Closure cap, container comprising the closure cap, and method for producing a closure cap

Description

[0001] The present invention relates to a closure cap for a screw cap. The present invention also relates to a container with a closure cap.

[0002] Known containers comprising a container body and a closure cap which closes the container body have the disadvantage that their recycling is extremely complex. Such containers, which are used, for example, as disposable beverage containers, are produced in enormous numbers and should increasingly be disposed of properly and preferably recycled in the future. The recycling of such beverage containers is very complex because the container body and the closure cap are usually made of different materials, with the container body usually being made of PET (polyethylene terephthalate) and the closure cap usually being made of an elastic solid material such as PE (polyethylene) or PP (polypropylene). Such beverage containers are usually returned either with the closure cap in place or at least with partial components of the closure cap, such as the tamper-evident strip.However, optimal recycling of the materials used in such beverage containers is only possible if the materials are separated by type after recycling. Completely removing the cap or tamper-evident band from the container body is very laborious, which is why such beverage containers are occasionally incinerated and therefore not recycled.

[0003] Known beverage containers comprise, for example, a container body designed as a PET bottle and comprise a closure cap, for example designed as a so-called PCO-28 closure, either with a height of 21 mm (Type 1810) or 18 mm (Type 1881).

[0004] Document US2017 / 0057139A1 discloses a closure cap according to the preamble of independent claim 1.

[0005] However, without additives, this closure cap is unsuitable for closing known beverage containers such as PET bottles, and in particular for closing PET bottles with a PCO-28 screw cap. There is no evidence of initial opening. Furthermore, a beverage container containing a pressurized fluid cannot be reliably closed with this closure cap. US Pat. No. 3,753,510 discloses a multi-part closure cap whose production is very complex.

[0006] Based on the cited prior art, the present invention is based on the object of at least reducing these and other disadvantages of the prior art and, in particular, of providing a closure cap of the type mentioned above that, compared to known closure caps, is preferably easier to recycle and preferably also easier to manufacture. Furthermore, the present invention is based on the object of simplifying the recycling of containers comprising the closure cap.

[0007] This object is achieved by a closure cap and a container comprising such a closure cap having the features of the independent claims. Advantageous embodiments and further developments are the subject of the dependent claims.

[0008] The object is achieved in particular by a closure cap according to independent claim 1

[0009] Also disclosed is a method for producing a closure cap comprising a closure cap axis, a cover disc, and a cylindrical cap shell with an engagement element projecting towards the closure cap axis, in which a first mold half and a second mold half form a shaping cavity in the closed state, in which the outer contour of the closure cap is determined by the first mold half, in which the inner contour of the closure cap is essentially determined by the second mold half, wherein the first mold half has a finger-like web extending in the direction of the closure cap axis and protruding into the cavity, wherein a cavity part delimiting the engagement element is defined by a mold part of the second mold half and by a tip of the web of the first mold half,Such that, when the cavity is filled with plastic, the closure cap comprising the cover disc and the cap skirt with engagement element is produced, wherein the web also creates an opening in the cover disc, wherein the two mold halves are linearly displaced relative to each other during opening, and the produced closure cap is released and ejected without forced demolding or spindle removal. The first and second mold halves preferably form a common interior space, wherein the common interior space is preferably free of undercuts. The closure cap, which is still in the mold immediately after its production, is thus preferably removed from the mold without undergoing plastic deformation. The closure cap according to the invention can therefore also be produced from a material such as PET.

[0010] The closure cap according to the invention is particularly advantageously designed such that the entire closure cap can be manufactured by injection molding without forced demolding, wherein the entire closure cap is preferably designed without undercuts. The closure cap comprises a sealing lip molded onto the lid disc, wherein the sealing lip preferably runs concentrically to the closure cap axis.

[0011] The sealing lip preferably has a length in the range of 1 mm to 3 mm in the direction of the closure cap axis, particularly preferably in the range of 1.7 mm to 2.3 mm. The closure cap can, for example, have a total height in the range of 18 mm to 21 mm in the direction of the closure cap axis. The entire closure cap, including the sealing lip, is preferably designed as a single piece or in one piece. It has no undercut, so that the sealing lip can also be manufactured without forced demolding.

[0012] The method for producing the closure cap allows it to be manufactured preferably without forced demolding. This offers the advantage that the closure cap can be manufactured particularly cost-effectively, for example, from materials consisting essentially of PET, PE, or PP, but particularly preferably from PET or essentially of PET. In an advantageous embodiment, the closure cap preferably has a length in the range of 18 mm to 21 mm in the direction of the closure cap axis.

[0013] Beverage bottles are typically made of PET (polyethylene terephthalate). PET is a very stable plastic that can be stretched very little or not at all during injection molding. Because PET is extremely tough and resilient, it is very shatter-resistant. This is a key reason why beverage bottles are often made of PET, especially since PET also has a high barrier property that can retain carbon dioxide. PET also has a high aroma density and very good grease resistance.

[0014] In a particularly advantageous embodiment, the closure cap according to the invention is also made of PET. The closure cap according to the invention is designed in such a way, or the method for producing the closure cap comprises only process steps that do not require forced demolding during production. The closure cap is preferably produced in a mold with an undercut-free cavity. The mold preferably comprises two mold halves that form an undercut-free cavity. To produce the closure cap, injection molding material is introduced into the cavity, wherein the two mold halves are pulled apart and thereby opened after the injection molding material has hardened, and the produced closure cap does not undergo any forced deformation during the opening of the mold or during removal from the mold.Therefore, the process still makes it possible to produce a cap made of PET or consisting essentially of PET. The process is also suitable for producing caps made of materials other than PET, such as PE or PP.

[0015] The closure cap according to the invention, made of PET or substantially PET, is particularly advantageously used in combination with container bodies made of PET or substantially PET, so that the entire container, i.e., both the container body and the closure cap, preferably consists of the same PET material. Such a container is extremely easily recyclable, as material separation of the closure parts and the container body is no longer necessary. Furthermore, the closure cap is particularly advantageously designed such that the closure cap cannot be separated from the container body, or can only be separated with great effort, even after opening, so that it preferably remains permanently connected to the container body.Such a container has the advantage that the entire container, including the container body and the closure cap, can be recycled, and individual parts such as a single closure cap or a single tamper-evident band are eliminated. Such a container is therefore extremely environmentally friendly because, on the one hand, disassembly of the container by separating individual parts is avoided, and, on the other hand, the container is completely and homogeneously recyclable without the need for laborious sorting of different materials.

[0016] Preferably, the container comprising the container body and the closure cap is made from the same material, such as PET. However, in addition to PET, other materials are also suitable for producing the container body and the closure cap from the same material, which are not listed in detail here. The method and the closure cap according to the invention enable production without forced demolding, so that closure caps can also be produced from materials that were previously unsuitable for the production of closure caps because forced demolding was previously required during the production of a closure cap. For example, a closure cap produced in a mold could only be removed from the mold by forced demolding.

[0017] Various embodiments of the invention are described below with reference to drawings, in which identical or corresponding elements are generally provided with identical reference numerals. They show: Fig. 1A perspective top view of a closure cap according to the invention; Fig. 2A top view of the closure cap according to Fig. 1 ; Fig. 3 a bottom view of the closure cap according to Fig. 1 ; Fig. 4 a longitudinal section through the closure cap along the line AA according to Fig. 2 ; Fig. 5 a longitudinal section through the closure cap along the line BB according to Fig. 2 ; Fig. 6 a longitudinal section through another embodiment of a closure cap along the line AA according to Fig. 2 ; Fig. 7 a longitudinal section through the embodiment according to Fig. 6 along line BB according to Fig. 2 ; Fig. 8 a perspective bottom view of the Figs. 6 and 7illustrated closure cap; Figs. 9, 10 and 11 a molding tool and process steps in the manufacture of a closure cap; Fig. 12 a perspective top view of a further embodiment of a closure cap according to the invention; Fig. 13 a top view of the closure cap according to Fig. 12 ; Fig. 14 a bottom view of the closure cap according to Fig. 12 ; Fig. 15 a perspective bottom view of the closure cap according to Fig. 12 ; Fig. 16 a side view of the closure cap according to Fig. 12 ; Fig. 17 a side view of the closure cap rotated by 90° according to Fig. 16 ; Fig. 18 a longitudinal section through the closure cap along the line CC according to Fig. 13 ; Fig. 19 a longitudinal section through the closure cap along the line DD according to Fig. 13; Fig. 20 shows a longitudinal section of a detailed view of a container outlet opening closed with a closure cap according to the invention; Fig. 21 shows a side view of a container neck of a container body; Fig. 22 a view of a guarantee band after its attachment to a container neck ring; Fig. 23 a method step during the attachment of the guarantee band of the closure cap to the container neck ring; Fig. 24 an embodiment of a container neck for fastening the closure cap with a bayonet closure; Fig. 25 a closure cap comprising a bayonet closure part for attachment to the container neck according to Fig. 24 .

