| 摘要 |
2110987 9301093 PCTABS00019 A sheet wrapping material (F), such as, for example, thin aluminium foil, is preformed to a generally dished shape complementary to that of the product to be covered. Before it is formed into the dished shape, the sheet material (F) undergoes a pleating process (1, 2) which prevents ripping or tearing during the subsequent formation of the dished shape. |
