Method for producing an aluminium foil with integrated security features

US9649676B2 · kind B2 · utility

Assignee

• Constantia Teich GmbH

Inventors

• Wilhelm Zuser · Pöchlarn, AT
• Adolf Schedl · Lilienfeld, AT
• Engelbert Scharner · Kilb, AT
• Lambert Nekula · Pöchlarn, AT
• Martin Kornfeld · Klosterneuburg, AT
• Rainer Huber · Piding, DE
• Christof Brunnthaller · Ybbs an der Donau, AT

Key dates

• Filing date: Oct 8, 2013
• Grant date: May 16, 2017
• Expiry date: Oct 8, 2033

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/24479
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

Method for producing an aluminum foil with integrated security features. An aluminum foil is rolled down to a thickness of less than 150 μm in a plurality of cold rolling passes, texturing that runs in the direction of rolling being induced simultaneously on both surface sides of the foil. In a final cold rolling pass, the foil is fed to a working roller pair, in which, on at least one roller surface, the relief-like surface structuring generated in the rolling direction by grinding was reduced on the basis of contrast and motif in a region of 10 to 50% relative to the average surface roughness to form a motif for a security feature that is transferred to the surface side of the foil facing the roller surface. The generated aluminum foil has a glossy appearance on both sides such that the security feature rises clearly due to its dull appearance.