[0018] Figure 1shows a perspective view of a closure cap 2 according to the invention with a closure cap axis 10, a substantially cylindrical cap skirt 3, a cover disc 5 and a free edge 7, wherein the closure cap 2 consists substantially of the cap skirt 3 and the cover disc 5, which delimits the cylindrical cap skirt 3 at the top. The closure cap axis 10 runs through the center of the cover disc 5, and the cylindrical cap skirt 3, in particular its outer surface 3b, preferably runs concentrically to the closure cap axis 10. The free edge 7 is located with respect to the direction of the closure cap axis 10 at the end of the closure cap 2 opposite the cover disc 5. The cap skirt 3 runs in one possible embodiment exactly parallel to the closure cap axis 10. Particularly preferably, the cap skirt 3 has in the direction of the closure cap axis 10, as e.g. in Figure 4As shown, the cap skirt 3 has a slightly widening, in particular conically widening, profile from the cover disc 5 to the free edge 7, with an angle relative to the closure cap axis 10 in the range of, for example, 0.1° to 5°. This slight widening of the cap skirt 3 in the direction of the closure cap axis 10 has the advantage that the closure cap 2 can be removed from a mold more easily after its manufacture, and preferably without forced demolding. A cap skirt 3 configured in this way is also referred to herein as a cylindrical cap skirt, since the cap skirt 3 is cylindrical or substantially cylindrical with respect to the closure cap axis 10.

[0019] The closure cap 2 has a circumferential direction U running concentrically to the closure cap axis 10, whereby the closure cap 2 can be opened by rotating it in the opening rotation direction U1. The cap skirt 3 has an outer surface 3b, which can be designed and structured in a variety of ways. In the illustrated embodiment, the outer surface 3b comprises a plurality of grooves 3a running in the direction of the closure cap axis 10. This configuration has the advantage that the outer surface 3b can be better gripped with the fingers.

[0020] The Figure 2 shows a top view and the Figure 3 a bottom view of the closure cap 2 according to Figure 1 , and the Figures 4 and 5 a longitudinal section through the closure cap 2 according to Figure 2 along the section line AA or the section line BB.

[0021] In an embodiment not according to the invention, the closure cap 2 comprises a single engagement element 6 formed on the inside of the cap skirt 3 and projecting from the cap skirt 3 towards the closure cap axis 10, wherein the engagement element 6 is designed as an internally threaded part or as a bayonet closure part. In this embodiment, the cover disc 5 preferably has a single opening 4 in the region of its periphery, wherein the engagement element 6 is arranged with respect to the opening 4 in the direction of the closure cap axis 10, in particular in the extension direction of the closure cap axis 10, and below the opening 4, in the direction of the closure cap axis 10 in a region between the cover disc 5 and the free edge 7. As shown in particular in Figure 4As shown, the engagement element 6 is arranged below the opening 4 in the extension direction of the closure cap axis 10, so that a line parallel to the closure cap axis 10 running through the engagement element 6 also runs through the opening surface of the opening 4. In an advantageous embodiment, the engagement element 6 is arranged in alignment with the opening 4 in the direction of the closure cap axis 10. This means that in an advantageous embodiment, the engagement element 6 is dimensioned such that a light beam running in the direction of the closure cap axis 10 and shining through the opening 4 defines the maximum dimension of the engagement element 6 in a plane running perpendicular to the direction of the closure cap axis 10. This aligned arrangement of the engagement element 6 and the opening 4 in the direction of the closure cap axis 10 is particularly advantageous for Figure 4visible in that the engagement element 6, or the surface 6x of the engagement element 6 directed towards the opening 4, is arranged in the direction of the closure cap axis 10 in alignment with the opening 4, wherein the surface 6x can run perpendicular to the closure cap axis 10, or as in Figure 4 shown, can run at an angle deviating from the vertical with respect to the closure cap axis 10, wherein the surface 6x can be flat or curved.

