METHOD AND DEVICE FOR MANUFACTURING SYNTHETIC RESIN COATED METAL CAN BODY

摘要

A method and a device for manufacturing a synthetic resin coated metal can body capable of drawing and ironing the synthetic resin coated metal can body with a large processing rate without causing can body breakage. First and second ironings are applied to the side wall part of a redrawing step can (20) formed by drawing a thermoplastic resin double-coated aluminum plate (1) by a first ironing die (14) and a second ironing die (15) in that order according to the pressing-in of a punch (11) with such processing rates that the reduction rates for sheet thickness from an original sheet thickness come within the ranges of 35 to 55% and 60 to 75% for manufacturing a metal can body. Since the coated layer of a thermoplastic resin acts on a metal body part in a direction for preventing the metal body part from being broken (ruptured), processing conditions for ironing are relieved, and even if an ironing with a large sheet thickness reduction rate is performed, an ironing capable of maintaining quality is allowed without causing the can body breakage in a first step can (21) and a second step can (22).