Reusable Cartridge for RTM Resin Injection
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Solution Overview
Problem
Current Resin Transfer Molding (RTM) methods face challenges in achieving high production rates due to complex and time-consuming operations, frequent solvent-based cleanings, lack of resin degassing capabilities, safety concerns for workers, and process variability affecting part quality.
Innovation Solution
A cartridge-based system for resin injection that includes a cylindrical cartridge with a piston and locking mechanism, allowing for efficient resin handling, degassing, and cleaning, reducing manual operations and exposure to solvents, while maintaining precise control over resin flow and pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If manual loading, degassing, and cleaning of resin is performed using traditional PD injectors or pressure pots, then resin injection can be achieved, but additional process time is required and operator exposure to resin and solvents increases
Solution Approach 1:
The injection system is divided into separate functional modules: a reusable cartridge that can be quickly exchanged, a resin storage container, and an injection mechanism. This segmentation allows the cartridge to be pre-filled and prepped separately, enabling parallel processing and reducing overall cycle time while minimizing operator exposure during critical injection phases.
Solution Approach 2:
Resin is loaded into the cartridge container and degassed in advance before the actual injection process. The cartridge is prepared, sealed, and ready for immediate use, eliminating the need for time-consuming manual loading and degassing operations during production cycles.
2Reliability
If frequent solvent-based cleaning is performed on injection systems, then resin buildup is removed, but operator exposure to solvents increases and additional process time is consumed
Solution Approach 1:
The cartridge is designed as a disposable or limited-life component that is discarded after a certain number of uses or when contamination occurs. This eliminates the need for frequent solvent-based cleaning of the entire injection system, reducing both time loss and operator exposure to harmful solvents while maintaining injection reliability.
Solution Approach 2:
The potentially contaminated cartridge is extracted and removed from the injection system as a separate unit. This isolates the contamination issue to a removable component, allowing the main injection system to remain clean without requiring extensive solvent cleaning operations.
3Productivity
If traditional injection systems are used, then resin injection is achieved, but complex operations and lack of automation affect production efficiency
Solution Approach 1:
The cartridge system is designed to be self-contained and self-explanatory, with features like alignment guides, snap-fit connections, and visual indicators that enable quick changeover without requiring complex manual operations or extensive operator training. The system serves itself through standardized interfaces that minimize the need for manual adjustment.
Solution Approach 2:
The cartridge design incorporates universal features that allow it to work with different resin types and injection parameters. The standardized interface and modular design enable the same basic system to handle multiple product variations, reducing the need for complex reconfiguration and manual operations when changing production runs.
4Manufacturing precision
If process variability is present in traditional injection systems, then part quality consistency is affected, but automation and control can improve consistency
Solution Approach 1:
The cartridge design incorporates features that standardize critical parameters such as resin volume, pressure, and temperature control. By pre-configuring these parameters in the cartridge design itself rather than relying on complex real-time adjustments, the system achieves consistent part quality without requiring overly complex automation control systems.
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 cartridge system enhances RTM production efficiency by reducing cycle time, improving resin handling safety, and ensuring consistent part quality through automated processes and reduced solvent use, supporting higher production rates without compromising mechanical properties.
Implementation Method 1
The piston is connected to an actuator which translates the piston up the cartridge displacing resin out and into the mold
Implementation Method 2
sealing resin from leakage at typical process temperatures of 250°F (∼120°C), injection pressures of 250 psi (∼1.7 MPa), and vacuum greater than 1 torr (∼100 Pa)
Implementation Method 3
A high vacuum is typically applied to the mold before and during injection to improve part quality and resin flow throughout the mold
Data Source
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AI summary
Reusable cartridges allow the time consuming resin preparation and processing steps to occur offline and not affect the cycling time of the injector. Cartridges also greatly simplify the operation of RTM injectors as preparation simply consists of loading a warmed ready-to-use resin cartridge and performing the injection.