Closure cap for a container

Abstract

A closing cap (1') comprising a lateral wall (3) on which a first separating line (5') and a second separating line (6') are provided to define: a retaining ring (301); a closing element (302); a first connecting band (305) and a second connecting band (306) for keeping the closing element (302) and the retaining ring (301) joined to each other; a first tab (307) and a second tab (308), which are configured in such a way that, in a cap (1') open condition, when the cap (1') is overturned, the second tab (308) is at least partly superposed on the first tab (307). The first separating line (5') comprises a first plurality of stretches (701, 703, 711, 712) which comprises a first group of stretches (701, 703, 712) which are planar, and a second group of stretches (711) which are inclined; the second separating line (6') comprises a second plurality of stretches (702, 704, 705, 706, 707, 708, 709) which comprises a first set of stretches (702, 704, 708, 709) which are planar, and a second set of stretches (705, 706, 707) which are inclined. A first angular zone (801) and a second angular zone (802) delimit the first connecting band (305); a third angular zone (803) and a fourth angular zone (804) delimit the second connecting band (306)each of the above-mentioned angular zones is defined between two respective adjacent stretches of the second separating line (6'), wherein one stretch is selected in the first set of stretches (702, 704, 708, 709) and the further stretch is selected in the second set of stretches (705, 706, 707). A fifth angular zone (805) and a sixth angular zone (806) delimit the second connecting band (306) and each of them is defined between two respective adjacent stretches of the first separating line (5'), wherein one stretch is selected in the first group of stretches (701, 703, 712). Any angular zone, of the first angular zone (801), the second angular zone (802), the third angular zone (803), the fourth angular zone (804), the fifth angular zone (805) or the sixth angular zone (806) is rounded and is defined by a respective radius which is between 0.5 and 4 mm, preferably between 1 and 2 mm.

Description

[0001] DESCRIPTION

[0002] CLOSURE CAP FOR A CONTAINER

[0003] This invention relates to a closing cap for a container.

[0004] In detail, this invention relates to a closing cap for a container comprising a retaining ring, configured to remain anchored to a neck of the container, a closing element, configured to removably engage with the neck, and at least one connecting band, configured to keep the closing element connected to the retaining ring.

[0005] The cap according to the invention is particularly, but not exclusively, suitable for being applied on containers such as bottles intended to contain liquid substances.

[0006] There are prior art caps for containers comprising a cup-shaped body obtainable by means of compression or injection moulding, provided with a transversal wall and with a lateral wall extending around an axis, which are typically made of plastic material and are provided with a retaining ring and a closing element, joined to each other by a plurality of breakable bridges. When the closing cap is opened for the first time, the user causes the breakable bridges to break and the closing element separates from the retaining ring. The retaining ring remains associated with a neck of the container, whilst the closing element can be unscrewed by the user, who thereby separates the closing element from the container to access the contents of the container.

[0007] Then, the closing element may be screwed back onto the neck so as to close the bottle again.

[0008] For that purpose, the closing element is provided with an inner thread structure, suitable for engaging with an outer thread structure of the neck, to allow the cap to be unscrewed from and screwed back onto the neck. Connecting bands are also known, between the closing element and the retaining ring, in such a way as to prevent the closing element from being dropped in the surrounding environment.

[0009] Amongst the prior art documents, that which the Applicant considers to beclosest to the aim of this invention is US patent 11312544 which describes a cap for a container which has a cup-shaped body, provided with a transversal wall and a cylindrical lateral wall, wherein a retaining ring is positioned at an open end of the cup-shaped body.

[0010] A first separating line and a second separating line are provided on the lateral wall and are both formed by respective pluralities of stretches which in the cap define the closing element and the retaining ring, a first connecting band and a second connecting band, and wherein, during a step of opening of the cap from the container, the first connecting band and the second connecting band are configured to keep the closing element and the retaining ring joined to each other. The first separating line and the second separating line are also configured to define in the cap a first tab on the retaining ring and a second tab on the closing element, which are circumferentially interposed between the first connecting band and the second connecting band, in such a way that, in a cap open condition, when the cap is overturned, the second tab is at least partly superposed on the first tab.

[0011] When the cap is in the open condition, between the closing element and the retaining ring there is an interference which makes it difficult for the cap to be able to rotate around the neck.

[0012] The connecting bands, which keep the closing element associated with the retaining ring, must be sturdy, to prevent them from breaking due to use, and at the same time they must be deformable, to allow movement of the closing element relative to the neck when the container is opened.

[0013] In fact, the connecting bands allow the closing element to be moved away from the retaining ring, which remains anchored to a locking ring of the neck during opening of the container, and allow the closing element to be tilted so as to make it rotate and place it resting on the neck, when it is overturned. The sturdiness of the connecting bands is given by a resistance to breaking, when they are subjected to axial pulling, or radial pulling, or twisting.

[0014] The pulling of the connecting bands may be axial, when the closing elementis initially lifted upwards to move it away from the retaining ring, or radial, when the closing element is subsequently rotated and completely overturned, to place it resting on the neck.

[0015] The sturdiness of the connecting bands is directly proportionate to the height of the connecting bands, parallel to the axis, and also to the thickness of the lateral wall at the connecting bands, the thickness being measured perpendicularly to the axis, that is to say, radially.

[0016] In other words, the greater the height of each connecting band, or the thicker it is, the more resistant each connecting band is when subjected to stress in the form of pulling, or twisting, by the user during opening of the container. However, at the same time, the height and the thickness of each connecting band may make it difficult for a user both to pass it from the closed condition to the open condition, and vice versa, and to rotate the closing element until it is completely overturned. In fact, if each connecting band is made very tall and very thick, the user must use a lot of strength in order to be able to initially lift the closing element upwards, and then to be able to rotate it, and subsequently to be able to completely overturn it, in such a way as to position the second tab at least partly superposed on the first tab.

[0017] The technical purpose of this invention is therefore to provide a closing cap for containers which is capable of overcoming the disadvantages of the prior art.

[0018] One aim of this invention is therefore to provide a cap for a container, in particular a cap comprising a retaining ring, intended to remain associated with a neck of the container, and a closing element, removably engageable with the neck to allow a user to open or alternatively to close the container, which is capable of overcoming the disadvantages of the prior art.

[0019] Another aim of this invention is therefore to provide a cap for a container, in particular a cap provided with a retaining ring, a closing element, two connecting bands and two tabs, circumferentially interposed between the connecting bands, wherein a first tab is positioned on the retaining ring and a second tab is positioned on the closing element, wherein the connectingbands are sturdy, when they are subjected to pulling, axial or radial, or to twisting, but at the same time guarantee the user easy movement from the open condition to the closed condition.

[0020] The technical purpose specified and the aims specified are substantially achieved by a closing cap comprising the technical features set out in one or more of the appended claims. The dependent claims correspond to possible embodiments of the invention.

[0021] The invention can be better understood and implemented with reference to the accompanying drawings, which illustrate several example, non-limiting embodiments of it, in which:

[0022] Figure 1 is a perspective view of a closing cap according to the invention, in the closed condition and associated with a container, wherein a first separating line and a second separating line are provided on a lateral wall, to define a retaining ring and a closing element, and they define in the cap a first connecting band and a second connecting band, a first tab and a second tab;

[0023] Figure 2 is a front view of the cap of Figure 1 ;

[0024] Figure 3 is another front view of the cap of Figure 1 ;

[0025] Figure 4 is another perspective view of the cap of Figure 1 , in an initial step of opening, in which a user has separated the closing element from the retaining ring;

[0026] Figure 5 is a further perspective view of the cap of Figure 1 , in which the cap is in the open condition in which it has been rotated and overturned, the second tab being at least partly superposed on the first tab;

[0027] Figure 6 schematically illustrates extending in plan view the first separating line and the second separating line of the cap of Figure 1 ;

[0028] Figure 7 schematically illustrates extending in plan view a variant of the cap of Figure 1 , in which the first separating line and the second separating line are variants of those of the cap of Figure 1 and define rounded angular zones in accordance with this invention;

[0029] Figure 8 is a cross-section of the closing cap of Figure 1.With reference to Figures 1 to 8, the numeral 1 denotes a closing cap 1 for a container 2, of which container only a neck 201 is shown, the container being in particular a bottle intended to contain a liquid substance such as a drink.

[0030] It should be noticed that elements common to the various embodiments will be indicated with the same reference numbers.

[0031] The cap 1 is made of polymeric material. Any polymeric material suitable for moulding may be used to obtain the cap 1.

[0032] The cap 1 is shown in Figure 1 in a closed condition, in which the cap 1 is applied on the container 2.

[0033] The cap 1 comprises a lateral wall 3 which extends around an axis Z, and a transversal wall 4 positioned at one end of the lateral wall 3, so as to close that end. The transversal wall 4 extends transversally, in particular perpendicularly, to the axis Z. The transversal wall 4 may be flat, even though other shapes are theoretically possible. In the example illustrated, the transversal wall 4 has a substantially circular shape in plan view.

