| 摘要 |
Cans (4, 41) having a cylindrical side wall (9, 91) joined to a can end wall by a double seam (8, 81) of diameter greater than the side wall are arranged on cardboard collater trays and shrink-wrapped with polymeric film to make a firm assembly. The tension in the film tends to pull cans together so that double seams of some cans override the double seams of adjacent cans. When the shrink wrapped assemblies are stacked on pallets and the pallets stacked one upon another the load on the overriding seams causes localised collapse of the side wall of the cans. In order to prevent collapse the side wall (9, 91) each can has an outwardly convex annular bead (15, 151) which keeps adjacent seams of cans apart so displaced cans may return to the collater tray before collapse loads develop. |
