Biocidal Silver Ink for Pathogen-Resistant Currency
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Solution Overview
Problem
Current currencies do not effectively inhibit the spread of viruses and bacteria, as they lack antiviral properties, which are crucial for reducing disease transmission through contact with currency in circulation.
Innovation Solution
Incorporating biocidal silver or silver compounds, such as elemental silver, silver oxide, silver nanoparticles, or silver salts, into the ink formulations for printing currency or into the pulp mixture during paper production to create a viricidal and bactericidal surface, utilizing methods like offset and intaglio printing to ensure the silver is embedded within or on the currency substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional printing inks and paper substrates are used for currency production, then manufacturing cost and ease of production are maintained, but the currency lacks antiviral and antibacterial properties, allowing pathogen transmission
Solution Approach 1:
The patent incorporates biocidal silver compounds (silver nanoparticles, silver oxide, silver salts) into conventional printing ink formulations to create composite biocidal inks. These composite materials combine the printing functionality of traditional inks with the antiviral and antibacterial properties of silver compounds, allowing currency to gain protective properties without fundamentally changing the printing process or substrate materials
Solution Approach 2:
The patent modifies the chemical composition parameters of printing inks by adding silver compounds at specific concentrations (e.g., silver nanoparticles at 0.1-10 wt%, silver oxide at 1-20 wt%). These parameter changes enable the ink to acquire biocidal properties while maintaining printability and compatibility with existing currency printing infrastructure
2Reliability
If biocidal silver compounds are incorporated into ink formulations, then antiviral and antibacterial properties are achieved, but manufacturing complexity and processing difficulty increase
Solution Approach 1:
The biocidal silver compounds are pre-mixed into the ink formulation before the printing process. This preliminary incorporation ensures that the currency substrate is already protected with antiviral and antibacterial agents during printing, eliminating the need for separate post-printing treatment steps and simplifying the overall manufacturing process
Solution Approach 2:
The biocidal ink formulation serves multiple functions simultaneously: it provides printing functionality, delivers antiviral protection, and provides antibacterial protection. This multi-functionality allows a single printing process to achieve both currency production and pathogen prevention, reducing the need for additional manufacturing steps
3Reliability
If silver compounds are added to ink formulations, then antiviral effectiveness is improved, but the cost of material and manufacturing increases
Solution Approach 1:
The patent optimizes the concentration parameters of silver compounds in the ink formulation to achieve effective biocidal activity at minimal concentrations. By carefully controlling the amount of silver nanoparticles, oxide, or salts added to the ink, the formulation achieves viricidal and bactericidal effectiveness while minimizing material cost and maintaining printability
Solution Approach 2:
The biocidal silver compounds are concentrated specifically in the ink layers that come into contact with the currency surface, providing localized protection where it is most needed. This localized application ensures effective pathogen neutralization at the currency surface without requiring high concentrations of silver throughout the entire substrate, reducing overall material usage
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 resulting biocidal currency effectively neutralizes or destroys surface bacteria and viruses, reducing the spread of diseases by providing both antibacterial and antiviral properties, making it a crucial measure in preventing the transmission of pathogens like COVID-19 and other viral infections.
Implementation Method 1
It is well known that preparations of silver exhibit germicidal properties. Silver and silver compounds have been used as antimicrobial agents since the property was discovered by the Romans, who recognized the bactericidal or bacteriostatic effect of silver drinking vessels.
Implementation Method 2
Recent studies, however, have established that silver, in various forms, also displays anti-viral activity.
Data Source
AI summary
Compositions and methods for making biocidal currency are disclosed. The compositions of the within invention contain biocidal silver or silver compounds, which include elemental silver, nanoparticulate silver, colloidal silver, inorganic silver, including silver oxide, silver compounds and silver salts, that exhibit antibacterial and/or antiviral properties. Ink formulations that are used in the printing of currency, such as offset printing and intaglio printing, which incorporate the biocidal silver are also disclosed. In addition, the biocidal silver is formulated within pulp mixtures during the currency paper or linen-making processes. Methods of employing the biocidal silver or silver compounds of this invention include high pressure engravement printing where the silver impregnates the fiber, being cellulosic fiber, cotton or linen, forming a permanent biocidal layer within or on the surface of the currency, and offset printing.