PCB News - Why can't the PCB circuit board be touched directly with your fingers

Why can't the PCB circuit board be touched directly with your fingers

Why can't the PCB circuit board be touched directly with my fingers? What are the serious consequences if you touch the circuit board directly with your hands? In fact, it will cause the bad scrap of the PCB circuit board and reduce the reliability of the end user. However, it is inevitable to touch the PCB circuit board with your hands directly during the work process. Therefore, it is necessary to develop the habit of wearing gloves, which can reduce the direct contact with the PCB circuit board. harm. The following Shenzhen Electronics Editor will take everyone to understand the causes, hazards, and how to avoid fingerprints that can lead to bad PCB circuit boards.

1. Fingerprints: Fingerprints are sweat stains on hands. Its main components are water, inorganic salts, fats and oils, and various pollutants such as cosmetics and skin care products.

2. The hazards of fingerprints in the PCB manufacturing process:

A. Touching the board with bare hands before the solder mask will cause the solder mask to fall, resulting in poor adhesion of the green oil, and blistering and falling off during hot air leveling;

B. During the process from the solder mask to the packaging of the gold circuit board, touching the surface of the circuit board with bare hands will cause the surface of the circuit board to be unclean, resulting in poor solderability or poor bonding;

C, the bare object touches the circuit board in a very short time to cause a chemical reaction of the copper on the board surface, resulting in oxidation of the copper surface. After a longer time, obvious fingerprints will appear after electroplating, and the uneven coating will cause serious defects in the appearance of the product;

d. The surface of the wet film or silk-printed circuit and the board before lamination has fingerprint grease, which can easily cause the adhesion of the dry/wet film to decrease, and cause the penetration and separation of the plating during electroplating, and the gold plate is easy to cause the board surface The pattern will oxidize the surface of the board after the solder mask is completed, and the color of yin and yang will appear.

If the above phenomena are not eliminated, it will damage the qualification rate and one-time pass rate of the product, which will cause a long production and processing cycle, a high rework rate, and a low on-time delivery rate.

3, PCB circuit board eliminates bare hands touching the board

A. Please carry special gloves and finger cots;

B. To develop a good habit of picking and placing boards;

C. Be sure to wear gloves (such as cloth gloves, rubber gloves, finger cots, etc.) in the process where gloves can be worn.

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