Digital Printing

By:Rehan Khan

DIGITAL INKJET PRINTING MACHINE

HISTORY Now-a-days We have been stuck to digital technology especially in

our homes, Offices, Educational institutes where Mobiles, Telephone, Radio, T.V, Cameras and Computers are being used.

Digital technology not only blessed us at home but also in the industries particularly In TEXTILE PRINTING.

1987 (1m/min) acceptable technology Machine manufacturer and ink manufacturer and electronically aware

people jointly worked 2003 (1.5 m/min) by Reggiani Earliest used was carpet printing due to small motifs (10-25 DPI)

PAINConventional Printing caused More power More energy More labor More waste water Environment is polluted Limited Design Limited colors More downtime

INTRODUCTION

Digital printing is a non-contact printing technology in which fine ink droplets are formed and then deposited on a fabric

Ink jets are connected with CAD software helps in wide format designs by using suitable inks with acceptable quality and fastness.

It is the process of achieving desired designs by projecting tiny drops inks in predetermined Pixels on surface of the fabric.

It can design any kind of fabric Cotton, Polyester and Wool, Silk and Nylon

In past, machine is operated by mechanical methods, operator experience and judgment and then it is advanced by electromechanical feedback device.

It was made fully electronically.

PROCESS During the printing process, the fabric is fed through the printer using

feed roller and ink is applied to surface of fabric in the form of thousand tiny droplets.

fabric is printed by digital printers with the design prepared on computer using ink jet based method of printing colorants onto fabric.

The fabric is then passed through steam/heat chamber to cure the ink.

Then steamed fabric required washing and drying

Types and working Principle1.Charged Drop Printer It was invented in 1987 having four Heads having speed

1m2/hour Ink is highly forced through a hole of 8-15 microns It’s principle is called Binary charge system This machine had a problem of controlling droplets with

electrostatics and aerodynamics with neighbor droplets affects velocity and path of fabric surface

As we increase the JETS, Color combination and handling would be difficult

2.Drop on Demand printer It works on the principle of electromechanical signal

to a printing ink Its signals provides impulse piezo current to give

channel to jet to produce ink from jets. There are two mechanism of ejection 1.Tube type 2.Bubble jet

Ink Requirements Stability at storage Should not affect print head Viscosity would be 3-10Mpa Sec. For Piezo head Viscosity would be 15-30 Mpa Sec. Water soluble without electrolyte Non Foaming character.

Inks manufacturer

Thank You!