How to control the triangular scratches of electroplating and dry film in PCB printing industry, and what is the key point?

Triangular scratches are exposed substrate scratches caused by pcb corners hitting the board surface.

There are two main control points:

First of all, pcb must be rounded after cutting to avoid scratching the board at the right angle in the production process;

Secondly, when electroplating chajia, a plate should be electroplated in a tank, and the film should be separated during transportation to avoid scratches between plates.