 4 intersects the knurling line 13. In other words, the knurling line 13 extends on both sides of the separation line 4, ie the knurling line extends above and below the separation line 4.

[0200] This is because the separation line 4 is arranged in a position as close as possible to the removable fixing means arranged inside the closing element 6, ie as close as possible to the internal thread. Thereby, the height H of the connecting strips 29, 30 can be increased.

[0201] Therefore, if Fig. 9 As shown, the connecting strips 29, 30 include a first portion 51 adjacent to the separation line 4 and a second portion 52 adjacent to the incision line 21, wherein the first portion is provided with a knurling line 13 in the example shown and the second portion is smooth in the example shown. A widening portion 53 may be provided between the first portion 51 and the second portion 52.

[0202] In the example shown, when the joining portion 8 is rotated so that the edge 50 faces the rim 220, the second portion 52 of the connecting strips 29, 30 twists and passes under the first portion 51. In contrast, the first portion 51 radially expands but does not undergo much twisting, as does the widening 53, if present.

[0203] Due to the deformation of the connecting strips 29, 30, the joining portion 8 can be located on the neck 218 with the edge 50 facing the rim 220, without having to provide weakening or breaking lines in the joining portion 8 and / or in the connecting strips 29, 30. Thus, the production of the cap 201 is not complicated.

[0204] Although in the closed position, there is a small amount of play between the coupling portion 8 and the neck 218 when the edge 50 faces the retaining ring 5. When the closure element 6 is moved to the open position, the coupling portion 8 begins to rotate and begins to interfere with the neck 218. The interference between the coupling portion 8 and the neck 218 reaches a maximum when the coupling portion 8 is arranged approximately in a plane perpendicular or almost perpendicular to the neck 218 (or more precisely the longitudinal axis Z1 of the neck). When the coupling portion 8 is turned over, that is, when the edge 50 is moved above the connecting strips 29, 30, the interference between the coupling portion 8 and the neck 218 decreases. In the open position, the interference between the coupling portion 8 and the neck 218 still remains, although it is less than the maximum.

[0205] When the closure element 6 is manually rotated to pass the position where the interference reaches a maximum value, the user who moves the closure element to the open position feels a certain vibration. This vibration is perceived by the hand of the user who moves the closure element 6 as a discontinuity in the movement of the closure element 6. In other words, the closure element 6 is snapped into place beyond the position where the interference between the coupling portion 8 and the neck 218 reaches a maximum value, and the user senses this snapping movement.

[0206] Thereby, the user is sure that the closure element 6 has been correctly moved to the open position.

[0207] The vibration may also be accompanied by a sound such as a "click" that can be heard by the user, but it does not have to be.

[0208] The cover 201 not only ensures that the closure element 6 is stably maintained in the open position, but also that in the open position, the closure element 6 is rotated backward relative to the neck by a relatively large opening angle A2, such as Fig. 9 shown.

[0209] Specifically, the angle A2 may be greater than or equal to 140°. This makes it difficult for the closure element 6 to hit the face of a user who is drinking directly from a bottle to which the cap 201 is applied in an unwelcome manner, or to prevent the closure element 6 from interfering with the dispensing of the liquid contained in the bottle into a container (e.g., a glass).

[0210] Experiments have shown that several geometric parameters of the cap 201 and / or the neck 218 are advantageous for the previously referenced Fig. 9 Describe the performance.

[0211] Specifically, the outer diameter or maximum diameter Dmax (at Figure 7223). It is also possible to define a diameter Ds of the outer surface 219 of the neck 218 immediately above the circular enlarged portion 223 (i.e., in a position between the circular enlarged portion 223 and the external thread 217). In the example shown, the diameter Ds immediately above the circular enlarged portion 223 coincides with the diameter of the outer surface 219 in the region between the external thread 217 and the rim 220, but this condition is not required.

[0212] Delta represents the difference between the outer diameter Dmax of the circular enlarged portion 223 and the diameter Ds of the outer surface 219 immediately above the circular enlarged portion 223 .

[0213] In the example shown, the outer diameter Dmax of the circular enlarged portion 223 is 30.2 mm.

[0214] The diameter Ds of the outer surface 219 immediately above the circular enlarged portion 223 is 28 mm.

[0215] The difference Delta between Dmax and Ds is 30.2-28=2.2 mm.

