Abstract
Inkjet printers are being developed to enable printing on surfaces other than paper, such as building walls, the ground, and clothes. The challenge for printers that print on surfaces other than paper is the formation of a liquid film after the ink has landed on the surface. On uneven surfaces other than paper, the droplets are affected by gravity and their shape is distorted, resulting in a reduction in image quality. To improve these problems, it is necessary to understand how high viscosity ink used in printing spread on the substrate. In this paper, it is examined whether the droplet motion model based on Newton’s second law of motion can explain the motion of highly viscous droplets. The results show that it is necessary to consider models that take into account changes in droplet shape and velocity over time and dynamic changes when the Reynolds number is large, and to establish a method for estimating Boc when the receding contact angle does not move.
