The Inkjet Conference's video: TheIJC 2019: Aerodynamics of direct-to-shape printing

A highly-rated presentation from TheIJC - the world's biggest event dedicated to inkjet engineering and inkjet chemistry. Join us at the next conference on 27-28 October 2020 in Düsseldorf. Book now at http://theijc.com You can purchase all 2019 proceedings at http://www.esma.com/shop/theijc SUBSCRIBE TO THIS CHANNEL TO RECEIVE UPDATES ON THE NEXT PRESENTATION RELEASE Dr Maria Cristina Rodriguez Rivero from University of Cambridgh presents during The Inkjet Conference 2019 “Aerodynamics of direct-to-shape printing”. We have previously reported the role of entrained airflows on printing precision when a flat surface passes below an industrial printhead. Scaled-down to a laboratory setup with a macro-scale visualisation technique, we observed the importance of a range of printing conditions on drop behaviour and linked these conditions to common printing defects. The work presented here reports on new research into the developed airflows and examines the increasing importance of aerodynamic effects when printing direct-to-shape. Using a system based on laser visualisation and seeded airflows, we analyse the crossflow profile and drop interactions during the printing process and will show parametric analyses using laboratory scale single nozzle devices as well as commercial multiple nozzle devices. We have observed the development of airflows complex dynamics with boundary layer separation, drop wake interaction and eddy development. The detailed knowledge of the crossflow and drop wake behaviour will allow us to develop methods to either avoid some of these physical phenomena or compensate for printing defects when printing directly to shape. We have also studied ways to quantify printing defects by studying printed patterns in order to help in improving feedback control techniques. This work will help in the integration of new functionalities onto industrial products.