DE202011050481U1 - closure seal - Google Patents

Abstract

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), characterized in that the primary seal (3) has at least one lug (8) extending in the radial direction, whose radial projection over the circular area (F) in the radial direction is between 1 mm and 5 mm, preferably between 2 and 4 mm.

Description

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 is 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 adhering to the edge 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 cardboard or a sandwich of two polypropylene layers, short PP layer, limited polyethylene foam layer, short PE foam layer. With the PP layers, the pores of the foam layer are sealed 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. B. may have the shape of at least partially circumferentially extending bead or consists 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 larger than the defined by the one or more projections the free inner diameter of the closure shell, so that the corresponding radially outer portions of the closure seal lie in the radial region between the inner diameter D of the closure shell and the free diameter of the closure shell defined by the projection or projections. 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 entails the risk of the container contents underneath being damaged by the tool used, e.g. Knife or scissors, damaged or contaminated. Also, remnants of the cut or torn primary seal often adhere to the edge of the container opening, which interfere with removal of the product.

To avoid these problems, tabs have already been proposed in the prior art, which are mounted on the primary seal top and with the help of the primary seal should be deducted 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 extending in the radial direction tab, the supernatant in the radial direction a minimum of 1 mm and a maximum of half the difference between the outer diameter d of the container opening and the inner diameter D of Closure coat corresponds.

A tab with such a protrusion in the radial direction allows after unscrewing the cap and the resulting separation of the secondary seal from the primary seal a simple and secure gripping the tab, so that the primary seal can be removed as a whole 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 radially in the area between the projection or bead and the Head plate extends, whereby a bending of the tab during insertion of the closure seal and thus accidental sticking of the tab to the rest of the 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 circumference. 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 along the closure seal circumference at equal angular intervals. 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 portion 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 engagement surface for the detachment of the primary seal can additionally extend in the circumferential direction sufficiently far (eg up to 270 °), 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 force applied to detach the primary seal tensile force is distributed to the angle segment or the respective peripheral portion and any shearing force peaks at 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 congruent with the secondary seal must extend over 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 microns, preferably 20 microns thick and thicker than the adjacent PET and hot melt adhesive layers. A 20 μm thick Aluminum layer has sufficient stability with a low weight, this aluminum layer receives an improved tear strength by the additionally applied PET layer.

In one embodiment, the PET layer is 12 μm 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 fully supported by the secondary seal but in the regions outside the tab (s) the primary seal protrudes radially.

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 jacket near the top plate.

In one embodiment, the closure seal, in combination with a closure lid and a container closable by the closure lid, has the aforementioned 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 its inside behind the initial entire seal and after separation between the primary seal and secondary seal only the latter can be kept. As far as the closure cap is not a screw cap, the sealing shell does not necessarily have to be cylindrical, but only has to be suitable for securely holding the seal or the secondary seal behind one or more protrusions or a bead.

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

Show it:

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

2 a plan view of a closure seal according to an embodiment of the present invention;

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

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

5 a schematic view of an inventive combination of a closure seal, a screw cap and a container.

1 is a schematic view of a closure seal according to the invention 1 , which is configured substantially circular in plan view. The closure seal 1 has a secondary seal 2 and below that a release layer 7 from a polymer. Below the separation layer 7 is a primary seal 3 having a PET layer, an aluminum layer and a heat seal adhesive in this order. The primary seal 3 is through the separation layer 7 detachable with the secondary seal 2 connected.

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

Recognizable is the secondary seal 2 the shape of the primary seal 3 adjusted so that both the release layer 7 as well as the secondary seal 2 also have a tab. In the assembled state, ie when all layers are superposed, are the tab 8th and the circular area F of the primary seal 3 that only in the 2 and 4 by way of example and for clarity by hatching, from the secondary seal 2 completely obscured. All layers of the closure seal 1 are thus congruent to each other.

The tab 8th the lock seal 1 is a ring portion arranged around the center of a circular surface F, so that the outer contour of the tab 8th is designed circular arc. The circular area F is thus in all Defined 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.

In the 2 is 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 8th on, which are arranged along the Verschlussssiegelumfangs at equal angular intervals to each other. Each of these tabs 8th can replace the primary seal 3 be used by a container opening. Through this homogeneous distribution of the tabs 8th can also be achieved that alternately from several directions the primary seal 3 can be detached from a container opening.

