Decorative Sheet Surface Wrinkles for Low Gloss and Moist Feel
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Solution Overview
Problem
Existing decorative sheets lack a combination of low gloss and a moist feel, and often fail to provide adequate weather resistance and durability.
Innovation Solution
A decorative sheet design featuring a primary film layer with a surface protective layer having a specific uneven structure, characterized by a ratio Rdc/t between cut level difference and thickness, and an absorption spectrum ratio I1095/I1725, which includes a cured product of a resin and particles, providing a low gloss and a moist 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 aesthetic properties are improved, but scratch resistance and contamination resistance deteriorate
Solution Approach 1:
The invention changes the surface morphology parameters by controlling the formation of wrinkles with specific amplitude (0.5-5 μm) and wavelength (10-100 μm) through UV irradiation conditions, replacing the chemical approach of adding matting agents with a physical surface structure approach that maintains durability
Solution Approach 2:
The invention replaces the chemical mechanism (matting agents) with a physical mechanism (surface wrinkles formed by UV irradiation) to achieve low gloss, thereby avoiding the deterioration of scratch and contamination resistance caused by chemical additives
2Illumination intensity
If excimer light is used to form wrinkles for low gloss, then aesthetic properties are improved, but the moist feel is lost
Solution Approach 1:
The invention uses periodic UV irradiation to form a regular wrinkle pattern on the surface, creating a controlled uneven structure that provides both low gloss and a pleasant moist feel through the periodic undulations
Solution Approach 2:
The invention optimizes the wrinkle parameters (amplitude 0.5-5 μm, wavelength 10-100 μm) to achieve the right balance between gloss reduction and maintaining a smooth moist feel, avoiding excessive roughness that would eliminate the moist sensation
3Strength
If the surface protective layer thickness is increased to improve durability, then scratch resistance is improved, but gloss control and moist feel deteriorate
Solution Approach 1:
The invention applies local quality by creating surface wrinkles only on the outer surface of the protective layer while maintaining the layer's overall thickness for durability, so the bulk provides strength while the surface provides aesthetic properties
Solution Approach 2:
The invention addresses the contradiction by moving from a two-dimensional flat surface to a three-dimensional wrinkled surface, where the wrinkle amplitude and wavelength control gloss while the layer thickness maintains durability
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 appearance with a moist feel while maintaining durability and weather resistance, enhancing aesthetic and functional properties.
Implementation Method 1
irradiating a surface protective layer coating film with a main component of an ionizing radiation curable resin with light having a wavelength of 200 nm or less
Implementation Method 2
the coating film is irradiated with light having a wavelength of 200 nm or less, wrinkles are produced on a surface of the coating film
Data Source
AI summary
The disclosure provides a decorative sheet 1 including a primary film layer 2 and a surface protective layer 5 provided to one side of the primary film layer 2, wherein the surface protective layer 5 has a surface provided with an uneven structure including a plurality of ridge portions each protruding in a ridge-like shape; in the uneven structure of the surface protective layer 5, a ratio Rdc/t between a cut level difference Rdc and a thickness t of the surface protective layer 5 is 0.15 or more and 0.44 or less; the thickness t of the surface protective layer 5 is 2 μm or more and 18 μm or less; and an absorption spectrum obtained from Fourier infrared spectrometry of the surface protective layer 5 has a ratio I1095/I1725 of 0.65 or more.