Metal can ends with metal pull tabs bonded thereto
US4946063A · kind A · utility
15Cited by
7References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 9, 1989 |
| Grant date | Aug 7, 1990 |
| Priority date | — |
| Expiry date | Jun 9, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29L2031/565
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A metal can end (10) has a metal pull tab (16) attached to a score-defined detachable portion (15) of the can end by direct welding of protective polymer coatings (19,20) whose surfaces at least are derived from the same monomer and which are provided on the upper side of the can and the under side of a shank portion (18) of the pull tab. The coatings may be composite films each comprising an inner layer of a bonding resin and an outer layer of a polyolefin, polyamide or polyester. The welding may be effected by heat or preferably by ultrasonic energy.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.