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

The 3 shows a perspective view of a closure seal 1 the present invention with two tabs 8th which are arranged diametrically opposite and along the closure seal circumference. The projection of the tabs extending in the radial direction over the substantially circular closure sealing surface 8th is 3 mm, in this embodiment, the secondary seal 2 and the separation layer 7 are configured substantially circular and the primary seal 3 completely obscure. Due to the substantially circular shape of the secondary seal 2 and the release layer 7 These also define peripheral portions at 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 easy centering of the lock seal 1 in a screw cap and also helps the secondary seal 2 over the entire circumference of the closure seal 1 evenly against the inner skirt surface and a radial projection or bead support the same.

In 4 Figure 4 is a perspective view of a preferred embodiment of the present invention with four tabs 8th shown. The essentially circular closure seal 1 has a secondary seal 2 and below that a release layer 7 as well as a primary seal 3 on. The secondary seal 2 in this case is a sandwich of two polypropylene layers 10 limited polyethylene foam layer, 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 microns, a layer with a print 11 , an aluminum layer 5 with a thickness of 20 microns and a heat seal adhesive 6 in that order. The amount of heat-seal adhesive applied 6 is 25 g / m ² .

All layers of the closure seal 1 are congruent to each other, leaving the secondary seal 2 and the separation layer 7 the shape of the primary seal 3 are adjusted. The tabs are recognizable 8th are arranged along the Verschlussssiegelumfangs at equal angular intervals and extend in the radial direction over the circular surface F of the closure seal 1 out. The protruding in the radial direction supernatant of the tabs 8th is z. B. 4 mm.

In 5 is a schematic representation of a combination of a closure seal according to the invention 1 , a screw cap 13 and a container 12 where the body of the container 12 is reproduced only incompletely. The screw cap 13 has a closure coat 14 and a headstock 15 , wherein the closure coat 14 near the top plate 15 on the inside a circumferentially at least partially extending bead 16 has, which is indicated in the drawing with a dashed line. Between the bead 16 and the top plate 15 is the closure seal 1 arranged. After sealing the container opening 17 and first turning off the screw cap 13 remain the secondary seal 2 and the separation layer 7 in the screw cap 13 while the primary seal 3 the container opening 17 continues to close.

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 the container opening 17 completely closes. So that the primary seal 3 with the applied heat seal adhesive 6 on the upper edge of the container opening 19 can be glued, 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 the container opening 17 ,

The in the radial direction and over a peripheral portion extending tab 8th has a radial projection, which is 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 equivalent. Because the secondary seal 2 in this case, the shape of the primary seal 3 is not adapted but forms a larger circle, which corresponds to the inner diameter D of the closure shell immediately below the top plate and above the bead, the secondary seal between the bead 16 and the top plate 15 of the screw cap 13 to be ordered. The bead 16 prevents unwanted falling out of the secondary seal 2 , where the secondary seal 2 and the separation layer 7 between bead 16 and headstock 15 are arranged. The extending in the radial direction tab 8th can with the secondary seal 2 initially also between the bead 16 and the top plate 15 be arranged without the tab 8th is bent over and over the bead 16 or partially over the thread 18 extends.

When unscrewing the screw cap 13 from the container neck, an axial force acts in the direction of the top plate 15 through the one on the top edge 19 the container opening 17 glued on primary seal 3 along the separation layer 7 from the secondary seal 2 is disconnected. It slides from the secondary seal 2 separate and thus relatively flexible tab 8th over the bead 16 time.

For complete release of the primary seal 3 from the container opening 17 can be the primary seal 3 at the flap 8th to be gripped and from the container opening 17 be replaced by the application of a tensile 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 any combination with other of the features or feature groups disclosed herein are combinable, unless this has been expressly excluded or technical conditions make such combinations impossible or pointless. The comprehensive, explicit presentation of all conceivable combinations of features and the emphasis on the independence of the individual features from 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

 Interface

8th

 flap

9

 PE or PP foam layer

10

 PP or PE or PET layer

11

 imprint

12

 container

13

 screw

14

 closure shell

15

 headstock

16

 Bead or ledge, holding bead

17

 container opening

18

 thread

19

 Edge of the container opening

d

 Outer diameter of the container opening

D

 Inner diameter of the screw cap

Claims (23)

