Developper – Pill
This equipment realizes the development of the photoresist. It removes the non-exposed photoresist by projecting a NaCO3 solution onto the film.
This installation operates electrolytically and allows the following operations:
- Metallization of holes by chemical preparation and electrolytic copper
- Copper deposit of about 20 µm on the tracks and in the holes
- Deposit of tin acting as a saving when etching
Stripping – Pill
Used to remove the resist covering the unwanted copper. This is done generally using soda or potash.
Etching – Pill
The copper parts which have not been protected by protective tin are now etch away. For this we use a powerful alkaline solution. This process is quite critical because we need to ensure that we do not etch tracks sideways so they are exactly as requested by the designer.