Manufacture of draw-redraw cans using film laminated or extrusion coated steel sheet material
US4450977A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 2, 1981 |
| Grant date | May 29, 1984 |
| Priority date | — |
| Expiry date | Apr 2, 2001 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/1359
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
The use of organic solvent-based coating compositions in the preparation of coated steel feedstock for use in the manufacture of retortable draw-redraw food and beverage cans is eliminated (A) by using as such can feedstock a laminated or extrusion coated steel sheet comprising a steel sheet material (e.g., such as electrolytic chrome/chrome oxide coated steel) having adhered to both major planar surfaces thereof a multilayered synthetic thermoplastic resin coating comprising (1) an adhesive synthetic thermoplastic resin inner layer (e.g., such as a layer of a normally solid random ethylene/acrylic acid copolymer) bonded directly to the surface of said steel sheet material and (2) an outer layer of a synthetic thermoplastic polymer resin which has a crystalline melting point of at least about 250.degree. F. and which is adhered to said adhesive resin inner layer and (B) by post-baking the coated can body formed in such draw-redraw process at a temperature above the melting point of the highest melting resin component of said thermoplastic resin coating.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.