[0034] The lateral wall 3 and the transversal wall 4 define a cup-shaped body, obtainable by compression moulding or injection moulding, suitable for receiving an end portion of the neck 201 of the container 2, so that the cap 1 can close that same container 2.

[0035] In particular, the lateral wall 3 is connected to the transversal wall 4 by means of a connecting zone which may be shaped, in cross-section, like a rounded edge or a circular arc connection.

[0036] It should be noticed that the lateral wall 3 may be provided, on an outer surface thereof, with a plurality of knurling lines 312, extending parallel to the axis Z and suitable for facilitating gripping of the cap 1 by the user or by the capping machine which applies the cap 1 on the container 2 to be closed.

[0037] The cap 1 comprises a retaining ring 301 , which is configured to remain anchored to the neck 201 of the container 2 and extends as far as a free edge 303 of the lateral wall 3.The cap 1 also comprises a closing element 302 removably engageable with the neck 201 , so as to open or close the container 2. In detail, the closing element 302 is configured to open, or close a supply opening 203 of the neck 201.

[0038] It should be noticed that the knurling lines 312 may be positioned in the closing element 302, as shown in the accompanying Figures, but they may also optionally continue, according to a variant not illustrated, in the retaining ring 301.

[0039] The lateral wall 3 of the cap 1 is internally provided with a coupling structure 304, configured to removably couple the closing element 302 to the neck 201 of the container 2, in such a way that the cap 1 is movable from the closed condition, in which the cap 1 closes the supply opening 203 of the container 2, to an open condition.

[0040] The coupling structure 304 of the cap 1 is positioned inside the closing element 302 and is shaped to engage with a corresponding coupling structure 204 present on the outside of the neck 201 of the container 2. The coupling structure 304 of the closing element 302 and the coupling structure 204 of the neck 201 are, as illustrated in the accompanying figures, made in the form of a thread structure. In this case, the passage from the closed condition to the open condition is performed by means of a rotation of the closing element 302 relative to the neck 201 of the container 2, as shown in Figure 4.

[0041] The closing element 302 completely disengages from the neck 201 when the coupling structure 304 of the cap 1 , that is to say, the thread structure 304 of the cap 1 , is unscrewed from the coupling structure 204 of the neck 201 , that is to say, from the thread structure 204 of neck 201.

[0042] As regards the coupling structure 304, the thread structure may be made using a single helical thread, or using multiple helical threads, for example using two helical threads, or three helical threads.

[0043] According to one alternative embodiment, not illustrated, the coupling structure 304 may comprise at least one circular ridge, continuous orinterrupted, for removably locking the cap 1 on the neck 201 using pressure (also called “snapcap”). In other words, the coupling structure 304 may comprise a hinge structure, interposed between the closing element 302 and the retaining ring 301 , which allows the closing element 302 to be rotated relative to the retaining ring 301 around an axis of the hinge structure itself.

[0044] The retaining ring 301 comprises an engaging element 309, shown at least in Figure 4 and in Figure 8, which projects inwards and is configured to engage with a locking ring (not illustrated) of the neck 201 of the container 2 during a passage from a closed condition to an open condition of the cap 1.

[0045] It should be noticed that the engaging element 309 may project from the free edge 303, or from an edge zone of the retaining ring 301 placed near the free edge 303.

[0046] When the cap 1 is in the closed condition, the engaging element 309 is positioned in a bent configuration between the retaining ring 301 and the neck 201 of the container 2.

[0047] The engaging element 309 may be made, in the known way, as a plurality of projecting flaps or as a single continuous flap. In other words, the engaging element 309 may be interrupted, as shown in the accompanying Figures, or continuous (not illustrated).

[0048] The plurality of projecting flaps, or the single continuous flap, have at most a length, measured as the distance from an initial end of the engaging element 309, which is appropriately selected in such a way that they can engage with the locking ring of the neck 201 in the first passage from the closed condition to the open condition of the cap 1.

[0049] For example, the engaging element 309 may comprise a number of projecting flaps greater than or equal to 4 and less than or equal to 24; preferably greater than or equal to 6 and less than or equal to 16.

[0050] Therefore, the engaging element 309 is positioned in a lower portion of the retaining ring 301 , and therefore of the cap 1, when the cap 1 is joined tothe container 2 and the container 2 is positioned vertically. The engaging element 309 extends circumferentially for the entire cap 1.

[0051] The locking ring (not illustrated) projects from an outer surface of the neck 201 and is an annular enlargement, which extends in a plane placed transversally to the axis Z and has, considering a plane passing through the axis Z, a substantially triangular cross-section. An upper wall of the locking ring, directed towards the supply opening 203, is inclined relative to a lower wall, which is directed towards a bottom (not illustrated) of the container 2 and is substantially planar. In other words, the locking ring of the neck 201 has a frustoconical shape and the upper wall and the lower wall are connected to each other by an outer edge.

[0052] When the cap 1 is in the closed condition and has never yet been opened, the engaging element 309 is placed at least partly below the locking ring to engage with the lower wall of the locking ring.

[0053] With reference to Figure 8, it should be noticed that the cap 1 may also be provided with an annular inner sealing lip 402, which projects from the transversal wall 4 towards the inside of the cap 1. The inner sealing lip 402 is suitable for being inserted into the neck 201 of the container for engaging in a sealed way with an inner lateral surface of the neck 201. In particular, the inner sealing lip 402 may be delimited by a convex sealing surface 403 for making contact with the above-mentioned inner lateral surface.

[0054] With reference to Figure 1 to 6, the cap 1 comprises a first separating line 5 and a second separating line 6 which are provided on the lateral wall 3 to define the retaining ring 301 and the closing element 302.

[0055] The first separating line 5 and the second separating line 6 do not intersect. The first separating line 5 and the second separating line 6 may be made at the moment of forming of the cup-shaped body, if for example the cupshaped body is made by means of an injection moulding method. Alternatively, or in addition, the first separating line 5 and the second separating line 6 may be made after the cup-shaped body has been made, using a cutting device which cuts the lateral wall 3, using through-cuts orlines of weakness which only partly pass through the lateral wall 3.

[0056] In detail, the first separating line 5 and the second separating line 6 are configured in such a way as to define a first connecting band 305 and a second connecting band 306 which, during a step of opening the cap 1 from the container 2, keep the closing element 302 and the retaining ring 301 joined to each other.

[0057] Optionally, along the first separating line 5 there may be a plurality of breakable bridges, not illustrated, whilst along the second separating line 6 there may be a plurality of breakable elements, also not illustrated, both being intended to break the first time the cap 1 is opened.

[0058] Preferably, both the breakable bridges are provided along the first separating line 5 and the breakable elements are provided along the second separating line 6 even if, optionally, the breakable elements may be absent along the second separating line 6.

[0059] The first separating line 5 may have a number of breakable bridges which is between 0 and 36, more preferably between 4 and 14, even more preferably between 5 and 10. The second separating line 6 may have a number of breakable bridges which is between 0 and 6, preferably between 1 and 2.

[0060] The breakable bridges and / or the breakable elements may have a radial thickness of between 0.2 mm and 1.2 mm, preferably between 0.6 mm and 0.95 mm.

[0061] The breakable bridges and / or the breakable elements may have a circumferential extent of between 0.1 mm and 1.5 mm, preferably between 0.2 mm and 1 mm, even more preferably between 0.35 mm and 0.7 mm. The first separating line 5 and the second separating line 6 also define, in the lateral wall 3, a first tab 307, which is part of the retaining ring 301 , and a second tab 308, which is part of the closing element 302, which are circumferentially interposed between the first connecting band 305 and the second connecting band 306 and are configured in such a way that, in a cap 1 open condition, when the cap 1 is overturned as illustrated in Figure5, the second tab 308 is at least partly superposed on the first tab 307. It should be noticed that both the first tab 307 and the second tab 308 may have breakable elements.

[0062] In detail, the first connecting band 305, the first tab 307, the second tab 308 and the second connecting band 306 are positioned circumferentially one after another, in sequence.

[0063] Thanks to the elasticity of the first connecting band 305 and of the second connecting band 306, and thanks to the shape and to the position of the first tab 307 and of the second tab 308, it is possible to keep the closing element 302 stably in the overturned position, when the cap 1 is in the open condition.

[0064] Both the first separating line 5 and the second separating line 6 comprise multiple stretches which, thanks to their arrangement and their shape, define the first connecting band 305, the second connecting band 306, the first tab 307 the second tab 308.

[0065] In detail, the first separating line 5 comprises a first plurality of stretches and the second separating line 6 comprises a second plurality of stretches. The first plurality of stretches comprises a first group of stretches which are planar and a second group of stretches which in contrast are inclined, relative to an axis parallel to the axis Z.

[0066] The second plurality of stretches comprises a first set of stretches which are planar and a second set of stretches which in contrast are inclined, relative to an axis parallel to the axis Z.

[0067] A first angular zone 801 and a second angular zone 802 delimit the first connecting band 305 on a side directed towards the first tab 307.

