lids for containers

Abstract

A lid for a container includes: an end wall (4); a skirt (2) extending about an axis (Z); and a corner section (5) between the end wall (4) and the skirt (2). The corner section (5) includes: a first wall portion (6) extending from the skirt (2) toward the interior of the lid (1); and a second wall portion (7) projecting from the end wall (4) and engaging with the first wall portion (6). The first wall portion (6) and the second wall portion (7) define a stepped portion on the surface of the corner section (5) facing the exterior of the lid (1; 101). The lid (1) also includes an annular sealing lip (8) extending from the area where the first wall portion (6) and the second wall portion (7) engage toward a free edge (30) of the skirt (2). The annular sealing lip (8) is defined by an inner surface (9) configured to engage with an outer surface of the neck (31) of the container.

Description

Technical Field

[0001] This invention relates to a lid for containers, specifically one that can be obtained by molding a polymer material. The lid according to the invention is particularly suitable for sealing containers such as bottles, especially those intended to contain carbonated beverages (e.g., beverages in which carbon dioxide has been added), but the lid can also be used to seal bottles containing other types of liquids (e.g., liquids without carbon dioxide or liquids pressurized with nitrogen (N2), or for sealing other containers. Background Technology

[0002] Known lids for containers include columnar sidewalls or skirts, with one or more anchoring elements (e.g., threads) formed on the inner surface of the columnar sidewalls or skirts to allow the lid to be removably fastened to the neck of the container. Prior art lids also include a flat upper wall having a generally circular shape when viewed in plan view, from which the columnar sidewalls extend.

[0003] One or more sealing lips may extend from the flat upper wall, and one or more sealing lips extend toward the inside of the lid and are designed to engage with the neck of the container, thereby preventing substances from the inside of the container to the outside, and vice versa.

[0004] The desired outcome is that the lid used for the container has sufficient rigidity to maintain a good seal even if deformation may occur during the service life of the container sealed by the lid. More specifically, relatively high pressures may arise inside the container, for example, due to exposure to relatively high temperatures or due to accidental deformation and compression.

[0005] It is also expected that the lid will maintain good sealing properties, that is, prevent the contents of the container from escaping and prevent foreign substances from the external environment from entering the container.

[0006] Finally, in recent years, there has been a growing sense of need to reduce the consumption of synthetic polymer materials used in the manufacture of covers, for reasons related to environmental protection and pollution reduction.

[0007] Examples of prior art covers are disclosed in WO 2017 / 139902, JP 2013-129430, US 2015 / 129534, and EP 0076778. Summary of the Invention

[0008] The object of the present invention is to improve a lid for a container, specifically, but not exclusively, a lid designed to seal a container in which a gaseous substance is present.

[0009] Another objective is to provide a lid for containers with good structural rigidity.

[0010] Another objective is to provide a lid for a container that can seal the container in a nearly airtight manner.

[0011] Another objective is to provide a cap made of polymer material that consumes less polymer material compared to caps of the prior art.

[0012] According to the present invention, a lid for a container is provided, the lid comprising: an end wall; a skirt extending about an axis; and a corner section between the end wall and the skirt, the corner section comprising a first wall portion and a second wall portion, the first wall portion extending from the skirt toward the interior of the lid, the second wall portion protruding from the end wall and engaging with the first wall portion, wherein the lid further comprises an annular sealing lip extending from the area where the first wall portion and the second wall portion engage toward a free edge of the skirt.

[0013] The annular sealing lip is adapted to engage with the neck of the container during use by contacting the outer surface of the neck to apply a seal between the annular sealing lip of the cap and the outer surface of the neck.

[0014] Therefore, the annular sealing lip gives the cap good sealing properties because it can engage with the outer surface of the neck not only when the cap is not deformed, but also when the cap is deformed (e.g., due to relatively high pressure inside the container).

[0015] The first and second wall portions define a stepped section on the outer surface of the corner section.

[0016] The stepped section eliminates the need for material in the connection section between the end wall and the skirt, thus ensuring savings in polymer material compared to the case where the end wall and skirt are joined along the entire corner.

[0017] In one embodiment, the edge segment may have multiple outer ribs.

[0018] The outer ribs may be arranged along the stepped portion defined by the first wall portion and the second wall portion.