[0216] Half of the difference Delta represents the distance that the circular enlarged portion 223 protrudes relative to the outer surface 219 .

[0217] As mentioned, H denotes the height of the connecting strips 29 , 30 , ie the distance between the separation line 4 and the incision line 21 measured in a direction parallel to the axis Z when the closing element 6 is in the closed position.

[0218] In the example shown, the height H is 2.8 mm.

[0219] Therefore, the ratio R1 between the height H and half of the difference Delta is 2.8 / 1.1, ie, 2.55.

[0220] It is desirable that the ratio R1 between the height H and half the difference Delta, which are defined above, is greater than or equal to 1.5. Preferably, the above ratio R1 is greater than or equal to 2. Even more preferably, R1 is greater than or equal to 2.5.

[0221] This ensures that the height H of the connecting strips 29 , 30 is in the correct proportion to the distance that the circular enlargement 223 protrudes from the outer surface 219 .

[0222] More specifically, if the ratio R1 is less than 1.5, it may happen that the interference generated between the coupling portion 8 and the neck 218 is insufficient to stably lock the closing element 6 in the open position, in which the opening angle A2 is greater than or equal to 120°, preferably, greater than or equal to 140°.

[0223] In some cases, a value of the ratio R1 less than 1.5 is acceptable, but not less than 0.8.

[0224] In the example shown, half of the difference Delta between the outer diameter Dmax of the circular enlarged portion 223 and the diameter Ds of the outer surface 219 of the neck 218 immediately above the circular enlarged portion 223 is Delta / 2=1.1 mm.

[0225] Even with values ​​of the difference Delta different from those described above, a properly functioning cover 201 can be obtained. In general, experiments have shown that relatively small values ​​of the difference Delta (and therefore relatively small values ​​of Delta / 2) help to obtain Fig. 9 Performance of the type shown.

[0226] The joining portion 8 has a dimension angle W around the axis Z of the side wall, which is already Figure 1 201 and can be defined in the same manner with reference to cover 201.

[0227] In the example shown, the dimension angle W of the joining portion 8 is 54°.

[0228] Generally, the dimension angle W may be greater than or equal to 20°, preferably, greater than or equal to 25°.

[0229] Furthermore, the dimension angle W may be less than or equal to 120°, preferably, less than or equal to 90°.

[0230] In one embodiment, the dimension angle W may be 80° to 120°.

[0231] In one embodiment, the dimension angle W of the bonding portion 9 may range from 30° to 110°. For example, the dimension angle may be 60°.

[0232] Experiments have shown that if the dimension angle W is greater than 120°, the connecting strips 29 , 30 may break when the closing element 6 is rotated to move to the open position.

[0233] On the contrary, if W is less than 20°, it may happen that the engaging portion 8 cannot successfully hold the closing element 6 stably in the open position in which the opening angle A2 is greater than or equal to 120°, preferably, greater than or equal to 140°.

[0234] like Figure 7 As shown, a distance Y can also be defined between the circular expansion 223 and at least one removable fixing element disposed on the neck 219. In other words, the distance Y is measured between the upper boundary of the circular expansion 223 and the start point of the external thread 217.

[0235] The distance Y may be greater than or equal to half the distance between the separation line 4 and the cut line 21 , ie, greater than or equal to half the height H. However, this condition is not essential.

[0236] like Figure 7 As shown, an angle A formed between a generatrix of the frustoconical portion 224 and a straight line parallel to the longitudinal axis Z1 may be defined.

[0237] In the example shown, angle A is 30°.

[0238] More generally, angle A is preferably less than or equal to 35°.

[0239] This reduces the risk that the coupling portion 8 cannot slide properly on the circular enlarged portion 223 (specifically, in the vicinity of the outer diameter Dmax) to then stably stop in contact with the neck 218 .

[0240] When the user wishes to reclose the container, the closure element 6 can be returned to the closed position by the operation sequence opposite to the aforementioned operation sequence. Specifically, the user rotates the closure element 6 relative to the neck 218 to return the closure element to the closed position. Therefore, the coupling portion 8 is also rotated, so that the edge 50 below the connecting band 29, 30 is returned to the position facing the retaining ring 5. When the edge 50 is disengaged from the neck 218, the user perceives vibration or snap-fit ​​motion feedback, which may (but not necessarily) be accompanied by a "click" sound. Thus, the user realizes that the closure element 6 is ready to be screwed onto the neck 218 again. In fact, the closure element 6 can be screwed onto the neck 218 again from the disengagement position after having arrived at the disengagement position to move the closure element to the closed position.

