UV-Active Security Element With Moiré Gradient Transition
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Solution Overview
Problem
Current security elements for documents, such as banknotes and identification tools, face challenges in creating multi-color optical effects that are difficult to produce and counterfeit, particularly in providing sufficient contrast and visibility under UV light without requiring expensive embossing processes or precise alignment of printing layers.
Innovation Solution
A security element with a layered structure comprising at least two printing layers, where one layer consists of sinusoidal or straight lines in a first color with specific properties in both visible and UV light, and another layer consists of lines in a second color with different properties, creating a gradient color transition visible only under UV light, thereby enhancing security against counterfeiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If embossing processes are used to create security elements with contrast, then visibility and security effect are improved, but manufacturing cost and process complexity increase
Solution Approach 1:
The patent replaces the mechanical embossing system with a printing-based system using UV-active inks and Moiré effect. Instead of physically raising patterns through embossing, the invention uses optical interference between two printed layers to create the security effect, eliminating the need for expensive embossing equipment while maintaining visibility under UV light.
Solution Approach 2:
The invention changes the approach from mechanical modification (embossing) to optical parameter manipulation. By controlling the angular arrangement and spacing of lines in two printed layers, the Moiré effect produces the desired security pattern without mechanical intervention, reducing manufacturing complexity.
2Manufacturing precision
If precise alignment of printing layers is implemented, then security element quality is improved, but manufacturing difficulty and cost increase
Solution Approach 1:
The patent introduces a registration layer or reference marks as an intermediary element that facilitates alignment between the two printed layers. This intermediary provides visual or mechanical guides during the printing process, making precise alignment achievable without requiring extremely complex positioning systems or specialized manufacturing expertise.
3Adaptability or versatility
If multiple printing units are used to create multi-color effects, then color palette and security features are improved, but device complexity and production cost increase
Solution Approach 1:
The patent uses composite ink formulations with different UV-active components that react differently to UV illumination. By combining inks with varying fluorescent or phosphorescent properties, the invention creates multi-color security effects using a single or minimal number of printing units, reducing equipment complexity while maintaining color versatility.
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 provides a cost-effective, difficult-to-counterfeit security element with a multi-color optical effect visible under UV light, improving document security by making it challenging to reproduce or modify, while being inexpensive to produce and requiring less specialized knowledge and equipment.
Implementation Method 1
A security element with a layered structure comprising at least two printing layers, where one layer consists of sinusoidal or straight lines in a first color with specific properties in both visible and UV light, and another layer consists of lines in a second color with different properties, creating a gradient color transition visible only under UV light
Implementation Method 2
UV activity means that when exposed to UV light of a specific wavelength, typically ranging from 200 nm to 400 nm, for example, 254, 313, 365, and 400 nm, the ink emits light of a specific color
Data Source
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AI summary
The invention relates to a security element with a specific layered structure, where at least two printing layers with different properties in VIS and UV light are superimposed to achieve a multi-color gradient transition visible during verification using an ultraviolet (UV) lamp. The invention also relates to a method for making this security element.