A CAP FOR CLOSING A CONTAINER, A COMBINATION OF A CAP AND A NECK

A cap for a container comprises a side wall (2) extending about an axis (Z) and a transversal wall (3) arranged at an end of the side wall (2).A separation line (4) is provided on the side wall (2) for defining:- a retaining ring (5) intended to remain anchored to a neck (18; 218) of the container, and- a closure element (6) which can removably engage the neck (18; 218), so as to open or close the container.The separation line (4) extends about the axis (Z) and is circumferentially interrupted so as to leave a joining portion (8) between the retaining ring (5) and the closing element (6).The cap (1; 201) further has an incision line (21) which extends transversally to the axis (Z) between the separation line (4) and a free edge (16) of the retaining ring (5), so that between the separation line (4) and the incision line (21) two connecting bands (29, 30) are defined, the connecting bands (29, 30) joining the retaining ring (5) to the joining portion (8). The connecting bands (29, 30) have a radial thickness measured in a radial direction and a height (H) measured parallel to the axis (Z). The ratio between the height (H) and the radial thickness of the connecting bands (29, 30) is greater than, or equal to, 1.4 and is less than, or equal to, 6.5.