Multilayer Body Mask Structuring for High-Resolution Printing
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Solution Overview
Problem
Conventional printing methods struggle to produce reproducible, high-resolution multicolored fine line patterns with precise register accuracy, especially when creating color gradients or true-color images, due to limitations in register accuracy and edge sharpness, making it difficult to achieve secure and authentic security documents.
Innovation Solution
A method involving a multi-layer body production process where a first printed layer is structured using a second printed layer as a mask, with the second layer serving as a protective layer, allowing for precise removal of the first layer in uncovered areas, resulting in finely structured, multicolored line patterns with sharp edges and accurate register.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional printing processes are used to print multicolored fine line patterns, then the printing process is simple, but the register accuracy and edge sharpness are insufficient
Solution Approach 1:
The printing process is divided into two separate steps: first printing the colored layer over the entire area, then printing the fine line pattern layer in monochrome. This segmentation allows each layer to be optimized independently - the first layer provides color without requiring high precision, while the second layer provides the fine structural details with high register accuracy.
Solution Approach 2:
The first printed layer acts as an intermediary that provides the color background, while the second printed layer serves as a mask that defines the final fine line pattern. This intermediary approach allows the color information and structural information to be separated and then combined with high precision.
2Manufacturing precision
If iris printing is used to create color gradients, then multicolored patterns can be produced, but the exact course of the gradient cannot be controlled and reproduction is difficult
Solution Approach 1:
The color gradient is pre-established in the first printed layer before the fine line pattern is applied. By printing the colored layer first with the desired gradient already in place, the gradient control is achieved in a separate step that does not require high precision, making the process reproducible.
3Manufacturing precision
If fine screened motifs are printed, then high resolution patterns can be produced, but they dry very quickly on the gravure roller and are difficult to print
Solution Approach 1:
The printing of fine screened motifs is separated from the color application. The fine lines are printed as a separate monochrome layer that does not require the same drying time constraints as multicolored printing, allowing high resolution to be achieved without sacrificing productivity.
4Manufacturing precision
If multicolored fine lines are printed directly, then the desired color pattern is achieved, but register accuracy and edge sharpness are insufficient
Solution Approach 1:
The multicolored fine line pattern is segmented into two functional layers: a colored layer that provides the color information and a pattern layer that provides the fine line structure. This segmentation enables edge sharpness and register accuracy to be achieved by the pattern layer while the colored layer handles the color information.
Solution Approach 2:
The colored layer serves as an intermediary that is subsequently removed in the areas not covered by the fine line pattern, allowing the fine line structure to emerge with sharp edges and accurate registration.
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 high-resolution, multicolored fine line patterns with precise register accuracy, enhancing security features in documents like banknotes and identification papers, and allowing for reproducible and secure printing of complex designs.
Implementation Method 1
the first lacquer, which enters into a cross-linking reaction with a second lacquer used to apply the second printed layer
Implementation Method 2
The first printed layer is preferably an alkali-soluble lacquer... This enables the desired structuring of the first printed layer using the second printed layer as a mask
Data Source
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AI summary
The invention relates to a method for producing a multilayer element, comprising the steps of: a) providing a first printed layer; b) partially applying a second printed layer onto the first printed layer; c) structuring the first printed layer using the second printed layer as a mask. The invention further relates to a multilayer element obtainable by said method as well as to a security document comprising a multilayer element of said type.