Method for producing an easy-open lid for a container, and an easy-open lid for a container

A method for producing a lid for a container, the lid being adapted for closing the container, comprising:

• providing a preform of the lid (10), wherein the preform of the lid (10) has opposing first and second sides (11, 12), wherein the first side (11) faces towards an inside of the container when the lid (10) is affixed to the container;
• forming a score line bead (20) in the preform of the lid (10), wherein the score line bead (20) extends out of said second side (12) in an axial direction from said first side (11) towards said second side (12), the score line bead (20) comprising two radially spaced apart side wall portions (22, 24) and a bridge portion (26) connecting the side wall portions (22, 24) and forming a score line (30) in the bridge portion (26) of the score line bead (20) on said second side (12);
• at least partially thinning the two radially spaced apart side wall portions (22, 24) of the score line bead (20) resulting in elongated side wall portions (22, 24) of the score line bead;
• and
• flattening the score line bead (20) such that the two thinned side wall portions (22, 24) collapse;
• wherein flattening the bead (20) causes the two radially spaced apart thinned side wall portions (22, 24) to bend towards each other and form two opposite projections (32, 34), and the bridge portion (26) substantially maintains its original form and alignment with respect to said second side (12) after the score line bead (20) is flattened.