[0068] A third angular zone 803 and a fourth angular zone 804 delimit the second connecting band 306 on a side directed towards the second tab 308.

[0069] Each angular zone, selected from the first angular zone 801 , the second angular zone 802, the third angular zone 803 and the fourth angular zone 804 is defined between two respective adjacent stretches of the second separating line 6, wherein one stretch of the two adjacent stretches isselected in the first set of stretches, which is planar, and the further stretch of the two adjacent stretches is selected in the second set of stretches, which in contrast is inclined.

[0070] A fifth angular zone 805 and a sixth angular zone 806 delimit the second connecting band 306 on an opposite side, relative to the second tab 308. It should be noticed that the opposite side is considered circumferentially, relative to the second tab 308.

[0071] Both the fifth angular zone 805, and the sixth angular zone 806 is defined between two respective adjacent stretches of the first separating line 5, wherein one stretch of the two adjacent stretches is selected in the first group of stretches, which is planar, and the further stretch of the two adjacent stretches is selected in the second group of stretches, which is inclined.

[0072] The first connecting band 305 is made between a first stretch 701 of the first separating line 5 and a second stretch 702 of the second separating line 6, wherein the first stretch 701 belongs to the first group, and is therefore planar, and the second stretch 702 belongs to the first set and, therefore, is also planar.

[0073] The second connecting band 306 is made between a third stretch 703 of the first separating line 5, which belongs to the first group, and is therefore planar, and a fourth stretch 704 of the second separating line 6, which belongs to the first set, and therefore is also planar.

[0074] The first tab 307 is made between a fifth stretch 705 and a sixth stretch 706 of the second separating line 6, which belong to the second set and therefore are inclined.

[0075] In detail, the fifth stretch 705 and the sixth stretch 706 define lateral edges of the first tab 307.

[0076] The first tab 307 has a respective first end 307A (shown in Figure 4) which is formed by an eighth stretch 708 of the second separating line 6, wherein the eighth stretch 708 connects the fifth stretch 705 and the sixth stretch 706 to each other and belongs to the first set, being planar.The first angular zone 801 is therefore defined between the second stretch 702 and the fifth stretch 705. The second angular zone 802 is defined between the fifth stretch 705 and the eighth stretch 708.

[0077] The second tab 308 is made between the sixth stretch 706 and a seventh stretch 707 of the second separating line 6, which belong to the second set and are inclined, and has a respective second end 308A (shown in Figure 4) which is formed by a ninth stretch 709 of the second separating line 6, the ninth stretch 709 connecting the sixth stretch 706 and the seventh stretch 707 to each other and belonging to the first set, being planar.

[0078] In detail, the sixth stretch 706 and the seventh stretch 707 define lateral edges of the second tab 308.

[0079] The fifth stretch 705, the sixth stretch 706, and the seventh stretch 707 of the second separating line 6 are inclined, relative to respective axes parallel to the axis Z.

[0080] It should be noticed that the sixth stretch 706 of the second separating line 6 simultaneously defines a lateral edge both of the first tab 307, and of the second tab 308.

[0081] The third angular zone 803 is defined between the ninth stretch 709 and the seventh stretch 707. The fourth angular zone 804 is defined between the seventh stretch 707 and the fourth stretch 704.

[0082] The first separating line 5 comprises an eleventh stretch 711 , which is also inclined and belongs to the second group and has a first end connected to the third stretch 703 and a second end connected to a joining stretch 712, which is planar and is connected to the first stretch 701.

[0083] The fifth angular zone 805 is defined between the third stretch 703 and the eleventh stretch 711. The sixth angular zone 806 is defined between the eleventh stretch 711 and the joining stretch 712.

[0084] It should be noticed that the first stretch 701 , the fourth stretch 704 and the eighth stretch 708 are planar since they lie in a first plane and that the second stretch 703, the third stretch 703 and the ninth stretch 709 are planar since they lie in a second plane.The first and the second plane may be parallel to each other.

[0085] That means that the first end 307A of the first tab 307, which lies in the first plane, may be parallel to the second end 308A of the second tab 308, which lies in the second plane.

[0086] That also means that, advantageously, the first connecting band 305, the second connecting band 306, the first tab 307 and the second tab 308 may be delimited between two planes and that, therefore, if the stretches of which they are made are obtained with respective cutting knives, the cap 1 is simpler to make.

[0087] A seventh angular zone 807 and an eighth angular zone 808 respectively delimit the first tab 307 on a side directed towards the second tab 308, and the second tab 308 on a side directed towards the first tab 307.

[0088] The seventh angular zone 807 the eighth angular zone 808 are defined between two respective adjacent stretches of the second separating line 6, wherein one stretch is selected in the first set of stretches and the further stretch is selected in the second set of stretches.

[0089] The seventh angular zone 807 is defined between the ninth stretch 709 and the sixth stretch 706. The eighth angular zone 808 is defined between the sixth stretch 706 and the eighth stretch 708.

[0090] In the cap 1 shown in Figures 1 to 6, it should be noticed that the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805, the sixth angular zone 806, the seventh angular zone 807 and the eighth angular zone 808 are all defined by angles without smoothing or rounding, that is to say, angles (or edges, if the angular zones are considered as three-dimensional elements) that are sharp.

[0091] In Figure 7, in accordance with the invention, a cap T is shown which is a variant of the cap 1 shown in Figures 1 to 6 and differs from the cap 1 in that it has a first separating line 5’ and a second separating line 6’ which are respective variants of the first separating line 5 and of the second separating line 6, shown in Figures 1 to 6.Everything previously said for the cap 1 remains valid, but for the sake of brevity will not be repeated herein.

[0092] In detail, also remaining valid, for the first separating line 5’ and for the second separating line 6’, is the definition previously given for the stretches from the first stretch 701 to the twelfth stretch 712, defined for the first separating line 5 and for the second separating line 6, and for the angular zones from the first angular zone 801 to the eighth angular zone 808, which for the sake of brevity will not be repeated herein.

[0093] In accordance with the invention, in the cap 1’ shown in Figure 7, at least one angular zone, selected from the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805 or the sixth angular zone 806, is rounded and is defined by a respective radius which is between 0.5 and 4 mm, preferably between 1 and 2 mm.

[0094] Thanks to at least this angular zone, defined with the above-mentioned radius and which, at least partly, delimits the first connecting band 305, or the second connecting band 306, it is possible to increase the resistance to breaking of the respective first connecting band 305, or of the second connecting band 306, when the first connecting band 305, or the second connecting band 306 is subjected to pulling.

[0095] Moreover, this same radius size, as defined above, increases the resistance to pulling and to twisting of the respective first connecting band 305, or of the second connecting band 306, before the respective first connecting band 305, or the second connecting band 306 deteriorates.

[0096] In other words, rather than having a cap 1 wherein two adjacent stretches of the first separating line 5, or of the second separating line 6 define a respective angular zone with sharp angles, as shown in Figures 1 to 6, in the cap 1 ’ of Figure 7 in the first separating line 5’ and the second separating line 6’ at least one angular zone defined by two adjacent stretches of the first separating line 5’, or of the second separating line 6’, is rounded.

[0097] Therefore, the separating line 5’ and / or the second separating line 6’ of thecap 1 ’ differ respectively from the first separating line 5 and from the second separating line 6 of the cap 1 in that at least one angular zone with a rounded angle (or edge) is provided.

[0098] According to one embodiment, the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805 and the sixth angular zone 806 are all rounded and are respectively defined by a first radius R1 , a second radius R2 a third radius R3, a fourth radius R4, a fifth radius R5 and a sixth radius R6, as shown in Figure 7.

[0099] As previously described, the first angular zone 801 is defined between the second stretch 702 and the fifth stretch 705; the second angular zone 802 is defined between the fifth stretch 705 and the eighth stretch 708; the third angular zone 803 is defined between the ninth stretch 709 and the seventh stretch 707; the fourth angular zone 804 is defined between the seventh stretch 707 and the fourth stretch 704; the fifth angular zone 805 is defined between the third stretch 703 and the eleventh stretch 711 ; the sixth angular zone 806 is defined between the eleventh stretch 711 and the joining stretch 712.

[0100] In this case, at least one radius selected from the first radius R1 , the second radius R2, the third radius R3, the fourth radius R4, the fifth radius R5 and the sixth radius R6 is between 0.5 and 4 mm, preferably between 1 and 2 mm.

[0101] If the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805 and the sixth angular zone 806 are all rounded and if all of the above-mentioned respective radii, that is to say, the first radius R1 , the second radius R2, the third radius R3, the fourth radius R4, the fifth radius R5, and the sixth radius R6 are between 0.5 and 4 mm, preferably between 1 and 2 mm, it was ascertained that the first connecting band 305 and the second connecting band 306 guarantee a resistance to breaking, if pulled, which is approximately 10% greater, and even more than 10% in some cases, thana cap in which the same angular zones 801 , 802, 803, 804, 805, and 806 are not rounded, or are rounded but whose respective radii R1 , R2, R3, R4, R5 and R6 are not within the range indicated above.

