Differences in manufacturing methods:
- Calendering copper refers to pasting high-purity copper onto FPC by rolling. Because FPC and copper foil have excellent adhesion, copper foil has high adhesion strength and working temperature, and can be dipped welded in 260 ℃ molten tin without foaming.
- Electrolytic copper has been learned in junior high school chemistry. CuSO4 electrolyte can continuously produce layers of “copper foil”, which is easy to control the thickness. The thicker the copper foil is, the more time it takes! According to Cabol Technology, FPC plants usually have strict requirements on the thickness of copper foil, which is generally between 0.3mil and 3mil. A special copper foil thickness tester is used to check its quality.
Differences in quality and use:
- As the name implies, electrolytic copper is formed by adsorbing copper ions on the substrate through electrolysis, so it is characterized by strong conductivity, but relatively weak bending resistance.
- The calendered copper is made of copper foil by extrusion. It is characterized by good bending resistance, but its conductivity is weaker than electrolytic copper. It is mainly used for cameras in flip phones. From the appearance, the electrolytic copper turns red and the calendered copper turns yellow.