EP2720958A1

EP2720958A1 - Closure seal

Info

Publication number: EP2720958A1
Application number: EP12728493.3A
Authority: EP
Inventors: Peter Rothweiler
Original assignee: Alfelder Kunststoffwerke Herm Meyer GmbH
Current assignee: Alfelder Kunststoffwerke Herm Meyer GmbH
Priority date: 2011-06-17
Filing date: 2012-06-14
Publication date: 2014-04-23
Anticipated expiration: 2032-06-14
Also published as: WO2012172029A1; DE202011050481U1; EP2720958B1

Abstract

The invention relates to a substantially circular closure seal for closing a container, which closure seal has a secondary seal (2) and, under it, a primary seal (3) with a circular surface (F) with a radius (R) for adhesive bonding onto the top edge of a container opening, wherein the primary seal (3) and the secondary seal (2) are connected releasably to one another by a release layer (7), wherein the secondary seal (2) is adapted to the shape of the primary seal (3), wherein the primary seal (3) has at least one tab (8) which extends in the radial direction. In order to provide a closure seal which can be detached easily and in one piece from a container opening and which, moreover, can be produced inexpensively, it is proposed according to the invention that the primary seal (3) has a plurality of tabs (8) which are arranged along the closure-seal circumference at identical angular spacings, protrude beyond the edge of the circular surface, have the shape of a ring section which runs around the centre point of the closure seal (1) directly outside the circular surface (F), and the radial projection of which beyond the circular surface (F) in the radial direction is between 1 mm and 5 mm, preferably between 2 and 4 mm.

Description

closure seal

The invention relates to a substantially circular closure seal for closing a container having a secondary seal and including a primary seal having a circular surface (F) with a radius (R) for adhering to the edge of a container opening, wherein the primary seal and the secondary seal by a Separating layer are releasably connected together.

The circular surface corresponds to the defined by the outer radius of a corresponding container opening circular area. Only on the closure seal itself, more precisely on the primary seal, is the circular area the one that can be projected onto the primary seal and has a maximum radius without overhanging the edge of the primary seal. That is, the circular area or its periphery coincides completely according to the prior art with the surface of the primary seal or its edge. The invention also relates to a combination of a substantially circular closure seal, a closure with a circumferential closure shell and a top plate, wherein the closure shell has on its inside near the top plate at least one radially inwardly extending projection and the closure seal between the projection and the The container opening has an outer diameter d and the closure lid between the projection and the top plate has an inner diameter D, wherein the closure seal a secondary seal and including a primary seal for sticking on having the edge of the container opening, wherein the primary seal and the secondary seal are releasably connected to each other by a release layer.

As a release layer z. As a polymer separation layer is provided which can be produced inexpensively and is suitable for use with food or pharmaceuticals. Such closure seals are known and are used inter alia for sealing containers for food, chemicals or medicines. The closure seal is applied with its primary seal facing the container for this purpose after filling the container on the edge of the container opening, so as to protect the contents of the container from manipulation or other environmental influences, in particular from unwanted oxygen or humidity supply. In this case, an unwanted detachment of the closure seal is prevented for example by the fact that the primary seal on the upper edge of the container opening z. B. is glued by means of inductive heating with a heat seal adhesive. Is later for the use of the container contents the secondary seal z. B. separated by unscrewing a closure cap from the primary seal and the primary seal has been removed from the container opening, then used when re-closing the container, the secondary seal for sealing the container opening. The held between the projection or bead and the top plate secondary seal is pressed when screwing the screw on the upper edge of the container opening, so that it is sealed. The degree of sealing depends on the material of the secondary seal and the contact pressure.

To produce the closure seal, the individual material webs for the secondary seal, the release layer and the primary seal are laminated to form a material web composite. From the material web composite, the closure seals are punched out in a further step.

The material webs for known primary seals typically again comprise a PET layer, an aluminum layer and a heat seal adhesive arranged in this order on one another, wherein the aluminum layer may be printed or may have a printed film layer. The imprint or printed film layer is used primarily for marketing purposes or for representing consumer information. The material web for the secondary seal often consists of a chromium carton or a sandwich of two polypropylene squeezers, ie P P layer, limited polyethylene foam layer, in short PE foam layer. With the PP layers, the pores of the foam layer are closed in such a way that no product particles and / or impurities or germs can settle therein.

