Thermoplastic Composite Surface Layer Processing
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Solution Overview
Problem
Thermoplastic composites face challenges in high processing temperatures, pressures, and prolonged molding times, limiting their use in large-scale applications due to difficulties in achieving void-free matrixes and efficient consolidation, which hampers productivity and increases costs in aerospace and automotive industries.
Innovation Solution
Development of thermoplastic compositions with a core composite layer containing a high-performance polymer and a surface layer polymer that forms a polymer blend, allowing for lower processing temperatures and faster crystallization rates, enabling in-situ consolidation on automated tape laydown machines without the need for autoclave or oven steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If thermoplastic compositions are used to impregnate reinforcing material, then benefits include rapid fabrication and recyclability, but the high viscosity of melted polymers makes impregnation more difficult compared to thermosetting compositions
Solution Approach 1:
The patent applies parameter changes by controlling the temperature to match the melting point of the thermoplastic polymer, temporarily reducing viscosity during impregnation, then increasing temperature during consolidation to facilitate flow and bonding without requiring excessive pressure
Solution Approach 2:
The patent employs periodic action through cyclic heating and pressing during the consolidation process, with heating cycles to melt the polymer and pressing cycles to consolidate the laminate, repeated multiple times to achieve void-free consolidation
2Manufacturing precision
If thermoplastic composites are processed with high temperatures and pressures to achieve void-free matrixes, then consolidation quality improves, but processing time increases and productivity decreases
Solution Approach 1:
The patent utilizes phase transitions of the thermoplastic polymer, heating it to its melting point to transition from solid to liquid state for easy impregnation and consolidation, then cooling to solidify the matrix and lock in the void-free structure
Solution Approach 2:
The patent applies preliminary action by pre-heating the thermoplastic polymer to its melting point before impregnation, ensuring it is in a low-viscosity state ready for rapid infiltration of the reinforcing material, and pre-positioning layers for efficient consolidation
3Reliability
If high processing temperatures and prolonged molding times are used for thermoplastic composites, then consolidation quality improves, but energy consumption increases and production costs rise
Solution Approach 1:
The patent optimizes parameter changes by precisely controlling temperature to the polymer's melting point rather than using excessive heat, and limiting pressure application to only when necessary during consolidation cycles, reducing overall energy consumption while maintaining consolidation quality
Solution Approach 2:
The patent maintains continuity of useful action through automated cyclic heating and pressing operations that continuously progress the consolidation process without idle time, ensuring energy is applied only when needed for phase transitions or consolidation
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
This approach reduces production costs by 30% and initial capital investment, enabling faster processing speeds and lower energy consumption while maintaining high-performance composite quality, suitable for large-scale aerospace and automotive applications.
Implementation Method 1
a surface layer polymer... which is miscible and/or compatible with the polymer of the interlayer region
Implementation Method 2
a surface layer polymer... which is miscible and/or compatible with the polymer of the interlayer region
Implementation Method 3
an interlayer region containing at least one polymer that is high in crystallinity and either partially or fully crystallizes during the process window
Implementation Method 4
thermoplastic compositions... These polymers are highly viscous when melted
Implementation Method 5
lower melting and processing temperature than the polymer of the interlayer region
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
Thermoplastic composites having a core composite layer (20) including a fibrous substrate and one or more high performance polymer, and a surface layer (10) polymer applied to at least one surface of the core composite layer, which forms a polymer blend with the high performance polymer thereby imparting improved toughness and processing times, and methods for making and using same, are provided herein.