Metal Surface Texture Layout for Moiré Suppression and Paint Adhesion
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Solution Overview
Problem
Metal substrates with deterministic surface textures often suffer from moiré patterns when superposed, which negatively affect visual appearance, while stochastic textures may compromise paint properties, necessitating a surface texture that balances moiré suppression and paint functionality.
Innovation Solution
A metal substrate with a surface texture characterized by a Maximum Zero Normalised Auto Correlation (MZNAC) in the range of 0.2 - 0.8, achieved through pseudo-deterministic spatial distribution of features, is developed, combining good paint properties with suppressed moiré patterns by adjusting the positioning and characteristics of surface features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deterministic surface texture is applied to improve paint properties, then paint adherence is improved, but moiré patterns occur that negatively affect visual appearance
Solution Approach 1:
The invention changes the key parameter of surface texture from deterministic to pseudo-deterministic arrangement, controlled by the MZNAC parameter range of 0.2-0.8. This parameter change maintains sufficient structure for paint adherence while introducing enough randomness to suppress moiré pattern formation during superposition in rolling processes
Solution Approach 2:
The invention introduces asymmetry and controlled irregularity in the surface feature distribution through pseudo-deterministic arrangement. Instead of perfect periodicity, the surface features are positioned with controlled deviations from strict determinism, preventing the coherent superposition that causes moiré patterns while maintaining functional performance
2Object-affected harmful factors
If stochastic surface texture is applied to suppress moiré patterns, then visual appearance is improved, but paint properties are compromised
Solution Approach 1:
The invention optimizes the randomness parameter by defining MZNAC in the range of 0.2-0.8, which represents a middle ground between fully deterministic and fully stochastic arrangements. This controlled parameter range ensures sufficient surface structure for paint adherence while providing adequate randomness to suppress moiré patterns
Solution Approach 2:
The invention applies different degrees of determinism locally across the surface while maintaining overall pseudo-deterministic character. The surface features are arranged with controlled local variations that provide sufficient structure for paint properties in each local area while the global arrangement suppresses moiré patterns
Data Source
Figure 1(1)~1(6)
Figure 1(7)~1(11)
Figure 2
AI summary
The invention relates to a metal substrate provided with a surface texture characterised in that the Maximum Zero Normalised Auto Correlation (MZNAC) of the surface texture is in the range of 0.2 – 0.8, as well as a method to apply such surface textures on a metal substrate.