EP2102078A2

EP2102078A2 - Capsule, means for piercing the base of a capsule and device for preparing a beverage

Info

Publication number: EP2102078A2
Application number: EP08701417A
Authority: EP
Inventors: Kees Aardenburg
Original assignee: Swiss Caffe Asia Ltd
Current assignee: Swiss Caffe Asia Ltd
Priority date: 2007-01-15
Filing date: 2008-01-11
Publication date: 2009-09-23
Also published as: ES2661027T3; US9248955B2; EP1944248B1; CN101636333A; RU2009131052A; JP5205392B2; CN101636333B; BRPI0806569B1; CA2674483A1; WO2008087099A2; KR20090107058A; CA2674483C; PT1944248T; PL1944248T3; US20100064899A1; RU2433077C2; JP2010515556A; ATE474798T1; DE502007004474D1; EP1944248A1

Abstract

The capsule (1) has a rotation symmetrically designed capsule body with a side wall (3) and a base. A cover which covers the capsule body forms a closed chamber, which contains a substance for preparation of beverages. The substance lies directly on the base of the capsule. The base exhibits an annulus ring shaped groove, whose inner wall area (9) forms a frustum cone shaped reinforcement zone, which tapers against the cover. A base (11) of the groove forms a pentratable zone. An independent claim is also included for a device for preparing a beverage using the capsule.

Description

Capsule, means for penetrating the bottom of a capsule and device for the preparation of a drink

The invention relates to a capsule according to the preamble of claim 1. Such capsules are now widely used as sachets for the preparation of e.g. Coffee used. The consumer no longer has to worry about dosing the right amount of coffee and after the extraction process, the capsule and its contents are disposed of.

The coffee powder also remains packed in the closed chamber aroma-tight and is protected from moisture.

Comparable capsules have become known, for example, from EP 1 101 430 or EP 1 344 722. A problem with such capsules is penetration with means outside the capsule. These funds are usually associated with a machine for the preparation of a drink, the capsule only has to be inserted into the machine, the force required for the penetration of the capsule is done manually via a lever mechanism or the like. The capsule must be sufficiently robust to protect the contents from damage and to avoid deformation due to external forces. It has also been shown that it is much more advantageous to perforate the capsule at several places at the same time in order to achieve optimal wetting of the coffee powder and passage of the brewing water. These factors cause a relatively large amount of force for the penetration or a high tensile stress in the material until it comes to the actual penetration. Associated with this are material strains on the capsule wall, which can impair clean penetration. By GB 1 256 247 a capsule for the preparation of a beverage has become known, in which a penetration agent for penetrating the bottom of the capsule in the capsule itself is arranged. The penetrant consists of a central mandrel in the center of the capsule, which is activated by external pressure on the capsule lid. At the same time, the lid is pierced by a lance, which introduces the liquid into the capsule. The substance lying on the bottom of the capsule is always flowed through by the liquid towards the center, which has an unfavorable effect on the solubility or on the extractability of the substance in the bottom area.

US Pat. No. 2,899,886 discloses a device for the preparation of a beverage, with the aid of which a liquid can flow through a capsule in a closed brewing chamber. When closing the brewing chamber, the capsule is penetrated at the bottom and on the lid by a plurality of concentrically arranged lances. However, this device is not suitable for extraction under high pressure and at high flow rates.

It is therefore an object of the invention to provide a capsule of the type mentioned, which is penetrated as possible in a specially designated zone by a variety of penetration means, without causing undesirable deformations at the bottom of the capsule. In addition, an optimal flow of the flow through the substance should be achieved.

This object is achieved by a capsule, which has the features in claim 1. The substance for the preparation of the drink is directly on the bottom of the capsule, so it is not delimited by additional filter layers, which can further complicate a penetration. The bottom of the capsule has an annular groove, the inner wall portion forms a preferably tapered against the lid, preferably frustoconical stiffening zone. This stiffening zone prevents the capsule bottom from unduly flexing during the development of the tear tension immediately before the penetration. The required rice tension thus builds up abruptly, whereby a clean penetration of the capsule bottom is achieved at the penetrable zone at the bottom of the channel. A frustoconical stiffening zone has proven to be advantageous for manufacturing and strength reasons.

