Design of Piezo Inkjet Print Heads. From Acoustics to Applications

  • ID: 4398466
  • Book
  • 466 Pages
  • John Wiley and Sons Ltd
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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.
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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
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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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