Cans for carbonated and non-carbonated beverages, closure systems for them and method to open the cans

A method of opening a can for carbonated and non-cabonated beverages having an upper wall with a center point and a periphery, provided with an opening system comprising a tearable tongue (22) defined by a tearing starting score line in the outer surface of the upper wall of the can and having an elongated shape with an end apex point, characterised in that it comprises the following steps:

• providing a first tongue (30) attached to the outer surface of the upper wall of the can at an attachment point (32),
• providing a second tongue (31) having a ring like portion, superimposed upon said first tongue (30) and attached to said tearable tongue (22) at an attachment point (37) and having a beak like point portion (36), said attachment point (37) of said second tongue being aligned with an intermediate between said end apex point of the tearable tongue (22) and the attachment point (32) of said first tongue (30),
• starting tearing of said tearable tongue (22) by lifting the ring like portion of said second tongue (31) and rotating it around its attachment point (37) to said tearable tongue (22), from the center point to the periphery of the upper wall of the can, so that its beak like point portion (36) pushes the tearable tongue (22) at its end apex point inwardly of the can,
• completing tearing of the tearable tongue (22) and opening the can by inversely rotating said first tongue (30) from the periphery to the center point of the upper wall of the can around its attachment point (32) to the upper wall of the can, thereby upwardly pushing said second tongue (31) superimposed thereupon.