Tamper-Proof License Plate Stamping Film with Diffractive Relief
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Solution Overview
Problem
Current motor vehicle license plates are vulnerable to forgery, and existing tamper-proof solutions do not adequately enhance security while maintaining readability and durability.
Innovation Solution
A stamping film with a transparent release layer, opaque decoration layer, transparent protection layer, optically variable layer, reflection layer, and adhesive layer, featuring areal interruptions and a diffractive relief structure, which provides enhanced tamperproofness and optical effects without compromising recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a transparent protection lacquer layer and decoration lacquer layer with UV luminescent pigments are applied to the license plate, then the tamper-proofness and security are improved, but the manufacturing complexity and cost increase due to requiring printing processes and multiple lacquer layers
Solution Approach 1:
The stamping film is divided into multiple functional layers: a transparent protection lacquer layer for durability, a decoration lacquer layer with UV luminescent pigments for security marking, and an adhesive layer for fixation. This segmentation allows each layer to perform its specific function while simplifying the overall manufacturing process by applying all layers in a single stamping operation rather than multiple separate steps
Solution Approach 2:
The protection lacquer layer and decoration lacquer layer are pre-applied to the stamping film before the actual stamping process. This preliminary action ensures that the security features and protective coating are already in place on the film, eliminating the need for separate printing and lacquering steps during license plate production, thereby reducing manufacturing complexity
2Duration of action of stationary object
If HALS stabilizers and UV absorber additives are incorporated into the lacquer layers, then the durability and resistance to weathering are improved, but the manufacturing process becomes more complex requiring precise control of additive concentrations
Solution Approach 1:
The patent specifies precise parameter ranges for UV absorber and HALS stabilizer additives in the lacquer layers, optimizing their concentration to achieve maximum durability and weathering resistance. By defining specific parameter ranges rather than requiring complex real-time adjustments, the manufacturing process becomes more controllable and less complex while still achieving superior durability results
3Reliability
If a decoration lacquer layer with UV luminescent pigments is applied in a printing process, then the security features are enhanced, but the production time and manufacturing cost increase
Solution Approach 1:
The protection lacquer layer, decoration lacquer layer with UV luminescent pigments, and adhesive layer are combined into a single integrated stamping film structure. This merging allows all security features and protective coatings to be applied in one stamping operation rather than through separate printing and lacquering processes, significantly reducing production time while maintaining enhanced security features
Solution Approach 2:
The security features and decorative patterns are pre-formed on the stamping film through manufacturing processes that create precise patterns. During the stamping operation, these pre-formed patterns are transferred to the license plate in a single step, eliminating the need for time-consuming printing processes and thereby increasing production speed while maintaining security
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
The solution significantly improves the tamperproofness of motor vehicle license plates by incorporating a diffractive relief structure and areal interruptions, maintaining readability and durability under various lighting conditions while providing a secure, visually recognizable security feature.
Implementation Method 1
The optically variable layer (22) has a diffractive relief structure
Implementation Method 2
a reflection layer (24)
Data Source
AI summary
The invention concerns a stamping film for the production of tamper-proof license plates and a license plate produced using a stamping film. The stamping film includes a carrier film and a transfer layer which is detachable from the carrier film and which can be fixed on a substrate of the license plate. Starting from the carrier film, the transfer layer includes a transparent release layer, an opaque decoration layer, a transparent protection layer, an optically variable layer, a reflection layer, a colored layer and an adhesive layer. The decoration layer has mutually spaced areal interruptions where the transparent protection layer adjoins the release layer. The adhesive layer is provided for fixing the transfer layer to the substrate of the license plate.