Study of the print behavior of fillers in the material extrusion printing process = 재료 압출 인쇄 공정에서 필러의 인쇄 양상에 대한 연구

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Fused filament fabrication (FFF) with filled polymers has grown popularity due to the improved material properties. However, nozzle clogging is observed for higher filler contents, resulting in a failed print. Based on the flow behavior and filler orientation in an FFF nozzle, an experiment varying nozzle diameter, filler size, resin viscosity, and volume content is designed. Clogging of sphere-filled and fiber-filled polymers is investigated in a custom nozzle flow test device (NOFT). The ratio between nozzle diameter and filler diameter was found to have the highest effect on nozzle clogging. Sphere-filled polycarbonate was found to clog for ratios $\frac{D}{d}\leqq6.2$. A distribution in the ratio of Stokes‘s drag force to extrusion force was found to describe intermittent clogging of sphere-filled polymers. The flow behavior in an FFF nozzle was investigated with respect to nozzle diameter, filler size, resin viscosity, and volume content. A viscosity model to predict material printability was derived, based on the observations of the different factors studied and the required volume flow rate.
Advisors
Bae, Choongsikresearcher배충식researcher
Description
한국과학기술원 :기계공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 2018.2,[1 v. :]

Keywords

fused filament fabrication▼aFFF▼aextrusion▼afilled polymers▼areinforced feedstock▼anozzle clogging▼aprintability; 이용한 융합 수지 압출 적층 조형 기술▼a압출 성형▼a충전된 고분자▼a노즐 막힘▼a인쇄할

URI
http://hdl.handle.net/10203/265874
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=733699&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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