Capsule for beverages

Abstract

A capsule includes: an aluminum casing extending about an axis, which includes base and side walls defining a cavity containing a product, and a flanged edge extending from the side wall and including an end annular bead; a covering element, fixed to the flanged edge to close the cavity; a cellulose-based ring sealing element, to seal with a dispensing machine. The flanged edge includes a first portion including the annular bead, an annular second portion contiguous with the side wall, and a connecting portion between the first and second portions. The second portion lies on a first plane and the first portion is displaced towards the base wall and is at least at a predetermined distance from the first plane, between the connecting portion and the side wall a seat being defined in which the ring is housed at least partially.

1 . A capsule comprising:
 a casing which extends about an axis, which casing comprises a base wall and a side wall defining a cavity containing an initial product to be combined with a fluid to obtain a final product, and a flanged edge extending from said side wall and comprising an annular bead;   a covering element, fixed to the flanged edge so as to close the cavity;   a sealing element, associated to the flanged edge to make a fluidic seal with a dispensing machine; wherein   the casing is made of aluminium and the sealing element comprises a cellulose-based ring; and wherein   the flanged edge comprises a first portion which comprises the annular bead, a second portion, contiguous to the side wall, and a connecting portion, between the first portion and the second portion; wherein the second portion is annular and lies on a first plane and the first portion is displaced towards the base wall and is at least at a predetermined distance from the first plane, between the connecting portion and the side wall being defined a seat in which, at least partially, the ring is housed.   
     
     
         2 . The capsule according to  claim 1 , wherein the first portion is contained in a half-space facing towards the base wall, which half-space is defined by a second plane which is located at said predetermined distance. 
     
     
         3 . The capsule according to  claim 2 , wherein the first portion comprises an annular part, which is contiguous to the connecting portion and is planar, the annular part lying on the second plane. 
     
     
         4 . The capsule according to  claim 1 , wherein said predetermined distance is comprised between 0.10 mm and 0.90 mm, still more preferably comprised between 0.20 mm and 0.60 mm, still more preferably equal to 0.30. 
     
     
         5 . The capsule according to  claim 1 , wherein the connecting portion has a curved conformation with a change of inclination or a stepped truncated-cone conformation. 
     
     
         6 . The capsule according to  claim 1 , wherein the ring comprises an outer zone which extends at least up to abutting on the connecting portion. 
     
     
         7 . The capsule according to  claim 6 , wherein the ring is retained associated to the casing by interference between the outer zone and the connecting portion and/or the annular bead. 
     
     
         8 . The capsule according to  claim 6 , wherein the outer zone abuts on the connecting portion and is flexed towards the base wall, the ring comprising a planar inner zone from which the flexed outer zone extends. 
     
     
         9 . The capsule according to  claim 1 , wherein the ring comprises an inner zone which extends at least up to abutting on the side wall of the capsule and is planar. 
     
     
         10 . The capsule according to  claim 9 , wherein the ring is retained associated to the capsule by interference between the inner zone and the side wall. 
     
     
         11 . The capsule according to  claim 1 , wherein the ring comprises a single layer of cellulose-based material intended to contact the dispensing machine. 
     
     
         12 . The capsule according to  claim 11 , wherein the ring additionally comprises a joining layer configured to enable the joining of the ring to the flanged edge. 
     
     
         13 . The capsule according to  claim 12 , wherein the layer and the flanged edge are joined to one another by means of the joining layer. 
     
     
         14 . The capsule according to  claim 1 , wherein the ring comprises a layer made of cellulose-based material intended to contact the dispensing machine and in addition a joining layer configured to enable the ring to be joined to the flanged edge; the ring further comprising a further layer of cellulose-based material and a further joining layer, the further joining layer joining the cellulose-based layer and the further cellulose-based layer to one another, the further cellulose-based layer and the flanged edge being joined to one another by the joining layer. 
     
     
         15 . The capsule according to  claim 1 , wherein the sealing element comprises a further cellulose-based ring, the further cellulose-based ring being fixed to the covering element on the side opposite the flanged edge. 
     
     
         16 . The capsule according to  claim 15 , wherein the further ring is aligned with the ring so as to form a stratified sealing element, in which the second portion and the covering element are inserted between the ring and the further ring, arranged opposite and facing one another. 
     
     
         17 . The capsule according to  claim 1 , wherein the ring has a thickness comprised between 0.30 mm and 1.2 mm, preferably comprised between 0.55 mm and 1.10 mm, still more preferably comprised between 0.70 mm and 1.00 mm, preferably 0.90 mm. 
     
     
         18 . The capsule according to  claim 1 , wherein the ring can be made, for example, of paper or cardboard, with a grammage comprised between 250 g/m2 and 900 g/m2, preferably comprised between 300 g/m2 and 750 g/m2. 
     
     
         19 . The capsule according to  claim 18 , wherein the grammage of the single layer is equal to 700 gr/m2. 
     
     
         20 . The capsule according to  claim 18 , wherein the layer and the further layer have a grammage equal to 350 gr/m2.