Method and device for introducing a security feature into a valuable document or security document

Abstract

The invention relates to a method and a device for introducing a security feature into a valuable document or security document (2), the valuable document or security document (2) comprising a document body (10) having at least one thermoplastic surface layer (8). The method according to the invention comprises the following steps: making a document body (10) available; making available and / or producing a structured sonotrode (3) that has been or is coupled to a sound source (4); arranging the document body (10) relative to the sonotrode (3); contacting the sonotrode (3) and the surface layer (8) of the document body (10) and at the same time coupling sound waves into the valuable document or security document (2) via the sonotrode (3) in such a manner that a relief structure is formed in the surface layer (8), the sonotrode (3) being made available and / or being produced with a structured feature, that structured feature having a desired penetration plane (15) and the sonotrode (3) being structured in such a manner that portions projecting from the desired penetration plane (15) and recessed portions projecting into the desired penetration plane (15) are present. The sonotrode (3) is displaced into the document body (10) during the coupling in of sound while applying pressure until the desired penetration plane (15) coincides with a desired document body surface level (17) and the projecting portions (12) produce recessed relief structures (20) and the recessed portions (13) produce projecting relief structures (19) in the surface layer (8).

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 and a device according to the preamble of claim 5 . In particular, the invention relates to a method and a device for introducing security features into a value or security document, wherein the value or security document comprises a document body having at least one thermoplastic surface layer. The relief structure is introduced into the thermoplastic surface layer by means of an embossing die, which is formed in the sonotrode. The sonotrode is coupled to a sound source, so that the thermoplastic surface layer is deformed during the coupling of sound via the sonotrode. Background technique [0002] A value document and / or a security document is a document which has at least one security feature which should make counterfeiting, counterfeiting or duplication difficult or impossible. Several safety features for this purpose are already known from the prior art. Part of the securit...

AI Technical Summary

Problems solved by technology

Additionally, these laminates are subject to high levels of wear and tear

Especially when producing small batches of valuable or security documents, the cost of adding relief structures is often not justified

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