Method of electrolytically graining a lithographic plate

Details Method of electrolytically graining a lithographic plate Method of electrolytically graining a lithographic plate

1984-09-28

1985-10-22

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412975, 204DIG9, C25F 304

Patent

active

045486832

ABSTRACT:
A method is provided for electrolytically graining an aluminum lithographic plate to produce a grained surface with a honeycomb topography, non-directional grain structure, and a substantially reduced production of smut. The reduction of smut is achieved by utilizing an alternating current of higher frequencies, generally in the range of approximately 140 to 400 Hz.

REFERENCES:
patent: 4140599 (1979-02-01), Yamasaki et al.
patent: 4294672 (1981-10-01), Ohba et al.
patent: 4297184 (1981-10-01), Dyer
patent: 4396468 (1983-08-01), Walls
patent: 4455200 (1984-06-01), Okamoto
patent: 4468295 (1984-08-01), Pliefke

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