Capsule, a system for preparing a potable beverage from such a capsule and use of such a capsule in a beverage preparation device

System according to claim 51, wherein the outwardly extending flange has no more than one single annular projection comprising a projection top projecting axially towards the bottom from an inner projection foot radially outside of an inner flange portion and an outer projection foot radially inside of an outer flange portion.

System according to claim 51, wherein the at least one projection is configured such that its projection top exerts an outward radial force on the free contact end of the annular element if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of the closing member of the beverage preparation device.

System according to claim 51, wherein the bottom of the trough is axially spaced from the cover.

(canceled)

System according to claim 51, wherein the sealing member is deformable such that, in use, closure of the enclosing member causes the axial spacing between the outer projection foot and the bottom of the trough to be reduced.

(canceled)

System according to claim 51, wherein the projection has a generally inwardly facing surface portion extending at an enclosed angle of less than 8° and preferably less than 6° or less than 4° to the capsule body axis.

(canceled)

System according to claim 51, wherein the capsule comprises a bearing for the enclosing member if the capsule is positioned in the enclosing member and the enclosing member is closed by means of the closing member, said bearing being formed by at least the projection.

System according to claim 51, wherein the projection is shaped to roll and buckle radially outwards if compressed in axial direction, while in contact with an outwardly facing surface of a free end of the annular element.

19-21. (canceled)

System according to claim 51, wherein the thickness of the aluminum capsule body is such that it is deformed easily if the capsule is positioned in the enclosing member of the beverage preparation device and the enclosing member is closed by means of the closing member of the beverage preparation device, preferably the thickness of the aluminum capsule body is 20 to 200 micrometer, preferably 100 micrometer.

23 and 24. (canceled)

System according to claim 51, wherein the aluminum cover is arranged to tear open on the closing member of the beverage preparation device, such as an extraction plate of the beverage preparation device under the influence of fluid pressure in the capsule.

System according to claim 51, wherein the side wall of the aluminum capsule body has a free end opposite the bottom, the outwardly extending flange extending from said free end of the side wall in a direction at least substantially transverse to the central capsule body axis.

System according to claim 51, wherein the outwardly extending flange comprises a curled outer edge.

(canceled)

30-36. (canceled)

System according to claim 51, wherein the height of the sealing member portion to be contacted first by the free end of the enclosure member when the enclosure member is closed is at least about 0.1 mm, more preferably at least 0.2 mm and most preferably at least 0.8 mm and at most 3 mm, more preferably at most 2 mm and most preferably at most 1.2 mm.

38-44. (canceled)

System according to claim 51, wherein the sealing structure is deformable such that said projection fluid sealingly contacts at least a portion of the free contact end of the annular element if, in use, the maximum fluid pressure in the enclosing member of the beverage preparation device is in the range of 6-20 bar, preferably between 12 and 18 bar.

System according to claim 51, wherein the sealing structure is deformable such that said projection fluid sealingly contacts at least a portion of the free contact end of the annular element if, during brewing, said free contact end of the annular element exerts a force F2 on the sealing structure of the capsule, wherein F2 is in the range of 500-1500 N preferably in the range of 750-1250 N when the fluid pressure P2 in said enclosing member outside the capsule is in the range of 6-20 bar, preferably between 12 and 18 bar.

System according to claim 51, wherein the sealing structure is deformable such that said projection fluid sealingly contacts at least a portion of the free contact end of the annular element if, in use, prior to or at the start of brewing, said free contact end of the annular element exerts a force F1 on the sealing structure of the capsule, wherein the force F1 is in the range of 30-150 N, preferably 40-150 N and more preferably 50-100 N, when the fluid pressure P1 in the enclosing member of the beverage preparation device outside the capsule is in the range of 0.1-4 bar, preferably 0.1-1 bar.

System according to claim 51, wherein the sealing structure is deformable such that said projection fluid sealingly contacts at least a portion of the free contact end of the annular element if the free contact end of the annular element that is pressed against the sealing structure has a plurality of radially extending open grooves uniformly spaced relative to each other in circumferential sense of said free contact end of the annular element.

(canceled)

System according to claim 51, wherein the sealing structure and the remainder of the capsule body are made of the same plate material.

56-59. (canceled)

63-71. (canceled)