High-speed electrocoagulation printing method and apparatus

Details High-speed electrocoagulation printing method and apparatus High-speed electrocoagulation printing method and apparatus

B - Operations, Transporting

41

M

204/2, 314/42

B41M 5/20 (2006.01) B41C 1/10 (2006.01)

Patent

CA 1334017

A method and apparatus for reproducing an image and transferring same onto a substrate. A positive cylindrical electrode is rotated about its longitudinal axis at a substantially constant speed, the positive electrode having a passivated surface defining a positive electrode active surface. A plurality of negative electrolytically inert electrodes electrically insulated from one another are arranged in rectilinear alignment to define a series of corresponding negative electrode active surfaces disposed in a plane parallel to the longitudinal axis of the positive electrode and spaced from the positive electrode active surface by a constant pre- determined gap, the negative electrodes being spaced from one anotner by a distance at least equal to the electrode gap to prevent edge corrosion of the negative electrodes. The positive electrode active surface is coated with an olefinic substance and a metal oxide to form thereon micro-droplets of olefinic substance containing the metal oxide in an amount to prevent corrosion of the positive electrode. The electrode gap is filled with a colloidal dispersion containing an electrolytically coagulable colloid. Selected ones of the negative electrodes are electrically energized to cause point-by-point selective coagulation and adherence of the colloid onto the olefin and metal oxide-coated positive electrode active surface, thereby forming a series of corresponding dots of colored, coagulated colloid representative of a desired image. The dots of colored, coagulated colloid are then contacted with a substrate to cause transfer of the colored, coagulated colloid onto the substrate and thereby imprint the substrate with the image.

596464

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