Partially Cured Coated Sheets for Scratch-Resistant Decorative Panels
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Solution Overview
Problem
Existing decorative panels face issues such as clicking sounds, poor scratch resistance, unsharp relief, and health risks from photo-initiators in UV-cured acrylate resins, along with a plastic-like appearance and limited structural realism in PVC layers.
Innovation Solution
A partially cured coating layer with higher carbon-carbon double bonds at the surface and lower at the interface with the support layer, combined with a thermo-induced radical polymerization process, allows for precise structuring and excellent adhesion, achieving matt and gloss effects, and improved scratch resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV curing is used to finish panels with printed decor layer, then favorable surface properties are achieved, but the molecules used as photo-initiators pose health risks to humans
Solution Approach 1:
The patent removes photo-initiators from the coating composition entirely, replacing UV curing with thermal curing. This extraction of the harmful substance while maintaining the curing function resolves the contradiction between achieving favorable surface properties and eliminating health risks.
Solution Approach 2:
The patent changes the curing mechanism from UV-based to thermal-based, altering the fundamental parameter of how the coating is cured. This parameter change eliminates the need for photo-initiators while still achieving complete curing and favorable surface properties.
2Strength
If a PVC layer is applied to provide wear resistance, then comparable wear resistance to melamine is achieved, but the layer must be considerably thicker giving rise to a plastic-like appearance
Solution Approach 1:
The patent uses a composite coating system combining acrylate resin with inorganic fillers (alumina, silica) to achieve both wear resistance and aesthetic appearance. This composite approach provides the hardness needed for wear resistance while maintaining a thin profile that doesn't create a plastic-like appearance.
Solution Approach 2:
The patent applies different functional layers within the coating: the acrylate resin provides adhesion and flexibility, while the inorganic filler particles provide wear resistance. This local differentiation of properties allows the coating to be thin yet durable, avoiding the plastic-like appearance associated with thick uniform PVC layers.
3Strength
If melamine resin is used for the top layer, then scratch resistance is maintained, but clicking sounds occur during use
Solution Approach 1:
The patent changes the material composition from melamine resin to an acrylate-based system with inorganic fillers. This parameter change maintains scratch resistance through the filler particles while eliminating the clicking sounds characteristic of melamine laminate panels.
Solution Approach 2:
The patent replaces the traditional melamine resin system with an alternative coating system that achieves the same protective function without the harmful acoustic side effects. The acrylate-resin-with-fillers system provides equivalent or superior performance without generating clicking sounds.
4Stability of the object's composition
If the coating layer is fully cured at the surface, then non-tackiness is achieved, but adhesion to the support layer deteriorates
Solution Approach 1:
The patent creates a gradient in curing degree through the coating thickness: the surface is fully cured to eliminate tackiness, while the region near the support layer remains less cured to maintain adhesion. This local differentiation of curing state resolves the contradiction between non-tackiness and adhesion.
Solution Approach 2:
The patent applies partial UV curing followed by complete thermal curing. The initial partial UV cure provides surface non-tackiness, while the subsequent thermal cure completes the curing process throughout the entire coating thickness, ensuring both surface properties and adhesion are optimized.
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 solution enables precise copying of complex structures, maintains adhesion, and provides excellent matt and gloss effects while ensuring non-tackiness and stability for long-term storage, with improved scratch resistance and suitability for outdoor use.
Implementation Method 1
The coating layer is partially cured by means of UV-radiation
Implementation Method 2
The method comprises the step of providing a support layer, applying a coating on the support layer, and partially curing the coating by means of UV-radiation
Data Source
AI summary
A sheet includes a support layer and a coating layer on a side of the support layer. The coating layer is partially cured. The coating layer has carbon-carbon double bonds. The relative amount of carbon-carbon double bonds is higher at the surface of the coating layer than at the contact surface of the coating layer with the support layer. Methods are disclosed to manufacture such sheets; and to produce a decorative panel using such sheets.