The punched-seal seals are introduced with the secondary seal in the front in the screw cap of a container, wherein the closure seal is pressed against the top plate and thereby between the projection, the z. For example, the form of a at least partially in the circumferential direction extending bead may or may consist of several, distributed along the inner periphery of the closure shell, separate projections, and the top plate of the screw cap is arranged. The diameter of the closure seal is at least partially greater than that defined by the one or more projections free inner diameter of the closure shell, so that the corresponding radially outer portions of the closure seal in the radial region between the inner diameter D of the closure shell and defined by the one or more projections Diameter of the closure shell lie. The projection or bead thus holds the closure seal in place and thus prevents the closure seal from accidentally falling out when the screw cap is screwed onto the container.

When first applying the cap, for example, screwing a screw cap, the closure seal is pressed with the primary seal facing the container by the axial movement resulting from the rotating screwing movement on the upper edge of a circular container opening. By inductive heat sealing, the primary seal is then glued to the edge of the container opening. The result is an airtight and humidity-tight seal the container opening.

When unscrewing the screw cap from the container for the first time, the primary seal along the separating layer is separated from the secondary seal by the rotational movement and the resulting force in the direction of the top plate. The secondary seal remains in the screw between the projection or bead and the top plate, while the primary seal continues to reliably close the container opening. To fully open the container opening, the closure seal can be cut, pierced and then removed. After piercing or cutting the primary seal, the container opening is completely or partially exposed by cutting or tearing it. The piercing or cutting of the primary seal generally requires the use of a tool and is therefore cumbersome. If the primary seal is forcibly destroyed by pushing it in with the bare fingers or fingernails, the primary seal often gives way only under great force and is thus uncontrolled. The fingers used for opening can be immersed in the product or the container can be knocked over by the jerky movement when yielding the primary seal and the product emerge unintentionally. Also, piercing or cutting the primary seal with a tool involves the risk that the container contents underneath will be damaged or contaminated by the tool used, eg knife or scissors. Also stay of that cut or torn primary seal often adhere remnants to the edge of the container opening, which interfere with the removal of the product.

In order to avoid these problems, tabs have also been proposed in the prior art which are mounted on the primary seal top and with the aid of which the primary seal is to be withdrawn from the container opening. For example, the primary seal may consist of two layers that are only half glued together so that the non-bonded half of the top layer may act as a tab that can be used to peel off the primary seal. However, such a tab effectively has two diametrically opposite points of attachment or detachment points from the container opening, which requires a relatively large expenditure of force during detachment.

In addition, the application of a tab on the primary seal top is associated with a significant manufacturing effort that drives up manufacturing costs. Also, an improper attachment of the tab to the primary seal top may result in it tearing off in attempting to subtract the primary seal from the container opening. A removal of the primary seal is then possible again only with a tool.

Compared to this prior art, it is an object of the present invention to provide a closure seal, which is easy to solve in one piece from a container opening and which can also be produced inexpensively.

The object is achieved by a substantially circular closure seal having the features mentioned, wherein the primary seal has at least one extending in the radial direction tab whose projection over the circular surface (F) in the radial direction between 1 mm and 5 mm, preferably between 2 mm and 4 mm.

With regard to the above combination, the object is further achieved in that the primary seal has at least one radially extending tab whose projection in the radial direction is at least 1 mm and at most half the difference between the outer diameter d of the container opening and the inner diameter D of the closure shell corresponds. A tab with such a protrusion in the radial direction allows after unscrewing the cap and thereby carried out separation of the secondary seal from the primary seal a simple and secure gripping of the tab, so that the primary seal as a whole can be detached from the upper edge of the container opening. In this case, the size of the supernatant ensures that the tab of the primary seal, together with the corresponding parts of the secondary seal in the screw cap, extends radially into the area between the projection and bead and the top plate, thereby bending the tab when inserting the closure seal and thus Also, an unwanted sticking of the tab with the remaining primary sealing surface during heat sealing is effectively avoided.

In any case, the secondary seal completely covers the primary seal, including the tab. This is advantageous because the secondary seal during insertion of the closure seal in the screw cap supports the tab and so unwanted deformations of the closure seal, in particular a bending of the tab is effectively prevented.

In a preferred embodiment, the secondary seal is precisely adapted to the shape of the primary seal. Such closure seals can be produced on punching out of a material web with less material loss, since the closure seals can be arranged close to one another on the material web by projecting the tab (s) of a closure seal into the region outside a tab or between tabs of an adjacent closure seal.

