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A capsule, for example for brewing coffee, comprising a rotationally symmetrically formed capsule body having a side wall and having a base formed integrally therewith. The capsule is closed by a lid to form a sealed chamber for accommodating the substance contained in the capsule. The base and lid

A capsule, for example for brewing coffee, comprising a rotationally symmetrically formed capsule body having a side wall and having a base formed integrally therewith. The capsule is closed by a lid to form a sealed chamber for accommodating the substance contained in the capsule. The base and lid can be pierced in order that a liquid can be channelled through the capsule. The base is provided with an annular channel, of which the inner wall portion forms a stiffening zone. The base of the channel here forms a piercing zone which, as a result of the stiffening zone, can be pierced to better effect and without the capsule base as a whole being deformed.

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1. A capsule consisting of a rotationally symmetrically formed capsule body having a side wall, a base formed integrally with the side wall, and a lid which covers the capsule body and is intended for forming a closed chamber that contains a substance for preparing a beverage, the lid and the base b

1. A capsule consisting of a rotationally symmetrically formed capsule body having a side wall, a base formed integrally with the side wall, and a lid which covers the capsule body and is intended for forming a closed chamber that contains a substance for preparing a beverage, the lid and the base being pierceable by means arranged outside the capsule for a liquid to be channeled through the chamber from the lid towards the base, wherein the substance rests directly on the base of the capsule,wherein the base comprises an outer wall portion and an inner wall portion for defining an annular channel, wherein the inner wall portion forms a frustoconical stiffening zone which tapers towards the lid, wherein the base further comprises a pierceable zone defined between the outer wall portion and the inner wall portion, andwherein the pierceable zone has a consistent wall thickness, which is smaller than a wall thickness of the inner wall portion or the outer wall portion. 2. The capsule according to claim 1, wherein a height of the inner wall portion, referring to the longitudinal centre axis of the capsule, is smaller than an average diameter of the inner wall portion. 3. The capsule according to claim 1, wherein the outer wall portion of the annular channel widens frustoconically towards the lid and merges directly into the side wall of the capsule body. 4. The capsule according to claim 1, wherein the outer wall portion of the annular channel widens frustoconically towards the lid and merges into the side wall of the capsule body by way of a shoulder or by way of a radius. 5. The capsule according to claim 4, wherein the inner wall portion of the annular channel extends into the plane of the shoulder or the plane of the beginning of the radius between the outer wall portion and the side wall. 6. The capsule according to claim 1, wherein the wall thickness of the inner wall portion is at least 1.5 times to 2 times greater than the wall thickness of the pierceable zone. 7. The capsule according to claim 1, wherein the wall thickness of the inner wall portion is between 0.20 to 0.36 mm and the wall thickness of the pierceable zone is 0.1 to 0.2 mm. 8. The capsule according to claim 1, wherein the inner wall portion defines a cup-like cavity, which extends towards the interior of the capsule and opens towards the outside. 9. The capsule according to claim 1, wherein the base has a central base section defined by the inner wall portion, which section is parallel to the pierceable zone of the base. 10. The capsule according to claim 9, wherein the central base section has a consistent wall thickness that is greater than the thickness of the inner wall portion or outer wall portion, and wherein the consistent wall thickness of the central base section is between 0.50 to 0.70 mm. 11. The capsule according to claim 9, wherein the outer wall portion merges into the side wall of the capsule body by way of a shoulder or by way of a radius, and wherein the central base section runs in the plane of the shoulder or the plane of the beginning of the radius between the outer wall portion and the side wall. 12. The capsule according to claim 9, wherein the central base section is concavely inwardly curved and the inner wall portion merges into the central base section. 13. The capsule according to claim 9, wherein the central base section is convexly outwardly curved and the inner wall portion merges into the central base section. 14. The capsule according to claim 13, wherein the central base section is configured in a flexible manner such that the central base section is capable of being pushed concavely inwards by a force exerted from the outside. 15. The capsule according to claim 1, wherein the capsule body consists of polypropylene. 16. A capsule body for the capsule according to claim 1, wherein the side wall has a stack edge intended for being supported by a further capsule body, which stack edge is arranged such that in the case of stacked capsule bodies inner wall portions of the channels are arranged at a distance from one another. 17. Means for penetrating the base of the capsule according to claim 1, having a base plate with an annular piercing zone on which a plurality of piercing elements are arranged, a frustoconical elevation being arranged in the centre of the piercing zone. 18. The means according to claim 17, wherein the piercing zone forms an annular trough. 19. The means according to claim 18, wherein the piercing elements are designed as multi-surface hollow bodies, at least one of the surfaces being a surface inclined against the piercing direction, on which openings are arranged in a perforated strainer structure. 20. The means according to claim 17, wherein the piercing elements form bodies which taper to a tip or to a cutting edge and have an outflow channel which extends through the base plate and opens out towards at least one side surface of the body. 21. The means according to claim 20, wherein openings in the side surfaces of the bodies are covered by a straining film. 22. The means according to claim 17, wherein the piercing elements are approximately of the same height as the frustoconical elevation in the centre. 23. The means according to claim 17, wherein a helical compression spring is arranged on the frustoconical elevation, a free end of which is adapted to be positioned on the base of a capsule which is pressed against the base plate. 24. A device for preparing a beverage, comprising: a capsule consisting of a rotationally symmetrically formed capsule body having a side wall, a base formed integrally with the side wall, and a lid which covers the capsule body and is intended for forming a closed chamber that contains a substance for preparing the beverage, the lid and the base being pierceable by means arranged outside the capsule in order for a liquid to be channeled through the chamber from the lid towards the base, wherein the substance rests directly on the base of the capsule, wherein the base comprises an outer wall portion and an inner wall portion for defining an annular channel, wherein the inner wall portion forms a frustoconical stiffening zone which tapers towards the lid, wherein the base further comprises a pierceable zone defined between the outer wall portion and the inner wall portion, and wherein the pierceable zone has consistent wall thickness that is smaller than a wall thickness of the inner wall portion or the outer wall portion,two chamber parts which are adapted to be pressed against one another to form a closed chamber, one chamber part being designed as a capsule holder with a cavity for accommodating the capsule and the other chamber part being designed as a closure part for closing the cavity, and the base of the cavity and the closure part being provided with a means comprising a base plate with an annular piercing zone on which a plurality of piercing elements are arranged, a frustoconical elevation being arranged in the centre of the piercing zone, such that, when the cavity is closed, the base and the lid of the capsule arranged in the cavity are penetrated in order for the liquid to be channeled through.