Process for producing resin-coated aluminum alloy sheet for drawn/ironed cans
US6267826A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 1, 1999 |
| Grant date | Jul 31, 2001 |
| Priority date | — |
| Expiry date | Apr 1, 2019 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2439/66
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
A method of manufacturing a resin-coated aluminum alloy sheet for drawn and ironed cans, which can be formed into a drawn and ironed can free from its wall breaking and having enough strength as a can, when it is formed through a composite forming process, the process including a bending and bending back operation at a die shoulder rounded portion of a small shoulder radius and a subsequent ironing operation, under dry condition; which comprises the steps of homogenization heat treating an aluminum alloy ingot containing essentially 0.5 to 2.0 wt % of Mn, 0.2 to 2.0 wt % of Mg, 0.05 to 0.4 wt % of Si and not more than 0.7 wt % of Fe as inevitable impurities, wherein (Si+Fe).ltoreq.0.9 wt %, and subjecting the aluminum alloy ingot to hot rolling to obtain an aluminum alloy sheet to continuous annealing or box annealing, cold rolling, and a surface treatment, heating the resultant sheet, and then coating both surfaces of the sheet with a thermoplastic resin at a predetermined temperature, and immediately quenching the sheet.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.