In one embodiment, the primary seal has a plurality of protruding tabs arranged at equal angular intervals along the closure seal periphery. The plurality of tabs facilitates detachment of the primary seal in any orientation of the primary seal. Also, the primary seal with the help of the remaining tabs can still be detached from the container opening, if individual tabs tear off due to incorrect operation or excessive pulling.

In a preferred embodiment, the primary seal has four tabs arranged at equal angular intervals along the circumference of the closure seal. The four tabs provide access for opening or detaching the primary seal from four sides distributed at equal angular intervals over the peripheral edge of the closure seal, which are thus immediately visible to the consumer after opening a container.

In a further preferred embodiment, the at least one tab is a ring section extending around the center of the closure seal immediately outside the circular area. The tab extends with a supernatant circular arc around the circular surface of the closure seal or the primary seal. Thus, the contact surface for the detachment of the primary seal can additionally extend sufficiently far (eg up to 270 °) in the circumferential direction, whereby a correspondingly large attack surface is achieved with a small radial expansion.

In one embodiment, the at least one tab preferably extends in the circumferential direction over an angle segment between 10 ° and 60 °, preferably between 20 ° and 45 °. Alternatively, the tabs extend in the circumferential direction of the substantially circular primary sealing surface over a length of 5 mm to 60 mm. A tab which extends over such an angular segment or a length of 5 mm to 60 mm in the circumferential direction ensures that the tensile force applied to detach the primary seal is distributed over the angular segment or the respective peripheral section and any shearing force peaks the transition between tab and primary sealing surface are largely avoided. Such tabs are easy to grip and thus facilitate the detachment of the primary seal from the container opening.

If only a single tab is provided, for the required support behind a projection in a closure cap, either the secondary seal must have a larger diameter than the primary seal, or the tab of the primary seal which is congruent with the secondary seal must extend for more than 180 ° in the circumferential direction ,

An embodiment of the secondary seal consists of a material that is thicker and stiffer than the primary seal.

In one embodiment, the secondary seal is a chromo-carton, which is preferably 0.75 mm thick. A chromium carton is inexpensive to manufacture, environmentally friendly and has high rigidity at low density. In another embodiment, the secondary seal is a sandwiched PE or PP foam layer bounded by two polymer layers (for example PP, PE or PET), having a density of between 150 and 500 kg / m ³ and the total thickness of the secondary seal being at most 3, 0 mm and a minimum of 0.5 mm. The use of a PE foam layer with such a density and material thickness achieves a layer thickness of the elastic sealing material which is sufficient for sealing the container opening. In order to obtain good adhesive properties, it is provided in one embodiment that the heat-sealable adhesive is applied with an areal density of between 5 and 65 g / m ² , for example 25 g / m ² . In one embodiment, the aluminum layer is between 10 and 50 μηη, preferably 20 μηη thick and thicker than the adjacent PET and hot melt adhesive layers. A 20 μηη thick aluminum layer has sufficient stability at a low weight and this aluminum layer receives an improved tear strength by the additionally applied PET layer.

In one embodiment, the PET layer 12 is μηη thick.

In one embodiment, it is provided that the secondary seal is circular, wherein the primary seal next to its circular surface has an additionally attached tab, wherein the radius corresponds to the distance between the closure seal center and the radially outer flap edge of the primary seal. In such an embodiment, the secondary seal is continuously circular in shape with the at least one tab of the primary seal completely within the circle of the secondary seal and with the circular primary seal also being fully supported by the secondary seal but in the region outside the tab (s) radially surmounted the primary seal.

Such a configuration simplifies the introduction of the closure seal in a screw cap. A circular secondary seal introduced into the intermediate space between projection and bead in a screw cap ensures homogeneous support of the secondary seal on the inside of the closure shell near the top plate.

In one embodiment, the closure seal, in combination with a closure lid and a container that can be closed by the closure lid, has the above-mentioned features. The closure cap may be a screw cap, a so-called slip-on closure or a snap closure and has a top plate and an at least approximately cylindrical shell with at least one radially inwardly projecting projection or ridge on the inside behind the initial entire seal and after separation between the primary seal and secondary seal only the latter can be kept. Insofar as the closure cap is not a screw cap, the sealing shell does not necessarily have Could be cylindrical, but only need to be suitable to keep the seal or the secondary seal behind one or more projections or a bead safely.

