EP1572553A1

EP1572553A1 - Insert for a pressurised container of liquid

Info

Publication number: EP1572553A1
Application number: EP03780127A
Authority: EP
Inventors: Bernd Ulllmann
Original assignee: Ball Packaging Europe GmbH
Current assignee: Ardagh Metal Beverage Germany GmbH
Priority date: 2002-12-16
Filing date: 2003-12-05
Publication date: 2005-09-14
Anticipated expiration: 2023-12-05
Also published as: DE10258791A1; DE50309748D1; RS50947B; PL376003A1; PL201442B1; WO2004054896A1; EP1572553B1; RU2330798C2; ES2305543T3; DE10258791B4; RS20050463A; US8007880B2; ATE393741T1; US20060153956A1; RU2005114005A

Abstract

The invention relates to an insert that is to be added to a gas-pressurized liquid in a container. Said insert comprises a pressure-activated body with at least one cavity, said body being connected to a positioning device. According to the invention, (a) the pressure-activated body (4) comprises at least one opening (10) with a reduced diameter, which connects the cavity to the environment of the insert and is situated in a location that lies above the level of liquid when the insert is floating on said liquid and (b) the positioning device comprises a floating body (1, 2; 1, 2, 6) with a small opening (3), which is submerged in the liquid when the insert is placed on the latter, a ventilation opening (5), which communicates directly with the external environment (14) of the insert and a minimum volume (11), which when filled with liquid enables the insert to sink into the liquid. The inventive insert can be added to liquids that are sealed under pressure. It floats to the surface of said liquid, but sinks after a period of time. Its pressure-activated body is charged with the internal pressure of the sealed container and when the container of liquid is opened, said pressure is used in a known manner to achieve effects such as an improved foaming of beer or to mix a substance, which up to the point of opening has been stored separately in the container, with the liquid.

Description

Liquid container insert with time-determined positioning in a liquid under gas pressure

The present invention is directed to an inner container which seals a gas pressurized can or otherwise

Pressure vessels can be added ("Titan ic" widget or wedge). This inner container is an insert that can change the properties of the surrounding liquid when the pressure container is opened, e.g. promotes the formation of gas bubbles and thus possibly the formation of foam and / or releases an additive stored separately until the pressure container is opened, so that this additive can mix with the liquid before pouring out of the opened container. The use according to the invention is independent of the type of the surrounding liquid and of its intended use; however, it is also particularly suitable for drinks that are filled, for example, in beverage cans.

Various uses are known in the beverage industry which change the properties of a beverage the moment the consumer opens the packaging. For example, it has long been known to use inner containers in cans for storing carbonated beverages and especially beer, which can be filled with gaseous or liquid nitrogen or another gas before the can is closed. These inner containers should e.g. ensure that foaming beverages such as beer develop a nice, stable head when opening the can, or they can be designed to mix an ingredient stored in the can separately from the beverage at the time the can is opened, the first example is known to the expert under the term "widget", the second under the term "wedge" or the brand "FreshCan".

As a basic feature, these active operations generally have in common that they are "loaded" with the pressure that builds up in the headspace of the packaging after the packaging has been closed. They are then activated by the sudden drop in pressure when the beverage container is opened and the resulting pressure difference between a gas space in its interior and its surroundings. In order to achieve this, their interior is generally in connection with the liquid surrounding them in such a way that, when the closed can is filled, the gas present in the inner container cannot escape into the surrounding liquid. There are a large number of for this in the prior art. Proposals. For example, the inner container can have at least one and in particular have two openings with only a small diameter, which is dimensioned such that, when the container is filled and closed, the surface tension of the liquid prevents gas bubbles from escaping. This effect is known as the so-called "gas bubble point effect". Gas containers with only one such opening are described, for example, in EP 448 200 A1 and EP 520 646 A1, and those with two of these openings in WO 95/08493. Openings with diameters dimensioned in this way are also referred to below as openings with a reduced diameter.