[0102] In order to ascertain the resistance to pulling of the first connecting band 305 and / or of the second connecting band 306, the Applicant carried out comparative experimental tests between caps 1 , in which two adjacent stretches define a respective angular zone with sharp angles (or edges) as shown in Figures 1 to 6, and respective caps 1’ in accordance with this invention, having angular zones with respective rounded angles (or edges). In particular, a plurality of caps 1 ’ in accordance with this invention were selected wherein the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805 and the sixth angular zone 806 are all rounded and are respectively defined by a first radius R1 , a second radius R2 a third radius R3, a fourth radius R4, a fifth radius R5 and a sixth radius R6, wherein all of the above-mentioned radii are between 0.5 mm and 4 mm, preferably between 1 mm and 2 mm.

[0103] In particular, a plurality of caps 1 ’ having the above-mentioned radii from R1 to R6, measured in mm, were used, as shown in table 1 below.

[0104] Table 1

[0105] RADIUS NAME RADIUS VALUE (mm) first radius R1 1.53

[0106] second radius R2 1.76

[0107] third radius R3 1.62

[0108] fourth radius R4 1.70

[0109] fifth radius R5 1.62

[0110] sixth radius R6 1.76

[0111]

[0112] For that purpose the Applicant designed and built a test device (not illustrated) comprising a vice, for retaining a container 2 in position, and anarticulated arm, provided with a hook-shaped curved end.

[0113] The curved end is configured to stably grasp from the inside a closing element 302, of a cap 1 , or T, when the closing element 302, associated with the container 2, is disengaged from the neck 201 and to stress the closing element 302 by pulling it away from the neck, axially and radially, in order to ascertain, respectively, the resistance to axial pulling and to radial pulling of the first connecting band 305 and / or of the second connecting band 306.

[0114] For the comparative experimental tests a first collection of twenty-four caps 1 was selected in which two adjacent stretches define a respective angular zone with sharp angles (or edges), as shown in Figures 1 to 6, and a second collection of another twenty-four caps T in accordance with this invention, having angular zones with respective rounded angles (or edges), as shown in Figure 7.

[0115] It should be noticed that caps 1 and 1 ’ were selected, for the first collection and for the second collection, with the same sizing (height, diameter, thickness of the walls, type of coupling structure, etc.) which only differ due to the fact that the caps 1 ’ of the second collection have respective rounded angles (or edges), as was previously indicated in detail, in such a way as to ascertain precisely how such rounded angles (or edges) affect the resistance to axial pulling and the resistance to radial pulling.

[0116] In order to test the resistance to axial pulling, a first test method was developed according to which twelve caps 1 of the first collection and twelve caps 1 ’ of the second collection were tested one after another.

[0117] Each cap 1 and T, never previously opened, was associated with a container 2 in the closed condition and was then stressed by rotating it, from the closed condition to the open condition until the breakable bridges broke thereby separating the closing element 302 from the retaining ring 301. The container 2 was positioned resting on the test device and the vice was operated so as to retain the container 2 at the bottom, locking it in the test device.The closing element 302 was positioned parallel to the neck of the container (that is to say, with the transversal wall 4 parallel to the axis Z), in an intermediate position relative to the open condition, in such a way as to expose a portion of the closing element 302 itself higher up than the supply opening 203 of the container 2 and to allow the positioning of the hookshaped curved end of the test device inside the closing element 302.

[0118] The arm of the test device was then operated in such a way as to pull the hook upwards, that is to say, axially along a line parallel to the axis Z, so as to consequently pull the closing element 302 upwards, until causing the breaking of the first connecting band 305 and / or the breaking of the second connecting band 306.

[0119] In this way a first pulling force in Newtons (N) necessary to break the first connecting band 305 and / or the second connecting band 306 was recorded and this first pulling force was recorded as an axial pulling force for each cap 1 , or T.

[0120] In order to test the resistance to radial pulling, a second test method was developed according to which twelve caps 1 of the first collection and twelve caps 1 ’ of the second collection were tested one after another.

[0121] Each cap 1 and T, never previously opened, was associated with a container 2 in the closed condition and was then stressed by rotating it, from the closed condition to the open condition until the breakable bridges broke thereby separating the closing element 302 from the retaining ring 301. The container 2 was positioned resting on the test device and the vice was operated so as to retain the container 2 at the bottom, locking it in the test device.

[0122] The closing element 302 was positioned in the open condition shown in Figure 5, in which the cap 1 , or T, is completely overturned.

[0123] The hook-shaped curved end of the test device was positioned inside the closing element 302 and was configured to radially pull the closing element 302, away from the neck 201 and along a line perpendicular to the axis Z, until causing the breaking of the first connecting band 305 and / or thebreaking of the second connecting band 306 whilst the container 2 was retained at the bottom associated with the test device.

[0124] In this way a second pulling force in Newtons (N) necessary to break the first connecting band 305 and / or the second connecting band 306 was recorded and this second pulling force was recorded as a radial pulling force for each cap 1 , or 1 ’.

[0125] Table 2 below shows the axial pulling force and the radial pulling force in Newtons (N) which are necessary to break the first connecting band 305 and / or the second connecting band 306 for the caps 1 of the first collection and for the caps 1 ’ of the second collection.

[0126] Table 2

[0127] Caps 1 of the first collection Caps T of the second collection Test Axial pulling Radial pulling Axial pulling Radial pulling 1 39 35 42 39

[0128] 2 34 34 40 38

[0129] 3 37 35 40 39

[0130] 4 32 36 39 40

[0131] 5 37 36 42 38

[0132] 6 34 35 41 36

[0133] 7 36 35 38 39

[0134] 8 39 33 41 39

[0135] 9 38 37 42 38

[0136] 10 43 33 42 38

[0137] 11 42 34 40 37

[0138] 12 35 34 41 37

[0139]

[0140] From table 2 above it can be seen how the caps 1 ’ having rounded angles in accordance with this invention are more resistant to the pulling force, both axial, and radial. Noisy data only appear for the caps 1 and 1’ of tests 10and 11 , since the above-mentioned caps 1 with sharp angles (or edges) were more resistant to the axial pulling force, but not to the radial pulling force, than the caps 1 ’ with rounded edges.

[0141] Processing the data obtained from the comparative experimental tests indicated above and averaging the axial pulling force and the radial pulling force for the caps 1 of the first collection and for the caps 1 ’ of the second collection, it can be seen in table 3 below how the caps 1’ having rounded angles in accordance with this invention are on average more resistant to the pulling force, both axial, and radial, since the pulling force capable of breaking the first connecting band 305 and / or the second connecting band 306 is on average higher.

[0142] Table 3

[0143] Caps 1 of the first collection Caps T of the second collection Test Axial pulling Radial pulling Axial pulling Radial pulling Average 37 35 41 38

[0144] Min 32 33 38 36

[0145] Max 43 37 42 40

[0146] Range 11 4 4 4

[0147]

[0148] Also important is the fact that, as well as being on average more resistant to the axial pulling force, the caps 1 ’ in accordance with the invention do not have great variability in the resistance to axial pulling and therefore may be manipulated by a user with a number of opening and / or closing cycles of the cap 1 ’ certainly greater than a cap 1 in which the same angular zones are not rounded, or are rounded but whose respective radii are not within the range indicated above.

[0149] Therefore, when the first angular zone 801 , the second angular zone 802, the third angular zone 803, the fourth angular zone 804, the fifth angular zone 805 and the sixth angular zone 806 are all rounded and the respective radii R1 , R2, R3, R4, R5 and R6 are between 0.5 and 4 mm, preferablybetween 1 and 2 mm, it was also ascertained that the first connecting band 305 and the second connecting band 306 guarantee a resistance to twisting such that it guarantees a number of opening and / or closing cycles of the cap 1 ’ greater than or equal to 15, compared with a cap 1 in which the same angular zones are not rounded, or are rounded but whose respective radii are not within the range indicated above.

[0150] The fact that a predetermined number of opening and / or closing cycles is guaranteed and that this number is high allows the obtainment of a cap T in which the closing element 302 continues to be connected to the retaining ring 301 during the entire normal cycle of use of the container 2 by the user, before the container 2 is disposed of amongst the waste.

[0151] As previously described, the seventh angular zone 807 and the eighth angular zone 808 respectively delimit the first tab 307 on a side directed towards the second tab 308, and the second tab 308 on a side directed towards the first tab 307.

[0152] In the cap T in accordance with the invention at least one angular zone, selected from the seventh angular zone 807 and the eighth angular zone 808 is rounded and is defined by a respective radius which is between 0.5 and 4 mm, preferably between 1 and 2 mm.

[0153] Thanks to the radius defined for the seventh angular zone 807, or for the eighth angular zone 808, it is possible to prevent the first tab 307 and the second tab 308 from being able to jam on each other when the cap 1 , after having been removed from the coupling structure 204 of the neck 201 , is rotated by the user and positioned in the completely overturned open condition.

