Morphological Characteristics According to the 3D Printing Extrusion Temperature of TPU Filaments for Different Hardnesses 


Vol. 59,  No. 1, pp. 36-46, Feb.  2022
10.12772/TSE.2022.59.036


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  Abstract

Thermoplastic polyurethane (TPU) is used in various fields because of its excellent elasticity, flexibility, mechanical strength, and shock absorption. In particular, in the fused deposition modeling (FDM), in which layers are extruded by heating and melting thermoplastic materials through a nozzle, the adhesion and mechanical properties of the output are affected according to the nozzle temperature. In this study, six types of TPU filaments with various hardnesses (65A, 75A, 80A, and 85A) were manufactured through commercial chip and synthesis (comp) and extruded under five nozzle temperature conditions (190 °C, 200 °C, 210 °C, 220 °C, and 230 °C). Then, the most suitable nozzle temperature for the filament was confirmed, and the re-entrant pattern was printed. Extruded filaments and printed re-entrant patterns were analyzed through morphology analysis. Finally, the tensile properties of the two samples of the optimal printed condition for FDM 3D printing were examined. Consequently, the optimal nozzle temperature of each TPU filament was confirmed as 190 °C for Chip-65A, 210 °C for Chip-75A, 210 °C for Chip- 80A, 200 °C for Chip-85A, 210 °C for Comp-75A, and 200 °C for Comp-85A. Through printing re-entrant patterns and morphologies, Chip-75A and Comp-75A were considered to be the most suitable for 3D printing. The tensile properties showed that Chip-75A was more flexible than Comp-75A.

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pISSN : 1225 - 1089
eISSN : 2288 - 6419

한국연구재단 우수등재학술지 유지 (2022년)