Decorative Sheet Protective Layer for Low Gloss and Soft Feel
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Solution Overview
Problem
Existing decorative sheets lack a combination of low gloss and a soft, supple feel, and often require matting agents to achieve low gloss, which can compromise durability and tactile experience.
Innovation Solution
A decorative sheet design featuring a surface protective layer with asperities and a specific power ratio in its Fourier-transformed power spectrum, combined with a cured resin and particles, provides a low gloss and a soft, supple feel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a matting agent is added to the surface protective layer to achieve low gloss, then the gloss is reduced, but the durability and tactile experience are compromised
Solution Approach 1:
The invention changes the surface morphology parameters by controlling the formation of asperities with specific spatial frequency characteristics (power ratio x between 4.0-13.5 in the 500-1000 cycles/mm to 3000-3500 cycles/mm range). This physical structure modification achieves low gloss without adding matting agents, thereby maintaining the chemical composition and durability of the surface protective layer.
Solution Approach 2:
The surface protective layer is designed as a composite structure containing both the cured resin matrix and dispersed particles. This composite structure enables the formation of asperities that provide low gloss while the resin matrix maintains durability, avoiding the need for matting agents that would compromise material performance.
2Illumination intensity
If a matting agent is added to achieve low gloss, then the gloss is reduced, but the tactile experience becomes less soft and supple
Solution Approach 1:
The invention modifies the surface profile parameters by creating asperities with specific spatial frequency distribution (power ratio x between 4.0-13.5). This controlled surface morphology achieves low gloss while maintaining a soft and supple tactile feel, as the asperity structure can be optimized to provide both optical and tactile performance.
3Ease of operation
If the surface protective layer is made smoother to improve tactile feel, then the tactile experience improves, but the gloss increases beyond low gloss requirements
Solution Approach 1:
The invention independently controls surface parameters by creating asperities with specific spatial frequency characteristics. The power ratio x parameter allows decoupling of optical properties (gloss) from tactile properties, enabling the surface to have both low gloss and soft tactile feel simultaneously through precise control of asperity geometry and distribution.
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 achieves a low gloss of less than 10 with a soft and supple tactile experience, enhancing aesthetic and durability properties while maintaining processability and scratch resistance.
Implementation Method 1
the surface protective layer contains a cured resin and particles, and the surface protective layer contains 3 parts by mass or more and 13 parts by mass or less of the particles, relative to 100 parts by mass of the resin
Implementation Method 2
the resin is an ionizing radiation curable resin
Data Source
Figure 1
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AI summary
A decorative sheet (1) includes: a primary film layer (2); and a surface protective layer (5) provided on one surface of the primary film layer (2). A surface of the surface protective layer (5) has asperities including a plurality of ridge portions each protruding in a ridge-like shape, in a power spectrum obtained by Fourier transforming a surface profile of a cross section of the surface protective layer (5), a power ratio x of the mean of the common logarithm of power within a spatial frequency range of 500 cycles/mm or more and 1000 cycles/mm or less, log Pf500-1000, to the mean of the common logarithm of power within a spatial frequency range of 3000 cycles/mm or more and 3500 cycles/mm or less, log Pf3000-3500, is within a range of 4.0 to 13.5, and the surface protective layer (5) has a gloss of less than 10.