The Secret Ritual of Substrate Treatment
The journey of electroplating copper foil begins with the meticulous preparation of a titanium roller. This giant roller, nearly 3 meters in diameter, undergoes a three-step transformation: first, it is polished to a mirror finish with diamond polishing paste; then, microscopic impurities are removed through an acid-alkali combination solution; and finally, nanoscale cleaning is completed in an ultrasonic bath. The smoothness of the treated roller surface directly affects the surface quality of the copper foil, as crucial as the cleansing step before applying makeup.
The Chemical Symphony in the Electroplating Bath
When the titanium roller is immersed in a blue copper sulfate solution, the real magic begins. Here, triple precision control is employed:
Solution ratio: Copper ion concentration is maintained at 80-120 g/L; sulfuric acid content determines crystal fineness.
Temperature balance: A constant temperature environment of 50±2℃ ensures a stable deposition rate.
Current dance: When using pulsed current, alternating between 5A/dm² forward and 1A/dm² reverse currents forms a dense crystal structure.
The final sprint to product completion: The plated copper foil must pass three stages before leaving the factory:
Anti-oxidation treatment: A nano-protective film is formed in a chromate solution.
Drying and shaping: A hot air circulation system removes moisture using a gradient temperature increase method.
Intelligent slitting: A laser thickness gauge, combined with an air-floating blade holder, slits the copper foil into rolls with a precision of 0.5 mm.