[0019] External ribs (if present) ensure good rigidity of the cover and prevent excessive deformation. Attached Figure Description

[0020] The invention can be better understood and practiced with reference to the accompanying drawings, which illustrate non-limiting exemplary versions of the invention, in which:

[0021] Figure 1 It is a cross-sectional view of a lid used to close a container, taken on a vertical plane including the axis of the lid;

[0022] Figure 2 yes Figure 1Enlarged view of the corner section of the cover;

[0023] Figure 3 Is with Figure 1 A three-dimensional image of a lid similar to the one shown.

[0024] Figure 4 Is with Figure 1 A similar view shows the cover according to an alternative embodiment;

[0025] Figure 5 This is a cross-sectional view of the container's neck. Figure 1 or Figure 4 The cap can be applied to the neck;

[0026] Figure 6 Is with Figure 1 A similar cross-sectional view shows a portion of the lid when it is applied to the neck of the container under normal operating conditions;

[0027] Figure 7 Is with Figure 1 A similar cross-sectional diagram shows a situation where the pressure inside the container is greater than atmospheric pressure. Detailed Implementation

[0028] Figure 1 A cap 1 is shown that is adapted to be removably attached to a container to close the open end of the container. The container that can be closed by the cap 1 can be a bottle designed to hold liquids such as carbonated beverages, or a bottle designed to hold non-carbonated liquids, or another type of container.

[0029] The cover 1 is made of polymer material, for example by molding. Specifically, the cover 1 can be made by injection molding or compression molding, but other manufacturing techniques are not excluded.

[0030] The cover 1 includes a sidewall or skirt 2 extending around axis Z. According to the example shown, the skirt 2 is generally columnar.

[0031] When the cap 1 is applied to the neck of the container, the skirt 2 is generally vertical.

[0032] One or more anchoring elements 3 are provided on the inner surface of the skirt 2, which allow the cap 1 to be removably secured to the neck of the container to close the container. According to the example shown, the anchoring element 3 includes a plurality of threaded portions adapted to engage with corresponding threads on the neck of the container.

[0033] According to an alternative embodiment not shown, the anchoring element 3 may have the same characteristics as... Figure 1 The threaded portions shown have different shapes. For example, anchoring element 3 may include a flange or a cam element.

[0034] The cover 1 also includes an end wall 41 positioned transversely to (particularly perpendicular to) axis Z. The end wall 4 is generally flat and has a generally circular shape in plan view.

[0035] End wall 4 closes skirt 2 at one end. At the opposite end of skirt 2, opposite to the end closed by end wall 4, skirt 2 has a free edge 30.

[0036] When the cap 1 is applied to the neck of the container, the end wall 4 is located at a height higher than the skirt 2 to close the open upper end of the container. Therefore, the end wall 4 can be defined as the upper wall of the cap 1, with the adjective "upper" referring to the position of the end wall 4 during use.

[0037] Corner section 5 is located between skirt 2 and end wall 4. Corner section 5 is... Figure 2 The magnified portion is shown in detail.

[0038] The corner section 5 includes a first wall portion 6 extending from the skirt 2 toward the interior of the cover 1. The first wall portion 6 extends about an axis Z. The first wall portion 6 is laterally positioned relative to the axis Z. The first wall portion 6 extends from the upper edge section of the skirt 2 toward the interior of the cover 1 (i.e., toward the axis Z).

[0039] The first wall section 6 is inclined relative to the skirt section 2.

[0040] The overall shape of the first wall section 6 resembles a truncated cone or a roughly flat circular crown and is coaxial with the axis Z.

[0041] The corner section 5 also includes a second wall portion 7 located between the first wall portion 6 and the end wall 4. More specifically, the second wall portion 7 connects the first wall portion 6 to the outer peripheral edge of the end wall 4.

[0042] In addition, the second wall portion 7 extends around axis Z.

[0043] The second wall portion 7 has a different inclination than the first wall portion 6. Specifically, the second wall portion 7 may be less inclined than the first wall portion 6, i.e., arranged in a configuration closer to a vertical structure. The adjective "vertical" as used here refers to the position adopted when the cover is applied to a container, wherein the axis Z is approximately vertical and the end wall 4 is located at a height higher than the skirt 2.

[0044] According to the example shown, the second wall section 7 is approximately vertical.

[0045] The first wall portion 6 may have a thickness that decreases from the skirt portion 2 toward the second wall portion 7, or it may have a substantially constant thickness.

[0046] The first wall portion 6 and the second wall portion 7, which have different inclinations, define a stepped portion in the corner section 5, and in particular, the stepped portion is defined on the outer surface of the corner section 5.

[0047] The term "stepped section" does not mean that the first wall portion 6 and the second wall portion 7 are approximately perpendicular to each other, for example, as shown in the image. Figure 2 As shown in the image.

