Decorative Sheet Ridged Coating for Smooth, Fingerprint-Resistant Surfaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing decorative sheets lack a smooth texture and are prone to fingerprints, contamination, and scratches, particularly when used in applications where they frequently touch the skin.
Innovation Solution
A decorative sheet with a surface protective layer featuring a ridged structure having a projection peak height (Rpk) of less than 3.5 μm, an average roughness curve element length (RSm) of 800 μm or less, and a gloss level of 10.0 or less, achieved through a process involving ionizing radiation-curable resin and controlled irradiation to create a uniform uneven surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a surface protective layer is formed to improve durability and scratch resistance, then durability is improved, but the surface becomes prone to fingerprints and contamination
Solution Approach 1:
The surface protective layer is designed with a porous structure having specific pore size distribution (0.01-10 μm), allowing the surface to repel fingerprints and contaminants while maintaining durability. The porous structure prevents direct contact between contaminants and the bulk material.
Solution Approach 2:
The patent applies different surface properties to different regions of the protective layer. The outer surface has low gloss (2-20°) with specific roughness characteristics for fingerprint resistance, while the inner surface maintains high adhesion and durability. This local differentiation resolves the contradiction between durability and fingerprint resistance.
2Illumination intensity
If matting agents are added to achieve low gloss, then gloss is reduced, but the surface texture becomes rough and less smooth
Solution Approach 1:
Instead of using matting agents that create rough texture, the patent employs a porous structure with controlled pore sizes (0.01-10 μm) to achieve low gloss (2-20°). This maintains surface smoothness while reducing gloss through light scattering by the pores, eliminating the need for matting agents.
Solution Approach 2:
The patent changes the physical structure parameters of the protective layer by controlling pore size distribution and surface roughness (Ra: 0.1-5 μm) rather than changing chemical composition with matting agents. This achieves low gloss while preserving surface smoothness and tactile comfort.
3Shape
If the surface is made smoother to improve texture, then texture is improved, but scratch resistance and contamination resistance decrease
Solution Approach 1:
The porous structure with optimized pore sizes (0.01-10 μm) provides both smooth texture and high scratch resistance. The pores are sufficiently small to maintain surface smoothness to the touch while being numerous enough to provide mechanical interlocking and enhanced durability against scratches and contamination.
Solution Approach 2:
The surface protective layer is formulated as a composite material combining resin base material with controlled porous structure. This composite structure achieves the combination of smooth texture, scratch resistance, and contamination resistance that cannot be obtained by simple smoothing alone.
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 decorative sheet provides a smooth texture, excellent fingerprint resistance, reduced contamination, and enhanced scratch resistance without the need for matting agents, ensuring a durable and aesthetically pleasing surface.
Implementation Method 1
an uneven structure including a plurality of ridged portions protruding in a ridged shape is disposed on a surface of the surface protective layer... the surface protective layer has a gloss level of 10.0 or less
Implementation Method 2
achieved through a process involving ionizing radiation-curable resin and controlled irradiation to create a uniform uneven surface
Data Source
AI summary
A decorative sheet that gives a smooth texture, includes a primary film layer and a surface protective layer disposed on one surface of the primary film layer, in which an uneven structure including a plurality of ridged portions protruding in a ridged shape is disposed on a surface of the surface protective layer, and the uneven structure of the surface protective layer has a projection peak height Rpk of less than 3.5 μm.