What is the difference between printing ink on shenzhen flexible circuit board

Oil ink of flexible circuit board is mainly divided into three types: resistance welding, three lines and character ink.  

Ink plays a role in the production of copper foil protection, so that the copper skin is not exposed, will affect the following process, sensitive ink, carbon oil, silver oil, and carbon oil and silver oil have conductivity to do, usually used ink color, white oil, green oil, black oil, blue oil, red oil, butter.  

What is the difference between printing inks on flexible circuit boards  

Flexible circuit board printing ink (white oil) printing, protective oil printing (black oil), welding dry film printing (green oil)  

White oil: mostly printed text and symbols on flexible circuit boards, such as secondary tubes, etc.  

Back oil: used for large area on the surface of flexible circuit board to strengthen the ring strength of flexible circuit board.  (Also used to keep a part secret)  

Green oil: used for solder joints with insulating effect, generally used on flexible circuit boards without adhesive protection.