[0048] In a cross-sectional view taken on a plane containing axis Z, the first wall portion 6 extends transversely to the second wall portion 7.

[0049] The cap 1 includes an annular sealing lip 8 extending toward a free edge 30 from the region where the first wall portion 6 and the second wall portion 7 meet. The annular sealing lip 8 protrudes toward at least one anchoring element 3 inside the cap 1 to engage with the neck of the container on which the cap 1 is applied, as described in more detail below.

[0050] The annular sealing lip 8 extends about axis Z. More specifically, in the example shown, the annular sealing lip 8 extends primarily parallel to axis Z. If the cover 1 is as follows... Figure 1 If the position shown is such that the axis Z is vertically positioned, then the annular sealing lip 8 extends mainly vertically.

[0051] The annular sealing lip 8 extends toward the interior of the cover 1, just like the continuation of the second wall portion 7. The annular sealing lip 8 is defined by an inner surface 9, which defines an uninterrupted continuation of the inner surface 10 of the second wall portion 7 that defines the interior of the cover 1.

[0052] The annular sealing lip 8 protrudes toward the free edge 30 relative to the first wall portion 6.

[0053] The annular sealing lip 8 has a thickness that decreases toward the free edge 30.

[0054] Optionally, the inner surface 9 defining the annular sealing lip 8 is a curved surface, for example, having an inner diameter that increases in the direction oriented from the end wall 4 toward the free edge 30.

[0055] Furthermore, the annular sealing lip 8 is defined by an outer surface 11, which may, for example, have a cylindrical shape or a truncated conical shape coaxial with the axis Z.

[0056] exist Figure 1 In one example, the annular sealing lip 8 has: a base portion 16, positioned closer to the second wall portion 7 and having a substantially constant thickness; and an end portion 17, positioned further away from the second wall portion 7 and having a thickness that decreases toward the free edge 30.

[0057] The inner surface 9 of the annular sealing lip 8 is adapted to engage with the outer surface of the neck of the container to apply a seal when in contact with the neck of the container.

[0058] The cover 1 may include a plurality of outer ribs 12 disposed in a corner section 5 outside the first wall portion 6 and the second wall portion 7. Each outer rib 12 connects the first wall portion 6 to the second wall portion 7.

[0059] The outer ribs 12 have a generally flat shape. Each outer rib 12 extends primarily in a plane containing the axis Z. The outer ribs 12 are thus radial ribs.

[0060] The outer rib 12 has a rounded outer contour.

[0061] The thickness of the outer rib 12 is substantially constant between ribs and along a single rib.

[0062] The outer ribs 12 can be spaced at equal angles.

[0063] The outer rib 12 protrudes outward from the stepped portion defined between the first wall portion 6 and the second wall portion 7.

[0064] The recess 13 is located between two consecutive outer ribs 12.

[0065] Each recess 13 is defined by a first wall portion 6, a second wall portion 7, and two outer ribs 12 between the recesses.

[0066] Therefore, the corner section 5 of the cover 1 can have multiple recesses 13, which can be distributed around the axis Z at equal angular intervals.

[0067] The recess 13 may have an angular extension about axis Z, which is equal between one recess 13 and another recess.

[0068] The outer rib 12 is optional. According to one embodiment not shown, the outer rib 12 may be absent.

[0069] The cap 1 may also be provided with an internal sealing element 14, which has an annular shape and extends from the end wall 4 toward the interior of the cap 1 (more particularly toward the free edge 30). The internal sealing element 14 is adapted to be inserted into the neck of the container to seal against the inner surface of the neck. Specifically, the internal sealing element 14 may be defined by a convex sealing surface 15 for contacting the inner surface of the neck of the container.

[0070] The internal sealing element 14 is located inside the annular sealing lip 8, that is, the average diameter of the internal sealing element is smaller than the average diameter of the annular sealing lip 8.

[0071] The height H1 of the inner sealing element 14 is greater than that of the annular sealing element 8. This means that the free end 18 of the inner sealing element 14 is closer to the free edge 30 than the end 19 of the annular sealing lip 8.

[0072] The cover 1 may include a front sealing element 20, which is shaped as an annular protrusion extending from the end wall 4 toward the interior of the cover 1. The front sealing element 20 is located between the annular sealing lip 8 and the inner sealing element 14. That is, the average diameter of the front sealing element 20 is smaller than the average diameter of the annular sealing lip 8 but larger than the average diameter of the inner sealing element 14.

