Method of marking a material, marked material and...

D - Textiles – Paper – 21 – H

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Details

D21H 21/48 (2006.01) D21H 21/40 (2006.01) B41M 3/14 (2006.01)

Patent

CA 2579745

The invention relates to the marking of a material (18) with identifier marks (16), the material thus marked, and verification of the genuineness of a product on the basis of the marks. In accordance with the invention, an optical brightener is incorporated in the material (18), and marking is performed by reducing the brightness of the material at a selected location by directing local heating to this location, the mark (16) thus produced appearing with a darker shade than its environment in ultraviolet light (20). The marking is based on partial or complete destruction of the brightening effect of the optical brightener under heating. The invention is suitable for providing e.g. coated paper and board containing an optical brightener with identifier marks for preventing falsifications.

La présente invention a trait au marquage d'un matériau (18) avec des marques d'identification, au matériau ainsi marqué, et à la vérification de l'authenticité d'un produit en fonction des marques. Selon l'invention, un azureur optique est incorporé dans le matériau (18), et le marquage est réalisé par la réduction de la luminosité du matériau à un endroit choisi par l'orientation de chauffage local à cet endroit, la marque (16) ainsi produite apparaissant avec un ton plus sombre que son environnement dans la lumière ultraviolette (20). Le marquage est basé sur la destruction partielle ou complète de l'effet éclaircissant de l'azureur optique sous la chaleur. L'invention est appropriée pour l'obtention, par exemple de papier et de carton couché contenant un azureur optique avec des marques d'identification pour empêcher des contrefaçons.

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