Analysis of formation of an individual droplet using a high-resolution multi-exposure imaging system
2013 (English)In: NIP29: Digital fabrication 2013, 29th international conference on digital printing technologies, September 29-October 3, 2013, Seattle, Washington : technical program and proceedings, The Society for Imaging Science and Technology, 2013, 354-358 p.Conference paper (Refereed)
Localized dispensing of precious functional materials has attracted considerable interest in the academic as well as the industrial society. While the number of publications show numerous fields of applications in printed electronics, photovoltaics, display technologies and thin functional coatings, the transition into the industrial sector is often hindered by challenges resulting from ink-printhead combinations and their implications on reliability and stability of the process, as well as side-effects such as mist accumulation in heavy duty printing equipment. While measuring equipment to quantify various rheological and interfacial parameters for fluid optimization has been developed with the accompanying mathematical models, the physical jetting experiment as well as high-duty printing trials cannot yet be substituted by these methods. In order to quantify the generation of a droplet alongside with its tailing behavior and mist formation as well as statistics based on cross-talk effects and relaxation-related effects, high-resolution and high-speed imaging are required. This paper examines the optical setup and outlines the required calculations for establishing sharp, high-resolution images using a combination of a high power laser diode with a resonant ME MS micro mirror with a theoretical resolution of 1.8 pm. The limitations of the setup regarding the achievable resolution as well as potential improvements are assessed. Furthermore, the experimental setup, including repetitive generation of nanosecond-pulses necessary for motion-blur-free images, will be discussed. Additionally, results from imaging a droplet formation process using a Xaar 126 printhead are discussed.
Place, publisher, year, edition, pages
The Society for Imaging Science and Technology, 2013. 354-358 p.
Display technologies, Droplet formation process, High resolution image, Individual droplets, Industrial societies, Measuring equipments, Printing equipments, Reliability and stability, Drops, Functional materials, High power lasers, Mathematical models, Optimization, Photovoltaic effects, Protective coatings, Image resolution
Engineering and Technology
IdentifiersURN: urn:nbn:se:kth:diva-146917ScopusID: 2-s2.0-84897728362ISBN: 978-089208306-0OAI: oai:DiVA.org:kth-146917DiVA: diva2:726628
29th International Conference on Digital Printing Technologies, NIP 2013 and Digital Fabrication 2013; Seattle, WA; United States; 29 September 2013 through 3 October 2013
QC 201406182014-06-182014-06-182014-06-18Bibliographically approved