Patent ID: 7350392
Filing Date: 2008-04-01
Classification: B21D,B65D

Abstract:
1. A method for strengthening an easy open can end member having a center panel positioned about a longitudinal axis perpendicular to a diameter of the center panel, the center panel including a closure member for sealing the end member, a portion of the closure member is retainable to a portion of the center panel once the easy open can end member is opened; a curl defining an outer perimeter of the end member; a circumferential chuck wall extending downwardly from the curl; and a transition wall joining the chuckwall to the center panel, comprising the step of: coining a peripheral edge of the central panel consisting of a planar portion; and forming a step portion along the peripheral edge of the center panel, the step portion having an annular convex portion joined to an annular concave portion and displacing at least a portion of the center panel vertically in a direction parallel to the longitudinal axis.