One of the initial stages in the copper foil production process involves dissolving high-grade (recycled) copper in Sulfuric Acid (H2S04)(1). The solution is then pumped through filters to produce the desired copper electrolyte solution and remove impurities. The final stage is a storage tank, where the solution is kept before it is fed into the actual plating process to create copper foil(2).
A critical measurement in the production process of copper foil is monitoring both concentrations (Cu + H2SO4) in a recirculated bypass on the side of the storage tank. When the solution meets all chemical and quality standards, it is pumped into large plating tanks containing partially immersed titanium drums to create a thin film of very pure copper. These tanks are also known as electroplating (ED) machines(3).
The Rhosonics CCM 9580 chemical concentration meter
The Rhosonics model CCM 9580 analyzer accurately monitors the solution of dissolved Copper and Sulfuric Acid (H2SO4 & Cu++). Measurement in copper-foil is done before the electroplating process. This model uses two sensors (ultrasonic & conductivity) to measure both concentrations in real-time. This is done in the bypass of the storage tank. The analyzer uses a predefined polynomial to calculate both concentrations (see the calibration matrix below). Besides continuous information about the two concentrations, the Rhosonics CCM 9580 also provides a real-time temperature reading.
In this way, the Rhosonics CCM 9580 model helps the client to maintain the desired concentrations to meet the quality standards for efficient copper foil production.