Further advantages, features and possible applications of the present invention will become apparent from the following description of preferred embodiments and the associated figures.

FIG. 1 shows a schematic view of a closure seal according to the invention;

Figure 2 is a plan view of a closure seal according to one embodiment of the present invention;

Figure 3 is a perspective line drawing of a closure seal according to the invention with two tabs;

Figure 4 is a perspective view of an embodiment of the present invention with four tabs;

Figure 5 is a schematic view of an inventive combination of a closure seal, a screw cap and a container. Figure 1 is a schematic view of a closure seal 1 according to the invention, which is designed in the plan view substantially circular. The closure seal 1 has a secondary seal 2 and below a release layer 7 made of a polymer. Below the separating layer 7, a primary seal 3 is arranged, which has a PET layer, an aluminum layer and a heat seal adhesive in this order. The primary seal 3 is detachably connected to the secondary seal 2 by the separating layer 7.

Next, the primary seal 3 has a radially extending tab 8, the supernatant in the radial direction is 2 to 3 mm in size. It should be expressly pointed out that all the figures shown are not necessarily to be regarded as true to scale illustrations, but are intended to explain the inventive idea and the principle of operation, even if the proportions and dimensions shown are quite realistic.

Visible, the secondary seal 2 is adapted to the shape of the primary seal 3, so that both the separating layer 7 and the secondary seal 2 also have a tab. In the joined state, ie when all the layers are superimposed, the tab 8 and the circular area F of the primary seal 3, which are only shown in FIGS. 2 and 4 by way of example is highlighted by hatching for the sake of illustration, completely covered by the secondary seal 2. All layers of the closure seal 1 are thus congruent to each other.

The tab 8 of the closure seal 1 is arranged around the center of a circular surface F ring portion, so that the outer contour of the tab 8 is designed circular arc. The circular surface F is therefore defined in all embodiments by the maximum radius on the primary seal projected circular area and thus does not cover the tab (s), but all radially within the tab (s) lying areas. FIG. 2 shows a schematic plan view of a closure seal 1 according to a preferred embodiment of the present invention. The closure seal 1 has four tabs 8, which are arranged at equal angular distances from one another along the closure seal circumference. Each of these tabs 8 can be used to detach the primary seal 3 from a container opening. By virtue of this homogeneous distribution of the tabs 8, it is also possible to achieve that the primary seal 3 can be detached from a container opening alternately from several directions.

In order to provide a large area for gripping the tab 8, the tabs 9 are designed in the shape of a ring around the center of the closure seal 1 and each extend over an angular segment of 60 °. The tabs 8 extend in the radial direction to z. B. 2.5 mm beyond the substantially circular closure sealing surface addition.

FIG. 3 shows a perspective view of a closure seal 1 of the present invention having two tabs 8 arranged diametrically opposite and along the closure seal periphery. The projection of the tabs 8 extending in the radial direction over the substantially circular closure sealing surface is 3 mm, in which embodiment the secondary seal 2 and the separating layer 7 are configured substantially circular and completely cover the primary seal 3. Due to the substantially circular shape of the secondary seal 2 and the separating layer 7, these also define circumferential sections on the edge of the closure seal 1, under which no primary seal 3 is arranged. The continuous circular shape of the secondary seal 2 allows a simple centering of the closure seal 1 in a screw cap and also helps the secondary seal 2 over the entire circumference of the closure seal 1 uniformly against the inner closure shell surface and a radial projection or bead support thereof. FIG. 4 shows a perspective view of a preferred embodiment of the present invention with four tabs 8. The essentially circular closure seal 1 has a secondary seal 2 and below it a release layer 7 and a primary seal 3. The secondary seal 2 in this case is a polyethylene foam layer which is sandwiched by two polypropylene layers 10, the PE foam layer having a density of between 150 and 500 kg / m ³ , e.g. B has 300 kg / m ³ and the secondary seal has a thickness between 3 and 0.5 mm.

The primary seal 3 has a polyethylene terephthalate layer 4 with a thickness of 12 μηη, a layer with a print 1 1, an aluminum layer 5 with a thickness of 20 μηη and a heat seal adhesive 6 in this order. The amount of applied heat seal adhesive 6 is 25 g / m ² .

