Luminescent Security Marking Ink Layer Sequence
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Solution Overview
Problem
Current methods for producing multicolor or photorealistic luminescent security markings are time-consuming and expensive due to the need for developing new luminescent base printing inks that meet specific requirements for chemical stability, lightfastness, and miscibility, limiting the gamut of colors that can be produced.
Innovation Solution
A method involving a layer sequence on a substrate with a diffuse reflectance printing ink and a luminescent printing ink, where the luminescent spectrum is modified by the diffuse reflectance spectrum using a division parameter, allowing for the production of luminescent security markings with colors outside the traditional gamut, using existing inks and simplifying the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If new luminescent base printing inks are developed to expand color gamut, then color variety increases, but development time and cost increase
Solution Approach 1:
The patent combines luminescent printing ink with diffuse reflectance printing ink in a layered structure. The diffuse reflectance ink layer modifies the luminescence spectrum to achieve colors outside the traditional gamut, eliminating the need to develop new luminescent base inks for each color variation.
Solution Approach 2:
The invention uses a composite structure consisting of two distinct ink layers: a luminescent printing ink layer and a diffuse reflectance printing ink layer. This composite approach allows the system to achieve expanded color gamut by combining the optical properties of both materials rather than relying on a single ink type.
2Adaptability or versatility
If new luminescent base printing inks are developed to expand color gamut, then color variety increases, but development cost increases
Solution Approach 1:
The patent combines luminescent printing ink with diffuse reflectance printing ink in a layered structure. The diffuse reflectance ink layer modifies the luminescence spectrum to achieve colors outside the traditional gamut, eliminating the need to develop new luminescent base inks for each color variation.
Solution Approach 2:
Instead of developing new luminescent inks, the invention uses existing luminescent base printing inks and replicates expanded color effects through the addition of a diffuse reflectance layer, which modifies the optical output without requiring new ink formulations.
3Manufacturing precision
If layer thickness and ink selection are optimized to achieve specific luminescent spectra, then color precision improves, but process complexity increases
Solution Approach 1:
The patent utilizes parameters such as layer thickness, ink composition ratios, and optical density to precisely control the final luminescent spectrum. By adjusting these parameters within the two-layer structure, specific color outputs can be achieved without complex manufacturing processes.
Solution Approach 2:
The invention employs a computational model that calculates the expected luminescent spectrum based on the properties of the luminescent and diffuse reflectance inks. This model provides feedback to guide the selection of ink combinations and layer parameters, simplifying the optimization process while maintaining high precision.
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
Enables the production of luminescent security markings with expanded color gamut in a cost-effective and efficient manner, allowing for greater design freedom and integration into graphic designs without the need for new ink development.
Implementation Method 1
the luminescent printing ink with the selected luminescent layer thickness are printed on a substrate of the predetermined substrate type to obtain a luminescent security marking on the substrate which exhibits visible luminescence with a luminescent spectrum on illumination with non-visible excitation light
Implementation Method 2
a diffuse reflectance layer thickness and a luminescent layer thickness are selected, and a diffuse reflectance printing ink and a luminescent printing ink are selected
Data Source
AI summary
A method is provided for producing a luminescent security marking on a substrate of a predetermined substrate type. The security marking includes a layer sequence applied on top of the substrate in a part region and formed from a diffuse reflectance printing ink applied on top of the substrate and from a luminescent printing ink applied on top of the diffuse reflectance printing ink, or a mixture of a diffuse reflectance printing ink and a luminescent printing ink. The layer sequence or the mixture exhibit visible luminescence after excitation. The layer sequence or the mixture are printed with a chosen layer thickness onto a substrate of the predetermined substrate type, in order to obtain a luminescent security marking, the luminescent spectrum of which matches the calculated combination spectrum in the part region on illumination with the excitation light. The invention also relates to an associated luminescent security marking.