Thicker Copper Board
Generally, printed circuit board copper thickness more than 3oz are called Heavy Copper Board. Its thicker copper can conduct higher current and achieve better heat distribution. So, it is widely used in power electronic equipment, power supply system and new energy fields, such as electric vehicles, voltmeters, and other emerging industries.
Electrostatic Spraying technology advantage
The biggest difficulty in the production of thick copper sheet lies in the process of solder mask. The traditional screen printing process will make the thickness of solder mask uneven, poor coverage, bubble, soldering fold, line corner oil accumulation, line edge exposure, and other appearance problems. This leads to lines not being protected with the best coverage. Let's look at the diagram below for the analysis of traditional screen printing process: (it can be seen that at the two corners of the line, B, the solder mask is very thin)
Our factory uses the electrostatic spraying equipment imported from Japan, so there will be no such problem in the process of soldering. The working principle of the equipment is to spray soldering ink on the board in a dust-free vacuum environment. The schematic diagram is as follows:
PCB manufacturing process
Compared with traditional soldering technology, no matter from the aspect of appearance, coverage (uniformity), adhesion force, surface hardness, electrical performance, resistance to hydrolysis attack, or from the perspective of industry acceptance standard IPC SM840, electrostatic spraying technology is undoubtedly the most advanced and perfect soldering process, which can maximize the quality of products
With the help of this equipment, our company can produce circuit boards with the outer copper thickness less than 20 oz and the inner copper thickness less than 7oz. If you have specific product requirements, please feel free to contact us via firstname.lastname@example.org or Visit our online ordering system: