Apparatus and process of making magnetically readable cards
US5073221A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 22, 1989 |
| Grant date | Dec 17, 1991 |
| Priority date | — |
| Expiry date | Nov 22, 2009 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/24752
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
Magnetic stripes are applied to magnetically readable credit cards by incorporating the magnetic stripes in a cover sheet and laminating this cover sheet to a core stock sheet and then severing the laminated assembly into individual cards. The magnetic material bearing cover sheet is made by feeding the cover sheet without stripes continuously through a nip along with a plurality of tapes. Each tape is a laminate originally including a release layer, a magnetic layer, an adhesive layer, in that order, on a carrier layer. Heat and pressure applied to the nip releases the magnetic layer from the carrier layer and activates the adhesive layer to bond the magnetic layer of each tape to the original cover sheet, thus forming a stripe on the cover sheet. Distortion of the cover sheet by substantial shrinkage or wrinkling due to the heat effects resulting from the bonding operation are effectively eliminated by the use of a chill roller. In this regard, the nip is formed from a heated roller in juxtaposition to a reaction roller which contacts the cover sheet. The temperature of the reaction roller is controlled by surface contact with the chill roller to promote effective adhesive bondin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.