Security Foil Laminate Structure to Prevent Foil Reuse
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Solution Overview
Problem
Security foils in verifications can be reused to create fake verifications, making it difficult to distinguish between genuine and fake documents due to the reuse of the same security foil.
Innovation Solution
The laminate structure is designed such that the adhesion strength between the security foil and the recording layer is higher than that between the security foil and the front covering layer, with the security foil having a thickness of 1/5 or less than the recording layer, making it difficult to separate the foil without breaking it, and incorporating optical properties to enhance security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the security foil is made with standard thickness, then it is easy to separate and reuse, but it allows counterfeiting by reusing extracted foils
Solution Approach 1:
The patent changes the thickness parameter of the security foil to 1/5 or less of the recording layer thickness, and adjusts adhesion strength parameters through selective bonding. This makes the foil extremely thin and difficult to separate intact, preventing reuse for counterfeiting while maintaining authentication functionality.
Solution Approach 2:
The patent applies different adhesion strengths at different locations/interfaces: strong adhesion between the protective layer and recording layer, and weak adhesion between the relief layer and front covering layer. This localized quality difference ensures the foil remains attached to the genuine document but can be easily separated from counterfeit attempts.
2Strength
If the security foil is sandwiched between two layers, then it is protected from damage and separation, but it becomes difficult to prevent extraction and reuse
Solution Approach 1:
The patent changes the thickness parameter to extremely thin (1/5 or less of recording layer), which paradoxically provides protection while preventing reuse. The thinness makes the foil fragile and impossible to extract intact, thereby preventing counterfeiting while still providing structural protection within the laminate.
Solution Approach 2:
The patent segments the security foil into distinct functional layers (protective layer, relief layer) with different adhesion characteristics. This segmentation allows the protective layer to remain strongly attached to prevent extraction, while the relief layer's weak adhesion prevents intact removal for reuse.
3Stability of the object's composition
If the security foil has uniform adhesion to both layers, then it is stable in the laminate, but it allows complete separation and reuse
Solution Approach 1:
The patent applies different adhesion strengths at different interfaces: strong adhesion between the protective layer and recording layer, and weak adhesion between the relief layer and front covering layer. This localized quality difference ensures the foil remains attached to the genuine document but can be easily separated from counterfeit attempts.
Data Source
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AI summary
A laminate (10) includes a recording layer (11), a translucent front covering layer (12) and a security foil (20) laminated between the recording layer and the front covering layer and sealed in the laminate. The security foil has a thickness that is 1/5 or less the thickness of the recording layer to prevent or reduce falsification reusing the security foil. The security foil includes a relief layer (21) having a relief surface and a protective layer (22) covering the relief surface. In the thickness direction of the laminate, the protective layer adheres to the recording layer and the relief layer adheres to the front covering layer. The adhesion strength between the security foil and the recording layer is higher than the adhesion strength between the security foil and the front covering layer.