[0073] The front sealing element 20 is shorter than the annular sealing lip 8 and the inner sealing element 14 so as to align with the upper edge 39 of the container neck (e.g., Figure 5 (As shown in the diagram) engagement.

[0074] In one embodiment, the front sealing element 20 may be omitted.

[0075] The outer surface of the skirt 2 may have knurling lines 21, which makes it easier to apply the cap 1 to the container in an automated capping production line, and makes it easier for the user to hold the cap 1 when it needs to be removed from the container or applied to the container.

[0076] The knurling 21 can have a shape with rows of protrusions extending from the outer surface of the skirt 2 and parallel to the axis Z.

[0077] like Figure 3 As shown, the knurled lines 21 can be further grouped, with adjacent groups of knurled lines 21 separated by a smooth portion 22 (i.e., without knurling) on ​​the outer surface of the skirt 2. Figure 3 In the example, multiple sets of knurled lines 21 are formed by three knurled lines 21.

[0078] Alternatively, the knurled lines 21 can be distributed in other arrangements, such as being equidistant around axis Z.

[0079] The knurled line 21 may extend entirely or partially along the continuation of the skirt 2 as part of the outer rib 12. In the case where the knurled line extends as part of the outer rib along the continuation of the skirt (e.g.) Figure 2 As shown in the diagram, the outer rib 12 extending from the knurled line 21 can extend further toward the outside of the cover 1 compared to the other outer ribs 12.

[0080] In addition, at least one dividing line 23 can be provided on the skirt 2 (e.g. Figure 1As shown in the diagram, a breakable line is provided along which the material of the lid 1 can break when the container sealed by the lid 1 is first opened. A dividing line 23 defines an tamper-evident ring 24 and a closure element 25 on the lid 1. The tamper-evident ring 24 is located between the dividing line 23 and the free edge 30 and is adapted to remain anchored to the neck of the container after it has been opened. The closure element includes an end wall 4 and a portion of the skirt 2 between the end wall 4 and the dividing line 23. The closure element 25 can be removed from the container to access its contents, or alternatively, the closure element can be reapplied to the container. The dividing line 23 may be defined by a plurality of cuts, with corresponding bridging elements located between these cuts. The bridging elements are adapted to break upon first removal of the closure element 25 from the container, thus indicating that the container has been opened.

[0081] Alternatively, the dividing line 23 may be defined by one or more thinner thickness portions, in which the material forming the cover 1 is thinner than the rest of the skirt 2.

[0082] The dividing line 2 can be implemented in different ways, such as performing the cutting operation after the cover 1 is formed, or performing the cutting operation directly during the forming process.

[0083] The tamper-evident ring 24 may include an annular band 26 defined by a dividing line 23 and extending to a free edge 30. The tamper-evident ring 24 may also include a retaining element 27 adapted to engage with the neck of the container to prevent removal of the tamper-evident ring 24 from the container upon initial opening. According to the illustrated example, the retaining element 27 includes a flap that connects to the annular band 26 at the free edge 30 and folds upward into the cap 1 to be surrounded by the annular band 26. The retaining element 27 is adapted to interact with an annular protrusion located outside the neck of the container.

[0084] The retaining element 27 can also be shaped to be with Figure 1 The retaining elements shown are different. For example, retaining element 27 may include a plurality of protrusions folded toward the interior of cover 1, or a plurality of flanges extending from the inner surface of annular band 26 toward the interior of cover 1.

[0085] Cover 1 may have one or more exhaust channels 28. Figure 1 An exhaust passage 28 is shown. The exhaust passage 28 is designed to allow any pressurized gas present inside the container to escape in a controlled and gradual manner when the sealing element 25 is removed from the container, for example, by unscrewing it. The exhaust passage 28 may be shaped similarly to an axial groove extending parallel to axis Z, at which the anchoring element 13 is interrupted.

[0086] Figure 1The exhaust passage 28 is shown to interrupt all anchoring elements 13, which are positioned at an angle (around axis Z) where the exhaust passage 28 is located.

[0087] As an alternative to the exhaust passage 28 of the above type, or in addition to the exhaust passage 28, one or more partial interruption sections 29 may be provided, such as... Figure 1 The anchoring element 13 is only partially interrupted, as shown in the diagram. Figure 1 In this example, the partial interruption section 29 interrupts only the portion of the thread closest to the tamper-evident ring 25, without altering the other portions of the thread closer to the end wall 4.

[0088] The partial interruption section 29 has an exhaust function, that is, the partial interruption section allows gas that may be present in the container to escape, but in a more limited manner compared to the exhaust channel 28.

