Antifouling Matted Glassy Layer Surface Control
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Solution Overview
Problem
Existing methods for creating a matted surface with antifouling properties struggle to achieve a glossiness of 60° or less while maintaining high dirt removability, as dirt tends to accumulate in the recessed asperities and is difficult to remove.
Innovation Solution
A matted object with a glassy layer on a substrate, where the surface has a 60°-glossiness of 20 or less, a skewness Rsk of −0.5 or more, and a maximum height roughness Rz between 2.5 μm and 5.7 μm, achieved through sintering and wet blasting processes, allowing for effective dirt removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a matted surface is created with asperities to scatter light, then a matted exterior is achieved, but dirt enters the recessed portions and becomes difficult to remove
Solution Approach 1:
The invention changes the surface roughness parameters by controlling Rz to be less than 5.7 μm and Rsk to be −0.5 or more, transforming the surface profile from one with deep recesses to one with controlled asperities that scatter light while preventing dirt accumulation
Solution Approach 2:
The invention uses asymmetric surface profile control where positive skewness (Rsk ≥ −0.5) creates a distribution of asperities that are asymmetric in shape, providing both light scattering for matting and geometry that prevents dirt from becoming trapped in recessed areas
2Shape
If a matted surface with low glossiness (60°-glossiness of 20 or less) is achieved, then aesthetic appeal is improved, but antifouling property is compromised
Solution Approach 1:
The invention simultaneously controls multiple surface parameters (Rz < 5.7 μm, Rsk ≥ −0.5, and 60°-glossiness ≤ 20) to achieve a parameter combination that provides both low glossiness for aesthetic appeal and controlled surface geometry for antifouling properties
Solution Approach 2:
The invention creates a composite surface structure combining a glassy layer with controlled roughness characteristics, where the glassy matrix provides chemical inertness and the controlled asperity structure provides physical antifouling properties while maintaining mat appearance
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 provides a matted surface with a 60°-glossiness of 20 or less and high dirt removability, ensuring both aesthetic appeal and practical cleanliness.
Implementation Method 1
to obtain a matted surface, methods have been employed which involve providing a surface with asperities so that light will be scattered on the surface
Implementation Method 2
In this method, in the sintering process, alumina in the glaze is separated and small alumina crystals are deposited on the surface of the ceramic ware to mat the surface
Implementation Method 3
JP H06-191920 A describes a method of manufacturing a ceramic ware involving sintering the ceramic ware with its surface matted
Data Source
AI summary
An object of the present invention is to provide a matted object capable of achieving both a lower range of glossiness and an antifouling property. A matted object includes a substrate, and a glassy layer provided on the surface of the substrate. The surface of the glassy layer has a 60°-glossiness of 20 or less, a skewness Rsk of −0.5 or more, and a maximum height roughness Rz more than 2.5 μm and less than 5.7 μm, the skewness Rsk and the maximum height roughness Rz being specified in JIS B0601 (2001).