It is also called the inner imagine transferring in a clean room, it is to transfer the PCB circuit image by using an artwork film to the circuit board surface, using photosensitive dry-film and UV light, which will polymerise the dry film exposed by the artwork.
![](https://pcbweller.com/app/uploads/2020/11/PCB-inner-layer-imagine-process.png)
Weller:
The grade of clean room: 100 000;
The high quality of artwork film imported from Japan.
![](https://pcbweller.com/app/uploads/2020/11/PCB-inner-layer-imagine-process-machine-1.png)