[0154] In fact, when the second tab 308 rotates to position itself at least partly superposed on the first tab 307, it is the seventh angular zone 707 which, rotating after having been lifted, risks engaging with the eighth angular zone 808 and therefore interfering with it. Thanks to the fact that at least one angular zone of the seventh angular zone 807 and the eighth angular zone 808 is rounded, a sharp angle (or edge) is eliminated and in that way therisk of interference between the first tab 307 and the second tab 308 is reduced.

[0155] The seventh angular zone 807 and the eighth angular zone 808 may both be rounded, in which case the seventh angular zone 807 is defined by a seventh radius R7 and the eighth angular zone 808 is defined by an eighth radius R8.

[0156] At least one radius selected from the seventh radius R7 and the eighth radius R8 is between 0.5 and 4 mm, preferably between 1 and 2 mm. According to one embodiment, the seventh radius R7 and the eighth radius R8 are both between 0.5 and 4 mm, preferably between 1 and 2 mm.

[0157] If both the seventh angular zone 807 and the eighth angular zone 808 are rounded and respectively with the seventh radius R7 and the eighth radius R8 included in the above-mentioned range, the risk of interference is further reduced and in that way it is possible to prevent the second tab 308 from being able to jam against the first tab 307.

[0158] For the comparative experimental tests previously described, carried out for the purpose of ascertaining the resistance to pulling of the first connecting band 305 and / or of the second connecting band 306, caps 1 ’ having the seventh radius R7 and the eighth radius R8, measured in mm, as indicated in table 4 below were used.

[0159] Table 4

[0160] RADIUS NAME RADIUS VALUE (mm) seventh radius R7 1.79

[0161] eighth radius R8 1.41

[0162]

[0163] According to one embodiment, the seventh radius R7, or the eighth radius R8, is greater than any radius selected from the first radius R1 , the second radius R2, the third radius R3, the fourth radius R4, the fifth radius R5 and the sixth radius R6.

[0164] The seventh radius R7 and the eighth radius R8 may also both be greaterthan any radius selected from the first radius R1 , the second radius R2, the third radius R3, the fourth radius R4, the fifth radius R5 and the sixth radius R6.

[0165] In fact, it may be advantageous for the seventh angular zone 807 and / or the eighth angular zone 808 to have radii as large as possible, within the range indicated above, whilst that is not necessary for the remaining radii R1 , R2, R3, R4, R5, and R6, which in contrast may have smaller dimensions although being between 0.5 and 4 mm, preferably between 1 and 2 mm, in order to increase the resistance to pulling and to twisting.

[0166] In the case of the caps 1’ used for the comparative experimental tests previously described, it should be noticed that the seventh radius R7 of the seventh angular zone 807, equal to 1.79 mm, is greater than all of the radii, from the first radius R1 to the sixth radius R6, supplied in table 1 above. As already indicated, the first connecting band 305, the second connecting band 306, the first tab 307 and the second tab 308 may be delimited between two planes and, therefore, if the stretches of which they are made are obtained with respective cutting knives, the cap 1 , or 1 ’, is simpler to make.

[0167] A first height H1 of the first connecting band 305, in this case, may coincide with a second height H2 of the second connecting band 306, each measured along an axis parallel to the axis Z, since the connecting bands 305, 306 are between the first plane and the second plane.

[0168] Both the first plane and the second plane may be perpendicular to the axis Z, as shown in the accompanying Figures.

[0169] Therefore, the first separating line 5, or 5’, comprises in sequence (anticlockwise, with reference to Figures 6 and 7) the first plurality of stretches which comprises: the first stretch 701 and the joining stretch 712, which are adjacent and lie in the same first plane, the eleventh stretch 711 , which is inclined and joins the joining stretch to the third stretch 703, and finally the third stretch 703, which in contrast lies in the second plane.

[0170] Therefore, the second separating line 6, or 6’, comprises in sequence (anti-clockwise, with reference to Figures 6 and 7) the second plurality of stretches which comprises: the fourth stretch 704, which lies in the first plane, the seventh stretch 707, which is inclined and joins the fourth stretch 704 to the ninth stretch 709, the ninth stretch 709 itself which lies in the second plane, the sixth stretch 706, which is inclined and joins the ninth stretch 709 to the eighth stretch 708, the eighth stretch 708 itself which lies in the first plane, the fifth stretch 705, which is inclined and joins the eighth stretch 708 to the second stretch 702, the second stretch itself 702 which lies in the second plane.

[0171] The first connecting band 305 is internally delimited, considering the side directed towards the first tab 307, by the fifth stretch 705 of the second separating line 6, or 6’.

[0172] Optionally, the first separating line 5, or 5’, may comprise a tenth stretch 710, which has a first end connected to the first stretch 701 and a second end which is free, that is to say, is connected neither to the first separating line 5, or 5’, nor to the second separating line 6, or 6’.

[0173] The tenth stretch 710 is interposed between the first stretch 701 and the joining stretch 712.

[0174] The tenth stretch 710 is also inclined, relative to an axis parallel to the axis Z, but may have a very different inclination compared with the fifth stretch 705, with the sixth stretch 706, and with the seventh stretch 707 of the second separating line 6, or 6’. For example, the tenth stretch 710 may even be parallel to the axis Z, that is to say, it may extend axially.

[0175] A ninth angular zone 809 delimits the first connecting band 307 on an opposite side, relative to the first tab 307, the ninth angular zone 809 being between the first stretch 701 and the tenth stretch 710 of the first separating line 5, or 5’.

[0176] It should be noticed that the opposite side is considered circumferentially, relative to the first tab 307.

[0177] In the cap 1 of Figures 1 to 6 the ninth angular zone 809 has a sharp angle (or edge). In the cap T in accordance with the invention, the ninth angularzone 809 is rounded, as shown in Figure 7.

[0178] The ninth angular zone 809 is defined by a ninth radius R9, also between 0.5 and 4 mm, preferably between 1 and 2 mm.

[0179] In this way, the first connecting band 305 is externally delimited, considering the opposite side to that of the first tab 307, by the tenth stretch 710 of the first separating line 5, or 5’.

[0180] A first distance between the free second end of the tenth stretch 710 and a first end of the second separating line 6, or 6’, acts as a first outer hinge element, which is configured to connect the first connecting band 305 to the retaining ring 301.

[0181] A second distance between a free end of the first stretch 701 , which coincides with a first end of the first separating line 5, or 5’, and the fifth stretch 705 acts as a first inner hinge element, which is configured to connect the first connecting band 305 to the closing element 302.

[0182] A third distance between a second end of the first separating line 5, or 5’, which coincides with a free end of the third stretch 703 and the seventh stretch 707 acts as a second inner hinge element, which is configured to connect the second connecting band 305 to the retaining ring 301.

[0183] A fourth distance between a second end of the separating line 6, or 6’, which coincides with a free end of the fourth stretch 704, and the eleventh stretch 711 acts as a second outer hinge element and is configured to connect the second connecting band 306 to the closing element 302.

[0184] The first connecting band 305 and the second connecting band 306, for both the caps 1 and 1 ’, extend circumferentially respectively for a first angular extent A1 and a second angular extent A2 and have a respective first length 305L and a respective second length 306L, measured circumferentially. The first angular extent A1 is defined by the angle in which both the first stretch 701 and the second stretch 702 are present, that is to say, by the angle in which the first stretch 701 and the second stretch 702 are axially superposed.

[0185] The second angular extent A2 is defined by the angle in which both the thirdstretch 703 and the fourth stretch 704 are present, that is to say, by the angle in which the third stretch 703 and the fourth stretch 704 are axially superposed.

[0186] Now considering an external diameter De of the retaining ring 301 and considering a sum SL of the lengths of the connecting bands, obtained by adding together the first length 305L and the second length 306L.

[0187] SL= 305L+306L

[0188] Advantageously, a ratio of the external diameter De to the sum of the lengths SL indicated above may be greater than or equal to 0.5 and less than or equal to 4.0.

[0189] 0.5<= De / SL <= 4.0

[0190] Preferably, that ratio may be greater than or equal to 1.0 and less than or equal to 3.5;

[0191] 1.5<= De / SL <= 3.5

[0192] In fact, the Applicant has observed that the sum SL of the first length 305L and of the second length 306L expresses the flexibility of the cap 1 , or 1’, since it expresses how far the closing element 302 can move away from the retaining ring 301 , thanks to the first connecting band 306 and thanks to second connecting band 307.

[0193] At the same time, the external diameter De of the retaining ring 301 expresses a stiffness of the cap 1 , or 1 ’, since it is on this diameter De that there extend, in sequence, the first tab 307 and the second tab 308 which are superposed when the cap 1 , or 1’, is in the open condition and is overturned.

[0194] The Applicant has ascertained that, if the ratio indicated above De / SL is between 0.5 and 4.0, the closing element 302 is flexible enough to be able to pass from the open condition to the closed condition easily, but at the same time the closing element 302 is stably locked when it is in the open condition and is overturned.

[0195] By way of example tests were carried out with different types of caps 1 , to ascertain their opening stability, and each cap 1 was identified by means ofthe external diameter De, the sum SL equal to 305L+306L, and the ratio De / SL.

