Year: 2021

We often see large and small holes on circuit boards. Holes can be roughly divided into PTH (Plating Through Hole) and NPTH (Non Plating Through Hole). “It’s because this kind of hole really penetrates from one side of the circuit board to the other. In fact, in addition to the through holes in the circuit …

Etching machines can be divided into chemical etching machines and electrolytic etching machines. In chemical etching, a chemical solution is used to achieve the purpose of etching through a chemical reaction. A chemical etching machine is a technology that removes materials by chemical reaction or physical impact. Automatic etching machine: The automatic chemical etching machine …

PCB circuit board tin spraying, also called hot air leveling, is an important process in the production of PCB circuit boards. The surface treatment of PCB circuit boards can be divided into two types: lead and lead-free: Lead HAL The so-called lead-sprayed tin refers to the tin in a certain proportion, and the lead will …

The developer of the water-soluble dry film is a 1-2% anhydrous sodium carbonate solution with a liquid temperature of 30-40°C. The development mechanism is that the active groups in the unexposed part of the photosensitive film react with the dilute alkali solution to generate soluble substances and dissolve. During development, the active group carboxyl-COOH interacts …

The difference between electroless gold plating and electroplating gold (electroless gold plating is also called immersion gold; gold plating usually refers to electroplating gold). 1.The difference in principle FLASH GOLD (electroless gold plating) uses the method of chemical deposition! PLANTING GOLD uses the principle of electrolysis! 2.The difference in appearance Electroplating gold has electro-gold leads, …

With the development of the PCB industry, the impedance requirements of various wires have become higher and higher, which inevitably requires more stringent control of the width of the wires. In order to enable the engineering management personnel of Rongxin Company, especially the process engineering personnel responsible for the etching process, to have a certain …