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Fluid for Conditioning Nozzle in Start Stop Printing

IP.com Disclosure Number: IPCOM000086375D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Gardineer, BA: AUTHOR [+3]

Abstract

In start-shutdown ink jet printing operations it is essential to insure that the inner and outer nozzle surfaces remain unchanged for very long periods of time, that no crust or solid particles will form from ink drying or air contamination and that, giving these two conditions, no changes in aim occur in start-stop cycles.

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Fluid for Conditioning Nozzle in Start Stop Printing

In start-shutdown ink jet printing operations it is essential to insure that the inner and outer nozzle surfaces remain unchanged for very long periods of time, that no crust or solid particles will form from ink drying or air contamination and that, giving these two conditions, no changes in aim occur in start-stop cycles.

In the operation of the jet, ink droplets, or mist particles, or paper dust or other air impurities can be drawn towards the nozzle orifice by air currents, attached to the nozzle surface and eventually produce aim changes. This, together with ink drying may be the most critical cause for jet aim failure.

A washing fluid is described that can be used in start-stop operations to flush the inside of nozzle, or to continuously rinse the outside nozzle surface once the stream has stopped. The washing fluid has the following properties: a) Compatible with the magnetic ink in all mixing proportions, without producing chemical reactions or precipitation of solid particles (Fe(3)O(4)) upon contact with the ink. b) This aqueous fluid has a similar composition regarding the bulk ink liquid phase. It does not contain solid particles, but it does contain a dilute solution of surfactants that preserves the colloidal stability of the ink. c) It has a very low evaporation rate (slow drying on surfaces). Therefore, the fluid will also act as a solvent of surfactant films or other residues left behind by the...