| 摘要 |
PCT No. PCT/GB94/02620 Sec. 371 Date Jun. 4, 1996 Sec. 102(e) Date Jun. 4, 1996 PCT Filed Nov. 30, 1994 PCT Pub. No. WO95/15227 PCT Pub. Date Jun. 8, 1995A metal container has a bottom wall and side wall provided with a low relief pattern of shallow grooves or creases to define outwardly convex panels. The grooves or creases have a depth between 0.3 and 3% of the radius of the side wall which has a thickness between 3 and 30% of the radius of grooves. A method and apparatus are described in which the pattern of grooves and panels is formed progressively by a pinch pressure imposed by a mandrel inside the container body and an arcuate rail provided with teeth to define grooves. Preferably, the pinch pressure sets the cross-sectional shape of the groove pulling the panels to shape by elastic deformation. |
