At the start of the 1950s, with the appearance of transistors in both the Soviet Union and abroad, there was rapid development of copper foil production for printed circuits. Foil production for printed circuits involved two basic operations: production of copper strip - the so-called "raw" foil - and treating the foil surface to give it the required properties. The method used during those years o producing copper foil from sulfate electrolytes in rotary electrolyzers with a stainless steel cathode and soluble anodes - still do not meet foil quality requirements. By the 1970s all the leading foreign firms ("White Industries", Gould (USA), etc.) had switched to producing foil by a more progressive technology - using electrolyzers with insoluble anodes. This method'makes it possible to stabilize technological parameters during the production process, to intensify the process, and simplifies industrial conversion to automated control.
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