B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
B41M 5/20 (2006.01) B41C 1/10 (2006.01) B41J 2/525 (2006.01)
Patent
CA 2282188
An image is reproduced and transferred onto a substrate by (a) providing a positive electrode having a continuous passivated surface moving at substantially constant speed along a predetermined path, said 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 containing 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. Step (b) is carried out by (i) 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, the first and second series of negative electrodes being arranged in spaced-apart parallel relationship with the negative electrodes of each series being spaced from one another by a distance at least equal to the respective electrode gap; (ii) coating the positive electrode active surface with an olefinic substance to form on the surface micro-droplets of olefinic substance; (iii) filling the electrode gaps with the electrocoagulation printing ink; (iv) 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 an undesirable formation of a gelatinous deposit on the electrode active surface of each energized electrode of the second series and the electrodes of the second series are energized prior to an undesirable formation of a further gelatinous deposit on the electrode active surface of each energized electrode of the first series, thereby causing point-by-point selective coagulation and adherence of the colloid onto the olefin-coated positive electrode active surface opposite the electrode active surfaces of the energized negative electrodes while the positive electrode active surface is moving; and (v) removing any remaining non- coagulated colloid from the positive electrode active surface.
Elcorsy Technology Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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