SECURITY DOCUMENT INCLUDING A MAGNETIC WATERMARK AND METHOD OF PRODUCTION THEREOF

摘要

One aspect of the present invention provides a method of producing a security document, including the steps of:(a) forming a sheet-like substrate of plastics material having first and second opposing surfaces,(b) coating a first layer of polymer material containing magnetic particles on the first opposing surface,(c) melting at least a portion of the first layer such that the magnetic particles can orient under the influence of a magnetic field,(d) applying the magnetic field so as to form a magnetic watermark, and(e) allowing the first layer portion to cool so as to fix the orientation of the magnetic particles