Laser marking of articles

B - Operations – Transporting – 41 – M

Patent

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Details

B41M 5/24 (2006.01) B23K 26/18 (2006.01) B41J 2/435 (2006.01)

Patent

CA 2281503

A method of marking or forming a transparent window in an article (6), such as a security document, is provided in which areas of opacifying layers of printed ink (8, 10) on opposite surfaces of a polymeric film or substrate (12) are irradiated by laser radiation (4) of a selected wavelength. The opacifying layers (8, 10) have greater absorption characteristics for the laser radiation than the film or substrate (12) which is substantially transparent to the selected wavelength of the laser radiation so that after ablation of the area of printed matter (8) on one surface, the radiation passes through the substrate (12) substantially unaffected to ablate the area of printed matter (10) on the opposite surface. In the resultant article, the markings or windows formed by the areas of printing removed from each surface of the substrate (12) are in register, and provide a deterrent against counterfeiting.

L'invention concerne un procédé de marquage ou de formation d'une fenêtre transparente dans un article (6), tel qu'un document de sécurité, dans lequel les zones de couches opacifiantes d'encre imprimée (8, 10) sur des surfaces opposées d'une pellicule polymère ou substrat (12) sont irradiées par rayonnement (4) laser d'une longueur d'onde sélectionnée. Les couches opacifiantes (8, 10) présentent des caractéristiques d'absorption plus grande pour le rayonnement laser que la pellicule ou le substrat (12) qui est pratiquement transparent à la longueur d'onde sélectionnée du rayonnement laser de façon à ce qu'après l'ablation de la zone de matière imprimée (8) sur une surface, le rayonnement traverse le substrat (12) pratiquement intact pour produire une ablation de la zone de matière imprimée (10) sur la surface opposée. Dans l'article résultant, les marques ou fenêtres formées par les zones d'impression éliminées de chaque surface du substrat (12) coïncident et ont un effet dissuasif vis-à-vis de la contrefaçon.

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