Arjowiggins Security

Yvan Thierry

Pierre Doublet

Michel Camus

Stéphane Mallol

Nathalie Vast

Stephane Mallol

The present invention relates to printable security paper that includes a region capable of receiving printed indicia on the front side and on the reverse side which are observable in reflected light and form an image observable in transmitted light, as security element protecting against two-sided copying, characterized in that such region is a screened region having an average overall opacity less than the opacity of the vellum part of the rest of the paper, said screened region being made up from alternations of vellum miniregions, having an approximately constant thickness equal to that of the vellum part of the rest of the paper, and of miniregions of reduced opacity because of their smaller thickness compared with the vellum miniregions. The invention also relates to the security document obtained with this paper.

Sheet with a copy-resistant region of reduced opacity

Paper based on a fiber composition and having at least one multitone-effect watermark. When observed in transmitted light, the watermark has a set of pale zones arranged in the manner of a screened image.

Paper including a multitone-effect watermark, and a wire for manufacturing the paper

Security paper () has a security zone () for providing protection against mechanical falsification. The security zone comprises a set of cells () indented in the paper and optionally interconnected by indented link portions, the thickness of the paper being substantially uniform throughout its area that is complementary to the cells () and to the link portions in the security zone ().

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Jouy sur Morin, France

Yvan Thierry