Security Document Resistance Testing with Standardized Test Fluids
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Solution Overview
Problem
Security documents and data carriers used in medical environments are vulnerable to disinfectants, which can impair their readability and security features, and existing methods do not effectively simulate realistic exposure conditions to assess their resistance.
Innovation Solution
A procedure using at least two different test liquids, including aqueous alcoholic solutions, hydrophobic compounds, and biocides, applied to a flat textile to simulate mechanical and chemical stress on the surface of security documents, allowing for the assessment of their resistance to disinfectants without exposing them to various market disinfectants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If security documents are tested with multiple different disinfectants from the market, then the assessment of resistance becomes more comprehensive, but the complexity and number of tests increases significantly
Solution Approach 1:
The patent transforms the test approach by changing the parameters of the test liquids from using multiple different market disinfectants to using a standardized set of test liquids with defined compositions (isopropyl alcohol, ethanol, hydrophobic compounds, biocides). This allows comprehensive resistance assessment while maintaining controlled and reproducible test conditions, resolving the contradiction between comprehensiveness and complexity.
Solution Approach 2:
Instead of testing with actual market disinfectants, the patent creates simplified copies or models of disinfectant effects using standardized test liquids that replicate the essential chemical properties and mechanisms of real disinfectants. This enables comprehensive resistance testing without the complexity of using numerous different commercial products.
2Measurement precision
If security documents are exposed to realistic disinfectant conditions, then the test results better reflect actual usage, but the documents may suffer greater impairment
Solution Approach 1:
The patent applies partial action by using test liquids that simulate the essential impairing effects of disinfectants without using full-strength commercial products. The test liquids are designed to replicate specific chemical mechanisms (alcohol content, hydrophobic compounds, biocides) at controlled concentrations, providing realistic impairment while maintaining document functionality for assessment.
3Adaptability or versatility
If thermal transfer or thermal sublimation printing is used for personalization, then the documents can be customized, but the printed surfaces become more vulnerable to disinfectant damage
Solution Approach 1:
The patent recognizes that different regions of the security document have different qualities - the printed personalization areas are more vulnerable to disinfectants than the base material. The test methodology specifically targets these vulnerable printed regions with standardized test liquids, allowing assessment of the localized impairment while preserving the overall document functionality and personalization capability.
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
This method enables the reliable and reproducible assessment of the long-term suitability and durability of security documents under realistic disinfectant exposure conditions, reducing the risk of impairment and ensuring the longevity of personalization and security features.
Implementation Method 1
scrubbing the surface of security documents or data carriers with textile pieces that are previously wetted with a test liquid
Implementation Method 2
the at least two different test liquids are selected from the groups of aqueous alcoholic solutions, liquids containing hydrophobic compounds and solutions containing biocides
Data Source
AI summary
The invention relates to a method for checking the resistance of security documents and data carriers in relation to disinfecting agents, wherein the surface of security documents or data carriers with flat textile parts that have previously been wetted with a test fluid are scrubbed under defined conditions, wherein the scrubbing test is carried out with at least two different test fluids and the at least two different test fluids are selected from groups of aqueous alcoholic solutions, fluids containing hydrophobic compounds and a solution containing biocides. The invention also relates to a set of test fluids.