Composite Panel with Alternating Fiber Axes and Thermal Bonding
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Solution Overview
Problem
Existing composite panels for vehicles, such as recreational vehicles and trailers, face challenges with rigidity, flexibility, and manufacturing complexity, particularly when curving wall sections, and often rely on adhesive layers that provide limited structural support and are difficult to apply uniformly.
Innovation Solution
A composite panel design featuring multiple polymer plies with embedded fibers oriented at different axes, bonded together through lamination at specific temperatures without an adhesive layer, providing enhanced rigidity and flexibility by alternating fiber orientations and using polypropylene materials with defined melting temperatures for bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive layers are used to bond polymer plies, then the plies can be secured together, but the adhesive layers are difficult to apply uniformly and provide limited structural support
Solution Approach 1:
The patent removes the adhesive layer entirely from the composite panel construction. Instead of using adhesive to bond the polymer plies, the invention uses direct thermal lamination where the plies are heated to their melting temperature and pressed together, allowing the polymer material itself to act as the bonding agent through fusion.
Solution Approach 2:
The patent replaces the chemical bonding mechanism of adhesives with a thermal-mechanical bonding process. The polymer plies are heated above their melting temperature and then pressed together under pressure, using heat and mechanical pressure instead of chemical adhesives to achieve bonding.
2Strength
If multiple polymer plies with different melting temperatures are laminated, then bonding can be achieved at controlled temperatures, but the process requires precise temperature control above the highest melting temperature
Solution Approach 1:
The patent utilizes the different melting temperatures of the polymer plies as a key parameter to enable selective bonding. By controlling the lamination temperature to be above the melting point of the first polymer but below the degradation point of the second polymer, the invention achieves bonding of the first ply to the core while preserving the integrity of the second polymer.
Solution Approach 2:
The patent creates local bonding conditions by having different polymer materials with different thermal properties in different regions of the composite panel. The first polymer ply is designed to bond at a lower temperature range, while the second polymer ply remains stable at higher temperatures, allowing for staged or selective bonding operations.
3Strength
If fiber orientations are alternated between plies, then rigidity is enhanced along specific axes, but the manufacturing process becomes more complex
Solution Approach 1:
The patent divides the fiber reinforcement into separate plies, each with a specific fiber orientation optimized for particular load directions. The first and third plies have fibers oriented in one direction while the second ply has fibers oriented perpendicular to that direction, creating a segmented reinforcement strategy that addresses different structural requirements in different planes.
Solution Approach 2:
The patent creates a composite structure by combining multiple polymer plies with different fiber orientations and different polymer materials. This multi-layer composite approach allows the panel to exhibit enhanced rigidity and strength properties in multiple directions while maintaining the ability to bond through thermal lamination.
4Adaptability or versatility
If the composite panel is designed for curving sections, then flexibility is improved, but maintaining structural integrity and uniform bonding becomes more difficult
Solution Approach 1:
The patent employs thin polymer plies that inherently possess flexibility, allowing the composite panel to be formed into curved sections. The thermoplastic nature of the polymers enables the plies to be heated and shaped, and then bonded together while maintaining the desired curved geometry, creating a flexible yet structurally sound panel.
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 achieves increased rigidity along specific axes while allowing flexibility, reducing manufacturing complexity and eliminating the need for adhesive layers, thereby improving structural support and ease of application in curved sections.
Implementation Method 1
bonded together through lamination at specific temperatures
Implementation Method 2
bonded together through lamination at specific temperatures without an adhesive layer
Data Source
AI summary
A composite panel is provided comprising first and third polymer plies having fibers therein that are substantially parallel to a first fiber axis and a second polymer ply having fibers therein that are substantially parallel to a second fiber axis. The first polymer ply comprises material with a first melting temperature, and the second and third polymer plies comprise material with a second melting temperature higher than the first melting temperature. Plies are bonded together to form a composite by heating the plies at a first heating temperature that is higher than the second melting temperature. First polymer ply material is provided at a first side of the composite. The first side of the composite is positioned adjacent to the core, and the composite and the core are heated at a second heating temperature that is higher than the first melting temperature but lower than the second melting temperature.