[0022] The opening 4 has, as in Figure 2 shown, has an opening length 4z in the circumferential direction U, and has an opening width 4y radially to the closure cap axis 10. The engagement element 6 has, as in Figure 3As shown, the engagement element 6 has an engagement element length 6z in the circumferential direction U and an engagement element width 6y radially relative to the closure cap axis 10. Advantageously, the engagement element 6 is arranged in alignment with the opening 4 in the direction of the closure cap axis 10 such that the engagement element length 6z corresponds to the opening length 4z, or they have the same or substantially the same length, and preferably also such that the engagement element width 6y corresponds to the opening width 4y, or they have the same or substantially the same width. It may prove advantageous to design the engagement element length 6z slightly smaller than the opening length 4z and / or to design the engagement element width 6y slightly smaller than the opening width 4y, in particular to more easily remove a closure cap 2 produced by injection molding from a mold.

[0023] In a further advantageous embodiment, the opening 4 has an opening length 4z with respect to the circumferential direction U, and the engagement element 6 has an engagement element length 6z in the circumferential direction U, wherein the opening length 4z is greater than or equal to the engagement element length 6z, wherein the opening length 4z is preferably at least twice as long as the engagement element length 6z.

[0024] In an embodiment according to the invention, the closure cap 2, as shown in the Figures 1 to 5shown, a plurality of openings 4, 4b, 4c and engagement elements 6, 6b, 6c, which are arranged at a distance from one another in the circumferential direction U, preferably at a uniform distance from one another, wherein each engagement element 6, 6b, 6c is assigned a corresponding opening 4, 4b, 4c in the direction of the closure cap axis 10, wherein the engagement element length 6z of the engagement element 6, 6b, 6c is less than or equal to the opening length 4z of the respectively assigned opening 4, 4b, 4c.

[0025] In a further advantageous embodiment, the engagement element lengths 6z of the engagement elements 6, 6b, 6c are designed to be the same length as the opening length 4z of the respectively associated opening 4, 4b, 4c, and preferably have, as shown in the Figures 1 to 5 As shown, all openings 4, 4b, 4c and all engagement elements 6, 6b, 6c have the same length in the circumferential direction U.

[0026] In an advantageous embodiment, the closure cap 2 has at least two openings 4, 4b and two engagement elements 6, 6b, wherein each engagement element 6, 6b is assigned an opening 4, 4b, wherein the closure cap 2 can in particular have between two and twenty engagement elements 6, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6k, 6l, 6m, and correspondingly can have between two to twenty assigned openings 4, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4k, 4l, 4m. Particularly preferably, the closure cap 2 comprises at least eight and preferably at least twelve engagement elements 6, 6b, 6c and preferably at least eight and preferably at least twelve openings 4, 4a, 4b each associated with one of the engagement elements 6, 6b, 6c.

[0027] An inwardly projecting sealing lip 11 is formed on the cover plate 5 of the closure cap 2, whereby the sealing lip 11 can also be designed, for example, in the form of a sealing cylinder or a sealing cone. The sealing lip 11 is, as shown in the Figures 4 to 7 The cover plate 5 of the closure cap 2, as shown for example in the Figures 4, 5 , 18, 19 or 20 shown, comprises a circumferential sealing lip 11, which, as for example in the Figures 3 and 14 shown, runs in the circumferential direction U between the opening 4 or the openings 4, 4b, 4c, 4d, 4e, 4f, 4g, 4h, 4i, 4k, 4l, 4m and the closure cap axis 10. The closure cap 2 and the sealing lip 11 are designed as a single piece or in one piece.

[0028] As in the Figures 4 and 5As shown, each of the engagement elements 6, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6k, 6l, 6m forms an internal thread part, wherein these are advantageously arranged offset from one another in the direction of the closure cap axis 10 such that the entirety of the engagement elements 6, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6k, 6l, 6m form an internal thread with a pitch S in the circumferential direction U, wherein this internal thread, as can be seen from Figure 5 As can be seen, it extends essentially by almost 360° in the circumferential direction U.

