开云·kaiyun官方网站 factory: What is the residual copper rate of 开云·kaiyun官方网站 board?

开云·kaiyun官方网站 factory: What is the residual copper rate of 开云·kaiyun官方网站 board?

开云·kaiyun官方网站 manufacturers, 开云·kaiyun官方网站 designers, and 开云·kaiyun官方网站A manufacturers will explain to you what 开云·kaiyun官方网站 manufacturers are: what is the residual copper rate of 开云·kaiyun官方网站 boards?

开云·kaiyun官方网站 factories can never avoid touching a word - 开云·kaiyun官方网站 residual copper rate. However, some children are confused about this concept. Today, I will thoroughly explain to you what is the residual copper rate of 开云·kaiyun官方网站!

The concept of residual copper rate of 开云·kaiyun官方网站: The manufacturing process of 开云·kaiyun官方网站 starts from the 开云·kaiyun官方网站 "substrate" made of glass epoxy resin or SIMilar materials. The first step of production is to draw 开云·kaiyun官方网站 design wiring online between parts. The method is to "print" the circuit negative pole of the designed 开云·kaiyun官方网站 on the metal conductor through negative film transfer.

This technique is to lay a thin layer of copper foil on the entire surface and eliminate the excess. If double-sided board is made, copper foil will be laid on both sides of 开云·kaiyun官方网站 substrate. To make multilayer boards, you can "press" two double-sided boards with a special adhesive.

Next, you can drill holes and electroplate the components on the 开云·kaiyun官方网站 board. After drilling by machines and equipment according to the drilling requirements, the inside of the hole wall must be plated (Plated - Through Hole Technology, PTH). After metal treatment inside the hole wall, the internal circuits can be connected with each other.

Before electroplating, the sundries in the hole must be removed. This is because the epoxy resin will produce some chEMIcal changes after heating, and it will cover the internal 开云·kaiyun官方网站 layer, so it should be cleaned first. Cleaning and electroplating will be completed in the chemICal process. Next, 开云·kaiyun官方网站 manufacturers need to cover the solder mask (solder mask ink) on the outermost 开云·kaiyun官方网站 design wiring, so that 开云·kaiyun官方网站 design wiring will not touch the electroplating part.

Then, various components are screen printed on the circuit board to MARK the position of each component. It cannot cover any 开云·kaiyun官方网站 design wiring or gold finger, otherwise it may reduce the solderability or the stability of current connection. In addition, if there are metal connection parts, the "golden finger" parts are usually gold-plated, so that high-quality current connection can be ensured when inserting the expansion slot. The last is testing. The 开云·kaiyun官方网站 factory will test whether there is short circuit or open circuit in the 开云·kaiyun官方网站, which can be tested optically or electronically. Optical scanning is used to detect defects in each layer, while electronic testing typically uses flying pins to check all connections. Electronic tests are more accurate in detecting short or open circuits, but optical tests can more easily detect incorrect gaps between conductors.

After the completion of the circuit board substrate, the finished motherboard will assemble various sized components on the 开云·kaiyun官方网站 substrate as required - first, use the SMT automatic placement machine to "solder" IC chips and chip components, and then manually insert some tasks that cannot be completed by the machine. These plug-in components are firmly fixed on the 开云·kaiyun官方网站 through the wave crest/reflow soldering process to produce the motherboard. 开云·kaiyun官方网站 manufacturers, 开云·kaiyun官方网站 designers, and 开云·kaiyun官方网站A manufacturers will explain to you what 开云·kaiyun官方网站 manufacturers are: what is the residual copper rate of 开云·kaiyun官方网站 boards?