[0196] All of these examples of caps 1 demonstrated great flexibility during opening of the cap 1 but at the same time great stability in the open condition.

[0197] The left-hand column shows an internal diameter (Di) of the inner wall on which there extends a spiral of the thread structure 304 of the closing element 302 of the cap 1, which is the measurement which commonly identifies the different types of cap and corresponds to the diameter of the coupling structure 204, that is to say, of the thread structure of the neck 201. The values expressed above are shown in table 5 below.

[0198] Table 5

[0199] Cap De in mm 305L in 306L in mm SL in mm= De / SL Di in mm mm 305L+306L

[0200] 23 mm 25.6 6.6 8.0 14.6 1.75 26 mm 29.5 9.3 11.6 20.9 1.41 28 mm - cap 30.6 9.7 10.4 20.1 1.52 1

[0201] 28 mm - cap 30.5 10.3 7.4 17.7 1.72 2

[0202] 29 mm - cap 32.5 7.8 8.2 16.0 2.03 1

[0203] 29 mm - cap 31.8 7.3 6.6 13.9 2.29 2

[0204] 38 mm - cap 40.0 8.0 7.4 15.4 2.6

[0205] 1

[0206] 38 mm - cap 41.5 7.0 5.7 12.7 3.27 2

[0207]

[0208] The first tab 307 and the second tab 308 extend circumferentiallyrespectively for a third angular extent A3 and a fourth angular extent A4 and have a respective third length 307L and a respective fourth length 308L, measured circumferentially.

[0209] Now considering a total TL of the lengths of the tabs 307 and 308, obtained by adding together the third length 307L and the fourth length 308L.

[0210] TL= 307L+308L

[0211] Advantageously, a ratio of the sum SL of the lengths of the connecting bands 305, 306 to the sum TL of the lengths of the tabs 307, 308 may be greater than or equal to 0.2 and less than or equal to 2.0.

[0212] 0.2<= SL / TL <= 2.0

[0213] Preferably, that ratio may be greater than or equal to 0.5 and less than or equal to 1.5.

[0214] 0.5<= SL / TL <= 1.5

[0215] In fact, the Applicant has ascertained that the sum SL of the first length 305L and of the second length 306L of the connecting bands 305, 306, which expresses the flexibility of the cap 1 during opening, as previously described, must be appropriately balanced by a locking element which is described by the total TL of the lengths of the tabs 307, 308 and also expresses a stiffness of the cap 1 , since the tabs 307, 308 are superposed when the cap 1 is in the open condition and is overturned.

[0216] By way of example tests were carried out with the same different types of caps 1 previously identified in table 5, to ascertain their opening stability, and each cap 1 was identified by the sum SL equal to 305L+306L, the total TL equal to 307L+308L and the ratio SL / TL.

[0217] All of these examples of caps 1 demonstrated great flexibility during opening and during reclosing of the cap 1 but at the same time great stability when the cap is locked in the open condition.

[0218] Again, the left-hand column shows the internal diameter (Di) of the inner wall of the closing element 302 of the cap 1 , which is the measurement which commonly identifies the different types of cap and corresponds to the diameter of the coupling structure 204, that is to say, of the thread structureof the neck 201.

[0219] The values expressed above are shown in table 6 below.

[0220] Table 6

[0221] Cap 305L in 306L in SL in mm= TL in mm = SL / TL mm mm 305L+306L 307L+308L

[0222] 23 mm 6.6 8.0 14.6 15.3 0.95 26 mm 9.3 11.6 20.9 16.5 1.27 28 mm - 9.7 10.4 20.1 17.3 1.16 cap 1

[0223] 28 mm - 10.3 7.4 17.7 17.6 1.01 cap 2

[0224] 29 mm - 7.8 8.2 16.0 14.8 1.08 cap 1

[0225] 29 mm - 7.3 6.6 13.9 16.0 0.87 cap 2

[0226] 38 mm - 8.0 7.4 15.4 20.2 0.76 cap 1

[0227] 38 mm - 7.0 5.7 12.7 20.5 0.62 cap 2

[0228]

[0229] Both the third angular extent A3, which determines the third length 307L of the first tab 307, and the fourth angular extent A4, which determines the fourth length 308L of the second tab 308, may be greater than or equal to 10° and less than or equal to 45°; preferably greater than or equal to 15° and less than or equal to 30°.

[0230] With the angular extent values indicated above, the second tab 308 is at least partly superposed on the first tab 307, in a cap open condition, when the latter is overturned.

[0231] Both a first height H1 of the first connecting band 305, and a second height H2 of the second connecting band 306, each measured along an axisparallel to the axis Z, may be greater than or equal to 1.2 mm and less than or equal to 3.2 mm, and preferably may be greater than or equal to 1.5 mm and less than or equal to 2.8 mm.

[0232] With the height values indicated above, the first connecting band 305 and the second connecting band 306 are sturdy enough yet still flexible.

[0233] Both the first angular extent A1 , which determines the first length 305L of the first connecting band prima 305, and the second angular extent A2, which determines the second length 306L of the second connecting band 306, may be greater than or equal to 10° and less than or equal to 80°; and preferably may be greater than or equal to 15° and less than or equal to 65°. With the angular extent values A1 , A2 indicated above, the first connecting band 305 and the second connecting band 306 at the same time guarantee:

[0234] 1. A predetermined stiffness in the open condition of the cap;

[0235] 2. A predetermined flexibility to allow easy reclosing of the cap on the neck by the consumer.

[0236] A thickness T of the retaining ring 301 , measured transversally to the axis Z, may be greater than or equal to 0.5 mm and less than or equal to 1.2 mm; preferably greater than or equal to 0.7 mm and less than or equal to 1.2 mm.

[0237] It should be noticed that the above-mentioned tests, relative to stability in the open condition, were carried out with caps 1 of the type with a sharp angle, but shall also be considered valid for caps 1 ’ with rounded angles (or edges). In fact, it was ascertained that stability in the open position does not change for caps 1 with sharp angles and for caps 1 ’ with rounded angles and therefore the above-mentioned tests were not repeated.

[0238] The following should be noticed regarding the plastic material used to make the cap 1 , or T.

[0239] If PE is used, its density may range from low density to high density. In particular, it is possible to use high density polyethylene (HDPE). The high density polyethylene (HDPE) used to make the cap previously described may have the following properties:- density variable between 950 and 968 kg / m3;

[0240] - melt index variable from 0.3 to 20 g, in the following measuring conditions: 10 minutes, 190°C, 2.16 kg;

[0241] - molecular weight distribution wide, or narrow, or unimodal, or multimodal. If PP, polypropylene, is used, that material may be in the form of a homopolymer, or heterophasic copolymer, or even statistical copolymer. The melt index of PP may vary from 2 to 20 g, in the following measuring conditions: 10 minutes, 230°C, 2.16 kg.

[0242] Advantageously, however, for the cap 1 , or T, it is possible to use PET. For example, the same PET may be used as is used to make bottles with intrinsic viscosity of between 0.7 and 1.15 dl / g, preferably between 0.74 and 0.86 dl / g.

[0243] The density of the PET granule is between 1300 and 1400 kg / mA3, preferably between 1325 and 1385 kg / mA3.

[0244] This invention is advantageously applicable to a cap 1 , or T, which is suitable for being used, for example, on necks 201 in the following list, each neck 201 of the container 2 being associated with a respective code which identifies the name of the neck 201 , the diameter of the outer surface of the neck 201 , and the diameter of the supply opening 203 of the neck 201 , in accordance with the nomenclature of CETIE (www.cetje.Qrg) or ISBT

[0245]

[0246]

[0247] For each code, if the neck 201 is also a European standard, the reference number is also provided.

[0248] The specifications described below apply for the cap 1 , or T, according to this invention and for the neck 201 already known.

[0249] GME30.3925 / 22 mm

[0250] GME30.2826 / 22 mm DIN EN 16594:2016

[0251] GME30.3826 / 22 mm

[0252] GME30.3726 / 22 mm

[0253] GME30.4026 / 22 mm

[0254] GME30.2427 / 22 mm EN 16067:2012PCO1881 28 / 22 mm

[0255] PCO181028 / 22 mm

[0256] GME30.2629 / 25 mm EN 16592:2015

[0257] GME30.21 30 / 25 mm EN 16064:2012

[0258] GME30.31 32 / 26 mm

[0259] GME30.3632 / 27 mm

[0260] GME30.3033 / 28 mm

[0261] GME30.2538 / 33 mm

[0262] GME30.2938 / 32 mm

[0263] As regards the type of beverage which can be contained in the container 2, it should be noticed that this invention is particularly applicable to a cap 1 , or 1 which is suitable for use for beverages on the following list: carbonated beverage up to 11 g / l of CO2;

[0264] carbonated beverage up to 9 g / l of CO2;

[0265] carbonated beverage up to 7 g / l of CO2;

[0266] non-carbonated beverage, for example still water;

[0267] pressurised beverage, for example due to the presence of N2 (nitrogen) in a head space of the container with overpressure of up to 1.5 bar, preferably up to 1 bar;

[0268] beverage sensitive to oxidative degradation, or beverage sensitive to microbial degradation;

[0269] (if the cap 1 , or 1 ’, is made of PET) cold filled beverages (<35°C); hot filled beverages <65°C;

[0270] (general note: this correction is valid only if the cap is made of PET, not in general, in the other cases the previous temperature range remains) (if the cap 1 , or T, is not made of PET but instead of PE, or HDPE, or PP) cold filled beverages (<35°C); hot filled beverages <95°C, preferably 70<Tf (Filling temperature) <89°C.