All layers of the closure seal 1 are congruent to each other, so that the secondary seal 2 and the separating layer 7 are adapted to the shape of the primary seal 3. Visible, the tabs 8 are arranged along the Verschlußssiegelumfangs at equal angular intervals and extend in the radial direction beyond the circular surface F of the closure seal 1 addition. The extending in the radial direction projection of the tabs 8 is z. B. 4 mm. FIG. 5 shows a schematic representation of a combination according to the invention of a closure seal 1, a screw cap 13 and a container 12, the body of the container 12 being reproduced only incompletely. The screw cap 13 has a closure shell 14 and a top plate 15, the closure shell 14 near the top plate 15 on the inside has a circumferentially at least partially extending bead 16, which is indicated in the drawing with a dashed line. Between the bead 16 and the top plate 15, the closure seal 1 is arranged. After sealing the container opening 17 and first turning off the screw cap 13, the secondary seal 2 and the separating layer 7 remain in the screw cap 13, while the primary seal 3 continues to close the container opening 17.

The diameter of the substantially circular closure seal 1 is adapted to the outer diameter of the container opening d, so that the circular surface F of the primary seal 3 completely closes the container opening 17. So that the primary seal 3 can be bonded to the applied hot-seal adhesive 6 on the upper edge of the container opening 19, the diameter of the substantially circular primary sealing surface F corresponds to the Outer diameter of the container opening 17, ie with the upper edge 19 of the container opening 17th

The extending in the radial direction and over a peripheral portion tab 8 has a radial projection, which corresponds to half the amount of the difference between the inner diameter D of the screw cap 13 and the outer diameter d of the container opening 17. Since the secondary seal 2 in this case is not adapted to the shape of the primary seal 3 but forms a larger circle which corresponds to the inside diameter D of the closure jacket immediately below the top plate and above the bead, the secondary seal between the bead 16 and the top plate 15 can the screw cap 13 are arranged. The bead 16 prevents unwanted falling out of the secondary seal 2, wherein the secondary seal 2 and the separating layer 7 between the bead 16 and top plate 15 are arranged. The flap 8, which extends in the radial direction, can also initially be arranged between the bead 16 and the top plate 15 with the secondary seal 2, without the tab 8 being bent over and extending over the bead 16 or partially over the thread 18.

When the screw cap 13 is unscrewed from the container neck, an axial force acts in the direction of the top plate 15 through which the primary seal 3 glued on the upper edge 19 of the container opening 17 is separated from the secondary seal 2 along the separating layer 7. The separate from the secondary seal 2 and thus relatively flexible tab 8 slides over the bead 16 away.

For complete release of the primary seal 3 from the container opening 17, the primary seal 3 can be gripped on the tab 8 and be detached from the container opening 17 by the application of a pulling force as a whole.

For purposes of the original disclosure, it is to be understood that all such features as will become apparent to those skilled in the art from the present description, drawings and dependent claims, even though concretely described only in connection with certain features, both individually and separately can also be combined in any combinations with other features or feature groups disclosed herein, unless this has been expressly excluded or technical conditions make such combinations impossible or pointless. On the comprehensive, explicit presentation of all conceivable combinations of features and the emphasis on independence The individual characteristics of each other is omitted only for the sake of brevity and readability of the description.

LIST OF REFERENCE NUMBERS

1 closure seal

2 secondary seal

3 primary seal

4 polymer or PET layer

5 aluminum layer

6 heat seal adhesive

7 separating layer

8 tab

9 PE or PP foam layer

10 PP or PE or PET layer

1 1 imprint

12 containers

13 screw cap

14 sealing coat

15 head plate

16 bead or projection, holding bead

17 container opening

18 threads

19 edge of the container opening

d outer diameter of the container opening

D Inner diameter of the screw cap

Claims

S h e c tio n s p o rc e s

A substantially circular closure seal (1) for sealing a container (12) having a secondary seal (2) and including a primary seal (3) having a circular surface (F) with a radius (R) for adhering to the upper edge of a container opening in which the primary seal (3) and the secondary seal (2) are detachably connected to one another by a separating layer (7), the secondary seal (2) being adapted to the shape of the primary seal (3), the primary seal (3) being at least one in has radially extending tab (8),

characterized in that

the primary seal (3) has a plurality of lugs (8) projecting over the edge of the circular surface along the closure seal circumference at equal angular intervals and having the shape of a ring section around the center of the closure seal (1) immediately outside the circular surface (F) and whose radial projection over the circular surface (F) in the radial direction is between 1 mm and 5 mm, preferably between 2 and 4 mm.

