Speed electrocoagulation printing method and apparatus

Details Speed electrocoagulation printing method and apparatus Speed electrocoagulation printing method and apparatus

1989-04-24

1990-01-23

Tufariello, T. M.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

2041811, 204300EC, C25D 1304

Patent

active

048956295

ABSTRACT:
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 surface disposed in a plane parallel to the longitudinal axis of the positive electrode and spaced from the positive electrode active surface by a constant predetermined gap, the negative electrodes being spaced from one another 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 microdroplets 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.

REFERENCES:
patent: 3892645 (1975-07-01), Castegnier
patent: 4555320 (1985-11-01), Castegnier
patent: 4661222 (1987-04-01), Castegnier
patent: 4680097 (1987-07-01), Castegnier
patent: 4786385 (1988-11-01), Castegnier

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