Drying of Complex Fluid Drops by David Brutin;Khellil Sefiane;

Author:David Brutin;Khellil Sefiane; [Неизв.]
Language: eng
Format: epub
ISBN: 9781839161209
Publisher: Ingram Publisher Services UK
Published: 2022-05-05T21:00:00+00:00

7.4 Summary

Ink printing is one of the best established drop-on-demand additive manufacturing methods and is particularly used in the microelectronic printing process, especially for tough surfaces, in addition to other application areas such as printing on porous surfaces and biomedical-related printing. Since drop-on-demand printing is a continuous process, the generated droplet and relevant drying period on the printed surface are crucial parameters for the reliability of the method. Following these critical considerations, this chapter evaluated droplet generation, printing process, and droplet drying phenomena of the ink and microelectronic printing applications via theoretical modeling and useful applications. At first, droplet generation mechanisms were defined with the hydrodynamic and rheological parameters that were presented via the Reynolds, Weber, and Ohnesorge numbers. Thanks to these numbers, the printable droplet generation region was defined for a general-purpose use. Secondly, the critical considerations on the printing surfaces were discussed from the standpoints of droplet splashing, droplet spacing, droplet diameter in equilibrium condition, and contact line pinning. The main aim was given as continuous printing on a linear pathway without any droplet instabilities. Then, to better understand the droplet drying behavior, we focused on the single droplet and investigated the coffee-ring effect and potential dealing mechanisms such as the Marangoni flow. After theoretical modeling details, the general trends in the ink and microelectronic printing applications were summarized, and the impact of process parameters (droplet parameters, surface specifications, and ambient conditions) was discussed. In addition, specific applications of ink and microelectronic printing like metal additive manufacturing, printing on a porous surface, or biomedical purposes were mentioned. Lastly, the system-scale drying processes of ink and microelectronic printing were presented with their pros and cons.

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