Closure seal (1) according to claim 1, characterized in that the circular surface is that which can be projected onto the primary seal circular surface, which has a maximum radius without projection over the edge of the primary seal (3).

Closure seal (1) according to one of claims 1 to 2, characterized in that the primary seal (3) has four lugs (8) arranged at equal angular intervals along the closure seal circumference.

Closure seal (1) according to one of claims 1 to 3, characterized in that extending the at least one tab (8) in the circumferential direction over an angular segment of 10 ° to 60 °, preferably from 25 ° to 45 °.

Closure seal (1) according to one of claims 1 to 4, characterized in that extending the at least one tab (8) in the circumferential direction over a length of 5 mm to 60 mm, preferably from 10 mm to 30 mm. Closure seal (1) according to one of claims 1 to 5, characterized in that the secondary seal (2) consists of a relative to the primary seal thicker and stiffer material.

Closure seal (1) according to one of Claims 1 to 6, characterized in that the secondary seal (2) has a PE or PP foam layer (11), which is sandwiched by two polymer layers (10) and has a density of between 150 and 500 kg / m ³ , wherein the total thickness of the layer composite of the secondary seal (2) is at most 3.0 mm and a minimum of 0.5 mm.

Closure seal (1) according to any one of claims 1 to 7, characterized in that the primary seal consists of an aluminum layer (5) whose upper side is coated with a polymer layer, preferably a PET layer, and the underside thereof with a heat seal adhesive.

Closure seal (1) according to claim 8, characterized in that the aluminum layer between 10 and 50 μηη, preferably about 20 μηη thick, the PET layer hisses 12 and 36 μηη, and the heat-sealing layer between 3 and 70 μηη thick.

Closure seal (1) according to one of claims 1 to 7, characterized in that for bonding the primary seal (3) with a container opening, a heat-seal adhesive (6) is applied to the primary seal (3) with a surface density between 5 to 65 g / m ² ,

Closure seal (1) according to one of claims 7 to 10, characterized in that the PET layer (4) is between 12 and 36 μm thick.

Closure seal (1) according to one of claims 1 to 1 1, characterized in that the secondary seal (2) is circular, wherein the radius of the secondary seal (2) corresponds to the distance between the center of the circular surface and the radially outer tab edge. Combination of a substantially circular closure seal (1), a closure cap (13) with a closure shell (14) and a top plate (15), wherein the closure shell (14) has on its inside near the top plate (15) at least one radially extending projection (16) and the closure seal (1) between the top plate (15) and the projection (16) is arranged and covers the inner surface of the top plate at least radially within the projection, and a through the closure cover (13) closable container (12) a circular container opening (17), the container opening (17) having an outer diameter d and the closure jacket (14) between the projection (16) and the top plate (15) having an inner diameter D, the closure seal (1) having a secondary seal (17) 2) and including a primary seal (3) for adhering to the edge of the container opening, wherein the primary seal (3) and the Sekundärdichtu ng (2) are releasably connected together by a separating layer (7),

characterized in that

the primary seal (3) has a plurality of lugs (8) projecting over the edge of the circular surface along the closure seal circumference at equal angular intervals and having the shape of a ring section around the center of the closure seal (1) immediately outside the circular surface (F) , And the projection in the radial direction at least 1 mm and a maximum of half the difference between the outer diameter d of the container opening (17) and the inner diameter D of the closure shell (14).

Combination according to claim 13, characterized in that the closure seal (1) is a closure seal (1) according to one of claims 1 to 15.

Combination according to claim 13 or 14, characterized in that the projection extends over the entire inner circumference of the closure jacket (14).

Combination according to one of claims 13 to 15, characterized in that a plurality of projections (16) over the inner circumference of the closure jacket (14) are distributed.

Combination according to one of claims 13 to 16, characterized in that the tab (8) or the tabs (8) extend in the radial direction over the same portion as the projection (16) or the plurality of projections (16). Combination according to one of claims 13 to 17, characterized in that primary seal (3) and secondary seal (2) are both circular and have a diameter (D) which is greater by 1 to 5 mm, preferably 2 to 4 mm Outer diameter (d) of the container opening (17).

Combination according to one of claims 13 to 18, characterized in that the closure lid is a screw cap

20. A combination according to any one of claims 13 to 18, characterized in that the Versch l ussdeckel ei n Stü l pverschluss or a snap closure