Of course, depending on the design of the inner wall section, this stiffening zone could also have a different configuration. The height of the inner wall portion relative to the longitudinal center axis of the capsule may be smaller than the average diameter of the inner wall portion, whereby a sufficient ratio between height and diameter of the wall portion is achieved.

Another advantage of the annular groove with the penetrable bottom area is that when passing the brewing water from the lid against the ground at a corresponding injection pressure, the liquid accumulates first in the gutter. Immediately before the discharge of the extract through the perforated sites takes place a kind of pre-extraction in the gutter. The outer wall portion of the gutter may also extend against the lid preferably frusto-conical and pass directly into the side wall of the capsule. But it is also conceivable that the outer wall portion of the groove against the lid preferably widens frustoconical and that it merges with a paragraph or with a radius in the side wall. With this heel or radius is also on the outside of the circular annular penetration zone causes a material stiffening, which favors the penetration. It may be expedient if the inner wall portion of the channel extends into the plane of the shoulder or the radius approach between the outer wall portion and the side wall.

The ratio between penetration zone and stiffening zone can be designed particularly optimally if the wall thickness of the floor is less in the region of the penetratable zone than on the inner and / or on the outer wall section of the annular groove.

The wall thickness can be at least 1.5 times to 2 times as large at the inner wall part as at the bottom of the gutter. It has proven to be particularly advantageous if the wall thickness at the inner wall portion between 0.20 to 0.36 mm, preferably 0.28 mm and at the bottom of the trough between 0.1 to 0.2 mm, preferably 0.15 mm. These values relate, for example, to a capsule body made of polypropylene. Also, the side wall of the capsule body or the central bottom portion may be formed with respect to the wall thickness same as the inner wall part. In this way, a very stiff floor construction can be effected.

The inner wall portion may advantageously define a pot-like cavity extending against the interior of the capsule and open towards the outside. In the extraction chamber, this cavity serves to engage a complementary projection and stabilize and center the capsule bottom. In certain cases, however, it would also be conceivable that the inner wall section does not delimit a hollow space but rather a solid body, so that the bottom of the capsule runs completely flat. Further advantages can be achieved if the inner wall section merges at its lid-side end into a central bottom section which preferably runs parallel to the bottom of the channel. The central bottom portion may extend in the plane of the paragraph or the radius approach between the outer wall portion and the side wall.

It has proved to be particularly advantageous if the wall thickness of the central floor section is greater than at the bottom of the channel and preferably also larger than on the inner and / or on the outer wall section. A wall thickness of 0.50 to 0.70 mm, preferably 0.60 mm has proven particularly useful. This configuration results in a very stiff central floor area which is not subject to concentric deflections.

The inner wall portion can pass at its lid-side end but also in a concave inwardly curved central floor section. For a dome-like effect is achieved, which stiffen the inner wall portion of the channel particularly advantageous. But the inner wall section can just as well pass over at its lid-side end into a convexly outwardly curved central floor section. This achieves the same effect as with the concave curvature. The central bottom portion may also be designed so flexible that it can be concerted by a force from the outside concave inwards. As a result, for example, a reduction of the capsule volume and thus a compression of the substance contained therein could be achieved. Even a slight overpressure Hesse could achieve with such a soil deformation, which could further favor the perforation. The capsule bodies for the capsules described above are advantageously provided with a side wall which has a stacking edge intended for support on a further capsule body, which is arranged such that in the case of stacked capsule bodies, the inner wall parts of the grooves are arranged at a distance from each other. This measure prevents the frusto-conically inclined inner wall sections from becoming wedged together during stacking, which would obviously make it more difficult to singulate the stack in a production line.

The invention also relates to a means for penetrating the bottom of a capsule described above, comprising a bottom plate having an annular penetration zone on which a plurality of penetration elements are arranged, wherein in the center of the penetration zone a preferably frusto-conical elevation is arranged. Evidently, this central elevation penetrates into the central bottom recess on the capsule and thereby causes centering of the capsule during penetration.

