Manufacturing method of shell for food cans, involves producing cylindrical starting shell and impositioning cornered shape using expansion tool, which includes column element

摘要

The manufacturing of shell involves producing cylindrical starting shell and impositioning N cornered shape on the shell, using an expansion tool. The tool comprises column elements (2) whose shape is imparted to the shell. The ratio of dimension between the column element and inner periphery of the contour satisfies the equation epsilon greater than 1 and gammaat leastepsilon, where epsilon and gamma are countered factors.