Anti-fingerprint Coating for Appliance External Walls
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Solution Overview
Problem
Conventional metal surfaces on household appliances are costly and difficult to clean due to their susceptibility to fingerprints and other marks, requiring frequent and careful maintenance.
Innovation Solution
A two-layer coating system is applied to the substrate of household appliance external walls, using materials like stainless steel with titanium or chrome as the first layer and titanium aluminum nitride or diamond-like-carbon as the second layer, providing high wear resistance and ease of cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional metal surfaces are used for external walls, then the housing provides structural strength and aesthetic appearance, but the surface requires frequent and careful cleaning to remove fingerprints and traces of use
Solution Approach 1:
The patent applies a composite coating structure consisting of multiple layers (e.g., PVD coating, CPLP coating, or specific material combinations like titanium/chrome with titanium aluminum nitride/diamond-like-carbon) on the metal substrate. This composite structure combines the structural strength of metal with the anti-fingerprint and easy-clean properties of the coating layers, resolving the contradiction between maintaining metal aesthetics and reducing cleaning requirements.
Solution Approach 2:
The patent modifies the surface properties of the metal by applying coatings with specific physical and chemical parameters (hardness, surface energy, porosity) that inherently resist fingerprint adhesion and facilitate easy cleaning. The coating materials and their thickness parameters are optimized to provide both durability and anti-soiling properties.
2Reliability
If conventional metal surfaces are used for external walls, then the housing maintains structural integrity, but the surface shows visible traces of use requiring frequent cleaning
Solution Approach 1:
The multi-layer coating system combines materials with complementary properties: the first layer (e.g., titanium or chrome) provides corrosion resistance and adhesion, while the second layer (e.g., titanium aluminum nitride or diamond-like-carbon) provides hardness, wear resistance, and anti-fingerprint properties. This composite structure simultaneously improves reliability and dirt resistance.
Solution Approach 2:
The coating is applied in advance to the metal substrate to create a pre-protected surface that inherently resists fingerprint adhesion and dirt accumulation. This preliminary protective action prevents the metal surface from showing traces of use, thereby extending the appearance service life without requiring frequent cleaning.
3Ease of operation
If a coating is applied to improve ease of cleaning, then the surface becomes resistant to dirt and easier to maintain, but the manufacturing process becomes more complex
Solution Approach 1:
The coating system is segmented into multiple functional layers, each with a specific thickness and material composition optimized for particular functions (adhesion, corrosion resistance, hardness, anti-fingerprint). This segmentation allows each layer to be tailored for its specific purpose while maintaining overall manufacturing feasibility through standardized deposition processes.
Solution Approach 2:
The patent specifies precise parameter ranges for the coating (total thickness 1-5 μm, individual layer thicknesses, material compositions) that balance the ease of cleaning benefit with manufacturing complexity. These optimized parameters ensure that the coating provides the desired anti-fingerprint properties while remaining compatible with existing PVD and CPLP deposition technologies.
Data Source
Figure 1
Figure 2~4
AI summary
The present invention relates to an external wall (1), particularly for a housing of a home appliance, comprising a substrate (2), a first layer (3) arranged on the substrate (2), and a second layer (4) arranged on the first layer (3). The material of the substrate (3) comprises or is stainless steel. According to the invention, the material of the first layer (2) comprises or is titanium (Ti), and the material of the second layer (4) comprises or is titanium aluminum nitride (AITiN). Alternatively, according to the invention, the material of the first layer (3) comprises or is chrome (Cr) and the material of the second layer (4) comprises or is diamond-like-carbon (DLC).