| 摘要 |
A method of making an easy-open end for a container includes steps of forming first and second grooves in a panel of a can end blank, the grooves extending below the level of the panel to form inner and outer beads and forming a central bead in the panel between the first and second grooves so that the central bead extends above the panel. A score is then formed along the central bead by simultaneously forming the score and compressing the central bead, so that the depth of the score and the thickness of the central bead are both positively controlled. The inner and outer beads are then forced toward each other and then toward the panel, and the central bead is forced toward the panel. A pull-tab is then fixed to the end. This process permits the score residual to be controlled to a greater tolerance than the conventional processes, and is also more material efficient.
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