B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
204/2, 314/42
B41M 5/20 (2006.01) B41C 1/10 (2006.01)
Patent
CA 1279603
MONOCHROMIC AND POLYCHROMIC PRINTING OF AN IMAGE REPRODUCED BY ELECTRO- COAGULATION OF A COLLOID Abstract of the Disclosure A method and apparatus for reproducing an image and transferring same onto an end-use support. A positive electrolytically inert electrode is provided in the form of an endless elongated belt moving at sub- stantially constant speed along a closed horizontal path and having an electrode active surface extending vertically. A plurality of negative electrolytically inert electrodes which are electrically insulated from one another are arranged side-by-side in rectilinear alignment to define a series of corresponding electrode active surfaces disposed transversely of the belt and spaced from the positive electrode active surface there- of by a constant predetermined electrode gap. The electrode gap is filled with a substantially liquid colloidal dispersion containing an electrolytically coagulable colloid, a liquid dispersing medium and a soluble electrolyte and having a substantially constant temperature. Selected ones of the negative electrodes are electrically energized to cause point-by-point selective coagulation and adherence of the colloid onto the positive electrode active surface of the belt oppo- site the electrode active surface of the energized negative electrodes while the belt is moving, thereby forming a series of corresponding dots of coagulated colloid representative of a desired image. Any remaining non-coagulated colloid is then removed from the positive electrode active surface. The colloid is treated either before or after the coagulation thereof with a coloring agent to obtain dots of colored, coagulated col- loid which are thereafter contacted with an end-use support to cause transfer of the coloring agent onto the end-use support and thereby imprinting of the end-use support with the image.
502345
Investissements Castegnier Inc./castegnier Holdings Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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