Polymeric Sheet Pressing for Wood Embossing and Binder Curing
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Solution Overview
Problem
The natural embossed structure of wooden surfaces is often compressed during pressing, leading to a reduction in visual appeal and uneven pressure distribution, which can result in incomplete curing of thermosetting binders and unsightly hazy or white-colored portions.
Innovation Solution
The use of an elastic or formable sheet with a polymeric material, such as an elastomeric or thermoplastic material, positioned between the wooden surface and a non-structured press surface to uniformly distribute pressure and retain or enhance the natural embossing, ensuring complete curing of the thermosetting binder.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If pressure is applied to adhere the wooden surface to the board, then the bonding strength is improved, but the natural embossed structure of the wooden surface is compressed and reduced
Solution Approach 1:
A polymeric sheet is introduced as an intermediary layer between the press plate and the wooden surface. This sheet distributes the applied pressure uniformly across the surface, preventing localized compression of the embossed structure while maintaining sufficient bonding pressure for adhesion. The polymeric sheet acts as a mediator that reconciles the conflicting requirements of strong bonding and structure preservation.
Solution Approach 2:
The pressurization process is modified by changing the pressure distribution parameter from concentrated to uniform through the use of the polymeric sheet. This parameter change allows the same overall pressure to be applied without locally compressing the embossed portions, thereby maintaining the natural structure while achieving adequate bonding strength.
2Shape
If an embossed press plate is used to form an embossed structure, then the visual appeal is improved, but the embossing is not in register with the natural pattern of the wooden surface
Solution Approach 1:
The embossing function is extracted from the press plate itself and instead allowed to emerge from the natural wooden surface structure. By using a smooth or non-structured press plate combined with a polymeric sheet, the natural embossed pattern of the wood is preserved and enhanced rather than imposed upon, eliminating the alignment problem between artificial embossing and natural grain patterns.
3Strength
If pressure is applied uniformly across the surface, then the bonding is improved, but the embossed portions receive insufficient pressure for complete binder curing
Solution Approach 1:
The polymeric sheet serves as a mediator that transmits and distributes pressure uniformly across the entire surface including embossed portions. The sheet's compliance allows it to conform to surface irregularities while maintaining consistent pressure transmission, ensuring complete binder curing in all areas including grooves and embossed regions, while maintaining uniform bonding strength across the surface.
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 method retains and sometimes increases the natural embossing of wooden surfaces, ensures uniform pressure distribution, and improves the curing of thermosetting binders, resulting in a more aesthetically appealing and structurally sound building element.
Implementation Method 1
arranging an elastic sheet comprising a polymeric material between the wood veneer layer and a press surface of a pressing device
Implementation Method 2
applying a thermosetting binder on the substrate or on a wood veneer layer
Implementation Method 3
The thermosetting binder of the sub-layer permeates the wood veneer and when cured, locks the wood veneer in the compressed state
Implementation Method 4
applying heat and pressure by the pressing device on the elastic sheet, the wood veneer layer, the thermosetting binder, and the substrate
Data Source
AI summary
A method for producing a building element, including providing a substrate, applying a thermosetting binder on the substrate or on a wood veneer layer, arranging the wood veneer layer on the substrate with the thermosetting binder intermediate the substrate and the wood veneer layer, arranging an elastic or formable sheet including a polymeric material between the wood veneer layer and a press surface of a pressing device, applying heat and pressure by the pressing device on the elastic or formable sheet, the wood veneer layer, the thermosetting binder, and the substrate, thereby forming a building element including the substrate and the wood veneer layer attached to the substrate by the thermosetting binder, after applying heat and pressure, removing the elastic or formable sheet from the wood veneer layer. Also, a pressing device for embossing a wooden surface and a method of embossing a wooden surface.