Embossing Plate Recessed Structures for Security Documents
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Solution Overview
Problem
Existing methods for producing security documents with three-dimensional embossing fail to incorporate such structures into highly polished surfaces without damaging them, and there is a lack of solutions for using embossing plates in hot-cold-laminating presses.
Innovation Solution
A three-dimensional embossing plate for hot-cold-laminating presses is created with a highly polished surface, where recessed and raised structures are incorporated using multiple processing steps, including photo masking, chemical, and galvanic processes, allowing for the production of complex lens-like and diffractive structures without damaging the surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple repeats are used to produce three-dimensional embossing structures, then the embossing plate can be produced, but the production process becomes complex and time-consuming
Solution Approach 1:
The production process is divided into two independent stages: first producing the embossing plate with recessed structures, then producing a separate stamp with raised structures. This segmentation allows each stage to be optimized independently and simplifies the overall production process compared to traditional multiple repeats.
Solution Approach 2:
The embossing plate with recessed structures is produced in advance as a preliminary component. This preliminary plate serves as the basis for creating the final stamped document, eliminating the need for complex multiple repeat processes and reducing production time.
2Reliability
If security profiles are embossed into the document surface, then security features are created, but the surface quality is compromised
Solution Approach 1:
Instead of embossing raised security profiles directly onto the document surface (which compromises surface quality), the invention inverts the approach by using recessed structures in the embossing plate to create corresponding recessed security features. This inversion allows the surface to remain highly polished while still providing security through the recessed profile.
Solution Approach 2:
The recessed embossing plate acts as an intermediary tool that transfers security features without direct contact with the document surface. The plate's recessed structures create the security profiles through pressure transfer, allowing the document surface to remain smooth and high-quality while still obtaining security features.
3Reliability
If complex three-dimensional structures are incorporated into the embossing plate, then security is enhanced, but the risk of damaging the polished surface increases
Solution Approach 1:
The invention inverts the traditional approach by using recessed structures instead of raised structures in the embossing plate. This inversion ensures that the polished surface of the plate remains intact and undamaged, while still providing complex security features through the recessed three-dimensional structures.
Solution Approach 2:
The invention converts the potential harm of complex structuring (which could damage the surface) into a benefit by using recessed structures. The recessed design allows complex three-dimensional security features to be incorporated without compromising the polished surface quality, turning a potential problem into a solution.
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 method enables the economical production of embossed security documents like identity cards and passports with intricate three-dimensional structures, enhancing security features while maintaining the integrity of the polished surface.
Implementation Method 1
Information is input here by a laser beam to generate a hologram that will present different visual information at two different angles of view
Implementation Method 2
the first step generates recessed structures through photo masking and chemical or galvanic processes
Implementation Method 3
the first step generates recessed structures through photo masking and chemical or galvanic processes
Implementation Method 4
the first step generates recessed structures through photo masking and chemical or galvanic processes
Implementation Method 5
the second step adds raised microstructures using laser treatment or additional photo masking
Implementation Method 6
the second step adds raised microstructures using laser treatment or additional photo masking
Implementation Method 7
by means of thermal transfer press lamination
Implementation Method 8
by means of thermal transfer press lamination
Data Source
AI summary
The invention concerns an embossing plate for a hot-cold-laminating press with a three-dimensional structure based on an essentially flawless metal plate with a hardened surface of appropriate thickness and dimensions and a suitable surface, specifically a highly polished surface, into which or onto which the three-dimensional structure is incorporated by a process with at least two steps.An embossing plate produced by this process is used for the production of documents, specifically security documents, such as personal identity cards, passports, identification cards, credit cards, customer cards, driving licenses and similar sheet and/or card and/or book-like documents by means of hot-cold-lamination and/or embossing and/or item-by-item embossing.