| 摘要 |
The lid (20) of the invention comprises, in a single piece of metal sheet, a bottom wall (21) incorporating, superiorly and peripherally, a side wall (22) to be frictionally seated and axially retained in the can (10). The bottom wall comprises a peripheral annular portion (23) adjacent to the side wall (22), a median portion (24) and an annular rib portion (25) having a cross section with the approximate form of an inverted "U" having the lateral legs thereof respectively incorporated to adjacent edges of the peripheral annular portion (23) and median portion (24) of the bottom wall (21). The peripheral annular portion (23) of the bottom wall (21) incorporates, in its median portion and in a single piece, at least one embossed circumferential rib (26), generally in the form of an inverted U, formed by a material that is plastically deformed from said peripheral annular portion (23). |
