Microstructured Metal Mesh Security Element for Tamper Detection
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Solution Overview
Problem
Existing security documents are vulnerable to counterfeiting and manipulation due to methods that treat one layer or surface at a time, leading to potential alteration or replacement of features, which weakens document stability and can be easily replicated.
Innovation Solution
A security element comprising a calendered metal mesh with laser-induced periodic microstructures is integrated into the document, forming optical gratings that vary with illumination and viewing angles, embedded within multiple layers to prevent removal without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perforation is used to affect multiple layers of the document, then security against tampering is improved, but the document's stability is weakened
Solution Approach 1:
The patent uses a metal mesh with intentionally created pores and openings as the security element. This porous structure allows the element to be embedded within multiple document layers while maintaining structural integrity. The pores provide security features that are difficult to replicate, yet the overall mesh structure remains stable and does not compromise document integrity when properly embedded.
Solution Approach 2:
The patent combines a metal mesh with document layers to create a composite security element. The metal mesh serves as both a structural component and a security feature, while the document layers provide protection and context. This composite approach allows the security element to be integrated into multiple layers without creating weak points that would compromise overall document stability.
2Reliability
If a security element is embedded within multiple layers, then counterfeit protection is improved, but the complexity of production increases
Solution Approach 1:
The metal mesh is pre-structured with specific pore patterns and dimensional characteristics before being embedded into the document layers. This preliminary structuring allows the security element to be prepared in advance with predetermined security features, simplifying the overall production process while maintaining high counterfeit protection when the mesh is integrated into multiple layers.
3Reliability
If laser-induced periodic microstructures are created on metal surface, then optical security features are improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent uses laser-induced periodic microstructures instead of traditional mechanical patterning methods. The laser creates precise periodic patterns on the metal mesh surface that generate optical security features. This approach achieves high manufacturing precision for the microstructures while being more scalable and less complex than traditional mechanical methods for creating such fine periodic patterns.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides enhanced counterfeit protection by making tampering detectable and ensuring the security element cannot be detached without destruction, thus verifying authenticity quickly and securely.
Implementation Method 1
In the surface (3) of the metal mesh (5), in particular of a calendered metal mesh, a structural element (21) is introduced which consists of a laser-induced periodic microstructure
Implementation Method 2
Such laser-induced periodic surface structures form optical gratings, which, among other things, allow the creation of structural colors
Data Source
Figure 1~3
Figure 4~5
AI summary
The invention relates to a security element (11) for use in a security document (10), comprising a preferably calendered metal mesh and/or a metal foil (5) provided with individualizing holes, in the surface (3) of which a structural element (21) is incorporated, which consists of a laser-induced periodic microstructure. The invention further relates to a security document (10) with such a security element (11) and to a method for producing the security document (10).