Antimicrobial Microcapsule Coating for Value Documents
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Solution Overview
Problem
Existing antimicrobial coatings on value documents, such as banknotes, lose their effectiveness over time due to diffusion processes, leading to reduced circulation duration and increased risk of contamination and disease transmission.
Innovation Solution
A value document substrate with microcapsules containing disinfectants that break open under mechanical stress or energy exposure, releasing antimicrobial agents like phenol, quaternary amines, or metallic nanopigments, combined with additional antimicrobial agents like 1,2-benzisothiazole-3(2H)-one, to extend the antimicrobial effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional antimicrobial coatings are applied to value documents, then antimicrobial protection is provided, but the coating loses effectiveness over time due to diffusion processes
Solution Approach 1:
The antimicrobial protection is segmented into multiple microcapsules distributed throughout the coating layer. Each microcapsule contains a discrete amount of antimicrobial agent, and as they break down individually over time, they provide sustained release of antimicrobial protection throughout the entire circulation period of the value document.
Solution Approach 2:
The physical state of the antimicrobial agent changes from solid crystalline form in the microcapsule to dissolved or dispersed form upon capsule breakdown. This parameter change enables controlled release of the antimicrobial agent into the coating matrix, maintaining effectiveness over extended periods without rapid diffusion loss.
2Object-affected harmful factors
If antimicrobial agents are introduced into the substrate during lending, then antimicrobial protection is achieved, but the coating consumes effectiveness through diffusion
Solution Approach 1:
The microcapsule serves as an intermediary carrier between the antimicrobial agent and the environment. It controls the release of the antimicrobial agent by breaking down through mechanical stress or aging, preventing rapid diffusion loss while maintaining protective function against microbial contamination throughout the value document's circulation life.
3Reliability
If the coating provides antimicrobial protection, then disease transmission is prevented, but the protection diminishes over time
Solution Approach 1:
The microcapsules provide continuous antimicrobial protection by breaking down at different rates throughout the value document's circulation period. This ensures uninterrupted protective action against disease transmission, extending the effective circulation duration rather than allowing protection to diminish over time.
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 microcapsule-based coating system enhances the longevity of antimicrobial protection during storage, transport, and circulation, effectively inhibiting microbial growth and contamination, thereby increasing the circulation duration and safety of value documents.
Implementation Method 1
the capsule wall breaks out in the event of mechanical loads
Implementation Method 2
by the effect of energy -taking radiation
Implementation Method 3
disinfectant is used in combination with an additional antimicrobial means that preferably from the group consisting of 1,2-benzisothiazole-3 (bit), 3-iod-2-propinyl butylcarbamate (IPBC), a silver connection, a silver salt such as silver phosphate glass
Data Source
Figure 1
AI summary
The invention relates to a document substrate for the production of banknotes, identity documents or certificates, which is at least partially provided with an antimicrobial coating, characterized in that the coating has microcapsules containing disinfectant.