Polyamide Roller for Automated Fiber Placement Heat Dissipation
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Solution Overview
Problem
Automated fiber placement machines face challenges in producing highly contoured structures due to the lack of conformability and thermal conductivity in conventional rollers, leading to inefficient heat dissipation and potential roller degradation, which can introduce foreign object debris.
Innovation Solution
A polyamide composition with thermal conductivity ranging from 0.2 to 50 W/mK, incorporating an aromatic dicarboxylic acid, hydroxy benzoic acid, and an amino terminated perfluorinated alkyl ether polymer or oligine, along with thermally conductive fillers like carbon-based materials, is used to create rollers that maintain flexibility and enhance heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If soft polymer rollers are used to provide conformability for complex contoured surfaces, then the ability to fabricate highly contoured structures is improved, but thermal conductivity deteriorates leading to poor heat dissipation and roller wraps
Solution Approach 1:
The patent employs composite material construction by combining soft polymer matrix with thermally conductive fillers (such as metal particles, carbon-based materials, or ceramic particles). This composite approach allows the roller to simultaneously achieve conformability from the polymer phase and thermal conductivity from the filler phase, resolving the contradiction between softness and heat dissipation capability
Solution Approach 2:
The patent modifies the thermal conductivity parameter of the polymer material by incorporating fillers with varying thermal conductivities and concentrations. By adjusting the type, amount, and distribution of thermally conductive fillers, the material's thermal properties are tuned to achieve optimal heat dissipation while maintaining the required conformability and softness
2Temperature
If metal rollers are used to provide thermal conductivity for efficient heat dissipation, then heat dissipation capability is improved, but conformability deteriorates making them unsuitable for complex contoured surfaces
Solution Approach 1:
Instead of using pure metal rollers, the patent creates a composite where metal or carbon-based thermally conductive fillers are dispersed within a soft polymer matrix. This allows the roller to inherit the thermal conductivity of the filler particles while the polymer continuous phase provides the necessary conformability and flexibility for complex contoured surfaces
Solution Approach 2:
The thermally conductive fillers are distributed throughout the polymer matrix to create localized thermal conduction pathways. This local quality approach ensures that heat dissipation occurs at specific points where fillers are concentrated, while the overall roller maintains the soft, conformable characteristics of the polymer base material
3Adaptability or versatility
If soft polymer rollers are used to provide conformability, then the ability to follow complex contours is improved, but thermal conductivity deteriorates causing roller degradation and foreign object debris
Solution Approach 1:
The incorporation of thermally conductive fillers in the soft polymer matrix creates a composite roller that maintains conformability while achieving sufficient thermal conductivity to prevent overheating. This resolves the reliability issue by ensuring the roller can dissipate heat effectively during high-temperature layup operations, preventing degradation and FOD generation
Solution Approach 2:
By modifying the thermal conductivity parameter of the polymer material through filler incorporation, the operating temperature range and thermal stability of the roller are improved. This parameter change allows the roller to withstand high-temperature conditions without degradation, thereby enhancing reliability while maintaining conformability
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 provides rollers with improved thermal conductivity and flexibility, reducing the risk of degradation and foreign object debris, while maintaining low surface energy for reduced adhesion, thus enabling efficient fabrication of complex contoured structures.
Implementation Method 1
The composition may include a thermal conductivity of from about 0.2 to about 50 Watts per meter Kelvin (Wm−1K−1)
Implementation Method 2
they lack the thermal conductivity to efficiently dissipate heat, particularly during high temperature layups
Data Source
AI summary
Compositions including a polyamide, and compaction rollers for an automated fiber placement machine incorporating the composition are provided. The polyamide may be a reaction product of at least one diamine and an aromatic dicarboxylic acid, a hydroxy benzoic acid, or their respective ester or acyl halide derivatives. The at least one diamine may include an amino terminated perfluorinated alkyl ether polymer or oligomer. The composition may have a thermal conductivity of from about 0.2 to about 50 Watts per meter Kelvin (Wm−1K−1).