Method for controlling etching of electrolytic capacitor foil

Details Method for controlling etching of electrolytic capacitor foil Method for controlling etching of electrolytic capacitor foil

C - Chemistry, Metallurgy

23

F

149/1

C23F 1/00 (2006.01) C25F 3/04 (2006.01) H01G 9/04 (2006.01)

Patent

CA 1146845

METHOD FOR CONTROLLING ETCHING OF ELECTROLYTIC CAPACITOR FOIL Abstract of the Disclosure In a process for etching aluminum foil, a wire coil is placed adjacent the foil as it exits the etch sta- tion. The voltage induced by eddy currents produced in the foil by the energized coil is sensed at the same coil or another coil. The foil drawing speed through the etch station is altered in response to that sensed voltage, or another process parameter is changed, so as to maintain at a constant value the ratio of the actual to apparent foil surface area.

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