Patent ID: 8413478

Claim:
A method of drawing and ironing a resin film laminated metal sheet for forming a can body having a bottom portion, a can wall portion and a flange-forming portion by drawing the resin film laminated metal sheet obtained by laminating at least one surface of a metal sheet with an organic resin film, followed by ironing by using a punch, having a front end oriented toward the bottom of the can and a rear end, and a plurality of ironing dies neighboring each other, wherein the punch has no taper at a position corresponding to the flange-forming portion and has a taper formed at a position corresponding to the can wall portion that is continuous to the flange-forming portion, said taper comprises a two-stage taper including a first taper having a first taper angle and a second taper continuing to the rear end portion of the first taper and having a second taper angle different from that of the first taper angle, the first taper having a length greater than a distance between the land of a first ironing die and the land of a final ironing die of the plurality of ironing dies, and the diameter of the taper increasing toward the bottom of the can.