Why is the surface of aluminum copper clad laminate printed and brushed treated?
The grinding brush before the circuit is used to remove the oxide from the surface and improve the bonding force between the copper surface and the photosensitive film.
The function of the grinding plate before welding is similar, and it also improves the bonding force between the solder joint and the copper surface.
Not only the aluminum substrate but also the copper clad laminate of the ordinary FR-4 substrate are also treated by grinding and brushing during the production process.
