| 摘要 |
The present lid includes a bottom wall incorporating a side wall to be seated and axially retained in the interior of a seat (S) defined by an opening of the can. The bottom wall includes a peripheral annular portion, a median portion and a rib portion with the approximate form of an inverted U and joining the peripheral annular portion and the median portion. The median portion includes an annular panel and a central panel joined to each other by an axial step portion, an outer peripheral edge of the annular panel being incorporated to the annular rib portion, said axial step portion being constituted by a material that is plastically deformed from the adjacent annular panel portion and from the central panel portion. |