[0241] exist Fig. 9 In the example of , in the open position, the edge 50 is located in a plane substantially perpendicular to the longitudinal axis Z1 of the neck 218, ie in a horizontal plane. However, this condition is not essential.

[0242] like Fig.10 As shown, in the open position, the edge 50 may also lie on a plane inclined toward the outer surface 219 on the side of the rim 22 of the neck 218 .

[0243] In the open position, the edge 50 may also be in a similar manner to Fig.10 structure, but not flat.

[0244] Also in Fig.10 In the case shown, the performance of the cover is similar to that of the reference above Figures 4 to 6 and Fig. 9 Therefore, reference Figures 4 to 6 and Fig. 9The content described is also considered applicable to Fig.10 .

[0245] References so far Figures 4 to 6 and Fig. 9 In the example described, the separation line 4 is situated in the portion of the side wall 2 where the knurling line 13 is present.

[0246] However, this condition is not essential. In an alternative embodiment (not shown), the separation line 4 can be formed in a portion of the side wall 2, wherein the portion is externally bounded by a substantially smooth outer surface. That is, the separation line 4 can be located in a portion of the side wall 2 without the knurling line 13 (e.g. between the knurling line 13 and the free edge 16). Therefore, in the alternative embodiment just described, the connecting strips 29, 30 are externally bounded by a smooth surface (i.e. a surface without the knurling line).

[0247] Examples of this type of cover are Fig.11 shown.

[0248] Fig.11 A cover 301 is shown in which the side wall 2 has a plurality of knurling lines 13 on its outer surface.

[0249] exist Fig.11 In the example of , the separation line 4 is arranged in a portion of the side wall 2 without the knurling line 13, i.e., in a smooth portion of the side wall 2. This is because the knurling line 13 has respective lower ends that are spaced apart from the separation line 4 (i.e., these ends are closer to the free edge 16). The separation line 4 is therefore arranged in a portion of the side wall 2 without knurling.

[0250] exist Fig.11 In the example of FIG. 4 , breakable bridges 7 can be seen arranged along the separation line 4 . Some breakable elements 70 arranged along the incision line 21 can also be seen. The breakable elements 70 can be similar to the breakable bridges 7 .

[0251] In the example shown, the breakable elements 70 are offset relative to the breakable bridges 7 in a direction parallel to the axis Z of the cover 301. In other words, a plane containing the axis Z and passing through the breakable bridges 7 does not intersect any breakable element 70.

[0252] In other words, the breakable element 70 is arranged in a position which is angularly offset about the axis Z relative to the breakable bridge 7 .

[0253] The width of each breakable bridge 7 and of each breakable element 70 , measured in the circumferential direction along the separation line 4 and along the incision line 21 , respectively, may be equal to 0.4 mm.

[0254] Fig.11 The performance of the lid 301 shown in FIG. 1 is similar to that during opening and closing. Figures 4 to 6 and Fig. 9 The performance of the cover 201 shown in FIG. More specifically, similar to Fig. 9 and Fig.10 In the cover 201 shown in FIG. 301 , when the closing element 6 of the cover 301 is moved from the closed position to the open position, the connecting strips 29 , 30 are deformed with the twisting movement, which may affect a portion of the height of these connecting strips. Fig.11 In the example of FIG. 4 , the first portion 51 adjacent to the separation line 4 and the second portion 52 adjacent to the cut line 21 are both smooth, ie, without knurling lines.

[0255] Fig.11 The connecting bands 29, 30 shown in the figure can be deformed so that the first portion 51 is radially expanded without undergoing a large amount of twisting. On the other hand, the second portion 52 can be twisted through the bottom of the first portion 51, so as to be interposed between the first portion 51 and the outer surface 219 of the neck 218. As a result, the edge 50 can pass over the circular expansion 223 and be positioned at a higher height than the circular expansion, that is, the edge is closer to the edge 220 than the circular expansion 223.

[0256] This allows the coupling portion 8 to rotate relative to the connecting strips 29 , 30 so as to pass over (ie, at a higher height than) the circular enlargement 223 and to lie on the outer surface 219 .

