Reflective Ink Layer Structure for Metallic Color Without Metal
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Solution Overview
Problem
Existing methods for achieving a metallic visual appearance on substrates are costly due to the high expense of metal materials and time-consuming processes, and they limit the range of colors that can be made to appear metallic.
Innovation Solution
A substrate with a high reflectance ink layer and a substantially opaque ink layer, where the high reflectance ink enhances the reflectivity of visible light, making the opaque ink appear more colorful and metallic without using metallic components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If metal substrate or metal-containing ink layer is used to provide metallic appearance, then the metallic visual appearance is achieved, but the cost increases and the process becomes time-consuming
Solution Approach 1:
The patent creates an optical copy of metallic appearance using a multi-layer ink system that mimics the light reflection properties of metal surfaces. The high reflectance ink layer (≥40% reflectance) combined with the opaque ink layer reproduces the visual characteristics of metal without using actual metal materials, thereby achieving the metallic appearance at lower cost and with simpler processing.
Solution Approach 2:
The invention uses a composite ink system consisting of two distinct layers: a high reflectance ink layer and an opaque ink layer. This composite structure combines the light-reflecting properties of the first layer with the color-providing properties of the second layer, creating a material system that achieves metallic appearance characteristics without relying on expensive metal substrates or metal-containing inks.
2Illumination intensity
If metal is used to impart metallic visual appearance, then the metallic look is achieved, but the range of colors is limited
Solution Approach 1:
The patent applies different functional properties to different layers: the high reflectance ink layer provides the metallic shine and light reflection, while the opaque ink layer provides the color. This separation of functions allows independent optimization of each property, enabling a wide range of colors to be achieved while maintaining the metallic visual appearance through the reflective layer.
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 achieves a metallic appearance with enhanced reflectivity and color vibrancy, reducing costs and expanding color options compared to traditional metal-based methods.
Implementation Method 1
the first layer of high reflectance ink enhances the reflectivity of visible light initially incident through the substrate back through the substrate
Implementation Method 2
exhibiting an ink index of refraction that is greater than the substrate index of refraction
Data Source
AI summary
An article including: (a) a substrate (i) including a first primary surface and a second primary surface facing generally away from the first primary surface and (ii) exhibiting a substrate index of refraction; (b) a first layer of a high reflectance ink (i) layered over the second primary surface of the substrate, and (ii) exhibiting an ink index of refraction that is greater than the substrate index of refraction; and (c) a second layer of a substantially opaque ink, the second layer layered over the first layer, with the first layer sandwiched between the second layer and the substrate. The first layer is substantially free of a metallic component. For electromagnetic radiation throughout an entirety of the visible spectrum initially transmitted through the first primary surface of the substrate and incident on the first layer, the article exhibits an average reflectance that is greater than or equal to 4%.