| Summary: | 碩士 === 國立臺灣科技大學 === 自動化及控制研究所 === 106 === Inkjet technology is commonly used in material jetting and binder jetting technology. The use of piezoelectric print head has advantages of high precision, high printing frequency and high material compatibility. However, during the printing process, there are some drawbacks such as clogged or partially blocked nozzles, which will result in printing defects.
The main purpose of this study is to improve the stacking of ink droplets, accelerate the printing speed, and compensate for defects based on material jetting technology. The first step is to determine the optimal roller speed for this study. Then, this study creates a back-and-forth printing mode and compares the surface quality, printing size, and surface roughness with the standard printing mode. Finally, offset printing method is used to fill in defects on a printed layer.
According to the experiment results, a minimum surface roughness is obtained by using a roller speed of 695 rpm in this system. While the back-and-forth printing mode can save about 38% of the printing time compared with the standard printing mode. However, the dimensional accuracy in the Y direction is poor, and the surface roughness is also larger than the standard printing mode. The compensation printing method can effectively fill the defects on the printed layer, but it takes time to use laser displacement sensor to scan the position of clogged nozzles before printing process offline and compensatory printing. The user can choose to whether use the back-and-forth printing mode or compensation method or not according to the usage situation or the product requirement.
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