The penetration zone also preferably forms an annular trough, which corresponds to the annular groove of the capsule.

The penetration elements may form into a tip or blade tapered body having a drainage channel extending through the base plate and opening against at least one side surface of the body. Evidently, such penetration elements serve not only the actual penetration of the capsule, but also directly the discharge of the liquid. The openings in the side surfaces of the body can be covered with a screen. The filter or sieve effect during the discharge of the liquid is thereby achieved directly on the penetration elements. The screen film can be provided with such fine openings that even the finest solid particles are retained. Instead of the screen foil but it would also be possible to provide the penetration elements with a plurality of very fine holes, which lead from the outside into the drainage channel.

The openings of the drainage channel can each be arranged in a side surface of the body, which faces the central elevation. Thus, a flow is forced during the extraction process in the capsule, which runs from the center to the outside against the penetration elements.

As an alternative to the configuration described above, the penetration elements can also be designed as multi-surface, hollow bodies, wherein at least one of the surfaces is a surface inclined against the penetration direction, on which openings are arranged in a perforated screen structure. Such penetrants can be prepared in a simple manner and they also fulfill an optimal filtration effect.

The penetration elements can be about the same height as the preferably frusto-conical elevation in the center. On the preferably frusto-conical increase may also be arranged a helical compression spring, the free end of which can be applied to the bottom of a pressed against the bottom plate capsule. This helical compression spring causes a directed away from the bottom plate force which facilitates the detachment of the capsule from the bottom plate or from the penetration elements. Evidently, the central increase in the capsule bottom, inter alia, also serves to center this helical compression spring. Finally, the invention also relates to a device for the preparation of a beverage with the features in claim 25. This device allows simultaneous penetration of the capsule on the lid and on the floor, wherein the opening and closing of the two chamber parts can be done in different ways. Also, the relative position of the capsule at the time of penetration basically does not matter.

Further advantages and individual features of the invention will become apparent from the embodiments described below and from the drawings. Show it:

FIG. 1 shows a cross section through a first embodiment of a capsule according to the invention,

FIG. 2 shows a perspective view of the capsule according to FIG. 1 with a view of the floor,

FIG. 3 shows a perspective view of the capsule according to FIG. 1 with a view of the capsule inside,

FIG. 4 shows a cutaway perspective view of the underside of the capsule according to FIG. 1 during the penetration on a penetration means,

FIG. 5: an overall perspective view of the penetration means according to FIG. 4,

6 shows a perspective view with a view into the interior of the capsule according to FIG. 4, FIG.

FIG. 7: a perspective view with a view of the bottom of the penetration means according to FIG. 4, FIG. 8 shows a brewing device for a capsule according to FIG. 1 before closing the cavity,

FIG. 9 shows the device according to FIG. 8 with the cavity closed;

FIG. 10 shows a cross section through a second embodiment of a capsule according to the invention,

FIG. 11 shows a perspective view of the capsule according to FIG. 10 with a view of the ground,

FIG. 12 shows a perspective view of the capsule according to FIG. 10 with a view into the interior of the capsule,

FIG. 13 shows a cross section through a brewing device for brewing the capsule according to FIG. 10 with the cavity open;

FIG. 14 shows the device according to FIG. 13 with the cavity closed;

FIG. 15 shows a cross section through a capsule bottom with a frustoconical stiffening zone,

FIG. 16 shows a cross section through a capsule bottom with a cylindrical and conical stiffening zone,

FIG. 17 shows a cross section through a capsule bottom with dome-shaped stiffening zone,

FIG. 18 shows a cross section through a capsule with a stacking edge, FIG. 19 shows a cross section through two stacked capsule bodies with a stacking edge,

FIG. 20 shows a cross section through a capsule bottom of an alternative embodiment, and

FIG. 21 is a perspective view of an alternative penetrant.

