WPC Wall Panel Tongue-and-Groove Joint Design
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Solution Overview
Problem
Current wall panels for bathrooms require extrusions and silicone seals to prevent water ingress, which detract from aesthetics and maintenance, and the silicone seals degrade over time, compromising the integrity of the installation.
Innovation Solution
A water-impervious wall panel system using a wood-plastics composite foamed board core with high-pressure laminate and a tongue-and-groove interlocking system, eliminating the need for extrusions and providing a tight, gap-free join with a rolled edge for aesthetic appeal and improved installation security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If wood based substrates with unfinished edges are used, then manufacturing is simple and cost-effective, but water ingress and delamination occur requiring extrusions and silicone seals
Solution Approach 1:
The patent uses a composite core material consisting of wood fibre and plastics (such as polyethylene or polypropylene) that inherently resists water ingress. This composite structure eliminates the need for additional protective extrusions and silicone seals while maintaining manufacturing simplicity and cost-effectiveness.
Solution Approach 2:
The patent applies a laminate layer (such as high-pressure laminate or plastic coating) over the wood fibre core to create a water-impermeable barrier. This thin film protection maintains the simplicity of the panel structure while ensuring reliability against water ingress and delamination.
2Reliability
If silicone seals are used to protect from water ingress, then water protection is achieved, but the seals break down over time and require replacement
Solution Approach 1:
The patent removes silicone seals and extrusions from the system entirely by using a wood fibre-plastic composite core that inherently resists water. This eliminates the component subject to degradation over time, thereby extending the service life of the wall panel system.
Solution Approach 2:
The patent changes the material parameters of the core from pure wood fibre to a wood fibre-plastic composite, fundamentally altering the material's resistance to water and degradation. This parameter change eliminates the need for protective seals that would otherwise require periodic replacement.
3Reliability
If extrusions are used to protect panel edges, then water ingress is prevented, but the aesthetic quality and maintenance benefits are reduced
Solution Approach 1:
The patent uses a wood fibre-plastic composite core that provides inherent water resistance without requiring visible extrusions. The composite material can be finished with laminates or coatings that provide a clean, aesthetic appearance while maintaining water ingress prevention.
Solution Approach 2:
The patent applies laminate layers or plastic coatings that create a smooth, continuous surface over the panel edges, providing water protection without the need for bulky extrusions. This maintains aesthetic quality while ensuring reliable water ingress prevention.
4Strength
If tongue-and-groove joints with contact area across full thickness are used, then structural strength is improved, but visible gaps appear at the front face
Solution Approach 1:
The patent positions the contact area of the tongue-and-groove joint locally at the rear face or within the thickness of the panel rather than across the full thickness. This local positioning maintains joint strength while preventing visible gaps at the front face, achieving both structural and aesthetic requirements.
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 offers a durable, aesthetically pleasing, and cost-effective water-impervious panel system that maintains installation integrity without extrusions, tolerates uneven walls, and provides excellent insulation and reduced condensation.
Implementation Method 1
a high pressure laminate adhesively attached to the core
Implementation Method 2
tongue-and-groove edges form an interlocking system
Implementation Method 3
core of wood plastics composite foamed board... excellent insulating characteristics
Data Source
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AI summary
A wall panel 20, 30 suitable for bathrooms, wetrooms and the like is disclosed. The panel is water impervious and comprises a core of wood plastics composite (WPC) and a laminate adhesively attached to the core. In preferred embodiments, the core is a wood plastics composite foamed board. The wood plastics composite preferably comprises PVC and wood fibre. The wood plastics composite may include recycled materials. The wall panel may be provided with a tongue-and-groove interlocking system with tongue and groove edges 21, 31 and 32. The system is configured to provide a contact area across less than the thickness of the panel which achieves a tight join at the front face and eliminates a visible gap. It also increases tolerance for machining errors or variation. The tongue-and-groove interlocking system is designed to provide tolerance for walls which are not precisely planar but may be bowed or uneven to a certain extent.