Powder-Based Balancing Layer for Building Panels
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Solution Overview
Problem
The production of thick, high-quality decorative surface layers with balanced and stable properties in building panels, especially in 'paper-free' wood fibre floors, is challenging due to shrinkage issues during curing, as existing methods rely on paper-based balancing layers that have different shrinkage properties in different directions and are difficult to adapt to varying surface layer thicknesses.
Innovation Solution
A method involving the application of a powder-based balancing or protective layer on a core, which is stabilized with a liquid substance to make it tacky and stick to the core, allowing for cost-efficient production and handling, and then cured simultaneously with the decorative surface layer under heat and pressure, using a wood fibre-based layer with random fibre direction to match the shrinkage properties of the surface layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a paper-based balancing layer is used, then the panel can be kept flat during production, but the layer has different shrinkage properties in different directions and is difficult to adapt to varying surface layer thicknesses
Solution Approach 1:
The patent changes the material parameters of the balancing layer from traditional paper-based materials to powder-based materials with controlled composition (fibre content, particle size distribution, binder type). This allows continuous adjustment of shrinkage properties to match different surface layer thicknesses and compositions, while maintaining panel flatness during production and use.
Solution Approach 2:
The patent employs composite powder-based materials combining fibres, wear-resistant particles, and binders in specific ratios. This composite structure enables tailored shrinkage characteristics that can be matched to various surface layer configurations, overcoming the limitations of homogeneous paper-based balancing layers.
2Strength
If a thick homogenous surface layer with high density is produced, then wear resistance and impact resistance are improved, but shrinkage tension on the panel increases during curing
Solution Approach 1:
The patent adjusts the powder composition parameters including fibre content, particle size distribution, and binder type to control the shrinkage behavior of the surface layer. By optimizing these parameters, the surface layer achieves high density and wear resistance while minimizing shrinkage tension that could cause panel deformation.
Solution Approach 2:
The patent applies a balancing layer specifically designed to counteract the shrinkage tension generated by the thick surface layer during curing. The balancing layer's composition is pre-calculated to provide equal and opposite shrinkage forces, preventing panel warping or deformation despite the high shrinkage tension from the dense surface layer.
3Strength
If powder technology is used to produce thick surface layers, then wear resistance is considerably higher, but the layer creates much higher tension on the panel when shrinking during curing
Solution Approach 1:
The patent uses composite powder materials with optimized fibre-to-particle ratios and binder selection to achieve high wear resistance while controlling shrinkage behavior. The composite structure allows the surface layer to maintain thickness and density for wear resistance while reducing excessive shrinkage tension through proper material composition.
Solution Approach 2:
The balancing layer acts as an intermediary element between the thick powder-based surface layer and the core board. It absorbs and distributes the shrinkage tension uniformly, preventing localized stress concentrations that would otherwise cause panel deformation despite the high wear resistance of the 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 method enables the production of building panels with a cost-efficient, stable, and balanced surface layer that maintains flatness and stability even in variable moisture conditions, reducing production costs and improving wear resistance and impact resistance.
Implementation Method 1
A method involving the application of a powder-based balancing or protective layer on a core, which is stabilized with a liquid substance to make it tacky and stick to the core
Implementation Method 2
cured simultaneously with the decorative surface layer under heat and pressure
Data Source
AI summary
A method of manufacturing a building panel with a decorative surface layer, a core and a balancing and/or protective layer, wherein the method includes applying a first layer of a first powder based mix, including wood fibres and a thermosetting binder, on a core; applying a liquid substance on the first powder based mix; drying the first powder based mix; turning the core with the dried first powder based mix such that the first powder based mix points downwards; applying a second layer on the upper part of the core; and curing the first and second layers by providing heat and pressure, wherein the first layer forms the balancing and/or protective layer and the second layer forms the decorative surface layer in the building panel.