[0257] like Fig.11 As shown, the separation line 4 is located at a distance D1 from the free edge 16 of the retaining ring 5 .

[0258] The distance D1 is less than or equal to 6.5 mm. Preferably, the distance D1 is less than or equal to 5 mm.

[0259] The distance D1 is greater than or equal to 2 mm. Preferably, the distance D1 is greater than or equal to 3 mm.

[0260] In a preferred embodiment, the distance D1 is therefore 3 mm to 5 mm.

[0261] The separation line 4 may have an extension angle around the axis Z which is greater than or equal to 250°. The extension angle of the separation line 4 may be less than or equal to 330°.

[0262] In an embodiment, the extension angle of the separation line 4 may be 250° to 280°.

[0263] The cut line 21 is located at a distance D2 from the free edge 16 of the retaining ring 5 .

[0264] The distance D2 may be greater than or equal to 1 mm.

[0265] The distance D2 may be less than or equal to 5 mm. More specifically, the distance D2 may be less than or equal to 4 mm.

[0266] In an embodiment, the distance D2 may be 1 mm to 3 mm.

[0267] In an embodiment, distance D2 may be equal to 3.9 mm.

[0268] The incision line 21 may have an extension angle around the axis Z that is greater than or equal to 120°. The extension angle may be less than or equal to 250°.

[0269] In an embodiment, the cut line 21 may have an extension angle greater than or equal to 130°.

[0270] The extension angle of the incision line 21 may be less than or equal to 200°.

[0271] The extension angle of the incision line 21 may be equal to 160°, for example.

[0272] In an embodiment, the extension angle of the cut line 21 may be 180° to 250°.

[0273] The height H of the connection bands 29 , 30 may be greater than or equal to 1 mm and less than or equal to 5.5 mm.

[0274] The height H is measured in a direction parallel to the axis Z with the cover 1 in the closed position.

[0275] More specifically, the height H of the connection bands 29 , 30 may be greater than or equal to 1.2 mm and less than or equal to 4 mm.

[0276] In an embodiment, the height H ranges from 1.2 mm to 3.5 mm.

[0277] The height H may be equal to 2 mm.

[0278] In an embodiment, a height H1 of the cover 301 measured in a direction parallel to the axis Z may be 10 mm to 21 mm.

[0279] like Fig.12 As shown, the radial thickness S (ie the thickness measured in the radial direction relative to the axis Z) of each connecting band 29, 30 may be greater than or equal to 0.35 mm. The thickness may be less than or equal to 1.8 mm.

[0280] In an embodiment, the radial thickness S of each connecting band 29, 30 may be greater than or equal to 0.5 mm. The thickness may be less than or equal to 1.2 mm.

[0281] The radial thickness S of the connecting bands 29, 30 may be constant in a direction parallel to the axis Z. Alternatively, the radial thickness S of the connecting bands 29, 30 may vary in a direction parallel to the axis Z. More specifically, the radial thickness S of the connecting bands 29, 30 may vary along a direction parallel to the axis Z in a manner maintained within the above range.

[0282] In the exemplary embodiment, a relatively large radial thickness S of the connecting strips 29 , 30 corresponds to a relatively small height H, and vice versa.

[0283] For example, if the radial thickness S is in the upper half of the range of 0.35 mm - 1.8 mm (ie, in the range of 1.1 mm - 1.8 mm), the height H may be in the lower half of the range of 1 mm - 5.5 mm (ie, in the range of 1 mm - 3.2 mm).

[0284] The opposite also applies, ie if the radial thickness S varies in the range of 0.35 mm-1.1 mm, the height H can vary in the range of 3.2 mm-5.5 mm. However, a relatively large radial thickness S of the connecting strips 29 , 30 can also be combined with a relatively large height H.

[0285] The following are Fig.11 Some examples of the dimensions a cover of the type shown in FIG. 1 may have.

[0286] Type of cap / neck S[mm] H[mm] H / S 29 / 25mm 0.7 1.2 1.71 29 / 25mm 0.7 2.3 3.29 PCO 1881 0.75 3.5 4.67 30 / 25mm 0.65 2.7 4.15 30 / 25mm 0.45 2.45 5.44 38mm 3 threads 0.7 3.1 4.43 29 / 25mm 0.85 1.2 1.4 30 / 25mm 0.55 2.8 5.1

[0287] Experiments have shown that these covers remain stably open through an opening angle A2 of at least 120°.

