Method of manufacturing resin coated aluminum alloy plates for drawn and ironed cans

A method of manufacturing a resin-coated aluminum alloy sheet for a drawn and ironed can, comprising

• homogenization heat treating an aluminum alloy ingot containing 0.5 to 2.0 wt % of Mn, 0.2 to 2.0 wt % of Mg, 0.05 to 0.4 wt % of Si and not more than 0.7 wt % of Fe, wherein (Si+Fe)≦0.9 wt %,
• subjecting the heat treated aluminum alloy ingot to hot rolling to obtain a hot-rolled aluminum alloy sheet,
• subsequently subjecting the hot-rolled sheet to continuous annealing and cold rolling at a reduction ratio of 50 to 80%,
• subjecting the annealed and cold-rolled sheet to a surface treatment selected from the group consisting of at least one of etching and electrolytic chromic acid treatment,
• heating the thus surface treated aluminum alloy sheet to a temperature of 240 to 350° C. for not more than one minute,
• retaining the aluminum alloy sheet at a temperature of 220 to 300° C.,
• coating both surfaces of the sheet with a thermoplastic resin, and
• immediately quenching the thermoplastic resin coated aluminum alloy sheet.