[0271] As regards the transversal wall 4 of the cap 1 , or T, it should be noticed that this invention is particularly applicable to a cap 1 , or T, in which the transversal wall 4:may be flat, or concave, or may have an outer annular zone, flat or concave, at a first distance from the free edge and a central zone, flat or concave, at a second distance from the free edge, the second distance being greater than the first distance, to define a raised space;

[0272] it may optionally have internal logos, or external logos;

[0273] it may have a smooth or rough outer surface, as defined in accordance with standard ISO1302, for example between NO and N10, preferably between N4 and N9;

[0274] it may have a thickness of between 0.4 mm and 2 mm;

[0275] it may have an inner surface provided with a reinforcing ribbing, where the reinforcing ribbing can be made using spokes, or concentric rings, or a combination thereof.

[0276] As regards the lateral wall 3, it may be provided with knurling lines 312. With reference to those knurling lines 312, it should be noticed that this invention is particularly applicable to a cap 1 , or 1’, in which the knurling lines:

[0277] may be angularly equally spaced apart from each other, numbering between 30 and 144, preferably between 60 and 120;

[0278] they may be grouped and each group may be separated from the adjacent group by a space without a knurling line, for example there may be 24 groups present, in which each group has 3 knurling lines which are equally spaced apart from each other;

[0279] there may be service knurling lines present, with reduced length, used to guide the cap during a cutting operation;

[0280] may be present on the lateral wall and optionally on the transversal wall and / or on the retaining ring.

[0281] As regards the lateral wall 3, it should be noticed that this invention is particularly applicable to a cap 1 , or 1 ’, in which the lateral wall 3 may have: a constant thickness, for example between 0.35 and 1.2 mm; or

[0282] may have an uneven thickness, which is for example greater towards the free edge 303 of the lateral wall 3; or it may have a smooth or rough innersurface, as defined in accordance with standard ISO1302, for example between NO and N10, preferably between N4 and N9; however, preferably the sealing surfaces of the cap and neck are smooth, polished.

[0283] As regards the inner coupling structure 304 of the cup-shaped body, which is configured to removably couple the cup-shaped body to the neck 201 of the container 2, it should be noticed that this invention is particularly applicable to a cap 1 , or 1’, in which the inner coupling structure 304 is a thread structure and may have:

[0284] a thread structure with single helical thread with angular extent between 500° and 930°, preferably between 650° and 760°, in which the thread optionally has a plurality of interruptions numbering between 4 and 30; a thread structure with a plurality of helical threads, that is to say, with multiple helical threads, for example with two helical threads or with three helical threads, wherein each thread has an angular extent between 90° and 380°, preferably between 120° and 250°, wherein each thread optionally has a plurality of interruptions numbering between 2 and 15, for example the coupling structure may comprise two helical threads or three helical threads.

[0285] The interruptions of each thread, in the thread structures described above, are preferential escape routes for the gas which may be present inside the container. It should be noticed that this invention is particularly applicable to a cap 1, or T, in which the interruptions may be made exclusively on the thread, or may be dug in the lateral wall 3 of the cap 1 , or T, to guarantee greater depth for the interruption and therefore to increase a passage for the gas which may be present in the container.

[0286] As regards the production method, it should be noticed that the cup-shaped body of the cap 1 , or T, may be made as a concave body obtained by means of injection moulding, or compression moulding, or injection compression moulding.

[0287] The breakable bridges and / or the breakable elements may be made using special moulds during moulding of the cap 1 , or T, or by means of a cuttingoperation, after the concave body has been made.

[0288] The retaining ring 301 has an engaging element 309, which is configured to engage with a locking ring of the neck 201 of the container in such a way as to allow separation of the closing element 302 from the retaining ring 301 , promoting breaking of the breakable bridges, when the cap 1 , or T, is opened for the first time.

[0289] It should be noticed that this invention is particularly applicable to a cap 1 , or T, in which the engaging element 309 may be shaped like a flap, which projects inwards towards the inside of the cap 1 , or T, starting from its initial end and may be placed on a free edge 303, or near the free edge 303. Along the initial end of the engaging element 309 there may be a plurality of drainage openings present, which have a small angular extent, are equally spaced apart from each other and serve to drain any washing liquid after moulding of the cap 1 , or T. The number of drainage openings may be between 3 and 30, preferably between 5 and 16.

[0290] The engaging element 309 preferably has a retaining portion suitable for keeping the retaining ring 301 associated with the neck 201. For that purpose, the retaining portion is delimited by a contact surface suitable for abutting against the locking ring of the neck 201. The contact surface is in particular suitable for abutting against the lower wall of the locking ring. In use, the first time the cap 1 , or T, is unscrewed, the contact surface abuts against the locking ring, causing the contact surface to stop, creating a tension on the breakable bridges which break.

[0291] The engaging element 309 may also comprise a centring portion, which from the retaining portion projects towards the transversal wall 4. The centring portion is suitable for engaging with the neck 201 , in particular with the locking ring 202, before the closing element 302 is separated from the retaining ring 301 by breaking the breakable bridges. The centring portion has a centring function, since it allows the retaining portion to be kept centred relative to the neck 201 before the closing element 302 is opened for the first time.The centring portion also has an anti-tipping function because it prevents the retaining portion from “tipping over”, that is to say, from rotating towards the neck 201.

[0292] If that were to occur, when the closing element 302 is unscrewed for the first time, the retaining portion could inadequately engage with the neck 201 , for example without abutting against the lower wall, and consequently breakage of the breakable bridges would not be guaranteed.

[0293] In other words, the centring portion engages with the outer edge of the locking ring and obstructs its rotation around the axis Z.

[0294] It should be noticed that this invention is particularly applicable to a cap 1 , or T, in which, alternatively and according to an embodiment not shown in these figures, the engaging element may not be shaped like a flap, instead being an enlarged element which projects inwards towards the inside of the cap 1 , or T:

[0295] which may be continuous;

[0296] which may be interrupted and having a plurality of portions angularly equally spaced apart from each other, numbering from 3 to 15;

[0297] which may have a flexibility recess adjacent to it, on the transversal wall 4 side, in which the lateral wall 3 has a reduced cross-section;

[0298] which may have a further enlarged element continuing on from it which projects less than the enlarged element and is positioned, when the cap 1, or 1 ’, is coupled to the neck 201 , at the locking ring of the neck 201.

[0299] It should be noticed that this invention is particularly applicable to a container 2 which may be obtained by injection and stretch-blow moulding, or by injection and blow moulding, or by extrusion and blow moulding or by compression and blow moulding.

[0300] If the container 2 is a bottle, not illustrated, which comprises the neck 201 and a containment body provided with a resting bottom, wherein the containment body is connected to the neck 201 by a shoulder, it should be noticed that this invention is particularly applicable to a container 2 wherein, alternatively and according to an embodiment not shown in these figures,the shoulder may be

[0301] conical;

[0302] concave (“flask-style");

[0303] convex;

[0304] round; and wherein the containment body, according to an embodiment not shown in these figures may be:

[0305] with round cross-section;

[0306] with rectangular cross-section with rounded, or smoothed edges; with square cross-section with rounded, or smoothed edges; completely smooth on the outside;

[0307] decorated on the outside;

[0308] ribbed on the outside.

[0309] If the containment body has outer ribs, not shown in these figures, these ribs may be:

[0310] straight, or undulating; continuous, or interrupted, and may have a crosssection that is square, or circular, or has a different dedicated shape.

[0311] It should be noticed that this invention is particularly applicable to a container 2 in which, alternatively and according to an embodiment not shown in these figures, the resting bottom may be:

[0312] flat, and may have a plurality of shapes which derive from the number and the position of the outer ribs which, positioned like radial spokes starting from a central zone of the resting bottom, at least partly extend upwards on the outside of the containment body of the container;

[0313] concave, like a champagne bottom;

[0314] having a plurality of resting projections, called petals, their number being greater than or equal to 3 and less than or equal to 7; preferably their number being greater than or equal to 4 and less than or equal to 6, wherein each resting projection may be divided in half in a resting part, configured to rest on the supporting surface, by means of a rib with small dimensions in order to increase the mechanical strength of the rib itself.