As can be seen from FIGS. 1 to 3, a capsule designated overall by 1 consists of a preferably rotationally symmetrical capsule body 2, consisting of a side wall 3 which merges seamlessly into a bottom 4. The capsule body 2 may be made, for example, by a deep-drawing method or an injection-molding method, and is preferably made of a plastic material such as e.g. Polypropylene. Other materials or laminates are readily conceivable.

The cup-shaped capsule body 2 is closed at its upper end with a cover 5, which preferably also consists of plastic material and which is welded or glued in the peripheral region of the capsule body. The capsule forms in this way a closed, hermetically sealed chamber 6, which is filled with a substance 7 for the preparation of a beverage. The filling does not necessarily have to correspond to the maximum possible volume of the chamber 6. To protect the filling, the chamber 6 may also be filled with an inert gas. The substance 7 may be, for example, coffee powder or tea, an extraction process taking place when the capsule flows through with hot water. In the case of the substance 7, however, it could also be, for example, a dry extract which completely passes into solution when flowing through with hot or cold water, so that no residues are present in the last the capsule remain. It would be conceivable, for example, a dry extract for the production of a fruit drink or a bouillon.

The substance 7 is without filter layers or the like directly on the bottom 4 of the capsule body 2. A prerequisite for this is the special type of penetration of the capsule base described below, or the design of the capsule base itself. This has an annular groove 8, the inner wall portion 9 of which tapers towards the cover, preferably in the shape of a truncated cone. The outer wall portion 12 of the channel 8 preferably widens with the same angle inclination relative to the longitudinal center axis 10 as the inner wall portion 9. The height hr of the channel 8 in the direction of the longitudinal central axis 10 is advantageously smaller than the average diameter dm of the inner wall portion 9 and preferably also smaller than the average width of the gutter. The inner wall portion 9 forms a stiffening zone, which opposes the penetration of the bottom 11 of the channel resistance. The same function can also be exerted on the outer wall part 12, it being expedient for the wall thickness of the inner wall part 9 and the outer wall part 12 to be somewhat reinforced, in particular with respect to the bottom 11 of the channel.

The lid-side upper end of the inner wall portion 9 merges into a central bottom portion 14, which runs parallel to the bottom 11 of the channel. At the same level of the central bottom portion 14, the outer wall portion 12 merges with a radius 13 in the side wall 3. The transition could also be made with a paragraph that runs at right angles or obliquely to the longitudinal central axis 10.

In the figures 4 and 5, a means 16 is shown, which is suitable for the penetration of the bottom 4 of the capsule 1. This Means has a bottom plate 17 with a central, preferably frusto-conical elevation 20 and with a circumferential outer wall 37. In this way, an annular trough or penetration zone 18, in which preferably a plurality of penetration elements 19 are arranged in a circular manner. These have the form of obliquely cut cylinders or cones with a directed against the lid of the capsule tip or cutting edge 21. Through each penetration element extends a drain channel 22 which also extends through the bottom plate 17. Each drainage channel opens against a side surface 23 of a penetration element which lies below or within a point or cutting edge 21. As shown in the exemplary embodiment, all side surfaces 23 face the center or the elevation 20.

To achieve a filtering effect, the openings 24 in the side surfaces 23 are covered with a screen foil 25 (FIG. 5). Such films are also referred to as Mikrosiebfolien, the fineness of the openings can be chosen arbitrarily depending on the desired filtering effect. The film sections can be secured by welding on the side surfaces 23.

As can be seen from FIG. 4, a helical compression spring 26 can still be fastened to the central elevation 20, which is compressed to block during the penetration process and which facilitates the subsequent detachment of the capsule. In addition, a continuous opening 27 can be arranged in the center of the elevation 20, which prevents an air cushion from being able to build up above the elevation 20.

Figure 6 shows the same situation when penetrating the capsule bottom as Figure 4, ie immediately after the tips of the penetration elements 19, the bottom 11 of the channel in the capsule have pierced, but not yet the entire cross-section of the openings 24 is exposed. As can be seen in particular from FIG. 4, the bottom 11 of the channel can be slightly lifted during the penetration process in relation to the unloaded layer (FIG. 1). However, the bottom 11 remains plane-parallel due to the stiffening by the inner wall portion 9, whereby the penetration of a high resistance is opposed. The required for the penetration rice tension is achieved immediately and the bottom 11 suffers no inadmissible deflection.