[0288] The ratio between the height H of the connection band (ie, the distance between the separation line 4 and the incision line 21 ) and the radial thickness S of the connection band may be greater than or equal to 1.4.

[0289] The above ratio may be less than or equal to 5.1.

[0290] More generally, the ratio between the height H of the connection band and the radial thickness R of the connection band may be less than or equal to 6.5.

[0291] These values ​​ensure that the connecting strips 29, 30 have optimal torsional rigidity to deform as described above and to create an interference between the neck and the joining portion 8 (and possibly between the neck and the connecting strips 29, 30) sufficient to hold the closing element 6 in the open position in a reliable and secure manner.

[0292] References Fig.11 The values ​​defined for the cover 301 shown in FIG. 301 may also be applied to Figures 4 to 6 , Fig. 9 and Fig.10The cover 201 is shown in FIG.

[0293] The cover 201 or the cover 301 is also particularly easy to manufacture.

[0294] In practice, the cap 201 or the cap 301 can be obtained starting from a concave body comprising the side walls 2 and the transverse walls 3. The concave body is produced by moulding of a polymeric material, for example compression moulding or injection moulding.

[0295] After the concave body is manufactured, the separation line 4 and the cut line 21 are formed on the side wall 2 .

[0296] The separation line 4 and the incision line 21 can be formed by a cutting operation, for example, carried out in a cutting unit located downstream of the mold in which the concave body is formed. This cutting operation can be carried out by corresponding blades, for example circular blades or linear blades, which interact with the side wall 2 from the outside or from the inside. In particular, the concave body can be rotated around the axis Z of the side wall 2 while the blade is held in place, so that successive areas of the side wall 2 interact with the blade in succession. It is also possible to hold the concave body in place and rotate the blade for cutting.

[0297] As in the example currently shown, the separation line 4 and the incision line 21 are both located in corresponding parallel planes, in which case the blade allowing the separation line 4 to be obtained and the blade for obtaining the incision line 21 can be configured to interact with the side wall 2 in corresponding parallel planes, for example perpendicular to the axis Z.

[0298] The blade may have an interrupted cutting edge if there are breakable bridges 7 along the separation line 4 to maintain definition and / or if there are corresponding breakable elements along the incision line 21 to maintain definition.

[0299] The cut line 21 may be made by using a blade having a flat cutting edge so that the cut line 21 lies in one plane over the entire length of the cut line 21 .

[0300] It is also possible that the blade does not cut through the entire thickness of the side wall 2 but only partially so as to leave a film along the cut line 21 and / or along the separation line 4 which is intended to break when the lid is opened for the first time.

[0301] The separation line 4 and the cut line 21 may be formed simultaneously, or may be formed in two separate steps.

[0302] Since the concave body can be formed in a common mould, the cap 201 or cap 301 is particularly easy to produce.No undercuts or thin parts are required, other than those with which caps of known type are usually provided.

[0303] The additional operation, namely, forming the cut line 21 , can be performed very simply while obtaining the separation line 4 .

[0304] The geometry of the incision line can differ from the geometry shown so far.

[0305] For example, Fig.13 A cover 401 is shown according to an alternative embodiment. Fig.11 The cover shown in FIG. 1 is different because it includes a cut line 421 that does not lie in a single plane but is defined by two curved stretches 421a and 421b that lie in respective planes and converge on a common line. That is, the curved stretches 421a, 421b converge at a point P, at Fig.13 In the example of , this point is higher than the remaining extension of the curved stretches 421a, 421b.

[0306] on the other hand, Fig.15 The example of WO 2011 / 03684 shows a cover 601 whose cut line 621 is defined by two curved stretches 621a, 621b converging at a point P1 which is lower than the remaining extension of the curved stretches 621a, 621b.

[0307] On the other hand, Fig.14 In the example of , a cover 501 is provided having a cut line 521 which is not flat but has a curved tendency with a concavity facing downwards, ie towards the free edge 16 of the retaining ring 5, on the side wall of the cover.

[0308] at last, Fig.16 The cover 701 is shown with the curved shape of the cut line 721 having a concavity facing upwards, ie towards the closure element 6 .

