Polymer Layer Composite for Secure Document Anti-Forgery
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Solution Overview
Problem
Existing security and valuable documents, particularly those made of polycarbonate, face issues with delamination and forgery due to the use of printing technologies that do not adequately secure personalized and individualized features, leading to potential counterfeiting and falsification.
Innovation Solution
A polymer layer composite is developed with at least two cohesively connected polymer layers, one surface printed with an absorbing layer covering 50-95% of the area, and free surface areas forming windows or patterns, which enhances security features by preventing delamination and ensuring the document's integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If printing technology is used to apply personalized and individualized features to polycarbonate documents, then the flexibility and customization of the document is improved, but the document becomes susceptible to delamination and forgery
Solution Approach 1:
The patent applies a printing layer composed of polycarbonate binder and pigment to the polycarbonate substrate. This composite material approach ensures that the printed layer is chemically compatible with the substrate, preventing delamination while maintaining customization capabilities. The binder-pigment mixture creates a secure bond that resists separation attempts.
Solution Approach 2:
The patent specifies precise parameter ranges for the printing layer, including binder molecular weight (200-20,000), pigment concentration (1-50 wt%), and printing area fraction (50-95%). By controlling these parameters, the printing layer achieves optimal adhesion to the polycarbonate substrate while maintaining the desired visual characteristics and security properties.
2Reliability
If a printing layer is applied to cover 50-95% of the surface area, then the security against counterfeiting is improved, but the aesthetic appearance and visibility of features may be compromised
Solution Approach 1:
The patent allows different surface areas to have different printing densities and characteristics. The printing layer can be applied with varying pigment concentrations and binder ratios in different regions, enabling secure printed areas (50-95% coverage) while maintaining aesthetic quality in specific zones. This local variation in printing properties resolves the contradiction between security coverage and aesthetic appearance.
3Ease of manufacture
If conventional printing inks are used on polycarbonate, then the ease of manufacture is improved, but the layers become prone to delamination during lamination
Solution Approach 1:
The patent uses polycarbonate binder that is chemically homogeneous with the polycarbonate substrate. This homogeneity ensures that the printing layer integrates seamlessly with the substrate during lamination, preventing delamination. The matching chemical composition creates uniform adhesion throughout the layered structure, resolving the contradiction between ease of printing and layer stability.
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 effectively prevents delamination and enhances the security of the document by ensuring that personalized and individualized features remain intact, making counterfeiting and falsification practically impossible.
Implementation Method 1
at least one surface printed with an absorbing layer forming at least one printing area
Data Source
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AI summary
In order to create novel security features in secure and/or valuable documents, the invention proposes a polymer layer composite (1, 2, 3), which has at least two polymer layers that are bonded to each other in a material fit, wherein at least one surface printed with an absorbing printed layer (5) within the visible region in and/or on the composite is located on a polymer layer of the composite, the absorbing printed layer forms at least one printed region, and all printed regions of the printed surface of the polymer layer have a total surface area of at least 50% and not more than 95%.