As soon as the build-up of pressure in the capsule begins, the bottom of the capsule is pressed in a form-fitting and pressure-tight manner against the bottom plate 17 and thus the maximum outflow cross-section at the openings 24 is reached. The extract then flows through the drainage channels 22 (Figure 7) where it can be suitably collected and directed away.

FIGS. 8 and 9 show a cross section through a brewing module of a coffee machine for a capsule according to FIG. 1 and using a penetrating agent 16 according to FIG. 5. The essential elements of this device 28 consist of a capsule holder 29, in the bottom of which the described penetration means 16 is installed , The capsule holder can be closed or sealed with a closure part 30 to a brewing chamber. The closure member is in turn provided with a plurality of penetration elements 31 which may be similarly configured and arranged as those on the penetration means 16. The closure member 30 is mounted on a support 36 which in a frame 34 by means of a lever mechanism 35 linearly against the capsule holder 29 or can be moved away from this. When the brewing chamber according to FIG. 9 is completely closed, the capsule 1 has penetrated at its lid and at its bottom. Brewing water is introduced via an inlet 32 via a pump (not shown here) or passed through the capsule from the lid to the bottom. The extract, so for example, the finished coffee flows through a drain 33.

In the embodiment according to FIGS. 10 to 12, the capsule 1 differs from that according to FIG. 1 in that the inner wall section 9 of the annular channel 8 merges at its cover-side end into a convexly curved central bottom section. In addition, the outer wall portion 12 of the channel 8 merges seamlessly and without changing the diameter directly into the side wall 3. The central wall portion 15 is formed such that it can be slipped by a force from the outside against the lid 5, which evidently reduces the volume of the chamber 6 slightly.

This process is shown in the device 28 according to FIGS. 13 and 14. When closing the brewing chamber by the merging of the capsule holder 29 and the closure member 30 of the central bottom portion 15 is still convex outwardly arched. However, the helical compression spring 26 is already applied to this bottom portion and exerts an increasing force on him. Incidentally, the elevation 20 in the penetration means 16 is not frustoconical in this case, but is formed like a dome.

Even before reaching the closed position according to FIG. 14, the central bottom section 15 is turned upwards concavely inwards against the lid of the capsule, whereby a slight compression of the capsule contents is effected. Thus, a compaction of the coffee powder and thus an improved extraction can be achieved. Figure 15 shows again a cross section through a capsule bottom, wherein the stiffening zone is the same as in Figure 4 frusto-conical. The inner wall portion 9 of the annular groove 8 thus tapers at a certain angle towards the lid. The case remaining central bottom portion 14 extends plane-parallel to the bottom 11 of the channel. Clearly visible here is the difference between the wall thickness a at the bottom 11 of the channel and the wall thickness b at the inner wall part 9 or at the outer wall part 12. This ensures the lowest possible penetration on the ground.

In the embodiment according to FIG. 16, the stiffening zone forms a cylindrical body, which tapers conically towards the cover. The inner wall part of the channel 8 is thus obviously composed of a cylindrical portion 9a and a conical portion 9b.

In the embodiment according to Figure 17, the stiffening zone is dome-shaped, which in the present case is a spherical cap. Evidently, the inner wall section 9 forms a spherical section.

Figure 18 again shows a capsule in which the outer wall portion 12 of the channel 8 as in the embodiment according to FIG 10 directly merges into the side wall 3. The central bottom portion 14 is the same design as in the embodiment according to Figure 1, ie plane-parallel to the bottom 11 of Rinne. In addition, the capsule body 2 is provided in the region of the lid 5 with a peripheral stacking edge 38. This is designed as a transition from a cylindrical to a frustoconical wall section. In the present embodiment, the entire capsule body with the exception of the bottom 11 of the gutter a uniform wall thickness of, for example, about 0.3 mm. In contrast, the wall thickness at the annular bottom 11 of the channel 8 is only 0.15 mm.

