This work is focused on assessing the jetting performance of high viscosity fluids, by means of an innovative piezoelectric driven thin-film printhead, developed by ST Microelectronics. The tests are carried out at ambient temperature, with common model fluids like ethylene glycol and glycerine. After the initial characterization, ZnO nanoparticles suspension and Clevios PH1000 are tested, as an example of solutions with industrial interest. The normal range of viscosities, employed in drop-on-demand inkjet, is lower than 20cP. In this work, the 10-300cP range of viscosities is assessed. Two different piezoelectric (PZT) compositions and printhead designs are evaluated. The results are discussed highlighting the importance of each factor, namely the piezoelectric material, the design of the actuators and the effect of the fluid, with specific focus on the viscosity.
Questo lavoro è centrato sulla valutazione delle performance di un’innovativa testina di stampa inkjet, basata su tecnologia thin-film piezoelettrica, sviluppata da ST Microelectronics. In particolare, l’interesse è volto ai fluidi con alta viscosità, con jetting a temperatura ambiente. Il limite di viscosità degli inchiostri, comunemente usati nell’inkjet, è 20cP. In questo lavoro, il range di viscosità esplorato si estende fra i 10cP e i 300cP. I fluidi usati per la caratterizzazione sono glicole etilenico e glicerina, due soluzioni comunemente usate come liquidi modello. Nella seconda parte del lavoro, due fluidi con interesse industriale per le applicazioni, sono stati scelti e testati: una sospensione di nanoparticelle di ZnO e Clevios PH1000. Due materiali piezoelettrici PZT, aventi composizioni differenti, e due design di attuatori sono stati confrontati. I risultati sono presentati mettendo a luce l’importanza ed il valore di ciascun paramentro, e come influenza le performance finali, con particolare interesse centrato sulla viscosità.
Jetting characterization of high viscosity fluids by means of a piezoelectric driven printhead at ambient temperature
BROVELLI, STEFANO
2018/2019
Abstract
This work is focused on assessing the jetting performance of high viscosity fluids, by means of an innovative piezoelectric driven thin-film printhead, developed by ST Microelectronics. The tests are carried out at ambient temperature, with common model fluids like ethylene glycol and glycerine. After the initial characterization, ZnO nanoparticles suspension and Clevios PH1000 are tested, as an example of solutions with industrial interest. The normal range of viscosities, employed in drop-on-demand inkjet, is lower than 20cP. In this work, the 10-300cP range of viscosities is assessed. Two different piezoelectric (PZT) compositions and printhead designs are evaluated. The results are discussed highlighting the importance of each factor, namely the piezoelectric material, the design of the actuators and the effect of the fluid, with specific focus on the viscosity.File | Dimensione | Formato | |
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https://hdl.handle.net/10589/153802