Partially Cured Coated Sheets for Non-Tacky Thermal Lamination
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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, especially in melamine and PVC layers, which affect the appearance and durability of laminate surfaces.
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 thermo-initiators and optional additives, allows for non-tacky storage and precise structuring during thermal lamination, achieving excellent matt and gloss effects and improved adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a melamine resin top layer is used, then wear resistance is improved, but clicking sounds occur during use
Solution Approach 1:
The patent uses a composite structure combining a melamine resin top layer with a PVC layer underneath. The melamine layer provides wear resistance while the PVC layer acts as a sound-damping component that reduces clicking sounds during panel use and installation.
Solution Approach 2:
The PVC layer serves as an intermediary between the melamine top layer and the substrate, absorbing mechanical stresses and preventing the transmission of clicking sounds while maintaining the structural integrity of the laminate panel.
2Object-generated harmful factors
If a PVC top layer is used, then clicking sounds are reduced, but scratch resistance decreases and the layer must be thicker
Solution Approach 1:
The patent creates a composite laminate structure where the melamine resin top layer provides scratch resistance and wear resistance, while the PVC layer underneath reduces clicking sounds. This composite approach allows each material to contribute its strengths without requiring the PVC layer to be both sound-damping and scratch-resistant.
Solution Approach 2:
The top layer is segmented into two distinct functional layers: a thin melamine resin layer for wear and scratch resistance, and a thicker PVC layer for sound damping. This segmentation allows optimization of each layer's thickness and properties independently.
3Reliability
If UV curing is used for the top layer, then surface properties are improved, but health risks from photo-initiators increase
Solution Approach 1:
The patent removes photo-initiators from the coating formulation entirely, replacing UV curing with thermal curing. This extraction of the harmful substance eliminates health risks while maintaining the crosslinking and surface property improvements through alternative thermal polymerization mechanisms.
4Strength
If a thick PVC layer is used, then wear resistance is improved, but the plastic-like appearance reduces realism
Solution Approach 1:
The patent uses a composite structure where the thin melamine resin top layer provides wear resistance without adding thickness, while the PVC layer underneath can be optimized for sound damping. The melamine layer's thinness allows for sharp, realistic embossed textures while maintaining protective properties.
Solution Approach 2:
The patent applies different material properties at different depths: the top surface layer (melamine) is optimized for wear resistance and texture fidelity, while the underlying layer (PVC) is optimized for sound damping. This local differentiation allows each layer to perform its specific function optimally.
5Reliability
If the coating layer is fully cured, then adhesion is improved, but storage stability decreases due to tackiness
Solution Approach 1:
The patent applies a preliminary thermal curing treatment during the lamination process before final cooling and storage. This preliminary action creates sufficient adhesion during processing while the coating remains storable once cooled, as the crosslinking is completed during the thermal press rather than requiring post-processing curing.
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 provides non-tacky sheets that can be stored longer, achieve precise structural copying, and ensure excellent adhesion and durability, suitable for outdoor applications with enhanced scratch resistance and realistic surface textures.
Implementation Method 1
The coating layer is partially cured. 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
Implementation Method 2
The sheet can be thermally pressed onto a substrate by means of a structured press at elevated temperatures
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.