Structured Foam Sandwich Panel for Lightweight Caravan Construction
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Solution Overview
Problem
Existing methods for producing planar components for applications like caravans and mobile homes face challenges in achieving reduced weight and stable production costs while maintaining mechanical properties, durability, temperature resistance, weathering resistance, and recyclability, with a need for improved surface quality and design flexibility.
Innovation Solution
A method involving a three-layer sandwich panel with a structured middle layer made of low-density polymer foam, covered by fiber-reinforced top layers, where the middle layer's surface structure enhances ventilation, adhesion, and mechanical properties, allowing for cost-effective production and integration of additional features like insulation and structural reinforcement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a dense, solid material is used for the middle layer to ensure mechanical strength, then the panel achieves adequate load-bearing capacity, but the overall weight of the panel increases
Solution Approach 1:
The middle layer uses a foam material with controlled porosity, creating a cellular structure that provides mechanical strength through the three-dimensional network of cell walls while maintaining low density. The foam structure achieves an optimal balance between weight reduction and load-bearing capacity.
Solution Approach 2:
The panel employs a composite sandwich structure combining the foam middle layer with fiber-reinforced cover layers. This composite construction allows each material to contribute its strengths: the foam provides lightweight core support while the fiber layers provide surface strength and stiffness.
2Ease of manufacture
If a smooth, flat middle layer surface is used to simplify manufacturing, then production costs decrease, but the adhesion between layers and surface quality deteriorate
Solution Approach 1:
The middle layer surface features localized structuring with patterns of grooves or recesses that create mechanical interlocking points. These localized surface modifications enhance adhesion at critical interfaces while maintaining manufacturing efficiency through standardized patterning processes.
3Reliability
If ventilation channels are added to the middle layer to improve curing and adhesion, then layer bonding improves, but the manufacturing complexity increases
Solution Approach 1:
The middle layer surface is segmented into repeating patterns of grooves, channels, or recesses that serve as ventilation pathways and adhesion zones. This segmentation allows air and resin to distribute evenly during curing while maintaining a relatively simple overall structure through modular patterning.
Data Source
Figure 1
Figure 2
AI summary
The surface component has three sandwiched stacked layers in sections. A center layer (10) on both sides of the surface component is covered by a cover layer. Surfaces of the center layer exhibit a surface structure (14) in sections. The surface structure exhibits cross grooves. The center layer is made of a material i.e. polystyrene-based polymer foam, with a cellular structure. The cover layer is made of fiber-reinforced material i.e. glass fiber reinforced plastic. The surface component is made of polyurethane-based polymer foam. Auxiliary components are enclosed in the cover layers. An independent claim is also included for a method for manufacturing a surface component.