About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Symposium
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2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
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Presentation Title |
Reducing Porosity of Extruded Fiber Reinforced Thermoplastics with a Vacuum-Assisted Pellet Hopper |
Author(s) |
Frye Mattingly, Vipin Kumar, Chad Duty, Wim Bras, Vlastimil Kunc |
On-Site Speaker (Planned) |
Frye Mattingly |
Abstract Scope |
Fiber-reinforced thermoplastics have higher theoretical stiffness and strength than neat thermoplastics. However, when they are 3D-printed using a pellet fed extruder they often exhibit a high degree of internal porosity which can negatively impact their functional properties. A measurable portion of this internal porosity is likely caused by the mechanical entrapment of air between pellets as they are fed into the single screw extruder of a large format AM system, such as the Big Area Additive Manufacturing (BAAM) system. This study attempts to reduce internal porosity by applying a vacuum to the feed hopper of a smaller-scale single screw extrusion system while depositing either carbon or glass fiber reinforced acrylonitrile butadiene styrene (CF-ABS, GF-ABS). Archimedes density analysis showed a significant improvement in the final density of the material after a vacuum was applied to the feed hopper. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |