Abstract: A bottom profile for a cylindrical two-piece drawn steel can is configured during manufacture so that the resultant bottom profile shape includes areas of highly worked metal positioned to assume processing stresses. A bottom wall bead is included and has a prescribed cross-sectional configuration to provide maximum abuse resistance and to be functionally and operationally interchangeable in the packing and processing line with traditional three-piece containers. Moreover, the prescribed bead configuration works to improve stacking crush resistance by work hardening the metal adjacent the corner between the bottom and wall of the can.

Abstract: In a marking system for stamping materials such as aluminum strip, a pulse of determined energy is supplied to a solenoid, to impart a determined kinetic energy to a die. The die is guided to dissipate substantially all of this kinetic energy in the deformation of the material being stamped. The pulse of energy applied to the solenoid may be controlled by a programmable computer, programmed to control the duration of time that a current is applied to the solenoid. The computer may control a plurality of such solenoids, controlling the times and relative numbers of operation of each of the solenoids.