3D Printer Head for Continuous Fiber Thermoset Extrusion
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Solution Overview
Problem
Current printer heads for three-dimensional printing of continuous fiber-reinforced thermoset composites are limited to thermoplastics or thermosets with fast curing mechanisms, suffer from weak interfacial strength and void formation, and lack robust designs for thermally-curable resins, leading to poor mechanical properties and complex structure fabrication.
Innovation Solution
A printer head design featuring a deposition syringe with an air chamber and fiber housing, utilizing controlled air pressures to prevent resin backflow and ensure smooth extrusion of thermally-curable or UV-curable composites, enabling strong interfacial bonding and void reduction through covalent bonds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional manufacturing methods (injection molding, filament winding, pultrusion) are used, then mass production efficiency is improved, but the overhead cost of tooling and labor for assembly increases significantly
Solution Approach 1:
The patent extracts the molding tool from the manufacturing process by using a moldless 3D printing approach. The direct ink writing technique allows composite materials to be deposited directly onto the substrate without requiring expensive injection molds or pultrusion tooling, thereby eliminating the overhead cost of tooling while maintaining production capability.
Solution Approach 2:
The system uses a self-contained direct ink writing printer that integrates material storage, mixing, and deposition functions. The printer head contains built-in reservoirs for resin and hardener, mixing chambers, and deposition nozzles, allowing the system to service itself without external tooling or assembly operations.
2Productivity
If 3D printing with fast curing thermosets is used, then printing speed is improved, but interfacial strength becomes weak and void formation increases
Solution Approach 1:
The patent applies preliminary action by pre-heating the substrate before deposition and controlling the deposition temperature to optimize curing. This preliminary thermal preparation ensures that the thermoset composite cures properly upon deposition, achieving both fast printing speed and strong interfacial bonding without void formation.
Solution Approach 2:
The system changes physical parameters by controlling temperature, deposition rate, and curing conditions. By optimizing these parameters, the patent achieves fast curing of thermoset composites while maintaining strong interfacial strength and preventing void formation through precise control of the deposition and curing process.
3Ease of operation
If FDM-based methods with pre-determined resin-fiber combination are used, then ease of operation is improved, but material versatility is limited to thermoplastics
Solution Approach 1:
The patent creates a universal direct ink writing system that can process multiple material types including thermoset composites, thermoplastics, and different fiber reinforcements. The system uses interchangeable cartridges for resin and hardener, and can accommodate different fiber types, providing multi-functionality while maintaining ease of operation through standardized loading procedures.
Solution Approach 2:
The system segments the material delivery system into separate cartridges for resin and hardener, plus separate fiber feed mechanisms. This segmentation allows independent control and replacement of each material component, enabling versatile material selection while maintaining simple operation through modular cartridge-based loading.
4Reliability
If check valve is used to prevent resin backflow, then resin containment is improved, but fiber extrusion friction increases
Solution Approach 1:
The patent introduces an intermediary air pressure control mechanism between the resin reservoir and the deposition nozzle. By using controlled air pressure to push the resin forward, the system prevents backflow without requiring a check valve in the fiber path, thereby eliminating the friction that would impede fiber extrusion while maintaining reliable resin containment.
Solution Approach 2:
The system uses pneumatic pressure control to manage resin flow and prevent backflow. Air pressure is applied to the resin reservoir to push material through the deposition head, replacing the need for mechanical check valves that would create friction against fiber extrusion, thus achieving both resin containment and smooth fiber delivery.
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 enables high-quality, mechanically robust 3D printing of thermoset composites with improved stiffness and strength, allowing for complex structures and curved surface deposition without sacrificial materials, expanding the scope of printable materials and applications.
Implementation Method 1
utilizing controlled air pressures to prevent resin backflow
Implementation Method 2
ensure smooth extrusion of thermally-curable or UV-curable composites, enabling strong interfacial bonding and void reduction through covalent bonds
Implementation Method 3
UV-curable composites
Data Source
AI summary
A printer head for three-dimensional printing of a continuous fiber-reinforced thermoset composite may include a deposition syringe, a fiber housing, and a feeding tube. The deposition syringe may define a resin reservoir, an air chamber, and a first inlet port configured to deliver a first flow of air to the air chamber. The deposition syringe may include a syringe body and a piston. The syringe body may include an inlet section, a needle section, and a converging section disposed between the inlet section and the needle section. The fiber housing may define a fiber chamber and a second inlet port configured to deliver a second flow of air to the fiber chamber. The feeding tube may extend from the fiber chamber to the needle section and may be configured to receive the second flow of air therein and to guide a fiber from the fiber chamber to the needle section.