It has been proposed both to provide the inserts floating on or in the liquid and to lock them in the container. According to a proposal of WO 95/08493, a widget provided with two openings with a reduced diameter can be attached to the bottom of a beverage can. WO 91/07326 proposes, inter alia, that the gas container should have flexible arms with flanges which fix the gas container at a predetermined position in an upper or middle region of the container by means of a press fit. WO 95/05325 suggests providing a gas container that floats on the liquid.

So that all such inserts can perform their function optimally, they have to meet several conditions: at the time the outer container is closed and for some time afterwards, the gas space of the insert should at least be connected to the gas space via an opening, which is when the outer space is closed Container above the liquid level is formed ("head space"). In this way, a pressure equalization between the two gaseous compartments - and thus a pressure loading of the insert - is effected without a part of its volume being filled with liquid due to the contraction of the gas in the insert and thus the desired effect in its quantity being reduced , This is often achieved by providing the or an opening with a reduced diameter relatively far down on the insert and fixing it to the bottom of the liquid container. After filling and closing, the container is then turned upside down until the pressure equalization mentioned has been achieved. However, since there is often a risk that a certain amount of liquid will still penetrate, either the geometry of the insert must prevent this liquid from running into an area that covers the opening and thus when the container is re-placed in its original position intended for opening represents a barrier to the later gas escape, as is proposed, for example, in EP 520 646, or else it becomes a second one, in the upper one. Area of the widget arranged opening is also provided with reduced external dimensions. What is unfortunate about such inserts is not only the additional step of turning them upside down after closing them, but also to a particular extent the fact that the insert has to be attached to the inside bottom of the can before it is filled. This is not only technically, but also logistically very complex. If it is attached with an adhesive, care must also be taken to ensure that it is toxicologically harmless, tasteless and also stable in the long term with respect to the surrounding liquid.

Floating inserts must be designed in such a way that when the beverage container is opened, the gas must not escape through the opening in the insert that connects the gas space above the beverage level to the gas space in use, since in such a case the effect would "fizzle out". Therefore, at least this opening must be designed as a valve that only allows the entry, but not the exit of gas. Furthermore, such widgets must have a lower opening which is immersed in the liquid and through which the gas can escape again when the beverage container is opened. Such widgets are described, for example, in WO 95/05326 and in EP 1 055 614 A1. However, this principle only works if it is safely prevented that even small amounts of

Penetrate liquid in the gas container. In addition, the effect achieved is only moderate because the gas must escape downwards when the pressure drops when the outer liquid container is opened. This also entails the risk that the widget rotates in the liquid when the can is opened until the gas outlet is no longer immersed in the liquid.

An alternative is provided in WO 97/00214, the floating widget of which requires an orientation device which inevitably gives it a given orientation, and in which several passage channels ensure that gas from the gas space located above the liquid level in the liquid container enters the widget and during Opening the liquid container and the associated drop in pressure down into the liquid can escape again. Despite this orientation aid, this widget can rotate unintentionally, and its construction is also excessively complex.

In addition to widgets permanently installed in the liquid container and those that float on top of the liquid, it has also been proposed to use widgets that float on the liquid first, rotate and then sink after some time should be able to. For example, WO 95/04688 discloses a capsule with two chambers, which has a first opening which is immersed in the liquid and which is connected via a tube or the like to the upper chamber in the capsule and can penetrate through the liquid. When this liquid enters, gas is displaced from the upper chamber (ballast chamber), which passes into the lower chamber (pressure chamber) via a second opening, which must be protected against overflowing with this liquid. This communicates via a further tube, which also extends through the intermediate wall between the two openings, with an outlet opening on the top of the capsule, which is in contact with the gas space of the liquid container. A similarly complicated proposal can be found in WO 95/03982. Since in these widgets the pressure chamber and the ballast chamber communicate with each other via a pressure compensation tube, the outside of the ballast chamber must not have a direct opening to the outside, otherwise liquid could get into the pressure chamber.

