Chemistry: electrical and wave energy – Processes and products – Electrophoresis or electro-osmosis processes and electrolyte...
Patent
1999-10-29
2000-04-04
Mayekar, Kishor
Chemistry: electrical and wave energy
Processes and products
Electrophoresis or electro-osmosis processes and electrolyte...
204483, 204508, 204623, 101DIG29, C25D 1304
Patent
active
060456744
ABSTRACT:
An image is reproduced and transferred onto a substrate by (a) providing a positive electrode having a continuous passivated surface moving at constant speed and defining a positive electrode active surface; (b) forming on the positive electrode active surface a plurality of dots of colored, coagulated colloid representative of a desired image, by electrocoagulation of a colloid present in an electrocoagulation printing ink containing a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image. Step (b) is carried out by providing a first and a second series of negative electrodes each having a surface covered with a passive oxide film, the negative electrodes of each series being electrically insulated from one another and arranged in rectilinear alignment so that the surfaces thereof define a plurality of corresponding negative electrode active surfaces disposed in a respective plane spaced from the positive electrode active surface by a respective constant predetermined gap; coating the positive electrode active surface with an olefinic substance; filling the electrode gaps with the electrocoagulation printing ink; and electrically energizing selected ones of the negative electrodes of the first and second series in a controlled alternate manner such that the electrodes of the first series are energized prior to formation of a gelatinous deposit on the surface of each energized electrode of the second series and the electrodes of the second series are energized prior to formation of a further gelatinous deposit on the surface of each energized electrode of the first series.
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patent: 5538601 (1996-07-01), Castegnier
patent: 5750593 (1998-05-01), Castegnier et al.
patent: 5908541 (1999-06-01), Castegnier
Elcorsy Technology Inc.
Mayekar Kishor
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