[0309] The cover is made of plastic (eg, polypropylene (PP) or polyethylene (PE)).

[0310] If PE is used, the density of the cap may range from low density to high density. More specifically, high density polyethylene (HDPE) may be used.

[0311] The high-density polyethylene (HDPE) used to produce the above-mentioned caps has the following characteristics:

[0312] -Density can be 950kg / m 3 and 968kg / m 3 Changes between

[0313] - Under the measurement conditions of 10 minutes, 190°C, and 2.16 kg, the melt index can vary from 0.3 g to 20 g;

[0314] - The molecular weight distribution can be large, narrow, unimodal or multimodal.

[0315] If PP is used, the material may be in the form of a homopolymer, a heterophasic copolymer, or a statistical copolymer.

[0316] Under the measurement conditions of 10 minutes, 230°C, and 2.16 kg, the melt index of PP can change from 2g to 20g.

Claims

1. A cover for a container, comprising a side wall (2) extending around an axis (Z) and a transverse wall (3) arranged at the end of the side wall (2), a separation line (4) being provided on the side wall (2) for defining: - a retaining ring (5) intended to remain anchored to the neck (218) of the container; and - a closure element (6) removably engageable with the neck (218) in order to open or close the container; in, The separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), in which no arrow-shaped hinge or thickness reduction area is provided, and the cover also has a cut line (21) extending transversely to the axis (Z) between the separation line (4) and the free edge (16) of the retaining ring (5), so that two connecting strips are defined between the separation line (4) and the cut line (21). (29, 30), the connecting band (29, 30) connects the retaining ring (5) to the connecting portion (8), the connecting band (29, 30) has a radial thickness (S) measured in the radial direction, the connecting band (29, 30) also has a height (H) measured parallel to the axis (Z), and wherein the ratio between the height (H) of the connecting band (29, 30) and the radial thickness (S) is greater than or equal to 1.4, and the ratio is less than or equal to 6.

5.

2. The cover according to claim 1, wherein The height (H) of the connecting bands (29, 30) is greater than or equal to 1 mm and less than or equal to 5.5 mm.

3. The cover according to claim 1, wherein The radial thickness (S) of the connecting band (29, 30) is greater than or equal to 0.35 mm and less than or equal to 1.8 mm.

4. The cover according to claim 1, wherein The radial thickness (S) is greater than or equal to 1.1 mm and less than or equal to 1.8 mm, and the height (H) is greater than or equal to 1 mm and less than or equal to 3.2 mm.

5. The cover according to claim 1, wherein The radial thickness (S) is greater than or equal to 0.35 mm and less than or equal to 1.1 mm, and the height (H) is greater than or equal to 3.2 mm and less than or equal to 5.5 mm.

6. The cover according to claim 1, wherein The separation line (4) and the incision line (21) are cutting lines.

7. The cover according to claim 1, wherein A plurality of breakable bridges (7) are arranged along the separation line (4) and a plurality of breakable elements (70) are arranged along the cut line (21), the breakable bridges (7) and the breakable elements (70) being intended to break when the lid is opened for the first time.

8. The cover according to claim 7, wherein: The breakable element (70) is arranged in a position angularly offset about the axis (Z) relative to the breakable bridge (7).

9. The cover according to claim 1, wherein: When the closing element (6) is in the closed position, the cut line (21) lies in a plane arranged perpendicularly to the axis (Z).

10. A cover for a container, comprising a side wall (2) extending around an axis (Z) and a transverse wall (3) arranged at the end of the side wall (2), a separation line (4) being provided on the side wall (2) for defining: - a retaining ring (5) intended to remain anchored to the neck (218) of the container; and - a closure element (6) removably engageable with the neck (218) in order to open or close the container; in, The separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), in which no arrow-shaped hinge or area of ​​reduced thickness is provided, the cover also having a cut line (21) extending transversely to the axis (Z) between the separation line (4) and the free edge (16) of the retaining ring (5), so that two connecting strips (29, 30) are defined between the separation line (4) and the cut line (21), the connecting strips (29, 30) connecting the retaining ring (5) to the joint portion (8), The separation line (4) and the incision line (21) are cutting lines, wherein a plurality of breakable bridges (7) are arranged along the separation line (4), and a plurality of breakable elements (70) are arranged along the incision line (21), and the breakable bridges (7) and the breakable elements (70) are intended to break when the lid is opened for the first time, wherein the incision line (21) includes an outer peripheral portion (25), another outer peripheral portion (26) and an intermediate portion (24) between the outer peripheral portion (25) and the another outer peripheral portion (26), and wherein the incision line (21) is located in a plane arranged perpendicular to the axis (Z).