From the abundance of prior art on this subject, it can be seen that a large number of proposals for solving the above problem have been presented, but all of them are imperfect or involve too much technical effort.

The so-called wedges use the same principle as the widgets, but this is used additionally or alternatively to be able to store an ingredient separately during the storage of the liquid in the liquid container, in such a way that it automatically opens when the container is opened and during the process resulting pressure drop mixed with the liquid surrounding the inner container. For example, WO 99/54229 discloses an inner container with two chambers, one chamber of which has an opening with a reduced diameter which keeps the interior of this chamber in communication with the outside environment, so that it is as described above for the widgets with that in a beverage container prevailing gas pressure can be applied. This chamber is separated by a gas and liquid impermeable inner wall from a second chamber, which is intended for storing a substance. The latter, for example a liquid or solid flavor carrier or a food supplement, should mix with the surrounding beverage when the beverage can is opened. The container having the two chambers is composed of an upper part and a lower part in such a way that when the beverage can is opened and the pressure loss that arises, the pressure difference that arises develops forces that are greater than the connection between the both parts, the chamber housing the additive being "blown up" so that its ingredient pours into the surrounding beverage liquid.

The use of wedges presents similar difficulties to those described above for the widgets. Gluing to the floor before filling the beverage liquid requires considerable effort and requires toxicologically harmless, odorless and tasteless adhesives that are stable in storage and drinks. If they are designed as floating wedges, the problems mentioned above also remain.

The object of the present invention is to provide an insert for containers with liquids under pressure, in particular beverages, located therein, which, regardless of its intended use and consequently regardless of how it is designed inside, has a gas compartment which, when closed of the liquid container communicates reliably via an opening with a reduced diameter with the gas space of the liquid container created after the closure, while at the later point in time when the liquid container is opened, said opening is to be surrounded by liquid such that the pressure difference that occurs suddenly when opening the can have the desired effect. This use can be provided to improve gas bubble formation and / or to store a second ingredient, but also for other purposes.

This object is achieved by an insert which has a pressure-activatable body having at least one cavity in conjunction with a positioning device, where (a) the pressure-activatable body has at least one opening with a reduced diameter which connects the cavity to the surroundings of the insert and which is located at a location which, when the insert is floating on a liquid, lies above the liquid level and (b) the positioning device comprises a floating body which has a small-dimensioned opening which at least plunges into the insert when the insert is placed on a liquid and which communicates directly with the external environment of the insert, and has a minimum volume that ensures the insert sinks into the liquid when it is full. The attached figures show specific configurations of the insert according to the invention, namely:

FIG. 1 shows an insert with a floating body in the form of a boat,

FIG. 2 shows an insert with a floating body in the form of a covered boat (“submarine”),

FIG. 3 shows an insert whose pressure-activatable body is a single-chamber widget into which an additional weight has been introduced,

FIG. 4 shows an insert whose body which can be activated by pressure is a two-chambered wedge into which an additional weight has been introduced, and

Figure 5 shows a specific possibility, such as an insert according to Figure 4 from two

Components can be composed that separate due to the pressure drop when opening the beverage container and thereby release the contents of the product chamber.

The expression "small-sized opening" is not to be understood as the same as the expression "opening with reduced diameter". Rather, the small-sized opening is one that allows liquid to pass through it, but the passage should be so slow by the choice of small dimensions that the liquid floods the float in the minute range or even above. The person skilled in the art can easily determine the dimensions of this opening on the basis of his knowledge and simple experiments; Based on the example, he is also given suitable parameters for this. The dimensions for aqueous liquids and hydrophobic materials of the float, such as polypropylene, are preferably in the range from approximately 0.5 to 2 mm, preferably 1-1.5 mm.

