B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
B41M 5/20 (2006.01)
Patent
CA 2194128
An improved electrocoagulation printing method comprising the steps of (a) providing a positive electrolytically inert electrode capable of releasing trivalent metal ions and having a continuous passivated surface moving at substantially constant speed along a predetermined path, the passivated surface 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 an electrolytically coagulable colloid present in an electrocoagulation printing ink comprising a liquid colloidal dispersion containing the electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte and a coloring agent; and (c) bringing a substrate into contact with the dots of colored, coagulated colloid to cause transfer of the colored, coagulated colloid from the positive electrode active surface onto the substrate and thereby imprint the substrate with the image. The improvement resides in maintaining the positive electrode active surface and the ink at a temperature of about 35°C to about 60°C to increase the conductivity of the ink and the release of trivalent metal ions from the passivated surface into the ink in step (b) so that the trivalent metal ions initiate coagulation of the electrolytically coagulable colloid and are released in a quantity sufficient to increase the optical density of the coagulated colloid, thereby increasing coagulation efficiency in step (b).
Elcorsy Technology Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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