Fluorescent Toner Printing for UV-Activated Security Marks
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Solution Overview
Problem
Current electrophotographic color printing technologies using CMYK toners struggle to reproduce fluorescent colors, as they fall outside the color gamut, and existing solutions require designing and manufacturing specific fluorescent toners for each shade, which is time-consuming and costly.
Innovation Solution
Incorporating a fifth print module station with clear fluorescent toners that contain varying concentrations of fluorescent dyes, which can be added to the toner formulation or used as a surface coating, allowing for fluorescent effects on top of color-toned areas without altering the original colors, and optionally including metallic pigments for enhanced effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If CMYK toners are used for color printing, then the printing process can reproduce standard colors, but fluorescent colors cannot be reproduced as they fall outside the color gamut
Solution Approach 1:
The printing system is segmented into five independent printing stations, each handling specific color requirements. The first four stations (C, M, Y, K) handle standard colors, while the fifth station专门 handles fluorescent colors. This segmentation allows each station to be optimized for its specific function, enabling both standard and fluorescent color reproduction without interference.
Solution Approach 2:
The fifth printing station is designed with universal capability to print various fluorescent colors by using a single fluorescent toner formulation that can be selectively applied. This multi-functional approach allows the system to reproduce different fluorescent shades without requiring separate toner formulations for each color, thus achieving versatility while maintaining system simplicity.
2Manufacturing precision
If specific fluorescent toners are designed and manufactured for each fluorescent shade, then accurate fluorescent color reproduction is achieved, but the process becomes extremely time-consuming and costly
Solution Approach 1:
Instead of changing the toner formulation for each fluorescent shade, the system changes the printing parameters by selectively activating the fifth printing station with a single fluorescent toner formulation. The fluorescent color variation is achieved through digital control of which areas receive fluorescent toner and at what density, rather than through physical toner composition changes. This parameter-based approach maintains manufacturing precision while dramatically improving productivity.
3Reliability
If fluorescent pigments or dyes are incorporated in the toner, then fluorescent effects can be achieved, but the application is limited to available dyes and requires extensive toner redesign
Solution Approach 1:
The fluorescent dye component is extracted from the complex toner formulation and isolated to a dedicated fifth printing station. This allows the use of a standardized fluorescent toner formulation that can be applied independently of the CMYK color system. The extraction simplifies the overall system by separating fluorescent printing from standard color printing, reducing toner formulation complexity while maintaining reliable fluorescent effects.
4Adaptability or versatility
If clear fluorescent toner is printed on top of color toners, then fluorescent marks can be added without changing original colors, but additional printing infrastructure is required
Solution Approach 1:
The fluorescent toner printing is nested within the existing five-color printing system as a fifth layer. The clear fluorescent toner is applied on top of the CMYK printed areas, allowing fluorescent marks to be integrated into the existing color image without altering the original colors. This nesting approach enables versatile fluorescent mark integration while utilizing the existing printing infrastructure efficiently.
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 creation of prints with fluorescent marks and effects on any color or uncolored areas without changing the original colors, offering flexibility and cost-effectiveness in reproducing a wide range of fluorescent shades, suitable for security and advertisement purposes.
Implementation Method 1
a fifth station is equipped with substantially clear fluorescent toners that are printed on top of the color toners. The toners may contain various fluorescent dyes.
Data Source
AI summary
The invention describes a method providing prints with fluorescent effects on a document generated by color electrophotographic print processes, employing an electrophotographic printer equipped with five print modules, where four printing stations are equipped with black, yellow, magenta and cyan toners and a fifth station is equipped with substantially clear fluorescent toners to be printed on top of the color toners or directly on a substrate of the print document. In further developments of the present invention, the clear fluorescent toner absorbs light in the UV-A range or comprises metallic pigments or metallic effect pigments added to the clear fluorescent toner.