Stereolithographic 3D Printing of Archimedes Screw Micromixer

• Main Authors: Jun-Ting Liu, 劉俊廷
• Other Authors: 單秋成
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/67490114669672546221

碩士 === 國立臺灣大學 === 機械工程學研究所 === 105 === Micromixers can be classified as passive or active micromixers. Passive micromixers improve mixing efficiency mainly by changing the geometry. When changing the geometry, it’s also necessary to keep the flow of microchannel without obstruction at the same time. So Archimede’s Screw is printed in the microchannel in this thesis. Taking advantage of thin-wall and multi-directional property of Archimede’s Screw, increasing mixing efficiency and keeping the channel permeable could simultaneously be expected. Although microstructure fabrication could be achieved successfully by using MEMS technology, it’s still difficult to produce multi-directional curved surface structure by using MEMS technology due to the limitation of mask. 3D Printing technology can manufacture complex surface with layer-by-layer technique but still has some difficulties in producing micron-level structure. This thesis investigates how to use DLP technology to fabricate micro and curved surface structure. At first refitting the sleeve of commercial projector has been executed. Then the effect of the exposure time, the layer thickness and the composition of resin on the process have also been studied. The objective is to produce the microstructure almost as same as adopting TPP(Two-photon Polymerization) by using DLP technology. Finally, micron-level Archimede’s Screw is successfully printed in the microchannel and mixing test has been done. The results reveal that this improved DLP technology has the ability to print the channel with a minimum width of 750 .