1.  PCB copper-clad plate in the warehouse before IQC must carry out spot checks, check whether the PCB surface scratches the substrate phenomenon, if there should be timely contact with the

supplier, according to the actual situation, make appropriate treatment.

2.  PCB is scratched in the opening process, the main reason is that there are hard objects on the surface of the opening

machine, and the friction between the copper clad plate and the objects forms the phenomenon of copper foil scratches exposing the substrate, so it is necessary to carefully clean the table before

opening the material to ensure that the table lubrication is not hard hard objects.

3.  the plate is scratched in the process of turning:

① The amount of PCB circuit board lifted by the transfer personnel is too much and the component is too large, and the board is not lifted when it is transferred, but dragged along with the trend,

which constitutes the conflict between the PCB board Angle and the board surface and scratches the board surface; When the board is put down, it is forced to push the board in order to rearrange it,

and the friction between the board and the board is scratched；

4.  after copper sinking, the whole plate after gold-plated stacking board due to improper operation was scratched.

5.  the production plate is scratched in the horizontal machine:

① The baffle of the grinding machine sometimes contacts the surface of the PCB board, the edge of the baffle is generally uneven and the advantages are raised, and the surface of the board is

scratched when the board is passed;

② Stainless steel drive shaft, due to damage into sharp objects, over the plate scratch the copper surface and exposed the base material.