Apparatus and process of making magnetically readable cards

Details Apparatus and process of making magnetically readable cards Apparatus and process of making magnetically readable cards

1989-11-22

1991-12-17

Gallagher, John J.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

40626, 40630, 40632, 156155, 156235, 156238, 156239, 156282, 156303, 360131, 428167, 428189, B32B 3100

Patent

active

050732218

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 bonding while limiting shrinkage to the cover sheet in the order of less than 3%.

REFERENCES:
patent: 3497411 (1970-02-01), Chebiniak
patent: 4149925 (1984-04-01), Mintz
patent: 4231828 (1980-11-01), Mintz
patent: 4273603 (1981-06-01), Peronnet et al.

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