Composite Body Internal Microperforations Security
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Solution Overview
Problem
Existing security documents can be manipulated by adding new channels or closing existing perforations, compromising their security against counterfeiting and forgery.
Innovation Solution
A composite body with internal microperforations is created by introducing microchannels in an inner material layer during production, which is then laminated with transparent or translucent substrate layers to enclose and protect the perforations, preventing further manipulation and ensuring the security feature is visible only in transmitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perforations are introduced into substrate layers for security purposes, then security against counterfeiting is improved, but the document becomes vulnerable to subsequent manipulation such as adding new channels or closing existing perforations
Solution Approach 1:
The perforations are nested within a hollow relief structure formed by evacuated recesses in the substrate layers. The perforations are enclosed within the hollow relief, creating a nested configuration where the security feature is protected within a protective structure, preventing external manipulation while maintaining security functionality
Solution Approach 2:
The hollow relief structure with evacuated recesses is created during the lamination process before the document is completed. This preliminary action of forming the protective structure in advance prevents subsequent manipulation of the perforations, as the enclosed structure is already in place to block any further modifications
2Reliability
If multiple substrate layers are laminated to enclose perforations, then protection against manipulation is improved, but the complexity of the composite body increases
Solution Approach 1:
Multiple substrate layers are merged into a single composite body through the lamination process, where the layers are bonded together to form an integrated structure. The hollow relief structure is formed by evacuating recesses across multiple layers, creating a unified protective enclosure that reduces the functional complexity despite maintaining multiple physical layers
Solution Approach 2:
Thin film substrate layers are used to form the composite body, where the layers are thin enough to allow light transmission for security feature verification but sufficient to provide structural protection. The flexible nature of these thin film layers allows them to be laminated together while maintaining a relatively simple overall structure
3Difficulty of detecting and measuring
If microperforations are created in opaque substrate layers, then security feature visibility in transmitted light is improved, but the substrate layers must be transparent enough to allow light transmission
Solution Approach 1:
The substrate layers have different optical properties in different regions: the areas with microperforations are more transparent to allow light transmission for security feature verification, while the surrounding areas maintain appropriate opacity for security purposes. The hollow relief structure with evacuated recesses creates localized transparency at the perforation sites without compromising the overall security characteristics of the document
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 a secure and tamper-proof security document with enhanced protection against counterfeiting, as the microperforations are embedded within a monolithic composite body, making it impossible to add or close perforation holes, and the pattern is visible only in transmitted light, enhancing verification and security.
Implementation Method 1
the substrate layers that are joined together, i.e. the opaque substrate layer and the transparent substrate layers connected to it in the lamination step
Implementation Method 2
in the high-pressure, high-temperature lamination process
Implementation Method 3
which can be verified in transmitted light
Data Source
Figure 1
Figure 2~4
Figure 5~7
AI summary
The invention relates to a composite body (11) and to a method for producing such a composite body (11) having an internal security feature. The method comprises the following steps: providing at least one opaque substrate layer; introducing microperforations (15) into the at least one opaque substrate layer; providing at least two further transparent and/or translucent substrate layers; bringing the at least one opaque substrate layer together with the at least two further substrate layers in such a way that the at least one opaque substrate layer is arranged between the at least two further substrate layers, wherein the at least one provided opaque substrate layer and the at least two further provided substrate layers are selected or produced in such a way that said substrate layers are formed on the basis of the same thermoplastic polymer material, and the substrate layers brought together are joined in a high-temperature, high-pressure lamination process to form the composite body (11), and thus the composite body is monolithically formed, and wherein an upper face (17) and a lower face (18) of the composite body (11) are flat at least in the area (19) of the internal microperforations (15).