Belt-driven processes for producing optical effect layers

Abstract

The present invention relates to the field of the protection of value documents and value commercial goods. In particular, the invention relates to printing devices and processes for producing optical effect layers (OEL) comprising magnetically oriented magnetic or magnetizable pigment particles. In particular, the present invention provides processes for producing said OELs as anti-counterfeit means on security documents or security articles or for decorative purposes. The printing devices comprise a) an orienting device comprising an orientation means, said orientation means being either a magnetic field generating belt or a non-magnetic belt comprising magnetic field generating elements, said belt being driven by at least two rollers, and b) a hardening unit.

Dependencies are inferred from the claim text.