FIG. 19 shows two capsule bodies 2a and 2b in the stacked state. As shown, the stacking edge 38 of the capsule body 2a rests on the peripheral flange 39 of the lower capsule body 2b. The side walls 3a and 3b of the capsule body are not completely together or they have a slight play each other. In addition, the distance of the stacking edge to the flange 39 is dimensioned so that the inner wall parts 9a and 9b are also arranged at a distance from each other. This measure prevents the capsule bodies from becoming wedged into one another. In a production line, the capsule bodies are introduced as stacks and automatically singulated for filling.

FIG. 20 shows an alternative exemplary embodiment of a capsule which is configured similarly in the bottom region, as in the exemplary embodiment according to FIG. 18. However, the central bottom section 14 has a wall thickness c which is visibly stronger than the wall thickness b of the inner wall section 9 and the outer wall section. The wall thickness b in this embodiment is about 0.28 mm, while the wall thickness a 0.15 mm and the wall thickness c 0, 6 mm. The height hr of the channel 8 is about 4.5 mm. The inclination angle α of the side wall 3 to the central center axis is about 1.5 °. With such a tilt angle, the individual capsule body can still stack without mutual wedging, and they are also relatively easy to remove from the mold.

FIG. 21 shows an alternative embodiment of a penetration means. In contrast to the execution example According to FIG. 5, this penetration means consists only of a flat disk 17 on which a plurality of tent-like or pyramid-shaped penetration elements 19 are arranged in the shape of a ring. These consist of hole side walls 40 which are inclined towards the penetration direction, wherein in each case a side wall can be punched out of the material of the disc 17 and erect. The two remaining hole side walls are then placed and welded to the disc or with the erected hole side wall. In order to achieve an even easier penetration of the capsule bottom, additional knife edges 41 can be inserted. The hole side walls 40 may have very fine openings, similar to the screen film described above. The thus formed penetration body penetrate easily into the gutter of the capsule and cause a rapid outflow of the liquid with a very good screening effect.

The central opening 42 in the disc 17 serves on the one hand the attachment of the disc in the capsule receptacle and on the other hand, the attachment of the frusto-conical elevation, which is not shown here.

Of course, alternative embodiments for forming the central stiffening zone are conceivable. In particular, the inner wall part could have different angles of inclination, curvatures or wall thicknesses. In the case of capsule bodies which are produced in an injection molding process, it would also be conceivable to use the stiffening zone in the center of the annular groove by additional wall sections, such as e.g. auszusteifen by star-shaped fins. The means for penetrating the bottom of the capsule is adapted in each case in the center of the annular penetration zone of the configuration of the stiffening zone in order to ensure optimum centering.

Claims

claims

1. capsule (1), consisting of a preferably rotationally symmetrical capsule body (2) having a side wall

(3) and having a base (4) integrally formed therewith, and a lid (5) covering the capsule body to form a closed chamber (6) containing a substance (7) for the preparation of a beverage, the lid and the bottom for passage of a liquid through the chamber from the lid to the bottom is penetratable with means (16, 31) outside the capsule, characterized in that the substance (7) is directly on the bottom (4) of the capsule rests that the bottom has an annular groove (8), the inner wall portion (9) preferably forms a against the lid, preferably frustoconical stiffening zone forms, the bottom (11) of the channel forms the penetrable zone.

2. Capsule according to claim 1, characterized in that the height of the inner wall portion, based on the longitudinal central axis

(10) the capsule is smaller than the mean diameter (dm) of the inner wall part.

3. Capsule according to claim 1 or 2, characterized in that the outer wall portion (12) of the channel (8) widens against the cover preferably frusto-conical and merges directly into the side wall (3).

4. Capsule according to claim 1 or 2, characterized in that the outer wall portion (12) of the channel (8) against the lid preferably widens frustoconically and with a Paragraph or with a radius in the side wall (3),

5. Capsule according to claim 4, characterized in that the inner wall portion (9) of the channel (8) extends into the plane of the shoulder or the radius approach between the outer wall portion (12) and the side wall (3).