[0315] From what is described above it can therefore be seen how this inventionachieves the purpose and the aims proposed and in particular it should be emphasised that a closing cap 1 ’ for a container 2 is made, in accordance with this invention, which has only the first tab 307 and the second tab 308, positioned one after the other along a circumferential line of extension, both acting as a support for the closing element 302 in the open condition, wherein what is guaranteed for the first connecting band 305 and / or for the second connecting band 306 is a sturdiness providing resistance to breaking if pulled which is approximately 10%, and even more than 10%, and a greater resistance to twisting (such that it guarantees a number of opening and / or closing cycles of the cap 1 ’ greater than or equal to 15), than a cap 1 which has angular zones with angles (or edges) which are sharp, that is to say, not rounded, or are rounded but whose respective radii are not within the range indicated above.

Claims

CLAIMS1. A closing cap (1’) for a container (2), comprising a lateral wall (3) extending around an axis (Z) and a transversal wall (4) positioned at one end of the lateral wall (3), a first separating line (5’) and a second separating line (6’) being provided on the lateral wall (3) to define:a retaining ring (301), which is configured to remain anchored to a neck (201 ) of the container (2) and extends as far as a free edge (303); a closing element (302) removably engageable with the neck (201), so as to open or close the container (2);wherein the first separating line (5’) and the second separating line (6’) do not intersect and are configured in such a way as to define:- a first connecting band (305) and a second connecting band (306) which, during a step of opening the cap (1 ’) from the container (2), keep the closing element (302) and the retaining ring (301) joined to each other;- a first tab (307), which is part of the retaining ring (301), and a second tab (308), which is part of the closing element (302), which are circumferentially interposed between the first connecting band (305) and the second connecting band (306) and are configured in such a way that, in a cap (1’) open condition, when the cap (1’) is overturned, the second tab (308) is at least partly superposed on the first tab (307); and wherein- the first separating line (5’) comprises a first plurality of stretches (701, 703, 711 , 712) which comprises a first group of stretches (701 , 703, 712) which are planar, and a second group of stretches (711) which are inclined; and wherein- the second separating line (6’) comprises a second plurality of stretches (702, 704, 705, 706, 707, 708, 709) which comprises a first set of stretches (702, 704, 708, 709) which are planar, and a second set of stretches (705, 706, 707) which are inclined; and wherein- a first angular zone (801 ) and a second angular zone (802) delimit the first connecting band (305) on a side directed towards the first tab (307);- a third angular zone (803) and a fourth angular zone (804) delimit thesecond connecting band (306) on a side directed towards the second tab (308); the first angular zone (801 ), the second angular zone (802), the third angular zone (803) and the fourth angular zone (804) each being defined between two respective adjacent stretches of the second separating line (6’), wherein one stretch is selected in the first set of stretches (702, 704, 708, 709) and the further stretch is selected in the second set of stretches (705, 706, 707); and wherein- a fifth angular zone (805) and a sixth angular zone (806) delimit the second connecting band (306) on an opposite side, relative to the second tab (308); the fifth angular zone (805) and the sixth angular zone (806) each being defined between two respective adjacent stretches of the first separating line (5’), wherein one stretch is selected in the first group of stretches (701 , 703, 712) and the further stretch is selected in the second group of stretches (710); and wherein- at least one angular zone, of the first angular zone (801), the second angular zone (802), the third angular zone (803), the fourth angular zone (804), the fifth angular zone (805) or the sixth angular zone (806) is rounded and is defined by a respective radius which is between 0.5 and 4 mm, preferably between 1 and 2 mm.

2. The closing cap (T) according to claim 1 , wherein the first angular zone (801), the second angular zone (802), the third angular zone (803), the fourth angular zone (804), the fifth angular zone (805) and the sixth angular zone (806) are all rounded and are respectively defined by a first radius (R1), a second radius (R2) a third radius (R3), a fourth radius (R4), a fifth radius (R5) and a sixth radius (R6), and wherein at least one radius selected from the first radius (R1), the second radius (R2), the third radius (R3), the fourth radius (R4), the fifth radius (R5), and the sixth radius (R6) is between 0.5 and 4 mm, preferably between 1 and 2 mm.

3. The closing cap (1 ’) according to claim 2, wherein each of the above-mentioned radii selected from the first radius (R1), the second radius (R2), the third radius (R3), the fourth radius (R4), the fifth radius (R5), the sixthradius (R6) is between 0.5 and 4 mm, preferably between 1 and 2 mm.

4. The closing cap (1 ’) according to claim 2, or 3, wherein a seventh angular zone (807) and an eighth angular zone (808) respectively delimit the first tab (307) on the second tab (308) side, and the second tab (308) on the first tab (307) side; the seventh angular zone (807) and the eighth angular zone (808) being defined between two respective adjacent stretches of the second separating line (6’), wherein one stretch is selected in the first set of stretches (702, 704, 708, 709) and the further stretch is selected in the second set of stretches (705, 706, 707); and wherein at least one angular zone selected from the seventh angular zone (807) and the eighth angular zone (808) is rounded and is defined by a respective radius which is between 0.5 and 4 mm, preferably between 1 and 2 mm.

5. The closing cap (T) according to claim 4, wherein the seventh angular zone (807) and the eighth angular zone (808) are rounded and respectively have a seventh radius (R7) and an eighth radius (R8), and wherein at least one radius selected from the seventh radius (R7) and the eighth radius (R8), is between 0.5 and 4 mm, preferably between 1 and 2 mm.

6. The closing cap (1 ’) according to claim 5, wherein the seventh radius (R7) and the eighth radius (R8) are both between 0.5 and 4 mm, preferably between 1 and 2 mm.

7. The closing cap (1 ’) according to one of claims 4 to 6, wherein the seventh radius (R7) and / or the eighth radius (R8) is greater than any radius selected from the first radius (R1), the second radius (R2), the third radius (R3), the fourth radius (R4), the fifth radius (R5) and the sixth radius (R6).

8. The closing cap (T) according to one of the preceding claims, wherein -the first connecting band (305) is made between a first stretch (701) of the first separating line (5’), which belongs to the first group, and a second stretch (702) of the second separating line (6’), which belongs to the first set,- the second connecting band (306) is made between a third stretch (703) of the first separating line (5’), which belongs to the first group, and a fourthstretch (704) of the second separating line (6’), which belongs to the first set;- the first tab (307) is made between a fifth stretch (705) and a sixth stretch (706) of the second separating line (6’), which belong to the second set and has a respective first end (307A) which is formed by an eighth stretch (708) of the second separating line (6’), the eighth stretch (708) connecting the fifth stretch 705 and the sixth stretch (706) to each other and belonging to the first set; and wherein- the first angular zone (801 ), defined between the second stretch (702) and the fifth stretch (705), is rounded, and / or the second angular zone (802), defined between the fifth stretch (705) and the eighth stretch (708), is rounded.

9. The closing cap (T) according to claim 8, and wherein the second tab (308) is made between the sixth stretch (706) and a seventh stretch (707) of the second separating line (6’), which belong to the second set, and has a respective second end (308A) which is formed by a ninth stretch (709) of the second separating line (6’), the ninth stretch (709) connecting the sixth stretch (706) and the seventh stretch (707) to each other and belonging to the first set; and wherein- the third angular zone (803), defined between the ninth stretch (709) and the seventh stretch (707), is rounded; and / or the fourth angular zone (804), defined between the seventh stretch (707) and the fourth stretch (704), is rounded.

10. The closing cap (T) according to claim 8, or 9, wherein the first separating line (5’) comprises an eleventh stretch (711), which belongs to the second group and has a first end connected to the third stretch (703) and a second end connected to a joining stretch 712, which belongs to the first group and is connected to the first stretch (701); and wherein the fifth angular zone (805), defined between the third stretch (703) and the eleventh stretch (711), is rounded; and / or the sixth angular zone (706), defined between the eleventh stretch (711) and the joining stretch (712), is rounded.

11. The closing cap (T) according to claim 9, or 10, when claim 10 is dependent on claim 9, wherein the first stretch (701 ), the fourth stretch (704) and the eighth stretch (708) lie in a first plane, the second stretch (702), the third stretch (703), the ninth stretch (709) lie in a second plane, and wherein the first plane and the second plane are parallel to each other.

12. The closing cap (1 ’) according to one of claims 9 to 11 , when they are dependent on claim 4, wherein the seventh angular zone (807), defined between the ninth stretch (709) and the sixth stretch (706), is rounded; and / or the eighth angular zone (808), defined between the sixth stretch (706) and the eighth stretch (708) is rounded.

13. The closing cap (T) according to one of claims 8 to 12, wherein the first separating line (5’) comprises a tenth stretch (710), which belongs to the second group, and wherein the first connecting band (305) is circumferentially delimited by the fifth stretch (705) of the second separating line (6’) on one side and by the tenth stretch (710) on the other side, wherein the tenth stretch (710) has one end connected to the first stretch (701) and a further free end, which is connected to neither the first separating line (5’), nor the second separating line (6’).

14. The closing cap (1 ’) according to claim 13, wherein a ninth angular zone (809) delimits the first connecting band (307) on the opposite side to that of the first tab (307) and is rounded, the ninth angular zone (809) being between the first stretch (701) and the tenth stretch (710) of the first separating line.

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