METHOD OF FORMING A METAL CONTAINER BODY

摘要

A method of forming a metal container body comprising drawing a metal cup (12) having a sidewall and a base wall with an upwardly projecting boss in the base wall, said boss having a transverse wall (14) and an annular wall portion (15) adjacent the sidewall of the cup (12), and reforming said base wall by rolling the metal in said annular wall (15) upwardly with respect to said transverse wall (14) to form a generally frusto-conical annular wall portion between said transverse wall (14) and said sidewall.