Low-Gloss Decorative Sheet with Controlled Surface Free Energy
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Solution Overview
Problem
Current decorative sheets face challenges in easy cleanability due to high wiping resistance and difficulty in removing strongly adhering grime, especially gypsum powder, which affects their designability and cleanliness, particularly on floors.
Innovation Solution
A decorative sheet with a thermoplastic resin base material and a surface-protecting layer having a specific surface free energy, arithmetic average roughness, and specular glossiness, incorporating hydrophobic inorganic fillers, is designed to reduce wiping resistance and enhance cleanability while maintaining low-gloss designability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If surface irregularities are increased to prevent contaminant adhesion, then easy cleanability is improved, but gloss on the surface is reduced and designability is compromised
Solution Approach 1:
The patent applies parameter changes by precisely controlling the surface free energy (40-70 mJ/m²) and surface roughness (Ra 0.2-0.8 μm) to achieve optimal balance between cleanability and gloss. By adjusting these physical parameters within specific ranges, the invention resolves the contradiction between preventing contaminant adhesion and maintaining surface aesthetic quality.
Solution Approach 2:
The invention uses composite materials by combining thermoplastic resin base material with a surface-protecting layer containing inorganic fillers (such as silica or titanium oxide). This composite structure allows the surface layer to provide both the desired surface properties for easy cleaning and the optical properties for maintaining gloss and designability.
2Shape
If surface irregularities are reduced to maintain gloss, then designability is improved, but wiping resistance increases and cleanability deteriorates
Solution Approach 1:
The patent resolves this contradiction by optimizing surface free energy to 40-70 mJ/m² and surface roughness (Ra) to 0.2-0.8 μm. These parameter changes ensure that the surface maintains sufficient gloss for designability while having appropriate wetting properties that reduce wiping resistance and facilitate easy cleaning of adhered contaminants.
3Ease of operation
If surface free energy is increased to reduce contaminant adhesion, then easy cleanability is improved, but surface properties may be compromised
Solution Approach 1:
The patent applies parameter changes by setting surface free energy within the specific range of 40-70 mJ/m². This optimized parameter range ensures that the surface has sufficient energy to prevent strong contaminant adhesion while maintaining stable surface properties that do not compromise the integrity or performance of the decorative sheet.
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 effectively allows easy removal of strongly adhering grime with low wiping resistance, ensuring excellent cleanability and designability, making it suitable for floor applications.
Implementation Method 1
the surface-protecting layer has a surface free energy of 40 mJ/m2 or more
Data Source
AI summary
The present invention provides a low-gloss decorative sheet having an appropriately low level of wiping resistance, and thereby enables strongly adhering grime to be easily wiped off, thus being excellent in terms of easy cleanability. The present invention provides a decorative sheet comprising a base material sheet and at least a surface-protecting layer on the base material sheet,(1) the base material sheet being a thermoplastic resin sheet,(2) the surface-protecting layer having a surface free energy of 40 mJ/m2 or more,(3) an arithmetic average roughness (Ra0.08) measured on the surface side of the surface-protecting layer at a cutoff value of 0.08 mm with an evaluation length of 0.4 mm by a measurement method in accordance with JIS B0601:2001 being 0.60 μm or less, and(4) a specular glossiness on the surface-protecting layer side of the decorative sheet at an incident angle of 60° being 23 or less.