Design of Piezo Inkjet Print HeadsFrom Acoustics to Applications
An integral overview of the theory and design of printheads, authored by an expert with over 30 years' experience in the field of inkjet printing. Clearly structured, the book presents the design of a printhead in a comprehensive and clear form, right from the start. To begin with, the working principle of piezo-driven drop-on-demand printheads in theory is discussed, building on the theory of mechanical vibrations and acoustics. Then the design of single-nozzle as well as multi-nozzle printheads is presented, including the importance of various parameters that need to be optimized, such as viscosity, surface tension and nozzle shape. Topics such as refilling the nozzle and the impact of the droplet on the surface are equally treated. The text concludes with a unique set of worked-out questions for training purposes as well as case studies and a look at what the future holds. An essential reference for beginning as well as experienced researchers, from ink developers to mechanical engineers, both in industry and academia.
INTRODUCTION SINGLE, TWO, THREE AND FIVE DEGREES OF FREEDOM Effect of Nozzle Shape Schematic of Fluidic and Acoustic System Surface Tension, Viscosity and Compressibility, Frequency Dependent Damping Piezo Theory Rayleigh's Method Pulse Shape Definition Non-Linear Effects Fluidic Cross-Talk Examples LONG WAVE GUIDE THEORY SINGLE & MULTI NOZZLE PRINT HEAD Wave Speed Governing Equations Solution Strategies Damping Complex Pulse Shapes, Multi Pulsing Examples DROPLET FORMATION Energy Consideration Influence of Meniscus Position on Droplet Speed and Size Influence of Droplet Formation on Dynamics of Fluid Motion Cooling of Free Flying Droplet Jetting of Viscoelastic Inks Examples REFILLING Surface Tension Driven Refilling Inertia Effects Start-up Effects Multi Pulsing & Gray Scaling Examples IMPACTING DROPLETS Viscosity and Surface Tension Dominated Spreading Inertia Dominated Spreading Splashing Examples PERMEATION AND DRYING Washburn Theory Drying of Liquid Droplets Examples CONCLUSIONS AND OUTLOOK
J. Frits Dijksman obtained his master's degree in mechanical engineering at the Technical University of Delft, The Netherlands, in 1973. He finished his PhD within the groups of Professor D. de Jong and Professor W.T. Koiter (Technical University of Delft, The Netherlands, 1978) focusing on the engineering mechanics of leaf spring mechanisms. He worked with Philips Research Laboratories in Eindhoven, The Netherlands, for more than 32 years. After his retirement he continued his work as part time professor at the University of Twente, The Netherlands. The topics include inkjet printing of viscoelastic inks, design of inkjet print heads and printed biosensors.
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