[0089] The partial interruption 29 can be located at a corresponding angled position around the axis Z, which is different from the angled position of the exhaust passage 28.

[0090] Cover 1 is intended to be as Figure 6 The area shown is applied to the neck 31 of the container.

[0091] Neck 31 (in) Figure 5 (As can also be seen in the image) may include a fastening arrangement 34 adapted to allow the closure element 25 of the cover 1 to be fastened to the neck 31 or to remove the closure element from the neck. The fastening arrangement 34 may include one or more external threads formed on the neck 31 and adapted to engage with the anchoring element 13 of the cover 1.

[0092] like Figure 5 As shown, the neck 31 may also include an annular element 32 extending outward from the neck 31 and capable of performing multiple functions. For example, the annular element 32 may be used during container production and during container transport. Furthermore, the annular element 32 serves as a stop element for the tamper-evident ring 24, as it can prevent the tamper-evident ring 24 from falling down the neck 31 below the annular element 32 after the sealing element 25 has detached from it.

[0093] An annular enlargement 33 is located between the annular element 32 and the fixed arrangement 34. The annular enlargement 33 extends outward from the neck 31 and is adapted to engage with the retaining element 27 of the tamper-evident ring 24, as described in more detail below.

[0094] When in use, fill the container with liquid or other desired substance, and then apply the cap 1 to the neck 31.

[0095] Anchoring element 13 engages with fastening arrangement 34 to hold cover 1 in the closed position.

[0096] The retaining element 27 formed on the tamper-evident ring 24 is located below the annular enlargement 33.

[0097] The annular sealing lip 8 is located outside the neck 31, that is, the end portion of the neck 31 surrounded by the annular sealing lip.

[0098] The inner surface 9 of the annular sealing lip 8 contacts the outer surface of the neck 31. Specifically, the flexible annular sealing lip 8 can be slightly bent outward when it engages with the neck 31.

[0099] The internal sealing element 14 is located inside the neck 31 such that the convex sealing surface 15 contacts the inner surface of the neck 31. More specifically, the internal sealing element 14 can be bent inward when inserted inside the neck 31.

[0100] The end portion of the neck 31 is thus inserted between the annular sealing lip 8 and the inner sealing element 14.

[0101] In the presence of a front sealing element, the upper edge of the neck 31 abuts against the front sealing element 20, which ensures that the neck 31 extends into the cover 1 by the correct amount.

[0102] The annular sealing lip 8, the internal sealing element 14, and the front sealing element 20 prevent substances (especially gaseous substances) present inside the container from escaping into the external environment, and at the same time prevent substances present in the external environment from entering the container. Therefore, the integrity and properties of the liquid or other substances present in the container are preserved.

[0103] Even when the pressure inside the container causes the lid 1 (particularly the end wall 4) to expand, the lid 1 can still seal the container in a nearly airtight manner. In this case, the end wall can adopt a dome-shaped structure 40, such as... Figure 7 As shown in the figure. These pressures are easily generated, especially when the lid 1 is used to seal a container holding carbonated beverages. These pressures may be generated, for example, due to the container being exposed to relatively high temperatures by the lid 1 or the container being accidentally squeezed.

[0104] If the endwall 4 changes form Figure 7 The dome-shaped structure 40 shown in the diagram has a flexible annular sealing lip 8 that bends and deforms to ensure contact with the neck 31 of the container under any circumstances, thereby maintaining the sealing effect applied by the annular sealing lip 8.

[0105] More specifically, even as the pressure inside the container increases until the front sealing element 20 disengages from the neck 31 (more specifically from the upper edge 39 of the neck 31) (as... Figure 7 In the case shown in the diagram, the annular sealing lip 8 and the inner sealing element 14 can also maintain contact with the neck 31.

[0106] The internal sealing element 14 may also be modified, for example, with Figure 6 The different inclined configurations shown are illustrated. In all cases, the convex sealing surface 15 remains in contact with the neck 31.

[0107] Compared to the case where the corner section 5 is solid (i.e., there is no recess 13 between the continuous outer ribs 12), the corner section 5 is lighter due to the presence of the recess 13, the first wall portion 6, and the second wall portion 7. This allows for a limitation on the amount of polymer material used in the production of the cover 1.

[0108] The outer rib 12 allows the corner section 5 to be reinforced, thereby ensuring sufficient rigidity to meet major industrial requirements in practice.