[0029] In contrast to the Figures 4 and 5 In the illustrated embodiment, the Figures 6, 7 and 8illustrated engagement elements 6, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6k, 6l, 6m have a different arrangement, wherein these engagement elements are arranged offset from one another in the direction of the closure cap axis 10 in such a way that the entirety of the engagement elements 6, 6b, 6c, 6d, 6e, 6f, 6g, 6h, 6i, 6k, 6l, 6m again form an internal thread in the circumferential direction U, wherein this internal thread extends essentially by almost 720° in the circumferential direction U. The closure cap according to the invention has the advantage that the total length of the internal thread formed by the engagement elements in the circumferential direction U and / or the pitch of the internal thread can be varied within a wide range by a corresponding arrangement and / or a corresponding number of engagement elements, so that the internal thread can also be designed with multiple starts, for example.

[0030] The Figures 9 to 11 show a mold 20 for producing the Figures 1 to 5shown cap 2. As shown Figure 9 As can be seen, the molding tool 20 comprises a first molding tool half 21 and a second molding tool half 22, which form a shaping, preferably undercut-free cavity 23, within which the closure cap 2 is produced by filling the cavity 23 with a plastic material by means of injection molding. Figure 9 the cavity 23 is already filled with plastic material. As can be seen from Figure 10, the two mold halves 21, 22 are mutually displaceable in a linear direction of movement 24, wherein the direction of movement 24 runs parallel to the closure cap axis 10, and wherein the first mold half 21 has finger-shaped webs 21a running in the direction of movement 24, which are spaced apart from the edge of the first mold half 21 by a gap 21b. These finger-shaped webs 21a serve, as in Figure 11explained in detail, especially for the production of the engagement elements 6, 6b .. 6m. Figure 11 shows the molding tool 20 in the fully extended state, in which the produced closure cap 2 can be removed. The first molding tool half 21 comprises an inner surface 21c for producing the outer surface of the cap skirt 3, and comprises a plurality of finger-shaped webs 21a, which have a boundary surface 21d at their tip. The second molding tool half 22 comprises an outer surface 22a for producing the inner surface of the cap skirt 3, and comprises a plurality of grooves 22c, which end in a boundary surface 22b. Each finger-shaped web 21a is assigned a groove 22c, wherein, as in Figure 9As shown, when the mold 20 is closed, all finger-shaped webs 21a engage in the corresponding grooves 22c, and internal cavities are formed by the boundary surfaces 21d and 22b and the side walls of the grooves 22c, which serve to create the engagement elements 6. Each finger-shaped web 21a also creates an opening 4, 4b, .. 4m in the cover plate 5 of the closure cap 2.

[0031] The method for producing a closure cap 2 comprising a closure cap axis 10, a cover disc 5, and a cylindrical cap shell 3 with at least one engagement element 6 projecting toward the closure cap axis 10 is carried out in such a way that a first mold half 21 and a second mold half 22 form a shaping cavity 23 in the closed state, wherein the outer contour of the closure cap 2 is determined by the first mold half 21, wherein the inner contour of the closure cap 2 is essentially determined by the second mold half 22, wherein the first mold half 21 has a finger-like web 21a extending in the direction of the closure cap axis 10 and protruding into the cavity 23, wherein a cavity part delimiting the engagement element 6 is defined by a mold part 22b of the second mold half 22 and by a tip 21d of the web 21a of the first mold half 21,so that when the cavity 23 is filled with plastic, the closure cap 2 comprising the cover disc and the cap skirt 3 with engagement element 6 is produced. The web 21a also creates an opening 4 in the cover disc 5. The two mold halves 21, 22 are linearly displaced relative to one another during opening, and the produced closure cap 2 is released and ejected, preferably without forced demolding. The second mold half 22 comprises an end face 22e, in which a groove 22d for producing a sealing lip 11 is advantageously recessed. The groove 22d is preferably shaped such that the produced sealing lip 11 is free of undercuts, so that the sealing lip 22 is removed from the second mold half 22 without forced demolding during a linear movement of the two mold halves 21, 22 in the direction of movement 24.

