Method for preparing a support for a lithographic printing plate

Details Method for preparing a support for a lithographic printing plate Method for preparing a support for a lithographic printing plate

1980-05-30

1981-10-13

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412943, 204DIG9, C25F 304

Patent

active

042946727

ABSTRACT:
A method for preparing a support for a planographic printing plate using an electrolytic surface treatment of an aluminum plate is disclosed, wherein an alternating charge voltage is applied to the aluminum plate in an acidic electrolyzing bath, and the wave form representing the voltage includes an intermission of zero voltage in at least one of the anode or the cathode phases, and is such that the electric quantity for the anode phase is larger than the electric quantity for the cathode phase.

REFERENCES:
patent: 2930741 (1960-03-01), Burger et al.
patent: 3073765 (1963-01-01), Adams
patent: 3520788 (1970-07-01), Paehr
patent: 3887447 (1975-06-01), Sheasby et al.
patent: 4072589 (1978-02-01), Golda et al.
patent: 4087341 (1978-05-01), Takahashi et al.
patent: 4140599 (1979-02-01), Yamasaki et al.

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