Dispersed ink mist occurs around ink jet nozzles and contaminates the inside of a thermal ink jet printer. It is required to clarify the fine droplet motion in order to prevent the contamination effectively. First, ink mist was visualized and airflow around ink jet nozzles was measured by Particle Image Velocimetry (PIV), when an ink jet carriage was scanned. Dispersed ink mist was observed at an upstream side of nozzles in scan direction, and it was confirmed that ink mist was blown up by the airflow. In addition, it was clarified that the airflow between a carriage and a paper varied depending on the carriage speed. Secondly, fundamental characteristics of ink droplets in the vicinity of ink jet nozzles were measured. The results reveal that PIV measurement is effective to gain an understanding of ink jet performance. Finally, airflow around ink jet nozzles was calculated numerically by Computational Fluid Dynamics (CFD). The results agree qualitatively with the experiments. Valuable design information to reduce mist contamination was obtained by the investigation.
Nobuyuki Hirooka, Yoshihiko Ono, Kazuhiro Mori, Nobuyuki Nakayama, "PIV Measurements of Airflow and Ink Mist Motion around Ink Jet Nozzles" in Proc. IS&T Int'l Conf. on Digital Printing Technologies (NIP19), 2003, pp 284 - 289, https://doi.org/10.2352/ISSN.2169-4451.2003.19.1.art00069_1