Patent ID: 6688832
Filing Date: 2004-02-10
Classification: B21D,B65D

Abstract:
A method of making an easy-open end for a container, comprising steps of:(a) providing a can end having a peripheral edge and a panel, said panel having opposing first and second sides with said first side adapted to face toward the inside of a container when said end is affixed thereto; (b) forming first and second grooves in said panel spaced from said peripheral edge, said grooves extending below the level of said first side to form inner and outer beads; (c) forming a central bead in said panel between said first and second grooves, said central bead extending above the level of said second side with inner and outer shoulders that are unitary with said inner and outer beads, respectively; (d) forming a score along said central bead by using an annular scoring punch and an annular anvil that is shaped and sized to fit between said inner and outer beads, said annular scoring punch including an annular scoring projection and at least one pressing surface, said annular scoring punch and annular anvil interacting by simultaneously forming the score and compressing the central bead, whereby the depth of the score and the thickness of the central bead are both positively controlled and so that a predetermined amount of material migrates from said central bead into said inner and outer shoulders; (e) forcing said inner and outer beads toward each other and then toward said first side and said central bead toward said second side until said inner and outer beads abut said central bead; and (f) fixing a pull-tab to said end, said pull-tab having means for severing said end along said score.