PROCESS FOR THE MANUFACTURE OF AN ALUMINUM FOIL WITH INTEGRATED SECURITY FEATURES

摘要

The invention relates to a method for producing an aluminum foil (1) and to an aluminum foil with integrated security features (6). An aluminum foil (4) is rolled to a thickness of less than 150 µm in multiple cold rolling passes, and simultaneously a texture (5a, 5b) which runs in the rolling direction is produced on both faces (4a, 4b) of the aluminum foil. A loose composite (8) is formed from at least two of said aluminum foils (4), and the composite is fed into a pair of working rollers (9) in a final cold rolling pass, wherein the relief-like surface structure (11a) which is produced in the rolling direction by means of a polishing process has been reduced by 10 to 50% with respect to the average roughness height in one region (6') in a contrast- and motif-dependent manner on at least one roller surface (11) in order to form a motif for a security feature (6). The security feature is transferred onto the aluminum foil face (2a) that faces the roller surface, and the loose composite (8) of aluminum foils (1, 4') is then separated.