"Substrate" PCB manufacturing process of a glass epoxy resin (Glass Epoxy) or similar material is made to start.
Image (forming / wire production)
The first step is to establish the production of wiring connections between components. Current use of negative film transfer method will work on the performance of metal conductors. This technique is the entire surface covered with a thin layer of copper, and to remove some of the excess. Additional transfer type is another way to use the less, it is only where needed with copper method.
If making a double-sided, so both sides of the PCB substrate are covered with foil, if making a multilayer, the next step will be to these boards stuck together.
Positive photoresist (positive photoresist) is made of a photosensitive agent, it will dissolve in the light (if it is a negative photoresist through the illumination will not decompose). There are many ways to deal with the copper surface resist, but the most common way is to heat it, and rolling on the surface containing the photoresist (called dry film photoresist). It can also be used in the top spray mode liquid, but the dry film to provide a relatively high resolution, can produce a relatively thin wire.
Hood is only a template layer PCB manufacturing. In the PCB after the photoresist before exposure to UV light, a hood covering the upper portion of the photoresist can be prevented from being exposed area (assuming positive photoresist is used). The place is covered with photoresist, will become wiring.
After developing the photoresist to etch the other bare copper parts. Etching process can etch the board dipped in solvent or solvent sprayed on the board.
Solvents are generally used as an etching, ferric chloride (Ferric Chloride), basic amino (Alkaline Ammonia), sulfuric acid is added hydrogen peroxide (Sulfuric Acid + Hydrogen Peroxide), and copper (Cupric Chloride) chloride and the like.
After the end of the etching to remove the remaining photoresist. This is known as stripping (Stripping) program.
The following pictures can be seen how the copper wiring.
