Recess Printed Motif Protecting Back-Side Security Features
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Solution Overview
Problem
Conventional two-sided intaglio printing limits the tactility of security features to the front side of documents, as the back side's relief elements are leveled during the high-pressure intaglio printing process, and glossy elements on the back lose their gloss due to contact with the impression cylinder or blanket.
Innovation Solution
Incorporating embossed elevations on the front side that protect the security features on the back side during intaglio printing, allowing for both tactile and glossy security features to be preserved and enhanced, with the elevations designed to have soft flanks and specific shapes to reduce damage and enhance tearing behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-pressure intaglio printing is applied to the front side, then the intaglio motif is successfully produced, but the relief elements on the back side are leveled and glossy elements lose their gloss
Solution Approach 1:
The printing plate is segmented into different zones: intaglio printing zones for the front side motif and recess zones for protecting back side security features. This segmentation allows simultaneous execution of high-pressure intaglio printing and protection of relief elements through spatial separation of functions.
Solution Approach 2:
The recesses in the printing plate act as intermediary protective structures that absorb and distribute the high printing pressure, preventing it from reaching and damaging the glossy and relief elements on the back side of the document.
2Reliability
If glossy elements are applied to the back side before intaglio printing, then security features are enhanced, but the elements lose gloss due to contact with the impression cylinder
Solution Approach 1:
The printing plate surface is divided into active intaglio printing areas and recessed protection areas. The recesses create a protective barrier that prevents the impression cylinder from contacting glossy elements on the back side, while still allowing ink transfer in the non-recessed areas.
Solution Approach 2:
The recesses are pre-formed in the printing plate to counteract the harmful effect of high-pressure contact before it occurs. This preliminary structural arrangement prevents gloss loss by eliminating direct contact between the impression cylinder and glossy security features.
3Reliability
If relief elements are created on the back side for tactile security, then authentication is improved, but they interfere with the intaglio printing process on the front side
Solution Approach 1:
The printing plate is functionally segmented into zones that correspond to front side motif areas and back side security feature areas. This spatial segmentation allows each zone to perform its specific function without interfering with the other during the high-pressure intaglio printing process.
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
This approach enables the preservation of tactile and glossy security features on both sides of the document, providing high-quality protection against counterfeiting and enhancing the authenticity of security papers and documents.
Implementation Method 1
In order to transfer as much of the color as possible from the engraved lines onto the paper during printing, very high forces are at work between the forme cylinder and the impression cylinder.
Implementation Method 2
due to the high pressure forces, the paper can also be pressed into the engraving of the printing plate in the ink-free areas and thus be provided with an embossed relief structure.
Implementation Method 3
the at least one elevation is advantageously designed to be extensive. It is preferably designed with a rounded outline, in particular as a circle, oval or any free form with rounded corners.
Data Source
Figure 1~3
Figure 4a~4e
Figure 5~6c
AI summary
The invention relates to a security element for security papers, documents of value and the like having a front side (16) and a rear side (18), a security feature (14) which is applied on the rear side (18) and a recess printed motif (12, 20) which is subsequently applied on the front side. According to the invention, the recessed printed motif comprises at least one embossed elevation (20E) which lies opposite the security feature (14) and protects at least one part region of the security feature (14) during the recess printing step.