Image forming/wire production

Made the first step is to create online wiring between components. We use the negative transfer (Subtractive transfer) mode will work film performance on the metal conductor. This technique is the entire surface is covered with a thin layer of copper foil, and put the spare part to eliminate. Additional type transfer (i.e. the Pattern transfer) is another less people use way, it is only where the need to apply the method of copper wire, but we are not here to talk about.
If is made of double panel, will be spread on both sides of the PCB substrate, copper foil, if the production is a multilayer, the next step will be to the board to stick together.

Positive photo resist, photo resist) is made of sensitizer, it will dissolve under illumination (negative photo resist is if without lighting will decomposition).There are many ways to deal with the photo resist on the surface of the copper, but the most common way, it is heated, and contains the photo resist on the surface of the rolling (called dry film photo resist).It can also use liquid spray at the top, but dry film type provides high resolution, can also create more fine wires.

Hood is just a manufacturing PCB layer in the template. On the PCB board before the photo resist through UV light exposure, hood can prevent part of the cover in the above areas of the photo resist exposure not (assuming that USES the positive photo resist).These are covered with the photo resist, would be "wiring".

After the photo resist is developed, to etch the other bare copper parts. Board can be dipped into the etching solvent etching process, or spray the solvent on the board. Commonly used as a solvent etching, Ferric Chloride, Ferric Chloride), Alkaline Ammonia (Alkaline Ammonia), Sulfuric Acid and Hydrogen Peroxide, Sulfuric Acid + Hydrogen Peroxide), and copper Chloride (Cupric Chloride) by oxidation reaction such as its oxidation (such as Cu fecl2 fecl3 = CuCl2 + 2 + 2).After the etching will be to get rid of the rest of the photoresist.This is called to take off the membrane (Stripping) program.