Adhesive Layer Crosslinking for Banknote Security
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Solution Overview
Problem
Existing security features in documents of value, such as banknotes, are vulnerable to environmental influences and counterfeiting due to the use of chemically stable materials, which can be easily extracted or destroyed, compromising their security and stability.
Innovation Solution
Incorporating chemically unstable inorganic feature substances into adhesive layers within the document structure, which are crosslinked to protect against moisture, solvents, acids, and bases, making it difficult to extract or destroy the features without damaging the document, thereby enhancing security against forgery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chemically stable security features are used, then the security features are easy to extract or destroy, but using chemically unstable inorganic substances provides better security against counterfeiting
Solution Approach 1:
The adhesive layer serves as an intermediary substance that chemically bonds to both the feature particles and the substrate, creating a secure matrix that prevents extraction of the feature material while maintaining its security properties
Solution Approach 2:
The security element combines chemically unstable inorganic feature substances with a chemically stable adhesive matrix, creating a composite structure where the stable adhesive protects the unstable features from environmental damage and extraction attempts
2Object-affected harmful factors
If feature substances are embedded in polymer materials, then protection against environmental influences is reduced, but embedding in adhesive layers provides sufficient protection through crosslinking
Solution Approach 1:
The adhesive undergoes chemical transformation from a liquid or soft state to a crosslinked gel or solid state, changing its physical and chemical parameters to achieve both protection of features and resistance to environmental factors
Solution Approach 2:
The adhesive layer provides localized chemical protection specifically at the interface between the feature particles and the environment, creating a protective microenvironment around each feature particle without requiring the entire substrate to have equivalent resistance
3Reliability
If additional protective coatings are applied to feature particles, then security is improved, but the process becomes more complex
Solution Approach 1:
The protective function is merged with the adhesive material itself, eliminating the need for separate protective coatings on individual particles. The adhesive layer provides both bonding and protection in a single integrated solution
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 use of chemically unstable inorganic substances in adhesive layers provides robust protection against environmental influences and counterfeiting attempts, ensuring the security features remain intact and difficult to extract or replicate, thereby improving the security of documents of value.
Implementation Method 1
after three-dimensional crosslinking of the adhesive against harmful environmental influences
Data Source
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AI summary
The invention relates to a value document substrate for producing value documents, in particular bank notes, comprising at least a carrier layer and a first cover layer, wherein the first cover layer is a film layer and the carrier layer is a paper layer or a film layer and the carrier layer is connected to the first cover layer by means of at least one adhesive layer and the adhesive of the at least one adhesive layer contains a chemically unstable inorganic characteristic substance and stabilizes said characteristic substance against harmful environmental influences, in particular with respect to moisture and/or oxygen and/or solvent and/or acids and/or bases and/or oxidant and/or reductant, by means of the three-dimensional cross-linking of the adhesive.