This process is crucial for the treatment of the outer layers of circuits, particularly for preparing copper surfaces. Copper surfaces are essential for conductivity in electronic circuits. Photoprinting on MDI machines allows for the creation of precise patterns on these copper surfaces, which are necessary for establishing connections between different parts of the circuit.

Additionally, this technology is used to produce photo solder masks. Photo solder masks are critical in photolithography, as they define the pattern that is subsequently transferred to the surface of the circuit. The accurately defined patterns and structures enabled by photo solder masks are vital for the proper functioning of electronic devices.