11. The cover according to claim 10, wherein The coupling portion (8) has a dimension angle (W) measured around the axis (Z) that is greater than or equal to 30° and less than or equal to 110°.

12. The cover according to claim 10, wherein The incision line (21) has an extension angle (A1) measured around the axis (Z) that is greater than or equal to 120° and less than or equal to 250°.

13. The cover according to claim 10, wherein: The separation line (4) is located at a distance (D1) from the free edge (16) of the retaining ring (5) that is greater than or equal to 2 mm and less than or equal to 6.5 mm.

14. The cover according to claim 10, wherein: The cut line (21) is located at a distance (D2) from the free edge (16) of the retaining ring (5), the distance being greater than or equal to 1 mm and less than or equal to 5 mm.

15. A combined structure of a lid for a container and a neck (218) of the container, wherein: The neck (218) is delimited by an outer surface (219) from which a circular enlargement (223) projects, the outer surface (219) extending upwards to a rim (220) of the neck (218), the rim (220) facing upwards in the operating state, and wherein the cover comprises a side wall (2) extending around an axis (Z), on which a separation line (4) is provided for defining: - a retaining ring (5) intended to engage with said circular enlargement (223) so as to remain anchored to said neck (218), and a closure element (6) removably engageable with the neck (218) so as to be movable between a closed position and an open position, The separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), wherein no arrow-shaped hinge or thickness reduction area is provided in the joint portion, and the cover also has a cut line (21) extending transversely to the axis (Z) between the separation line (4) and the free edge (16) of the retaining ring (5), so that two connecting strips (29, 30) are defined between the separation line (4) and the cut line (21), the connecting strips (29, 30) connecting the retaining ring (5) to the joint portion (8), the connecting strips (29, 30) can be deformed by torsional movement, and the torsional movement affects at least a portion of the height (H) of each connecting band (29, 30), so that when the closing element (6) moves from the closed position to the open position, the connecting portion (8) rotates relative to the connecting band (29, 30), and the edge (50) of the connecting portion (8) facing the retaining ring (5) in the closed position becomes at least partially located above the circular expansion portion (223), thereby generating interference between the connecting portion (8) and the neck (218) to keep the closing element (6) in the open position.

16. The combined structure according to claim 15, wherein: In the open position, there is also interference between the connecting straps (29, 30) and the neck (218).

17. The combined structure according to claim 15, wherein: Each of the connecting strips (29, 30) comprises a first portion (51) adjacent to the separation line (4) and a second portion (52) adjacent to the incision line (21), wherein when the closure element (6) moves from the closed position to the open position, the first portion (51) is configured to expand radially so that the second portion (52) twists and passes under the first portion (51).

18. The combined structure according to claim 15, wherein: The cover is a cover according to claim 1.

19. A combined structure of a lid for a container and a neck (218) of the container, wherein: The neck (218) is delimited by an outer surface (219) from which a circular enlargement (223) projects, the outer surface (219) extending upwardly to a rim (220) of the neck (218), and wherein the cap comprises a side wall (2) extending around an axis (Z), on which a separation line (4) is provided for defining: - a retaining ring (5) intended to engage with said circular enlargement (223) so as to remain anchored to said neck (218), and a closure element (6) removably engageable with the neck (218) so as to be movable between a closed position and an open position, The separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), wherein no arrow-shaped hinge or thickness reduction area is provided in the joint portion, and the cover also has a cut line (21) extending transversely to the axis (Z) between the separation line (4) and the free edge (16) of the retaining ring (5), so that two connecting strips (29, 30) are defined between the separation line (4) and the cut line (21), and the connecting strips (29 , 30) combines the retaining ring (5) to the combining portion (8), wherein each of the connecting bands (29, 30) includes a first portion (51) adjacent to the separation line (4) and a second portion (52) adjacent to the incision line (21), and when the closing element (6) moves from the closed position to the open position, the first portion (51) is configured to expand radially so that the second portion (52) twists and passes under the first portion (51) to be between the first portion (51) and the neck (218).

