Study on Particle Emissions of Material-Extrusion-Type Desktop 3D Printing: the Effects of Infill

• Main Authors: Li-Ci Zhang, 張俐慈
• Other Authors: Yih-Lin Cheng
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/8g4u65

碩士 === 國立臺灣科技大學 === 機械工程系 === 106 === Recently, a large number of material-extrusion-type 3D printers have been used, but there is usually no air quality control in their working environment. Therefore, the pollutions of particle emissions will be an important issue. In the general printing parameter settings, infill is commonly used in printing to reduce weight and time, but rare research studies the effects of infill in particle emissions. Hence, in this research, particle emission behaviors with the existence of infill were investigated. Preliminary test results that the measured particle concentrations of ABS samples showed a peak emission during the 1st top solid layer printing, which was the first layer after infill. Further experiments were conducted to evaluate the effects of infill height, infill density, infill pattern, and feed rate of the 1st top solid layer printing. Consequently, less infill height, higher infill density, more intensive infill pattern and slower feed rate would lead to less particle emissions and a smaller peak value. Based on the experimental results, this study concluded that the material stuffed around the nozzle was the main reason for the peak emissions and it occurred when the non-solid structure inside the model cannot provide enough contact points to the printing of first layer of top layer. However, this experiment proved that 96% of the peak emissions of particles can be reduced by adopting appropriate infill printing parameter settings (30% infill density and 30mm/s feed rate in the 1st top solid layer printing). In the end of the study, the particle removal device was turned on at a certain time according to the discovery of the peak phenomenon. The result showed that it was only necessary to open the device during the top printing period to achieve effective filtering and energy saving requirements at the same time.