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Electrostatic Spraying Technology Used in Thick-Copper PCB

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Sat, Mar 23, 2019

Thicker Copper Board

Generally, printed circuit board copper thickness of more than 3oz is 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. One technology is indispensably used for the production of the thick-sopper PCB, and this technology is called "electrostatic spraying technology".

Electrostatic Spraying Technology

The biggest difficulty in the production of thick copper sheets lies in the process of a solder mask. The traditional screen printing process will make the thickness of the 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 the traditional screen printing process: (it can be seen that at the two corners of line, B, the solder mask is very thin)

pcb prototype

The PCB factory of PCBONLINE 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:

how pcb is made in china

Heavy Copper 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.

pcb prototyping china

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  info@pcbonline.com or visit our online ordering system:

https://sys.pcbonline.com/instant-quote/