Small fast inkdrop emission from a nozzle

Howison, S.D. and Ockendon, J.R. and Parker, D. (2002) Small fast inkdrop emission from a nozzle. European Study Group with Industry > 43rd ESGI [Lancaster 2/4/2002 - 5/4/2002].

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EPrint Type:	Study Group Report
Study Group:	European Study Group with Industry > 43rd ESGI [Lancaster 2/4/2002 - 5/4/2002]
Company Name:	Xaar plc
Industrial Sector:	None/Other
Additional Contributors:	Healy, J. and Hinch, E.J. and Ockendon, H. and Please, C.P. and Voyce, C.
ID Code:	16
Deposited By:	Gordon White
Deposited On:	10 June 2004

Problem Statement

In the normal operation of ink jet printheads, ink drops are extruded through a nozzle, producing plugs with the same diameter as the nozzle. However, Xaar has observed that under certain circumstances a smaller, faster drop is emitted from the centre of the nozzle, having about one quarter the diameter of the nozzle and about twice the velocity of normal operation. The Study Group was asked to consider possible mechanisms that could lead to this unusual behaviour. If the production of such microdrops can be understood, a practical design might be viable, so allowing printing with much higher resolution and with reduced ink usage.

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