[0032] The Figures 12 to 19show a further embodiment of a closure cap 2. The cap skirt 3 is connected to a tamper-evident strip 8 at the end portion opposite the cover disc 5, the free edge 7. The tamper-evident strip 8 is connected to the free edge 7 via a material weakening 9 running circumferentially in the circumferential direction U, preferably via a plurality of separating webs 9a arranged spaced apart in the circumferential direction.

[0033] The tamper-evident strip 8 comprises at least one, and preferably a plurality of, locking parts 8b projecting toward the closure cap axis 10. The at least one locking part 8b is arranged below the opening 4 in the direction of the closure cap axis 10, and in particular aligned with the opening 4. The tamper-evident strip 8 preferably comprises a plurality of locking parts 8b, 8d, 8f, 8h arranged spaced apart from one another in the circumferential direction U, with certain openings 4, 4b, 4c each being assigned a locking part 8b, 8d, 8f, 8h in the direction of the closure cap axis 10. The opening length 4z of the respective opening 4, 4b, 4c is greater than or equal to a locking part length 8z of the associated locking part 8a, 8b, 8c. Preferably, the same opening 4, 4b, 4c is assigned in the circumferential direction U one after the other both an engagement element 6 and a locking part 8a, as can be seen, for example, from the Figures 13 and 14is evident.

[0034] Also those in the Figures 1 to 8 The closure cap 2 shown could be provided with a circumferential guarantee band 8. In an advantageous embodiment, the guarantee band 8 is connected to the cap jacket 3 via an additional first connecting section 12a and an additional second connecting section 12b, wherein the first and the second connecting section 12a, 12b are advantageously connected to one another via a stronger or stiffer connecting part 14, and / or wherein the second connecting part 12b is connected to the guarantee band 8 via a stronger or stiffer connecting part 15. The first connecting section 12a is, in addition to the direct connection to the cap jacket 3, as e.g. in Fig. 16As shown, the first connecting section 12a and the second connecting section 12b are preferably also connected to the cap skirt 3 via a first tear line 13a running in the circumferential direction U. The first connecting section 12a and the second connecting section 12b, in addition to the connecting part 14, are preferably also connected to one another via a second tear line 13b. The second connecting section 12b, in addition to the connecting part 15, is also connected to the tamper-evident strip 8 via the material weakening 9, in particular separating webs 9a. However, the first and / or second tear lines 13a, 13b could also be omitted.

[0035] A closure cap 2 comprising the first and / or second connecting portions 12a, 12b has the advantage that it is held to a container neck via the tamper-evident band 8 even after opening. Preferably, the closure cap or the connecting portions 12a, 12b are designed such that the cap skirt 3 is inseparably connected to the tamper-evident band 8, so that a closure cap remains preferably captively connected to a container neck even after opening.

[0036] The Figures 12 to 19 The closure cap 2 shown is preferably produced with a molding tool which, in addition to the Figures 9 to 11In addition to the first and second mold halves 21, 22 shown, the mold also comprises two further mold halves, which are moved perpendicular to the direction of movement 24 and which, in particular, form the region of the guarantee strip 8, the connecting parts 14, 15, and the connecting sections 12a, 12b, or form the cavity for molding said parts. Such a mold is particularly designed such that the closure cap 2 can be produced and ejected from the mold without forced demolding.

[0037] Figure 21shows a side view, partially in section, of a container neck 31 of a container body 30. The container neck 31 comprises a pouring opening 32, an external thread 33, a projection 34, also referred to as a pilfer-proof ring, and a container neck ring 35. The container neck 31 has an end face 37 and a container outlet inner side 38. In addition, an end section 36 of the container body 30 is also shown. The closure cap 2 according to the invention can, for example, be screwed onto such a container body 30. If the closure cap 2 comprises a tamper-evident ring 8, its locking parts 8a, 8b, 8c, 8d are preferably located below the projection 34 in the direction of the closure cap axis 10. The locking parts 8a, 8b, 8c, 8d are advantageously slipped over the projection 34 as shown in the Figures 22 and 23 shown in such a way that the guarantee ring 8 in the Figure 23shown position over the projection 34, so that the guarantee ring 8 then has the Figure 22 The transfer of the guarantee ring 8 takes place in Figure 23 preferably in such a way that no plastic deformation occurs on the guarantee ring 8 and thus no excessive tensile forces occur.

