Disposable capsules are known since time of the type comprising a container having an plane openable or punchable base for the introduction of water and a closed plane base from a plane filter, protected by a peelable film before use, through which the beverage produced by infusion of water with the aromatic substance present in the container is delivered.
It is known that such capsules, due to their conformation, can negatively affect the correct execution of the infusion, with a consequent penalization of the organoleptic characteristics of the produced beverage.
This is often due to the characteristics of the filter, having a surface extension sometimes insufficient, being substantially equal to that of the plane base of the container to which it is applied.
With particular reference to capsules for American coffee, which require an extraction procedure of the aroma purely by percolation, the filter, if having an insufficient surface, tends to obstruct and form a non desired overpressure inside the container. The provision of a greater filtering surface in a known disposable capsule would require a more bulky container in a transversal direction, which in turn would require specifically dimensioning also the infusion chamber in which the capsule is housed.