| 摘要 |
The purpose of the present invention is to ensure the lowering of an opening area as well as the generation of a resistance to an upper compression in closing lids while avoiding buckling-type mechanical deformation of the lowered area during the application of an extended and high-pressure compression from below. To this end, a sheet-metal closing lid for beverage cans comprises from the inside towards the outside a lid surface (10), a peripheral groove (20) and a seamed collar (21). At the level of the lid surface, a flat area (40) is adapted to the shape of a gripping tab (9) and of an opening area (8), and is in a lower position relative to the plane of the lid surface (10). This flat area (40) comprises elongated (42, 43) and short (45, 46) edge areas for defining the same relative to the non-lowered remaining part. One at least of the short edge areas (45) rises slightly ( alpha ) from the plane of the lowered flat area (40) towards the plane of the lid surface (10) located above so as to define a transition area capable of elastic deformation upon the application of an extended compression from the lower side of the lid. This invention also relates to a tool comprising a plurality of individual punches (G, R, H, S) for deforming the lid. |