In addition to the above-mentioned openings, the insert according to the invention has (at least) one ventilation opening. The expression "ventilation opening" implies that this opening of the floating body enables gas to escape. When the insert according to the invention is put on, it is therefore preferably above the liquid level and in any case above the small-dimensioned opening, and it ensures in a simple manner that the gas contained therein can escape when the float is flooded. This vent can be completely free be designed. It can be formed, for example, in that the floating body has no cover or wall on its upper side. Instead, the floating body can also have one or more openings in a suitable height in one or more areas, but can otherwise be closed. The size of this opening (s) is naturally completely uncritical. It can be the same as that of the small-dimensioned opening explained above, but can also be above or below.

The expression “pressure-activatable body having at least one cavity” is intended to encompass all those bodies which, in the manner of a widget or wedge, have at least one cavity which communicates with the surroundings via (at least) one opening with a reduced diameter, as described above. It should be pointed out in particular that all bodies which have the required properties can be used as pressure-activatable bodies, irrespective of the intended use and also regardless of whether the liquid to be sealed in the outer liquid container is edible or serves other purposes. Above all, however, the invention is suitable for beverage packaging such as cans and here for the design of widgets having one or two openings with a reduced diameter with at least one hollow interior and for wedges which have at least two chambers, one of which is hollow and one or more Openings with a reduced diameter ensure pressure equalization and the second one is used to hold an additional substance such as a food supplement or flavoring.

The insert according to the invention is thrown into a liquid container before or after it is filled and immediately assumes a floating position due to the buoyancy forces inherent in the floating body. After filling, the liquid container is closed, possibly under pressure. The pressure that builds up in the gas space above the liquid level is balanced with the cavity in the pressure-activated body via the opening with a reduced diameter. The openings of reduced diameter known in the prior art allow suitable cavities to be pressurized within a period of generally about 10 to 300 seconds, and this period of time will of course also be required by the inserts according to the invention with the same construction. At the same time, liquid penetrates into the floating body through the small-dimensioned opening of the insert according to the invention, which lies below the liquid level. This opening will be like this dimensioned so that the float only fully fills up after the period required for the pressure loading has elapsed and thus the insert drops. If the liquid container is then opened later, the insert is located on the bottom of the liquid container, so that the opening with a reduced diameter is immersed in the liquid and can have its full effect.

The floating body is preferably arranged outside the pressure-activatable body.

In a particularly preferred embodiment, the floating body has the shape of a boat which carries the pressure-activatable body which has at least one cavity. In this embodiment, the insert is of course only introduced after the liquid has been poured into the liquid container, e.g. thrown in. The boat has a bottom and a circumferential side wall, which is designed such that the capacity of the boat with the pressure-activatable body located therein has the minimum volume required according to the invention. The pressure-activatable body can be fully inserted into the floating body. Alternatively, parts of the pressure-activatable body can simultaneously be parts of the boat. For example, the bottom of the pressure-activatable body can be part of the bottom of the boat, which extends further outwards and is completely surrounded by the said side wall. Instead or in addition, the pressure-activatable body can also have a part of the side wall in common with that of the boat. In this embodiment, which cannot be rotationally symmetrical, care must of course be taken to ensure that the

Weight distribution does not cause the insert to skew when placed on the liquid. After all, it would be e.g. it is also possible for the pressure-activatable body to run in a ring around the side wall of the boat, so that its outer side wall simultaneously represents the boat wall.

In a further preferred embodiment of the invention, the floating body has the shape of a closed cavity. For example, the boat as described above can be provided with a cover. This configuration has the advantage that the insert can be inserted into the liquid container at any time and that it can be thrown onto the liquid when it is subsequently introduced without fear that the floating body will be flooded ahead of time if it is accidentally tilted , In this embodiment, the cover also has one or several openings, which can be small, for example, to allow gas to escape from the filling float when sinking.

The one or more small-dimensioned openings can be located on the bottom and / or in the side wall of the floating body in all configurations. Only one of them must be arranged so that it is on the liquid below its level when the insert is swimming. With an additional opening (s) located higher up, the sinking of the insert can be accelerated if the floating body is already partially flooded.

