Decorative Molded Article Uneven Surface Brightness Control
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Solution Overview
Problem
The partially-matted transfer-molded articles exhibit non-uniform brightness and a whitish appearance due to uneven luminous reflectance, making them unattractive.
Innovation Solution
A decorative molded article with a protective layer having an uneven surface, where a transfer sheet with a complementary surface profile is used, ensuring a specific range of luminous reflectance and a controlled slope to achieve uniform brightness and prevent whitening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a transfer sheet with a matting agent and mask layer is used to create a partially-matted surface, then design decorativeness with different textures is improved, but brightness uniformity deteriorates and whitening occurs
Solution Approach 1:
The invention changes the surface geometry parameter by forming an uneven surface with specific slope control (−2.00 or more and −0.90 or less) instead of using chemical matting agents. This parameter change achieves the desired light diffusion effect while maintaining brightness uniformity and preventing whitening, thus resolving the contradiction between design decorativeness and brightness uniformity
Solution Approach 2:
The invention applies local quality by creating an uneven surface structure with controlled slope in specific regions where light reflection needs to be managed. This localized surface modification achieves texture and light control without affecting the entire surface uniformly, preventing the whitening effect while maintaining design decorativeness
2Shape
If an uneven surface is created on the transfer layer, then light diffusion is improved for texture effect, but brightness uniformity and appearance attractiveness deteriorate
Solution Approach 1:
The invention transforms the surface from a chemically-matted texture to a geometrically-controlled uneven surface with specific slope parameters (−2.00 or more and −0.90 or less). This parameter change maintains the texture effect while controlling light reflection to preserve brightness uniformity and visual attractiveness
Solution Approach 2:
The invention uses curved surface geometry (uneven surface with controlled slope) instead of flat or randomly-matted surfaces. The specific curvature control achieves desired light diffusion for texture effect while preventing excessive scattering that would cause brightness non-uniformity and whitening
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 results in a decorative molded article with uniform brightness and reduced surface diffusion, preventing whitening and enhancing design decorativeness.
Implementation Method 1
a visible light inclined by 10 degrees from the normal direction of the sample A is made to run into the uneven surface, and based on the specular direction of the incident light as a reference angle, a luminous reflectance is measured
Data Source
AI summary
Provided is a decorative molded article that uniformizes the brightness of an uneven surface and inhibits whitening. The decorative molded article is provided with a protective layer having an uneven surface on an adherend, and satisfying the following requirement 1-1: <Requirement 1-1> A black plate is stuck to the surface of the article on the adherend side thereof via a transparent pressure-sensitive adhesive layer to prepare a sample A. A visible light inclined by 10 degrees from the normal direction of the sample A is made to run into the uneven surface, and based on the specular direction of the incident light as a reference angle, a luminous reflectance is measured every 0.2 degrees within a range of the reference angle±5.0 degrees.