Security Marker Layer Congruence via Segmented Coating
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Solution Overview
Problem
Existing security features fail to produce clear, sharply defined images in transmitted light with distinct partial optical features on both the front and back, which are interrupted by gaps, lacking precision in layer application and adhesion.
Innovation Solution
A method involving a flexible plastic carrier substrate with a structured lacquer layer, followed by sequential application and processing of metal and metal oxide layers using plasma or flame treatment, and solvent-based material application, ensuring precise demarcation and adhesion for creating security features with contrasting colors and luminescence effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional layer application methods are used for security features, then the production process is simpler, but the manufacturing precision and contour congruence of the layers deteriorate
Solution Approach 1:
The production process is divided into distinct sequential steps: applying first coating material, applying second coating material, then removing third coating material. This segmentation allows each layer to be applied and processed independently, ensuring precise contour alignment without requiring complex simultaneous multi-layer application equipment.
Solution Approach 2:
The third coating material is applied in advance as a mask layer before applying the second coating material. This preliminary action creates a predefined pattern that guides the subsequent layer application, ensuring that the second coating material is deposited only in the desired areas with precise contour congruence to the first coating material.
2Manufacturing precision
If multiple coating materials are applied simultaneously, then the production time is reduced, but the precision of material application and adhesion deteriorates
Solution Approach 1:
The coating application process is segmented into sequential single-layer applications rather than simultaneous multi-layer application. Each coating material is applied, processed, and stabilized independently, ensuring high material application precision and adhesion while maintaining reasonable production throughput through efficient sequential processing.
Solution Approach 2:
The third coating material serves as an intermediary mask layer that controls the deposition pattern of the second coating material. This intermediary layer enables precise material application by acting as a template, while the sequential process maintains productivity through efficient removal of the mask after use.
3Strength
If conventional adhesion methods are used, then the process is simpler, but the adhesion strength between layers deteriorates
Solution Approach 1:
The adhesion properties are enhanced by changing the chemical parameters of the coating materials through plasma treatment. The plasma process modifies the surface energy and chemical composition of the substrate and coating layers, creating strong chemical bonds between layers without requiring additional adhesion promoter layers or complex bonding equipment.
Solution Approach 2:
Plasma treatment acts as a strong oxidizing process that cleans and activates the coating material surfaces, creating reactive groups that enhance adhesion strength. This accelerated oxidation process improves interlayer bonding without adding mechanical complexity to the production system.
4Adaptability or versatility
If the carrier substrate is made thinner for better flexibility, then the adaptability improves, but the structural stability deteriorates
Solution Approach 1:
The carrier substrate is constructed as a composite structure combining multiple materials with complementary properties. This composite design provides the necessary flexibility for adaptability while maintaining structural stability through the synergistic combination of material properties, allowing the substrate to be thin yet sufficiently stable for security feature applications.
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 method achieves 100% congruent contours and precise color differentiation on both sides, enhancing security features' visibility and authenticity in documents and packaging materials.
Implementation Method 1
this layer is optionally treated by means of an inline plasma, corona or flame process
Implementation Method 2
this layer is optionally treated by means of an inline plasma, corona or flame process
Implementation Method 3
the material application is removed simultaneously with the layers located in the area of the material application by means of a solvent
Data Source
Figure 1~3
AI summary
The marker has a carrier substrate (1) deposited on two partial layers (3, 4), where the layers have different colors or color impressions and include partial transparent recesses. The layers are absolutely identical to each other applied without tolerances. The layers have different thicknesses and stoichiometries, where the marker includes diffractive layers, liquid crystal layers, colored layers and luminescent layers with electrically conductive and magnetic characteristics. The layers are made of aluminum, copper, silver, iron, gold, chromium, nickel, zinc, cadmium, bismuth, tin, titanium dioxide, chromium oxides, zinc sulfide, indium tin oxide, bismuth-oxide, antimony tin oxide, fluorinated tin oxide, zinc oxide, aluminum oxide, non-stoichiometric aluminum oxide, zinc chromate, iron oxides, copper oxides, non-stoichiometric copper oxide, silver oxides, copper-aluminum alloys, copper-zinc alloys, iron alloys, steel, malachite or Azurite. An independent claim is also included for a method for preparing a safety marker.