APPARATUS FOR ORIENTING MAGNETIC FLAKES

A printing apparatus includes a magnetic rotatable roller (710, 810) with a smooth even outer surface for aligning magnetic flakes in a carrier, such as an ink vehicle or a paint vehicle to create optically variable images in a high-speed, linear printing operation. Images can provide security featu...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	MARKANTES, Charles T, HOLMAN, Jay M, RAKSHA, Vladimir P, COOMBS, Paul G, PHILLIPS, Roger W
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TO SURFACES, IN GENERAL COLOUR PRINTING LINING MACHINES OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PERFORMING OPERATIONS PHYSICS PRINTING PRINTING MACHINES OR PRESSES PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES PROCESSES FOR APPLYING LIQUIDS OR OTHER FLUENT MATERIALS TOSURFACES, IN GENERAL SPRAYING OR ATOMISING IN GENERAL STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	A printing apparatus includes a magnetic rotatable roller (710, 810) with a smooth even outer surface for aligning magnetic flakes in a carrier, such as an ink vehicle or a paint vehicle to create optically variable images in a high-speed, linear printing operation. Images can provide security features on high-value documents, such as bank notes. Magnetic flakes in the ink are aligned using magnetic portions of the roller (710, 810), that can be formed by permanent magnets embedded in a non-magnetic roller body, or selectively magnetized portions of a flexible magnetic cover of the roller. Selected orientation of the magnetic pigment flakes can achieve a variety of illusive optical effects that are useful for decorative or security applications.