VERFAHREN ZUM DRUCKEN EINES SICHERHEITSELEMENTS UND SICHERHEITSELEMENT

摘要

The process involves printing a semi-transparent security unit (2) with variable optical ink on a base (1) of a substrate. The security unit is printed to cover the base. The semi-transparent security unit is printed by a serigraphy process. A sifter utilized in the serigraphy process comprises 180 to 230 lines per inch according to X and Y directions of the sifter. An Independent claim is also included for a value-paper.