Improvements in methods of manufacturing substrates

B - Operations – Transporting – 41 – M

Patent

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B41M 3/14 (2006.01) B42D 15/00 (2006.01) D21H 21/42 (2006.01) D21H 21/48 (2006.01)

Patent

CA 2474332

The present invention relates to improvements in methods of manufacture of substrates which can be used in varying shapes and sizes for various authenticating or security applications, which combine the advantages of indicia formed from metallisation or demetallisation of a security element and the colourshift effects of liquid crystal materials. The invention therefore provides a method of manufacturing a substrate comprising the steps of applying a darkly coloured resist to at least a part of a metallic layer on one side of a substantially transparent polymeric film, removing metal from areas not covered by the resist to form demetallised regions and applying a polymeric liquid crystal material over the resist and the demetallised regions.

L'invention concerne des améliorations de procédés de fabrication de substrats pouvant être utilisés dans différentes formes et tailles pour diverses applications d'authentification ou de sécurité, se caractérisant en ce qu'ils possèdent une empreinte formée par métallisation ou démétallisation d'un élément de sécurité et qu'ils peuvent changer de couleur grâce à la matière à cristaux liquides qu'ils comprennent. L'invention porte sur un procédé de fabrication d'un substrat, qui consiste à appliquer un résist de couleur foncée sur au moins une partie d'une couche métallique sur un côté d'un film polymère sensiblement transparent, à enlever le métal de zones non recouvertes par le résist, de manière que des zones démétallisées soient formées et à appliquer une matière à cristaux liquides sur le résist et les zones démétallisées.

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