Ink-Free Polymer Banknote Security via Nanostructure Optical Effects
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current anti-counterfeiting methods for polymer-based banknotes are costly and lack effective, inexpensive techniques to enhance security features, with existing methods relying on ink-based security features that can deteriorate over time, reducing the longevity and increasing manufacturing costs.
Innovation Solution
Ink-free anti-counterfeiting methods utilizing three-dimensional nano/micromechanical structures on polymer substrates that produce dynamic, visually distinctive optical effects in wet and dry environments, including structural colors and optical fuzziness, which can be altered by introducing a liquid, providing enhanced security features without the need for ink.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ink-based security features are used on polymer banknotes, then security features can be added, but manufacturing cost increases and the features deteriorate over time
Solution Approach 1:
The patent extracts the security function from ink-based features and relocates it to the polymer substrate itself through embossed microscale features. This removes the deteriorating ink layer while preserving security functionality, resolving the contradiction between durability and manufacturing cost.
Solution Approach 2:
The patent replaces the chemical/ink-based security system with a mechanical/physical system using embossed microscale features on the polymer substrate. This mechanical structure provides security through its physical geometry rather than ink composition, eliminating deterioration issues.
2Duration of action of stationary object
If polymer-based banknotes are used instead of paper-based, then longevity and durability are improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the security feature creation with the polymer substrate manufacturing process itself. By embossing features directly into the polymer during production rather than adding ink later, the security features become integral to the substrate, eliminating separate costly steps.
Solution Approach 2:
The polymer substrate serves dual functions: as the structural base material and as the carrier of security features. The substrate itself provides the security through its embossed geometry, eliminating the need for separate ink-based security layers.
3Reliability
If traditional anti-counterfeiting features are used, then security is provided, but the features are difficult for the public to recognize
Solution Approach 1:
The patent creates localized optical effects at specific microscale locations on the banknote. These localized features produce distinct visual patterns that are easy to spot and recognize, combining high security with public accessibility.
Solution Approach 2:
The embossed microscale features create optical effects including iridescence and color changes that are visually striking and easy to recognize. These optical phenomena provide clear visual cues for public verification while maintaining high security standards.
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 significantly increases the security and longevity of polymer-based banknotes by creating dynamic optical effects that are difficult to counterfeit, reducing manufacturing costs, and offering environmental benefits through recyclability, while being simple for the public to recognize.
Implementation Method 1
the plurality of reconfigurable structures have a geometry and configuration capable of providing an optical effect that is visible with the human eye
Implementation Method 2
the plurality of reconfigurable structures have a geometry and configuration to diffract light and cause an optical fuzziness of the underlying security information
Implementation Method 3
the plurality of reconfigurable structures are capable of altering its configuration and corresponding optical effect upon application of a liquid
Data Source
AI summary
A document and an Anti-counterfeiting method for use in such documents are described. Said document and Anti-counterfeiting method include introducing a plurality of raised nanoscopic to microscopic structures, here referred to as reconfigurable structures, formed over a polymer substrate to induce optical changes, such as structural color and/or optical fuzziness. Dynamic changes using liquids provide the anti-counterfeiting measures.