잉크물성치 및 소재이송이 Single Pass 형 프린트헤드 성능에 미치는 영향

In high speed of single-pass type DTP(digital textile printing) system, the selection of ink and the influence of substrate motion are also known to the most important factors in inkjet printing performance. The printing quality such as the volume and velocity of main and satellite droplets is closely related to the above mentioned two factors. In the present work, we investigate the droplet behavior of a shear-mode piezoelectric actuators numerically. The transient three-dimensional conservation equations of mass and momentum are solved by the computational fluid dynamics. The continuous surface force model is used in order to predict the effect of surface tension force in the free surface flow. The volume-of-fluid method with the piecewise linear interface construction (PLIC) scheme is employed for tracking the interfacial movement and reconstructing the interface between ink and air. The interaction between the air flow induced by droplet drag and the couette flow entrained from the substrate movement is also investigated.