Closure for containers with evidence of first opening

A closure for containers with evidence of first opening configured so as to be coupled to the mouth of a container according to an axial direction X-X′, comprising:

• an inner cap comprising:
• a main body;
• an inner thread complementary to a thread of either the mouth of the container or of a pouring element;
• fixing means adapted for being fixed to the container;
• breakable means adapted for connecting the main body and the fixing means, wherein these breakable means are adapted for breaking when a pre-established torque between the main body and the fixing means is surpassed in the operating mode;
• an outer cap configured for at least partially housing the main body of the inner cap;
• wherein a first part, either the inner cap or the outer cap, comprises a flange directed towards a second part other than the first part, either the outer cap or the inner cap;
• wherein the second part comprises:
• at least one groove with a helical segment according to the axial direction X-X′ configured for guiding the path of the flange of the first part such that a relative rotation between the first part and the second part brings about a mutual axial movement X-X′;
• a housing for the flange, the housing preferably located at one end of the helical segment;
• an elastically deformable prolongation configured for restricting the section of the groove in at least one part of the helical segment, with a section smaller than what is required for the passage of the flange such that, in the operating mode, the forced passage of the flange causes the elastically deformable prolongation to bend;
• and wherein the configuration of the groove is such that, after the flange reaches the housing, the flexible prolongation elastically recovers its initial position, partially or completely, irreversibly blocking the flange from coming out of the housing;
• wherein
• the torque required for the forced passage of the flange through the groove causing the elastically deformable prolongation to bend is less than the torque required for breaking the breakable means;
• and
• the first part and the second part comprise two end positions:
• a first position before the first opening in which the flange is located in the groove in a position away from the housing, and
• a second position after the first opening in which the flange is located in the housing after surpassing the segment of the groove restricted by the elastically deformable prolongation such that the first part and the second part are axially spaced with respect to the first position resulting in the irreversible separation between the first part and the second part, showing evidence of the first opening, and wherein said spacing is visually accessible.