Decorative Sheet Surface Structure for Natural Tactile Texture
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Solution Overview
Problem
Existing decorative sheets fail to adequately reproduce the tactile sensation of natural materials like wood grain, with previous technologies only providing insufficient tactile feedback from uneven surfaces or protruding portions.
Innovation Solution
A decorative sheet design featuring a substrate with a surface protective layer comprising distinct first and second regions, where the first region has a maximum height of 25 μm or more, skewness greater than 0, and kurtosis of 10.0 or more, and the second region has a maximum height of 18 μm or more and skewness greater than 0, along with specific binder resins and particles, creating a complex tactile sensation by varying the height and sharpness of protruding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If an uneven surface is formed by embossing to impart tactile sensation, then tactile sensation is improved, but the tactile sensation cannot sufficiently reproduce the tactile sensation of natural objects such as wood grain
Solution Approach 1:
The patent applies local quality by creating distinct surface regions with different tactile characteristics. The surface protective layer is divided into first and second regions, where the first region has a maximum height Rz of 25 μm or more and kurtosis Sku of 10.0 or more to provide strong tactile sensation, while the second region has a maximum height Rz of 18 μm or more and kurtosis Sku of 4.0 or more to provide milder tactile sensation. This localized variation in surface properties enables the decorative sheet to reproduce the tactile sensation of natural objects like wood grain more accurately.
2Ease of operation
If protruding portions are added to the surface to impart tactile sensation, then tactile sensation is improved, but sufficient tactile sensation is obtained just from the protruding portions, preventing reproduction of natural object textures
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface morphology parameters (maximum height Rz and kurtosis Sku) of the surface protective layer. By adjusting these parameters to specific ranges in different regions, the patent creates a balanced tactile sensation that combines the benefits of protruding portions with the natural texture reproduction, avoiding over-reliance on any single surface feature.
Data Source
AI summary
A decorative sheet includes a substrate, a surface protective layer that covers the substrate, and raised portions situated between the substrate and the surface protective layer. The raised portions face first regions of the surface protective layer. The raised portions include a first binder resin, and first particles of which an average particle size is 10 μm or more. The surface protective layer includes a second binder resin, and second particles of which an average particle size is 10 μm or more and 20 μm or less. An average thickness of the raised portions is 20 μm or more. An average thickness of the surface protective layer is 3 μm or more and 15 μm or less.