Essentially circular closure seal ( 1 ) for closing a container ( 12 ), which has a secondary seal ( 2 ) and below a primary seal ( 3 ) having a circular area (F) with a radius (R) for adhering to the upper edge of a container opening, the primary seal ( 3 ) and the secondary seal ( 2 ) by a separating layer ( 7 ) are detachably interconnected, characterized in that the primary seal ( 3 ) at least one extending in the radial direction tab ( 8th ) 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 and which is projecting beyond the edge of the primary seal (without protrusion). 3 ) has a maximum radius. Closure seal ( 1 ) according to claim 1 or 2, characterized in that the secondary seal ( 2 ) the shape of the primary seal ( 3 ) is adjusted. Closure seal ( 1 ) according to one of claims 1 to 3, characterized in that the primary seal ( 3 ) a plurality along the Verschlußssiegelumfangs at equal angular intervals arranged over the edge of the circular surface protruding tabs ( 8th ) having. Closure seal ( 1 ) according to one of claims 1 to 4, characterized in that the primary seal ( 3 ) four tabs arranged along the closure seal circumference at equal angular intervals ( 8th ) having. Closure seal ( 1 ) according to one of claims 1 to 5, characterized in that the at least one tab ( 8th ) around the center of the closure seal ( 1 ) is immediately outside the circular surface (F) extending ring section Closure seal ( 1 ) according to one of claims 1 to 6, characterized in that the at least one tab ( 8th ) extends 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 7, characterized in that the at least one tab ( 8th ) 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 8, characterized in that the secondary seal ( 2 ) consists of a relation to the primary seal thicker and stiffer material. Closure seal ( 1 ) according to one of claims 1 to 9, characterized in that the secondary seal ( 2 ) a sandwich of two polymer layers ( 10 ) limited PE or PP foam layer ( 11 ) with a density of between 150 and 500 kg / m ³ , the total thickness of the layer composite of the secondary seal ( 2 ) is at most 3.0 mm and at least 0.5 mm. Closure seal ( 1 ) according to one of claims 1 to 10, characterized in that the primary seal of an aluminum layer ( 5 ), the upper side of which is coated with a polymer layer, preferably a PET layer, and the underside of which is coated with a heat seal adhesive. Closure seal ( 1 ) according to claim 11, characterized in that the aluminum layer between 10 and 50 microns, preferably about 20 microns thick, the PET layer hiss 12 and 36 microns, and the heat-sealing layer between 3 and 70 microns thick. Closure seal ( 1 ) according to one of claims 1 to 10, characterized in that for gluing the primary seal ( 3 ) with a container opening a heat seal adhesive ( 6 ) on the primary seal ( 3 ) is applied with a surface density between 5 to 65 g / m ² . Closure seal ( 1 ) according to one of claims 11 to 13, characterized in that the PET layer ( 4 ) is between 12 and 36 μm thick. Closure seal ( 1 ) according to one of claims 1 to 14, 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 lid ( 13 ) with a sealing jacket ( 14 ) and a head plate ( 15 ), wherein the closure sheath ( 14 ) 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 lead ( 16 ) is arranged and covers the inner surface of the top plate at least radially within the projection, as well as a through the closure cap ( 13 ) closable container ( 12 ) with a circular container opening ( 17 ), wherein the container opening ( 17 ) an outer diameter d and the sealing jacket ( 14 ) between the projection ( 16 ) and the top plate ( 15 ) has an inner diameter D, wherein the closure seal ( 1 ) a secondary seal ( 2 ) and below a primary seal ( 3 ) for adhering to the edge of the container opening, wherein the primary seal ( 3 ) and the secondary seal ( 2 ) by a separating layer ( 7 ) are detachably interconnected, characterized in that the primary seal ( 3 ) at least one extending in the radial direction tab ( 8th ), the projection in the radial direction of at least 1 mm and at most half the amount of the difference between the outer diameter d of the container opening ( 17 ) and the inner diameter D of the closure shell ( 14 ) corresponds. Combination according to claim 16, characterized in that the closure seal ( 1 ) a closure seal ( 1 ) according to any one of claims 1 to 15. Combination according to claim 16 or 17, characterized in that the projection extends over the entire inner periphery of the closure shell ( 14 ). Combination according to one of Claims 16 to 18, characterized in that a plurality of projections ( 16 ) over the inner circumference of the closure shell ( 14 ) are distributed. Combination according to one of Claims 16 to 19, characterized in that the tab ( 8th ) or the tabs ( 8th ) extend in the radial direction over the same section as the projection ( 16 ) or the plurality of projections ( 16 ). Combination according to one of Claims 16 to 20, characterized in that primary seals ( 3 ) and secondary seal ( 2 ) are both circular and have a diameter (D) greater by 1 to 5 mm, preferably 2 to 4 mm, than the outer diameter (d) of the container opening ( 17 ). Combination according to one of claims 16 to 21, characterized in that the closure lid is a screw cap Combination according to one of claims 16 to 21, characterized in that the closure lid is an inverted flap closure or a snap closure

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