System for preparing beverages

1 . A system for producing beverages starting from a capsule through an injection of water under pressure comprising:

a dispensing machine comprising an injection device for supplying water under pressure to the capsule, a housing element configured to house the capsule and a dispensing device for closing the housing element in a closed configuration of the dispensing machine, wherein the housing element comprises an annular sealing edge, which extends about an axis and is configured to contact the capsule in the closed configuration; wherein

the capsule comprises a casing, which comprises a base wall and a side wall defining a cavity containing an initial product to be added to water for obtaining the beverage, and a flanged edge extending from said side wall; a covering element, fixed to the flanged edge for closing the cavity; a sealing element, connected to the flanged edge for creating a fluidic seal with the sealing edge in the closed configuration; and wherein

the sealing edge includes a plurality of radial open grooves and radial crests which in the closed configuration prior to dispensing penetrate, or contact, a sealing area of the annular body, said grooves and said radial crests penetrating even more deeply into the sealing area during dispensing, so as to improve the fluidic seal, when the annular body is softened in contact with the water injected by the injection device;

wherein the sealing element is made as a cellulose-based annular body;

wherein the annular body has a grammage of between 300 gr/m 2 and 800 gr/m 2 .

2 . The system according to claim 1 , wherein in the closed configuration prior to dispensing, the radial crests penetrate into the sealing area by at least 0.10 mm.

3 . The system according to claim 1 , wherein the housing element comprises a free edge which is annular, externally surrounds the sealing edge and projects less along the axis with respect to the sealing edge, between the sealing edge and the free edge, an annular recess being present having a bottom which, in the closed configuration prior to dispensing, is at a first distance from the flanged edge, which is greater than a second distance, measured at the end of dispensing; the difference between the first distance and the second distance being comprised between 0.010 mm and 0.200 mm.

4 . The system according to claim 3 , wherein when the radial grooves and the radial crests of the sealing edge penetrate, or contact, the sealing area, prior to dispensing, the sealing area is compressed and acts in turn in a free area which is annular, external with respect to the sealing area and surrounds the sealing area, the free area being forced to deform and swell for the movement of the material with which the annular body is made from the sealing area to the free area.

5 . The system according to claim 4 , wherein the free edge comprises at least a first annular part at a constant height along the axis and at least a second annular part comprising a plurality of radial interruptions, and wherein the first annular part is distant from the free area in the closed configuration, prior to dispensing, and is in contact with the free area during dispensing, the plurality of radial interruptions remaining distant from the free area during dispensing.

6 . The system according to claim 1 , wherein the annular body comprises a single layer of cellulose-based material configured for contacting the dispensing machine.

7 . The system according to claim 1 , wherein the annular body comprises a stratified structure which comprises at least one cellulose-based outer layer, and a joining layer configured to enable the stratified structure to be joined to the flanged edge.

8 . The system according to claim 7 , wherein the stratified structure is made through a plurality of layers comprising at least two cellulose-based layers, including the outer layer and an inner layer, wherein the stratified structure additionally comprises a further joining layer for joining the outer layer and the inner layer to each other, the inner layer being joined to the flanged edge by the joining layer.

9 . The system according to claim 8 , wherein each layer of the annular body is selected appropriately regarding the grammage and/or thickness and/or composition and/or hydrophilicity so that the outer layer is different from the inner layer.

10 . The system according to claim 1 , wherein the annular body has a thickness of between 0.55 mm and 1.10 mm, to ensure the improvement of the fluidic seal.

11 . The system according to claim 1 , wherein the annular body has a grammage of between 500 gr/m 2 and 800 gr/m 2 .

12 . The system according to claim 1 , wherein the annular body has a grammage of between 600 gr/m 2 and 800 gr/m 2 .

13 . The system according to claim 1 , wherein the annular body has a grammage equal to 700 gr/m 2 .

14 . The system according to claim 1 , wherein the annular body has a thickness of between 0.70 mm and 1.00 mm, to ensure the improvement of the fluidic seal.

15 . The system according to claim 1 , wherein the annular body has a thickness equal to 0.90 mm, to ensure the improvement of the fluidic seal.

16 . The system according to claim 1 , wherein the sealing element is made of paper or cardboard.