Metallic Laminate Coating for Uniform Chroma and Lightness
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Solution Overview
Problem
Existing coatings fail to maintain high chroma and lightness uniformly across the highlight and bottom regions, leading to a less vibrant and attractive appearance.
Innovation Solution
A laminate comprising a metallic base layer and a transparent colored layer, where specific chroma and lightness indices (X and Y) are maintained within certain ranges, along with a low graininess value, to ensure high lightness and chroma across the highlight and bottom regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multilayer coating film is formed with metallic base paint and clear colored paint to achieve high chroma and darkness, then the color depth and metal feeling are improved, but the lightness in the highlight region decreases and chroma uniformity across the surface is compromised
Solution Approach 1:
The invention segments the coating into three distinct layers: a metallic base layer containing aluminum pigment for light reflection, a transparent colored layer for color saturation, and an intermediate layer controlling the optical transition. This segmentation allows each layer to independently contribute to chroma and lightness properties, resolving the contradiction between highlight lightness and overall chroma uniformity.
Solution Approach 2:
The invention applies local quality by giving each layer specific optical properties: the metallic base layer provides high reflectivity for highlight lightness, the transparent colored layer provides high absorption for chroma, and the intermediate layer provides controlled transition. This localized optimization of optical properties in different regions of the coating structure enables simultaneous achievement of highlight lightness and uniform chroma across the surface.
2Illumination intensity
If the IV value of the coating film is increased to enhance luster, then the metal feeling is improved, but the chroma and lightness distribution across different viewing angles becomes uneven
Solution Approach 1:
The invention uses composite materials by combining metallic aluminum pigment with transparent colored resin in a multi-layer structure. The metallic base layer uses aluminum pigment flake with specific aspect ratios and surface treatments to achieve consistent luster across viewing angles, while the transparent colored layer maintains chroma saturation. This composite approach allows independent optimization of luster and chroma consistency that cannot be achieved with single-material coatings.
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 laminate achieves a vivid and bright appearance with excellent attractiveness by maintaining high lightness and chroma uniformly across the highlight and bottom regions, while minimizing graininess.
Implementation Method 1
a metallic base layer and a transparent colored layer formed on the metallic base layer... light illuminated at an incident angle of 45 degrees with respect to the laminate and received at respective angles
Implementation Method 2
transparent colored layer... chroma calculated from spectral reflectances... high chroma over a wide range from the highlight to the bottom
Data Source
AI summary
A laminate containing a metallic base layer and a transparent colored layer formed on the metallic base layer, wherein, whenX=[(C*45)2+(C*75)2)]1/2, andY=[(L*15)2+(C*15)2)]1/2+[(L*25)2+(C*25)2)]1/2,X is 64 or more, and Y is 191 or more; and the measured value of graininess (HG value) is 45 or less,with the proviso that C*15, C*25, C*45, and C*75 represent chroma calculated from spectral reflectances of light illuminated at an incident angle of 45 degrees with respect to the laminate and received at respective angles of 15 degrees, 25 degrees, 45 degrees, and 75 degrees deviated from the specular reflection light, and that L*15 and L*25 represent lightness calculated from spectral reflectances of light illuminated at an incident angle of 45 degrees with respect to the laminate and received at respective angles of 15 degrees and 25 degrees deviated from the specular reflection light.