Laser marking of pigment layers on documents

B - Operations – Transporting – 41 – M

Patent

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B41M 5/00 (2006.01) B42D 15/10 (2006.01) G07D 7/12 (2006.01)

Patent

CA 2663753

A laser markable document material comprises a binder sensitive to laser energy, a pigment interspersed in the binder, and a document substrate. One example of the pigment is a pearlescent silicate, which has optically varying effects. The binder is applied to the document substrate using a form of printing or other means of applying a coating. This coating provides a first indicia of fixed or variable information, such as the seal of the document issuer or personal information of a document bearer. A laser engraver writes a second indicia into the coating.

La présente invention concerne une matière pour documents pouvant être marquée au laser et comprenant un liant sensible à l'énergie laser, un pigment dispersé dans le liant et un substrat de document. Ce pigment peut par exemple être un silicate perlé présentant des effets optiques changeants. Le liant est appliqué sur le substrat de document au moyen d'un mode d'impression ou d'autres techniques d'application de revêtement. Ce revêtement produit une première inscription d'informations fixes ou variables, telle que le sceau de l'entité délivrant le document, ou des informations personnelles concernant le titulaire du document. Un graveur laser trace une deuxième inscription dans le revêtement.

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