Rethinking Jettable Fluids, or Novel Dynamic Volume Control in Jetting of Complex Fluids

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Abstract:

The delivery of precise fluid volumes utilizing inkjet-like drop on-demand jetting technology is primarily controlled by the piezo voltage that actuates the jetting chamber. The jetting of large volumes, in excess of 1 nL, of complex highly viscous fluids is complicated by the difficulty of filling the ejection chamber quickly after the previous droplet ejection. In order to ensure the delivery of fluid to the ejection chamber, a mechanism utilizing a helical viscous pump has been introduced and implemented by the authors. The ejection mechanism consists of a piezo actuated piston that drives the fluid in the chamber through the nozzle on to the intended surface. The ejected volume of fluid has been studied with respect to piezo voltage, Vp, pulse time, tp, of the piezo signal and the angular speed of the helical viscous pump. It has been shown in the experimental jetting setup that the volume of a jetted deposit is only affected to a minor degree by the chosen piezo voltage, Vp, acting on the piston. Through imaging experiments, it has been shown that the speed of the ejected droplet has a nearly linear response to the piezo voltage, Vp.

Document Type: Research Article

Publication date: January 1, 2010

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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