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Magnetic Coil Droplet Sensitizer for Electrostatic Droplet Deflection

IP.com Disclosure Number: IPCOM000079637D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Findlay, HT: AUTHOR [+2]

Abstract

The relationship of progressive dilution of ferromagnetic fluids and change, if any, in magnetic properties has been studied. For example, of six (6) samples varying in dilution from 100% t0 5% there is, as expected, a corresponding reduction in relative magnetic permeability. Relatively poor deflection of ferromagnetic fluids is customary, in comparison to fluids in a static charged drop deflection system. Tests show that drop deflection does not drop off in proportion to dilution and is significant in spite of a large drop off in relative permeability. Thus the magnetic property alone is not the sole cause for this unexpected phenomenon.

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Magnetic Coil Droplet Sensitizer for Electrostatic Droplet Deflection

The relationship of progressive dilution of ferromagnetic fluids and change, if any, in magnetic properties has been studied. For example, of six (6) samples varying in dilution from 100% t0 5% there is, as expected, a corresponding reduction in relative magnetic permeability. Relatively poor deflection of ferromagnetic fluids is customary, in comparison to fluids in a static charged drop deflection system. Tests show that drop deflection does not drop off in proportion to dilution and is significant in spite of a large drop off in relative permeability. Thus the magnetic property alone is not the sole cause for this unexpected phenomenon.

Deflection of droplets in an ink jet stream is obtained solely with a magnetic coil, rather than by a static charge imparted by a charge electrode. The electrostatic deflection plates are at zero voltage. A suitable fluid is colloidal magnetite in an aqueous media prepared by precipitation from ferric to ferrous salts. Droplet deflection is obtained, although relative magnetic permeability is close to zero. Conductive solutions (ionic salts) and conductive ink (SKRIP* 632) also deflect equally as well in the same magnetic field.

A nonconductive ink prepared from a petroleum hydrocarbon and dissolved dyestuff for testing in the same configuration does not deflect. Thus, ink conductivity has a positive effect on droplet deflection when passed through a magnetic f...