[0109] Furthermore, the first wall portion 6 ensures good drag even as the skirt portion 2 widens, for example, when the skirt is pushed outward due to the thermal expansion effect of the neck 31, which is related to the high temperature that the neck 31 may experience. The inclined construction of the first wall portion 6 is intended to deform the first wall portion 6 when the component of the force applied to the first wall portion 6 compresses the first wall portion 6 in its main extension direction (i.e., transverse to the axis Z), which requires a relatively high force.

[0110] Figure 4 A cover 101 according to an alternative embodiment is shown, which differs from... Figure 1 and Figure 2 The cover 1 shown is different in height because the height H2 of the internal sealing element 14 included in the cover is lower than the corresponding height of the internal sealing element 14 included in the cover 1, but other dimensions are the same.

[0111] exist Figures 1 to 3 The cover 1 shown is Figure 4 In both of the lids 101 shown, the thickness of the end wall 4 can vary depending on the specific requirements of the combination of the lid and the container to be sealed.

[0112] When containers sealed by lids 1 and 101 are stored, for example, inside storage units or containers, high temperatures may be reached, especially due to exposure to sunlight or high external temperatures, even exceeding 50°C.

[0113] At these temperatures, the material used to make the neck 31 may soften, especially if the container is made of an amorphous material such as polyethylene terephthalate. On the other hand, the lid, which is usually made of a semi-crystalline material and maintains greater rigidity even at relatively high temperatures, is more rigid and may deform under the high pressure generated inside the container, thereby deforming the neck 31 and damaging it.

[0114] To prevent this from happening, the thickness of the end wall 4 can be selected when designing the lid so that the end wall 4 allows at least part of the gas present in the container to escape, thereby reducing the pressure in the container and preventing the lid 1, 101 from causing permanent damage to the container.

[0115] Specifically, the thickness of the end wall 4 can be appropriately selected in some predetermined sections, for example, in the central section 41 of the end wall 4 near the axis Z and in the outer peripheral section 42 of the end wall 4 near the annular sealing lip 8.

[0116] The thickness of the end wall 4 can be constant, which means that the thickness of the end wall 4 in the central section 41 is equal to the thickness of the end wall 4 in the peripheral section 42.

[0117] Alternatively, different sections of the end wall 4 may have different thicknesses. For example, the thickness of the end wall 4 in the central section 41 may be different from (greater or less than) the thickness of the end wall 4 in the peripheral section 42.

[0118] When the container containing carbonated beverages is sealed with caps 1 and 101, the thickness of the end wall 4 can vary from 0.6 mm to 1.5 mm, and more particularly from 0.8 mm to 1.2 mm.

[0119] If the thickness of the end wall 4 in the central section 41 is different from the thickness of the end wall 4 in the peripheral section 42, the difference between the two thicknesses can vary from 0.1 mm to 0.6 mm, more specifically from 0.2 mm to 0.4 mm.

[0120] When the caps 1 and 101 seal a container intended to contain carbonated beverages, the thickness S of the skirt 2 can be between 0.6 mm and 1.1 mm, and more particularly between 0.7 mm and 0.9 mm.

[0121] like Figure 2 As shown, the thickness S is measured between the outer surface of the skirt 2 (specifically, the outer surface from which the knurled line 21 (if present) protrudes) and the inner surface of the skirt 2 (from which at least one anchoring element 13 protrudes).

[0122] The exhaust passage 28 and / or the interruption 29 can be formed as a recess with a depth between 0 mm and 0.5 mm. If the depth of the exhaust passage 28 and / or the interruption 29 is equal to 0, then the exhaust passage 28 and / or the interruption 29 is a section without the anchoring element 13.

[0123] More specifically, the depth of the exhaust passage 28 and / or the interruption 29 may be between 0.15 mm and 0.35 mm.

[0124] In the case where the anchoring element 13 includes an internal thread formed on the cap and adapted to engage with an external thread formed on the neck 31, the internal thread and the external thread may have different angular extensions from each other.

[0125] Specifically, the angular extension of the internal thread on the cap can be greater than the angular extension of the external thread on the neck.

[0126] More specifically, when the caps 1 and 101 are intended for use in containers with a volume greater than one liter, when the caps 1 and 101 are screwed onto the neck 31, the internal threads on the caps can continue to extend toward the free edge 30 beyond the external threads on the neck 31. The internal threads on the caps 1 and 101 screwed onto the neck 31 can continue to extend toward the free edge 30 beyond the external threads on the neck 31 by an angular extension between 30° and 270°, particularly between 90° and 180°.