The materials used for the pressure-activatable body, the floating body and possibly as an additive for mixing with the liquid on the one hand and the existing cavities on the other hand are selected in a suitable manner so that the application floats reliably when applied to the liquid when or after the liquid has filled up Float, however, drops reliably. A weight with the weight G can be provided to compensate for possible buoyancy forces. These buoyancy forces F are, for example:

Foichte = V aterial * (p-liquid "PMaterial) * rArchimedesil ⁼ « Floating body p-liquid 9 r ^" Archimedes.2 ⁼ « Body (P-liquid "P-body) 9

The weight G must be such that:

G> Foichte + F _Ar chimedes, 2 equation 1

G <Foichte + FArchimedes, 1 ⁺ FArchimedes. 2 Equation 2

This means that the insert, i.e. the entire object, swims when the floating body is not flooded, but sinks when it is flooded. Here, in consideration of the physical conditions fall in particular the density pκorper and the volume V K _ö body of the pressure-activated body into weight, which are therefore primarily be considered. This average density can be strongly influenced, for example, by the density of the additional substance with which a second chamber of a wedge can be filled and by the size of the cavity or cavities in the pressure-activatable body. If one applies the above inequalities to the widgets or wedges known in the prior art, the result is that they cannot meet the above conditions. For them, V = _Sch wimmkörper applies 0. So you meet the constraints for the floating and sinking according to Equations 1 and 2, neither will they not that pressure and time determined can be positioned.

With the present invention, as mentioned above, the gas bubble formation in a liquid which is sealed under gas pressure in a container can be improved when this container is opened. This is done using the following steps:

(a) filling the open container with the liquid,

(b) inserting an insert according to the invention into the container before or after filling the liquid, (c) closing the liquid container, if necessary by applying pressure to the

Gas space above the liquid in the liquid container with pressure, such that an excess pressure in comparison to the ambient pressure arises after the closure inside the liquid container,

(d) enabling slow pressure equalization between the interior of the at least one cavity in the insert and the gas space above the

Liquid level in the liquid container,

(e) lowering the insert to the bottom of the liquid container,

(f) opening a designated opening in the liquid container, causing a sudden drop in pressure in the liquid container to ambient pressure, and

(g) Letting gas bubbles escape from the cavity of the pressure-activatable body through the opening with reduced diameter.

In addition, the invention can be used to mix a substance stored separately in a container with a liquid in the container when the container is opened. This is done through the following steps:

(a) filling the provided additional cavity (8) of an insert according to the invention with the solid or liquid substance, (b) filling the open container with liquid,

(c) inserting the insert into the container before or after filling the liquid,

(d) closing the liquid container, if necessary by applying pressure to the gas space above the liquid in the liquid container, in such a way that after the sealing inside the liquid container an overpressure arises in comparison to the ambient pressure,

(e) enabling slow pressure compensation between the interior of the at least one cavity in the insert and the gas space above the liquid level in the liquid container,

(f) lowering the insert to the bottom of the liquid container,

(g) opening a designated opening in the liquid container, as a result of which a sudden drop in pressure in the liquid container to ambient pressure takes place, and (h) allowing the wall between the cavities (8) and (9) of the insert to rise through the opening in the cavity (9) Liquid container created excess pressure and release of the solid or liquid substance therein into the surrounding liquid.

The invention will be explained in more detail below with reference to figures and exemplary embodiments.

example 1

An insert has a pressure-activatable body 4 in the form of a widget, as shown for example in FIG. 3, which is in a boat-shaped. Float as in Fig. 1 or in a submarine-shaped float as shown in Fig. 2 is arranged. The floating body has a bottom 1 which is integrally connected to the bottom of the pressure-activatable body, as well as a wall 2 and is possibly a floating body 11 with a cover 6. The figures in this example are to be read in such a way that the components are rotationally symmetrical with respect to one vertical axis x. However, it should be pointed out that the geometry of the insert according to the invention can of course also be different, for example with a square, rectangular or polygonal plan, or else asymmetrically with respect to the axis x. The pressure-activatable body has a cavity with an internal volume of approximately 10 ml. It has been produced from polypropylene, which has a density of approximately 850 kg / m ³ . The reduced diameter of the opening 10 is approximately 0.25 mm, which means that the widget is fully loaded with the prevailing pressure after approximately 30 seconds when used in a beverage can, for example a beer can.