20. The combined structure according to claim 19, wherein: There is a difference (Delta) between the outer diameter (Dmax) of the circular enlarged portion (223) and the diameter (Ds) of the outer surface (219) of the neck (218) immediately above the circular enlarged portion (223), and the distance (H) between the separation line (4) and the incision line (21) is equal to or greater than 0.8 times half of the difference (Delta).

21. A combined structure of a lid for a container and a neck (218) of the container, wherein: The neck (218) is delimited by an outer surface (219) from which a circular enlargement (223) projects, the outer surface (219) extending upwardly to a rim (220) of the neck (218), and wherein the cap comprises a side wall (2) extending around an axis (Z), on which a separation line (4) is provided for defining: - a retaining ring (5) intended to engage with said circular enlargement (223) so as to remain anchored to said neck (218), and a closure element (6) removably engageable with the neck (218) so as to be movable between a closed position and an open position, The separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), wherein no arrow-shaped hinge or thickness reduction area is provided in the joint portion, and the cover also has a cut line (21) extending transversely to the axis (Z) between the separation line (4) and the free edge (16) of the retaining ring (5), so that two connecting strips (21) are defined between the separation line (4) and the cut line (21). 9, 30), the connecting band (29, 30) connects the retaining ring (5) to the connecting portion (8), and wherein there is a difference (Delta) between the outer diameter (Dmax) of the circular enlarged portion (223) and the diameter (Ds) of the outer surface (219) of the neck (218) immediately above the circular enlarged portion (223), and the distance (H) between the separation line (4) and the incision line (21) is equal to or greater than 0.8 times half of the difference (Delta).

22. The combined structure according to claim 21, wherein: The coupling portion (8) has a dimension angle (W) around the axis (Z) which is greater than or equal to 20°.

23. The combined structure according to claim 21, wherein: The coupling portion (8) has a dimension angle (W) around the axis (Z), which is less than or equal to 120°.

24. The combined structure according to claim 21, wherein: When the closing element (6) is in the closing position, the cut line (21) is located in a plane arranged transversely to the axis (Z), and the edge (50) is defined by the cut line in a middle portion (24) of the cut line (21).

25. The combined structure according to claim 21, wherein: The bonding portion (8) is bonded to the connection strips (29, 30) without interposing a rupture line or a weakening line.

26. The combined structure according to claim 21, wherein: The side wall (2) is provided with a plurality of knurling lines (13) on the outer side, and the separation line (4) intersects with the knurling lines (13).

27. The combined structure according to claim 21, wherein: In the open position, the closure element (6) is rotated backwards relative to the neck (218) by an opening angle (A2), which is greater than or equal to 120°.

28. The combined structure according to claim 21, wherein: The closing element (6) is configured to generate vibrations that can be felt by a user when the closing element (6) moves from the closing position toward the opening position, wherein the vibrations are generated in a state of maximum interference between the coupling portion (8) and the circular enlarged portion (223).

29. A method of producing a lid for a container, comprising the steps of: - providing a cover for a container, said cover comprising a side wall (2) extending around an axis (Z) and a transverse wall (3) arranged at the end of said side wall (2), - a separation line (4) formed by cutting in the side wall (2), the separation line being used to define: a retaining ring (5) intended to remain anchored to the neck (218) of the container; and a closing element (6) capable of being removably engaged with the neck (218) for opening and closing the container, wherein the separation line (4) extends around the axis (Z) and is interrupted in the circumferential direction to leave a joint portion (8) between the retaining ring (5) and the closing element (6), in which no arrow-shaped hinge or area of ​​reduced thickness is provided, - forming a cut line (21) by cutting, the cut line (21) extending transversely to the axis (Z) so that two connecting strips (29, 30) are defined between the separation line (4) and the cut line (21), the connecting strips (29, 30) connecting the retaining ring (5) to the connecting portion (8).

30. The method of producing a cap for a container according to claim 29, wherein: The separation line (4) and the cut line (21) are formed by using a blade having an interrupted cutting edge to define a plurality of breakable bridges (7) along the separation line (4) and a plurality of breakable elements (70) along the cut line (21).

31. The method of producing a cap for a container according to claim 29, wherein: The cut line (21) is formed by using a blade having a flat cutting edge.

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