Method and apparatus for electrolytic treatment

Details Method and apparatus for electrolytic treatment Method and apparatus for electrolytic treatment

1992-02-28

1993-06-22

Valentine, Donald R.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

20412943, 20412975, 204228, 204224M, C25F 304, C25F 700

Patent

active

052214427

ABSTRACT:
In a process of surface-roughening of an aluminum support for a printing plate using an AC electrolytic etching apparatus, changes of the current waveform, particularly changes of the time required for the current to reach its peak value due to variations of the load on the power supply are prevented. Also, the voltage load on the gate turn-off thyristors used for generating an alternating current is prevented from going beyond the withstanding voltage capacity of the thyristors. In accordance with the invention, an electrolytic surface-roughening treatment apparatus is provided in which an alternating current is supplied by a power supply having a circuit for generating the alternating current using a current inversion control circuit so as to perform electrochemical treatment, wherein the electrolytic surface-roughening treatment is performed with either a parallel circuit or a series circuit of a capacitor and a diode bridge inserted in parallel with the load on the power circuit.

REFERENCES:
patent: 3379955 (1968-04-01), Koetsch
patent: 4294672 (1981-10-01), Ohba et al.
patent: 4482434 (1984-11-01), Pliefke
patent: 4548683 (1985-10-01), Huang et al.
patent: 5082537 (1992-01-01), Stroszynski
patent: 5141605 (1992-08-01), Nishino et al.

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