Improvements in and relating to security documents

Details Improvements in and relating to security documents Improvements in and relating to security documents

B - Operations, Transporting

41

M

B41M 3/14 (2006.01) B42D 15/00 (2006.01) D21H 21/42 (2006.01) G07D 7/04 (2006.01)

Patent

CA 2270354

A composite security thread, e.g. for a bank note, is produced by coating aluminium film onto a polyester film (11) and coating selected regions with magnetic material. Photoresist characters (14 to 18) are next printed onto the magnetic material, and a chemical applied to remove the aluminium coating except where protected by the resist. An obscuring silver coating (40) is then applied over the magnetic material, and a final transparent material applied as a barrier to reduce the risk of damage during subsequent processing.

Pour produire un fil de sécurité composite, destiné par exemple à un billet de banque, on applique une couche d'aluminium sur un film polyester (11) et on revêt des zones sélectionnées avec un matériau magnétique. Puis on imprime des caractères (14 à 18) en résine photosensible sur le matériau magnétique et on applique un produit chimique pour enlever le revêtement d'aluminium, à l'exception des endroits où il est protégé par la résine. On applique ensuite sur le matériau magnétique un revêtement en argent obscurcissant (40), ainsi qu'un matériau transparent final servant de protection, de façon qu'il ne soit pas abîmé durant le traitement ultérieur.

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