Core/Shell Particles for Tamper-Evident Security Documents
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Solution Overview
Problem
Current security documents lack comprehensive protection against counterfeiting and mechanical tampering, as existing methods fail to permanently visually indicate manipulation and verify authenticity effectively.
Innovation Solution
Incorporating core/shell particles that release a first chemical substance upon mechanical stress, causing an optically perceptible impression due to chemical interaction with adjacent substances, which can be detected visually or using a verification device, indicating manipulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional security features are used in security documents, then the documents have basic security protection, but they lack comprehensive protection against mechanical tampering and counterfeiting
Solution Approach 1:
The patent incorporates core/shell particles composed of multiple materials with different functions into the security document. The core contains a colorless or lightly colored polymer resin, while the shell contains a dye or pigment that becomes visible upon mechanical stress. This composite structure provides both mechanical tamper evidence and visual security features, resolving the contradiction between security reliability and feature complexity.
Solution Approach 2:
The core/shell particles are distributed throughout the security document, with each particle providing localized tamper evidence functionality. When mechanical stress is applied to any region, only the particles in that specific region release their dye, creating a localized visual indication of tampering. This allows comprehensive security protection without requiring the entire document structure to be complex.
2Reliability
If core/shell particles are incorporated to provide tamper evidence, then mechanical manipulation is visually indicated, but the manufacturing process becomes more complex
Solution Approach 1:
The core/shell particles are pre-formed and prepared separately before being incorporated into the security document. The core material (polymer resin) and shell material (dye/pigment) are combined in a controlled manner to create the encapsulated structure in advance, simplifying the subsequent integration process into the document substrate.
Solution Approach 2:
A binder or dispersant is used as an intermediary medium to facilitate the incorporation of core/shell particles into the security document. This binder ensures uniform distribution of the particles throughout the document material and provides proper adhesion, making the manufacturing process more manageable and consistent.
3Object-affected harmful factors
If the shell is designed to be damaged by mechanical action, then manipulation is detected, but the particles may be affected by other environmental factors
Solution Approach 1:
The shell material is specifically engineered with controlled mechanical properties, including optimized shell thickness and material composition, to ensure it responds to mechanical stress within a specific range while remaining stable under normal environmental conditions. The shell is designed to have sufficient strength to withstand handling but sufficient brittleness to fracture under tampering forces.
Solution Approach 2:
The patent converts the potential harm of particle instability into a benefit by designing the shell to be intentionally fragile. This controlled fragility ensures that any mechanical tampering, no matter how subtle, will damage the shell and release the dye, turning a potential weakness into a reliable tamper detection mechanism.
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 tamper-evident security feature that visibly indicates manipulation, ensuring the authenticity of security documents and preventing counterfeiting by creating a permanent, optically detectable change upon mechanical tampering.
Implementation Method 1
a first chemical substance, which, upon release from the core/shell particles, produces a visually perceptible effect, either directly or through chemical interaction with at least one second chemical substance
Data Source
Figure 1~3
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Figure 4A~6A
AI summary
The invention relates to the detection of manipulation of a valuable or security product (100), for example of a valuable or security document. According to the invention core/shell particles (200) are added to the valuable or security product, the shell (210) of which particles can be damaged or destroyed by mechanical action, such that at least one first chemical substance (250) that is contained in the core/shell particles (200) is released from the core/shell particles (200). When the first chemical substance (250) is released, the first chemical substance (250) creates, alone and/or owing to a chemical interaction with at least one second chemical substance (260) situated in the surroundings of the core/shell particles (200), a visible impression.