The floating body has a bottom diameter of approximately 40-50 mm and a height of approximately 10-20 mm. Less the widget contained therein, it thus has a net volume of around 22 ml. Its openings 3 and possibly 5 are small-dimensioned openings in the sense of the invention: they have diameters of approximately 1.5 mm. When the insert is placed on water, the float is flooded in about a minute.

In order to reduce the use, a weight 7 of approx. 17 g with a weight of 170 mN is arranged in the widget. For water with a density of approx. 1000 kg / m ³ and air as a surrounding gas with a density of approx. 0, the above equations result in:

Foic _h te = 4 * 10- ⁶ m ³ * (1000-850) kg / m ³ * 9.81 m / s ² FArchimedes.i = 22 * 10 ^' W * 1000kg / m ³ * 9.81 m / s ² F _A rchimede _S , 2 = 10 * 10 ^"6 m ³ * (1000-0) kg / m ³ * 9.81 m / s ²

The key buoyant forces result in:

F _D icht = 10 mN

F _A rchimedes, 1 = 215 lTlN And FArchimedes, 2 = 100 mN.

The constraints of Equations 1 and 2 are:

170 mN> 10 mN + 100 mN [Equation 1]

170 mN <10 mN + 100 mN + 215 mN [Equation 2] An insert with the dimensions and properties of this example thus fulfills the necessary conditions and can be used according to the invention as an insert with time-determined positioning. The weight is chosen so that the inequalities are met generously. Smaller side effects such as the surface tension of the water can therefore have no effect on the sinking behavior.

Example 2

FIG. 4 shows an insert whose pressure-activatable body is a wedge with a gas chamber 9, which communicates with the surroundings via an opening with a reduced diameter, and a product chamber 8. A weight 7 is introduced into the product chamber to increase the weight. The wedge is surrounded by a covered floating body ("submarine" floating body) 11, which has a first small-sized opening in its bottom and, for the purpose of pressure compensation, a second such opening in its cover. FIG. 5 shows an example of how such an insert can be made from only two components (without taking the weight into account). The bottom of the pressure-activated body and the bottom of the surrounding float are integrally formed from one piece, and the lower part of all side walls, the partition between gas chamber 9 and product chamber 8 in the wedge, the outer wall of the wedge and the outer wall of the float is in one piece molded this bottom, while the upper parts of all these side walls are integrally formed with the top of the wedge and the cover of the float. The connection of the side walls in the assembled insert can e.g. a snap connection, a frictional connection or a connection made of a not very strong adhesive, which is blown up by the suddenly occurring pressure difference between the gas space 9 and the environment and the product container when the liquid container is opened. Details on this can also be found in the description of WO 99/54229, in which two-chamber wedges of the type used here are basically described.

The configurations of this example can, but need not, be rotationally symmetrical.

Claims

Expectations

1. Insert for adding to a liquid under gas pressure in a liquid container, the insert having a pressure-activatable body having at least one cavity in connection with a positioning device, characterized in that

(a) the pressure-activatable body (4) has at least one opening (10) with a reduced diameter which connects this cavity to the surroundings of the insert and which is located at a point which, when the insert is floating on a liquid above the

Liquid level lies, and

(b) the positioning device has a floating body (1, 2; 1, 2, 6)

(i) a small-sized opening (3) when the insert is placed on a liquid, (ii) a ventilation opening (5) which is directly connected to the external environment

(14) of the insert communicates, and (iii) a minimum volume (11), which ensures that the insert sinks into the liquid when filled with liquid.

2. Use according to claim 2, characterized in that the floating body is arranged outside the pressure-activatable body.

3. Use according to claim 1 or 2, characterized in that the floating body has the shape of an upwardly open (1, 2) or at least partially covered boat (1, 2, 6), and the pressure-activatable body (4) within the boat is arranged.