[0127] As a supplement and alternative to the above, it is also possible that when the caps 1 and 101 are screwed to the neck 31, the internal threads formed on the caps extend toward the end wall 4 beyond the external threads formed on the neck, with the extension angle being between 10° and 90°, for example, 20° to 60°.

[0128] Caps 1, 101, or caps with a similar structure can be applied to all necks currently in use for carbonated beverages.

[0129] Specifically, the cap according to the invention can be applied to recently introduced low necks, i.e., height X between 12 mm and 17 mm and inner diameter C in the opening section equal to approximately 21.75 mm (see...). Figure 5 ( ) neck.

[0130] like Figure 5 As shown, the height X is the distance between the lower surface of the annular element 32 and the upper edge 39 of the neck 31.

[0131] The cap according to the invention can be applied to necks with a single thread (i.e., a thread extending along a single helix) or to necks with more than one thread, such as a neck with two threads.

[0132] The cap according to the invention can also be applied to a neck with a nominal diameter of 38 mm, for example, a height X of approximately 24.5 mm and a threaded outer diameter T of approximately 37.2 mm (see...). Figure 5 Furthermore, the neck inner diameter C in the opening section is approximately 31 mm.

[0133] The cap according to the invention can also be used in combination with a lower neck, such as a so-called "38 mm" neck, for example a neck with a height X of about 17.5 mm and an inner diameter C in the opening section equal to about 32 mm.

[0134] Furthermore, the cap according to the invention can be applied to special necks, such as necks with a height X of approximately 12.6 mm, an inner diameter C of 25.1 mm in the opening section, and a threaded outer diameter T of approximately 29.5 mm.

[0135] For a neck intended for use on containers for carbonated beverages with a height X of approximately 15 mm and a threaded outer diameter T of approximately 26.5 mm, a cap of the type described above with a minimum height of approximately 14 mm and an outer diameter between approximately 28 mm and 30 mm can be used.

[0136] In general, when intended for use in containers holding carbonated beverages, lids 1, 101, or similar can have a weight between 1.5 grams and 2.2 grams.

[0137] When intended for use in containers holding non-carbonated beverages, lids 1, 101, or similar can have a weight between 1 gram and 1.8 grams.

[0138] The cap described above is made of polymer materials, such as polypropylene (PP) or polyethylene (PE).

[0139] If PE is used, its density can range from low to high. In particular, high-density polyethylene (HDPE) can be used.

[0140] The high-density polyethylene (HDPE) used to produce the above-mentioned caps can have the following properties:

[0141] - Density between 950 kg / m³ 3 Up to 968 kg / m 3 ;

[0142] - The melt index ranged from 0.3 g to 20 g under the measurement conditions of 10 minutes, 190°C, and 2.16 kg.

[0143] - The molecular weight distribution is large, narrow, unimodal, or multimodal.

[0144] If PP is used, the material can be in the form of homopolymer, multiphase copolymer, or statistical copolymer.

[0145] Under the measurement conditions of 10 minutes, 230°C, and 2.16 kg, the melt index of PP can vary from 2 g to 20 g.

[0146] The above-described type of cap is suitable for use on necks, such as those shown in the table below, each neck being associated with a corresponding name which is named according to the CETIE (www.cetie.org) or ISBT (www.bevech.org) nomenclature and identifies the name of the neck, the diameter of the outer surface of the neck, and the diameter of the dispensing opening of the neck.

[0147] For each acronym, if the neck also conforms to European standards, a reference number will also be indicated.