[0038] In an advantageous embodiment, the container interior is sealed by the closure cap 2 in such a way that the end face 37 of the container neck 31 rests against the closure cap 2. Particularly advantageously, the closure cap 2, as shown in Figure 20shown, also has a sealing lip 11 which rests against the container neck inner side 38. Particularly advantageously, the container neck 31 comprises a container neck inner side 38 with an end section 39 which widens towards the pouring opening 32 and which advantageously widens conically by a constant angle α, wherein the angle α is preferably in a range between 0.5° and 5°. Particularly advantageously, the sealing lip 11 tapers towards its tip, particularly advantageously conically at least in sections, at an angle β which is preferably constant at least in sections. The sealing lip 11 can, for example, also be designed in the form of a sealing cylinder, a hollow cylinder or a sealing cone.For reliable sealing, the container 30 preferably has a container neck 31 whose inner cross-section widens towards the pouring opening 32, and / or the sealing lip 11 preferably has an exclusively tapered outer cross-section in the direction of the closure cap axis 10 opposite to the lid disc 5, as shown in . Figure 20 is shown. The Figure 20 The embodiment shown is particularly suitable for sealing if the container neck 31 or the container body 30 and the closure cap 2 are made of the same material, in particular a material with a low coefficient of elasticity such as PET or substantially PET.

[0039] Figure 24shows a container body 30 whose container neck 31 is designed as part of a bayonet closure. The container neck 31 has on its outer side a complementary engagement element 40 with a section 40a that runs perpendicular to the longitudinal axis of the container neck 31. Figure 25 shows a closure cap 2 with a total of four engagement elements 6, 6b, 6c, 6d projecting towards the closure cap axis 10, wherein these engagement elements are designed as bayonet closure parts, so that this closure cap 2 can be used to close the Figure 24 shown container body 30 is suitable.

[0040] The container body 30, which is closed with the closure cap according to the invention, can be designed in a variety of ways, with the container comprising a container neck 31 with an external thread 33 or with a bayonet closure part. The container can be designed, for example, as a bottle or as a cardboard container comprising a container neck.

[0041] Particularly preferably, at least the container neck and the closure cap are made of the same material, in particular substantially of polyethylene terephthalate (PET). Particularly preferably, the entire container body, including the container neck, is made of the same material as the closure cap. This configuration has the advantage that recycling a container comprising the container body and the closure cap is particularly easy, especially if the tamper-evident band or fragments of the tamper-evident band are still present on the container neck after the container has been opened, and in particular are connected to it.

[0042] In an advantageous embodiment, the openings 4, 4b, ..4m of the closure cap 2 can be closed after the production of the closure cap 2, for example by at least partially filling them with a material such as a plastic. In a further advantageous embodiment, the closure cap comprises an attachment, for example designed as a second cover disc, wherein this attachment has coupling parts running in the direction of the closure cap axis 10, which are arranged and designed such that they fit into at least one and preferably into all openings 4, 4b, ..4m of the closure cap 2, and are preferably firmly connectable or connected to the closure cap 2, preferably in such a way that the attachment rests against the first lid disc 5, and preferably rests flatly, wherein the diameter of the attachment is preferably selected such that the attachment covers all openings 4, 4b, .. 4m. Advantageously, the attachment has the same diameter as the lid disc 5 of the closure cap 2. The attachment can be designed in a variety of ways and could, for example, also be designed as a container or a drinking vessel that is firmly or detachably connected to the closure cap 2.