4. Use according to claim 3, characterized in that the boat comprises at least one bottom (1) and a peripheral side wall (2) and the pressure-activatable body (4) is attached to the bottom of the boat.

5. Use according to one of claims 1 to 3, characterized in that the bottom of the pressure-activatable body and the bottom of the floating body form an integral unit.

6. Use according to one of the preceding claims, characterized in that the pressure-activatable body has only one cavity and this only has an opening with a reduced diameter (10) in its upper region.

7. Use according to one of claims 1 to 5, characterized in that the pressure-activatable body has a first cavity (9) with an opening arranged in its upper region with a reduced diameter and a second cavity (8) for receiving a solid or liquid substance ) which is separated from the first cavity by a gas and liquid-tight wall that can be opened by relatively slight forces.

8. Use according to claim 7, characterized in that the partition between the two cavities is a peripheral wall which completely surrounds the second cavity laterally.

9. Use according to claim 8, characterized in that the second cavity (8) has the shape of a cylinder or another, with respect to an axis (x) rotationally or rotationally symmetrical shape and the first cavity (9) has the shape of a cylindrical Sleeve or a form derived therefrom.

10. Use according to one of the preceding claims, characterized in that the pressure-activatable body is arranged centrally in the floating body.

11. Use according to claim 10, characterized in that both the pressure-activatable body and the floating body are rotationally symmetrical with respect to an axis (x).

12. Use according to one of the preceding claims, characterized in that the pressure-activatable body additionally has a weight (7).

13. Use according to claim 12, characterized in that the weight is an integral part of the pressure-activatable body.

14. Use according to one of the preceding claims, characterized in that it is composed exclusively of a bottom part (13) and a cover part (12) and, if necessary, a weight (7).

15. Use according to claim 14, characterized in that the bottom part and the cover part are connected to one another via snap connections, frictional connections or weak adhesive connections.

16. Use according to one of claims 14 or 15, characterized in that the two parts (12, 13) are interconnected via their side walls.

17. Use according to claim 14 or 15, characterized in that either the cover part or the bottom part has all the side walls of the insert and these snap when connecting into the bottom or the lid of the other

Intervene partially or grasp structures attached there.

18. Use according to one of the preceding claims, characterized in that the pressure-activatable body and the floating body are made of plastic and / or that the weight is made of a material with a specific

Weight of> 1, for example made of metal or ceramic.

19. Use of an insert according to one of the preceding claims for improving the formation of gas bubbles in a liquid which is sealed under gas pressure in a container when opening this container, characterized in that the insert before or after filling the open container with the liquid in this is entered and the

Liquid container is closed in such a way that an excess pressure arises after the closure within the liquid container compared to the ambient pressure.

20. Use according to claim 19, wherein the gas space above the liquid in the liquid container is pressurized, which causes the above-mentioned pressure to arise within the liquid container after the closure.

21. Use according to claim 18 or claim 19, characterized in that the liquid is a foaming beverage and in particular beer.

22. Use of an insert according to claim 7 or a claim dependent thereon for mixing a substance stored separately in a container with a liquid in the container when opening this container, characterized in that the cavity (8) provided for an insert according to claim 7 or a dependent claim is filled with the solid or liquid substance, the open container is filled with liquid, the insert is inserted into the container before or after filling the liquid and the liquid container is closed such that after the closure of the Liquid container creates an overpressure compared to the ambient pressure.

23. Use according to claim 22, wherein the gas space above the liquid in the liquid container is pressurized, which causes that after

Closing the above-mentioned pressure arises within the liquid container.

24. Use according to claim 22 or 23, characterized in that the liquid beer and the separately stored substance are an aroma carrier.

25. Use according to claim 22 or 23, characterized in that the liquid is a non-alcoholic, carbonated drink or a still drink that has been filled with the addition of liquid nitrogen, and the separately stored substance is a food supplement and / or an aroma carrier.

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