Patent ID: 9649676
Date: 2017-05-16
CPC Classifications: B21B,B42D,B44C,Y10T

Claim:
1. A process for the manufacture of an aluminum foil with integrated security features, comprising: rolling down a single aluminum foil in several cold rolling passes to a thickness of less than 150 μm, and at the same time on both outer faces of the aluminum foil creating a texturing extending in rolling direction is created, whereby the aluminum foil is fed into a working roller pair in a last cold rolling pass, in which on at least one roller surface the relief surface structure produced by grinding is reduced, depending on contrast and motif, in a range of 10-50% relative to an average depth of surface roughness, for formation of a motif for a security feature which is transferred to an outer face of the aluminum foil facing the roller surface.