| 摘要 |
The method for necking a metal container body comprises the steps of reducing a first portion of the sidewall of the container body to a first necked diameter, applying force to create tension in at least a portion of a second portion of the sidewall, and further reducing the first portion of the container body to a second necked diameter, during at least a portion of the applying step, by effecting relative motion between the container body and an external forming member. The step of applying a force to create tension in the sidewall may comprise radially displacing at least part of the shoulder portion outwardly away from the central longitudinal axis. Such radial displacement may entail positioning a first rotatable support member inside the container body with a forming radius of the support member longitudinally positioned to be misaligned with the shoulder radius of the container body, and moving the support member radially outwardly away from the central longitudinal axis until at least a portion of the shoulder portion is displaced radially outwardly.
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