6. Capsule according to one of claims 1 to 5, characterized in that the wall thickness of the bottom (4) in the region of the penetrable zone (11) is lower than on the inner and / or on the outer wall portion (9, 12).

7. Capsule according to claim 6, characterized in that the wall thickness at the inner wall portion (9) is at least 1.5 times to 2 times as large as at the bottom (11) of the channel (8).

8. Capsule according to claim 6 or 7, characterized in that the wall thickness at the inner wall part (9) between 0.20 to 0.36 mm, preferably 0.28 mm and at the bottom of the channel between 0.1 to 0.2 mm, preferably 0.15 mm.

9. Capsule according to one of claims 1 to 8, characterized in that the inner wall part (9) defines a pot-like, extending against the interior of the capsule and open towards the outside cavity.

10. Capsule according to one of claims 1 to 9, characterized in that the inner wall section (9) merges at its lid-side end in a central bottom portion (14), which preferably runs parallel to the bottom (11) of the channel,

11. Capsule according to claim 10, characterized in that the wall thickness of the central bottom portion (14) is greater as at the bottom of the channel and preferably also larger than on the inner and / or on the outer wall portion and preferably 0.50 to 0.70 mm.

12. Capsule according to claim 4 and claim 10 or 11, characterized in that the central bottom portion (14) extends in the plane of the shoulder or the radius approach between the outer wall portion (12) and the side wall (3).

13. Capsule according to one of claims 1 to 9, characterized in that the inner wall part (9) at its end ends vereleitige in a concave inwardly curved central bottom portion.

14. Capsule according to one of claims 1 to 9, characterized in that the inner wall portion (9) at its end ends vereleitige in a convex outwardly arched central bottom portion (15).

15. A capsule according to claim 14, characterized in that the central bottom portion (15) is so flexibly equipped that it can be concerted by a force from the outside inwardly concave.

16. Capsule according to one of claims 1 to 15, characterized in that the capsule body (2) consists of a plastic material, insbesonsdere of polypropylene.

17. capsule body for a capsule according to one of claims 1 to 16, characterized in that the side wall (3) has a specific for supporting on a further capsule stacking edge, which is arranged such that in stacked capsule bodies, the inner wall parts (9) of Troughs (8) are arranged at a distance from each other.

18. means (16) for penetrating the bottom (4) of a capsule (1) according to one of claims 1 to 16, with a bottom plate

(17), which has an annular penetration zone (18) on which a plurality of penetration elements (19) are arranged, wherein in the center of the penetration zone a preferably frusto-conical elevation (20) is arranged.

19. A composition according to claim 18, characterized in that the penetration zone (18) forms an annular trough.

20. Composition according to claim 18 or 19, characterized in that the penetration elements (19) form a tip or a cutting edge (21) tapered body with a drain channel (22) extending through the bottom plate (17) and extends opens against at least one side surface (23) of the body.

21. A composition according to claim 20, characterized in that the openings (24) in the side surfaces of the body with a screen foil (25) are covered.

22. Composition according to claim 18 or 19, characterized in that the penetration elements are formed as multi-surface, hollow body, wherein at least one of the surfaces is an inclined surface against the penetration direction, are arranged on the openings in perforated wire structure.

23. Composition according to one of claims 18 to 22, characterized in that the penetration elements (19) are approximately the same height as the preferably frusto-conical elevation downtown .

24. Composition according to one of claims 18 to 23, characterized in that on the truncated cone-shaped increase a helical compression spring (26) is arranged, the free end of which can be applied to the bottom of a capsule pressed against the bottom plate capsule.

25. A device for the preparation of a beverage using a capsule (1) according to one of claims 1 to 16, with two mutually compressible to form a closed chamber chamber parts, wherein a chamber part as a capsule holder (29) having a cavity for receiving a capsule and the other chamber part is designed as a closure part (30) for closing the cavity and wherein the bottom of the cavity has a means (16) according to one of claims 17 to 24 and the closure part is also provided with penetration means (31) such that when closed Cavity therein a capsule at the bottom and the lid for passing a liquid is penetrated.