One-piece can bodies for pressure pack beverage cans
US6305210A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 12, 1996 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Aug 12, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D1/26
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
Method and apparatus are disclosed for fabricating a one-piece can body, with profiled closed end, from flat rolled steel of selected thickness gauge and tensile strength. Such steel substrate is electrolytically metal plated to facilitate sidewall ironing into an elongated sidewall can body for pressurized beverage packs. An axially-recessed bead is formed in the endwall of a drawn cup by pulling sidewall metal for movement into such endwall. That preformed bead being symmetrically positioned in the drawn cup such that a bodymaker redraw of the drawn cup positions sheet metal of the preformed bead so as to constitute a closed end angled portion, which extends from a circular configuration base support toward contiguous sidewall. Following subsequent sidewall ironing of the bodymaker redrawn cup, a substantially-planar endwall panel, radially inward of such base support, is formed into a concave dome by moving sidewall sheet metal into the closed end of the sidewall ironed can body, thus substantially avoiding thinning of closed end sheet metal and providing desired bulge and implosion resistance. Also, reforming steps for such closed end, subsequent to can body fabrication, are el…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.