Refat Mohamed, Maertens Robert, Weiss Patrick, Henning Frank, Schulze Volker, Liebig Wilfried V
Institute for Applied Materials-Materials Science and Engineering, Karlsruhe Institute of Technology (KIT), Engelbert-Arnold-Str. 4, 73161 Karlsruhe, Germany.
Fraunhofer Institute for Chemical Technology ICT, Joseph-von-Fraunhofer-Str. 7, 76327 Pfinztal, Germany.
Polymers (Basel). 2025 Feb 28;17(5):651. doi: 10.3390/polym17050651.
In this study, the effect of various parameters of a single screw extruder on the rheology and mechanical properties of a polylactic acid (PLA) filament with a 1.75 mm diameter was investigated. The barrel temperature, nozzle and cooling bath temperature, screw speed, nozzle diameter, water bath length, and distance to the nozzle were the process variables. A Taguchi experimental design was implemented using an L8 orthogonal matrix with seven factors and two levels, and their influence on roundness and diameter were evaluated. Among the various processing parameters, the temperature of the cooling bath affected the roundness the most. The mechanical properties and surface roughness of the PLA filament were examined using a tensile test and nanofocus optical system, respectively. Moreover, to assess the filament's reliability and investigate its behavior further, the filament was used to print 0° plates, and then dog-bone samples were cut from them to evaluate the mechanical properties of the printed specimens. Finally, the results indicate that improved-roundness filaments of 0.004 mm can lead to enhanced mechanical properties in 3D-printed samples with 3.54 MPa.
在本研究中，研究了单螺杆挤出机的各种参数对直径为1.75毫米的聚乳酸（PLA）长丝的流变学和机械性能的影响。料筒温度、喷嘴和冷却浴温度、螺杆速度、喷嘴直径、水浴长度以及到喷嘴的距离是工艺变量。采用具有七个因素和两个水平的L8正交矩阵进行田口实验设计，并评估它们对圆度和直径的影响。在各种加工参数中，冷却浴温度对圆度影响最大。分别使用拉伸试验和纳米聚焦光学系统检查了PLA长丝的机械性能和表面粗糙度。此外，为了评估长丝的可靠性并进一步研究其行为，将长丝用于打印0°板，然后从中切割出狗骨形样品以评估打印试样的机械性能。最后，结果表明，圆度为0.004毫米的改进型长丝可使3D打印样品的机械性能提高至3.54兆帕。
