Decorative Sheet Manufacturing Using Isocyanate-Polyol Resin
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Solution Overview
Problem
Existing decorative panel manufacturing processes using melamine-based impregnation resins face issues such as high energy consumption, formaldehyde emissions, visibility of fingerprints, color intensity loss, cold touch, susceptibility to degradation, and poor acoustic characteristics.
Innovation Solution
A method involving a carrier sheet impregnated with a non-melamine-based curable impregnation resin, followed by a curable coating on top, which is partially cured and structured before a traditional hot press cycle, allowing the impregnation resin to remain at least partially uncured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If melamine-based impregnation resin is used in hot press processes, then good mechanical resistance and chemical resistance are achieved, but high energy consumption occurs due to evaporation of water and precuring of the resin
Solution Approach 1:
The patent changes the chemical composition parameters of the impregnation resin from melamine-based to isocyanate-polyol based resin, fundamentally altering the curing mechanism from water evaporation/precuring to a different chemical reaction pathway that requires less thermal energy input while maintaining the desired mechanical and chemical resistance properties
Solution Approach 2:
The patent replaces the thermal-mechanical precuring process (evaporation and heating) with a chemical curing process using isocyanate-polyol resin that can cure at lower temperatures or through different mechanisms, substituting the energy-intensive mechanical/thermal system with a more efficient chemical reaction system
2Reliability
If melamine-based impregnation resin is used, then good mechanical resistance is achieved, but formaldehyde emissions occur which are potentially carcinogenic
Solution Approach 1:
The patent extracts and removes the harmful formaldehyde component by completely replacing the melamine-based resin system with an isocyanate-polyol based resin system that does not contain or release formaldehyde, while preserving the essential mechanical resistance function through the new resin chemistry
Solution Approach 2:
The patent substitutes the problematic melamine resin with an alternative isocyanate-polyol resin system that achieves the same functional purpose (mechanical resistance) without the harmful byproducts, effectively replacing the harmful material with a benign alternative
3Reliability
If melamine-based impregnation resin is used, then good chemical resistance is achieved, but color intensity decreases when surface roughness increases or gloss level decreases
Solution Approach 1:
The patent changes the resin system parameters from melamine to isocyanate-polyol, which fundamentally alters the surface properties and light interaction characteristics, allowing the surface to maintain color intensity even when roughness or gloss level is modified for aesthetic purposes
4Reliability
If melamine-based impregnation resin is used, then good mechanical resistance is achieved, but soft touch haptics are hard to achieve
Solution Approach 1:
The patent employs composite material principles by combining isocyanate-polyol resin with specific additives and surface modifiers that create a composite surface structure, achieving both mechanical resistance from the resin matrix and soft touch haptics from the modified surface layer
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
This approach reduces energy consumption, minimizes defects in the final cured surface, and achieves a high-quality, defect-free decorative sheet with improved haptic properties and acoustic performance.
Implementation Method 1
partially curing said curable coating
Implementation Method 2
The curable coating is partially cured and structured
Implementation Method 3
During pressing, the melamine resin will shortly liquify and flow, adapting to the surface structure and gloss level of the mold it is pressed against. While being under pressure and at the elevated temperatures in the mold the melamine resin is cured to the desired level
Data Source
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AI summary
In a first aspect, the present invention provides a method of manufacturing a decorative sheet comprising the steps of: - Providing a carrier sheet, - Impregnating the carrier sheet with a curable impregnation resin, - providing a curable coating on the top surface of the impregnated carrier sheet, partially curing said curable coating and structuring its top surface, while leaving the curable impregnation resin at least partially uncured. Further, a method for manufacturing a decorative panel comprising the step of manufacturing a decorative layer using the above method and adhering said decorative layer as a decorative top layer to a substrate is provided as well. In a second aspect, the present invention provides a decorative sheet comprising: - a carrier sheet impregnated with a curable impregnation resin, - a curable coating on the top surface of the impregnated carrier sheet, characterized in that said curable coating is partially cured and having a structured top surface, and that the curable impregnation resin is at least partially uncured. Further, the present invention provides a decorative panel comprising a substrate and a decorative top layer comprising a decorative sheet as described above.