Claims

1. Closure cap (2) with a closure cap axis (10), a cylindrical cap casing (3), a cover disc (5) and an engaging element (6) formed on the inside of the cap casing (3) and projecting towards the closure cap axis (10), wherein the engaging element (6) is designed as an internal threaded part, wherein the cover disc (5) has an through-opening (4) in the region of its periphery, wherein the engaging element (6) is arranged with respect to the through-opening (4) in the direction of the closure cap axis (10) below the through-opening (4) in relation to the through-opening (4), wherein the engaging element (6) is arranged in the direction of the closure cap axis (10) in alignment with the through-opening (4), wherein, with respect to a circumferential direction (U) of the closure cap axis (10), a plurality of through-opening (4, 4b, 4c) and engaging elements (6, 6b, 6c) are arranged at a distance from one another such that each engaging element (6, 6b, 6c) has a corresponding through-opening (4, 4b, 4c) in the direction of the closure cap axis (10), and wherein the engaging element length (6z) of the engaging element (6, 6b, 6c) is less than or equal to the opening length (4z) of the respectively associated through-opening (4, 4b, 4c), wherein each engaging element (6, 6b, 6c) forms an internal threaded part, these being arranged in the direction of the closure cap axis (10) in such a way that they are offset relative to one another so that the entirety of the engaging elements (6, 6b, 6c) form an internal thread with a pitch (S) in the circumferential direction (U)[1], characterised in that the cover disc (5) comprises a circumferential sealing lip (11) which extends in the circumferential direction (U) between the through-opening (4) and the closure cap axis (10), that the circumferential sealing lip (11) is moulded onto the cover disc (5), and that the sealing lip (11) is designed without undercuts.

2. Closure cap according to claim 1, characterised in that the through-opening (4) has an opening length (4z) relative to the circumferential direction (U) of the closure cap axis (10), in that the engaging element (6) has an engagement element length (6z) in the circumferential direction (U), and that the opening length (4z) is greater than or equal to the engagement element length (6z).

3. Closure cap according to one of the preceding claims, characterised in that the engaging element lengths (6z) of the engaging elements (6, 6b, 6c) are the same length as the opening length (4z) of the respective associated through-opening (4, 4b, 4c), and in particular that all through-openings (4, 4b, 4c) and all engaging elements (6, 6b, 6c) have the same length in the circumferential direction (U).

4. Closure cap according to one of the preceding claims, characterised in that it has at least eight and preferably at least twelve through-openings (4, 4b, 4c) and engaging elements (6, 6b, 6c).

5. Closure cap according to one of the preceding claims, characterised in that it is made of polyethylene terephthalate (PET) or essentially of polyethylene terephthalate (PET).

6. Closure cap according to one of the preceding claims, characterised in that the sealing lip (11) is hollow cylindrical in shape.

7. Closure cap according to one of the preceding claims, characterised in that the outer cross-section of the sealing lip (11) tapers in the direction opposite to the closure cap axis (10) relative to the cover disc (5).

8. Closure cap according to one of the preceding claims, characterised in that the cap casing (3) has a free edge (7) at the end section opposite the cover disc (5), in that a guarantee band (8) is connected to the free edge (7) via a material weakening (9) extending in the circumferential direction (U), preferably via separating webs (9a) connected to the free edge (7), that the guarantee band (8) comprises a locking part (8b) projecting towards the closure cap axis (10), and that the locking part (8b) is arranged in the direction of the closure cap axis (10) below the through-opening (4) and in particular aligned with the through-opening (4).

9. Closure cap according to claim 8, characterised in that the guarantee band (8) comprises a plurality of locking parts (8b, 8d, 8f, 8h) arranged in a circumferential direction (U) and spaced apart from one another, that certain through-openings (4, 4b, 4c) are each assigned a locking part (8b, 8d, 8f, 8h), and in that the opening length (4z) of the respective through-opening (4, 4b, 4c) is greater than or equal to a locking part length (8z) of the associated locking part (8a, 8b, 8c).

10. Closing cap according to claim 8 or 9, characterised in that both an engagement element (6) and a locking part (8a) are assigned to the same through-opening (4, 4b, 4c) in the circumferential direction (U) in succession.

11. Container (30) comprising a pouring opening (32) and comprising a closure cap (2) according to one of the preceding claims, wherein the pouring opening (32) is closed by the closure cap (2).

12. Container according to claim 11, characterised in that the container (30) and the closure cap (2) are made of the same material, in particular polyethylene terephthalate (PET) or essentially polyethylene terephthalate (PET).

13. Container according to one of claims 11 or 12, characterised in that the container (30) has a container neck (31) whose inner cross-section widens towards the pouring opening (32), and / or that the sealing lip (11) has an exclusively tapered outer cross-section in the direction opposite to the cover disc (5) of the closure cap axis (10).

14. Container according to claim 13, characterised in that the inner cross-section of the container neck (31) widens conically towards the pouring opening (32), preferably by a constant opening angle (α), wherein the opening angle (α) is preferably in a range between 0.5° and 5°.