[0148] GME30.39 25 / 22 mm

[0149] GME30.28 26 / 22 mm DIN EN 16594:2016

[0150] GME30.38 26 / 22 mm

[0151] GME30.37 26 / 22 mm

[0152] GME30.40 26 / 22 mm

[0153] GME30.24 27 / 22 mm EN 16067:2012

[0154] PCO1881 28 / 22 mm

[0155] PCO1810 28 / 22 mm

[0156] GME30.26 29 / 25 mm EN 16592:2015

[0157] GME30.21 30 / 25 mm EN 16064:2012

[0158] GME30.31 32 / 26 mm

[0159] GME30.36 32 / 27 mm

[0160] GME30.30 33 / 28 mm

[0161] GME30.25 38 / 33 mm

[0162] GME30.29 38 / 32 mm

Claims

1. A lid for a container, the lid (1; 101) includes: End wall (4); skirt (2), extending around axis (Z); A corner section (5), located between the end wall (4) and the skirt (2), includes a first wall portion (6) and a second wall portion (7). The first wall portion extends from the skirt (2) toward the interior of the cover, and the second wall portion protrudes from the end wall (4) and joins the first wall portion (6). The first wall portion (6) and the second wall portion (7) define a stepped portion on the outer surface of the corner section (5) facing the cover (1; 101). The cover also includes a plurality of outer ribs (12) located in the corner section (5). The cap also includes an annular sealing lip (8) defined by an inner surface (9) configured to engage with the outer surface of the neck (31) of the container, characterized in that the annular sealing lip (8) extends from the region where the first wall portion (6) and the second wall portion (7) meet toward the free edge (30) of the skirt portion (2), wherein the annular sealing lip (8) is a continuation of the second wall portion (7) toward the free edge (30), and wherein the annular sealing lip (8) is configured to bend toward the axis (Z) of the cap when the end wall (4) deforms outward.

2. The cover according to claim 1, wherein, The annular sealing lip (8) extends parallel to the axis (Z).

3. The cover according to claim 1, wherein, The thickness of the annular sealing lip (8) decreases in the direction oriented toward the free edge (30).

4. The cover according to claim 1, wherein, The inner surface (9) defining the annular sealing lip (8) is curved.

5. The cover according to claim 1, wherein, The outer rib (12) is a continuation of a plurality of knurled lines (21) provided on the skirt (2).

6. The cover according to claim 1, wherein, The thickness of the end wall (4) is between 0.6 mm and 1.5 mm.

7. The cover according to claim 1, wherein, The thickness of the end wall (4) in its central section (41) near the axis (Z) is different from the thickness of the end wall (4) in its outer peripheral section (42) near the annular sealing lip (8), and wherein the difference between the thickness of the end wall (4) in the central section (41) and the thickness in the outer peripheral section (42) is between 0.1 mm and 0.6 mm.

8. The cover according to claim 1, wherein, The thickness of the skirt (2) is between 0.6 mm and 1.1 mm.

9. The cover according to claim 1, wherein, At least one anchoring element (13) is provided on the inner surface of the skirt (2) for removably securing the cover (1; 101) to the neck (31) of the container.

10. The cover according to claim 9, wherein, At least one vent (28; 29) is provided on the inner surface of the skirt (2) to allow any gas to escape from the container during opening. The vent (28; 29) is in the form of a recess that interrupts the anchoring element (13) and penetrates into the thickness of the skirt (2) to a depth of less than 0.5 mm.

11. The cap according to claim 1, further comprising an internal sealing element (14) extending from the end wall (4) toward the interior of the cap (1; 101), the internal sealing element (14) having an annular shape and being coaxially positioned inside the annular sealing lip (8).

12. The cover according to claim 11, wherein, The internal sealing element (14) is defined by a convex sealing surface (15) facing the annular sealing lip (8), and the internal sealing element (14) is intended to be positioned inside the neck (31) of the container so that the convex sealing surface (15) engages with the inner surface of the neck (31).

13. The cap according to claim 11 further includes a front sealing element (20) in the form of an annular protrusion extending from the end wall (4), and the front sealing element is positioned between the annular sealing lip (8) and the inner sealing element (14) for engagement with the front edge (39) of the neck (31).

14. The cap according to claim 1, the cap being intended for use in a container for containing carbonated beverages, the cap having a weight between 1.5 grams and 2.2 grams.

15. The lid according to claim 1, wherein the lid is intended for use in a container for containing a non-carbonated beverage, the lid having a weight between 1 gram and 1.8 grams.

16. An assembly of a container neck (31) and a cap (1; 101) according to claim 1, wherein, The annular sealing lip (8) is located outside the end portion of the neck (31), and the inner surface (9) of the annular sealing lip (8) is in contact with the outer surface of the neck (31).

17. An assembly of a neck (31) of a container and a cap (1; 101) according to claim 1, the cap (1; 101) being applied to the neck (31) and having an internal thread that engages with an external thread formed on the neck (31), wherein, The internal thread and the external thread have different angular extensions around the axis (Z).

18. The assembly according to claim 17, wherein, The internal thread present on the cover extends more angularly about the axis (Z) than the external thread present on the neck extends more angularly about the axis.

19. The assembly according to claim 17, wherein, When the cap (1, 101) is screwed onto the neck (31), the internal thread present on the cap continues to extend toward the free edge (30) beyond the external thread present on the neck (31) by an angular extension between 30° and 270°.

20. The assembly according to claim 17, wherein, When the cap (1, 101) is screwed onto the neck (31), the internal thread formed on the cap extends toward the end wall (4) beyond the external thread formed on the neck by an angle extension between 10° and 90°.

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