How to avoid finger print on PCB?

How to avoid finger print on PCB?
As an important part of modern electronic equipment, PCB is an information carrier integrating various electronic components. It is widely used in the electronic field, and its quality can directly affect the performance of products. In traditional inspection, PCB boards are mostly inspected manually. In the inspection process of PCB manufacturers, it is inevitable that people directly touch PCB boards with their hands.
Shenzhen pcb board
What harm will it bring to directly touch PCB with hands? When touching PCB boards with hands, if special gloves are not worn, finger prints will be left, which will lead to defective scrapping of PCB boards and reduced reliability of end users. Disadvantages of finger print in PCB manufacturing process: 1. The bare hand touching the PCB before solder resistance will lead to solder resistance, resulting in poor adhesion of green oil, which will bubble and fall off during hot air leveling; 2. During the process from soldering resistance to packaging of the gilded circuit board, touching the circuit board surface with bare hands will lead to unclean circuit board surface, resulting in poor solderability or poor bonding; 3. When the bare object touches the circuit board, the copper on the board will undergo chemical reaction in a very short time, leading to copper oxidation. After a little long time, it will show obvious fingerprints after electroplating, and the uneven coating will cause serious defects in the product appearance; 4. The wet printing film or silk screen printing line and the board surface before pressing the film contain fingerprint grease, which is very easy to cause the adhesion of the dry/wet film to decline, lead to the penetration and coating separation during electroplating, and the gold plate is easy to cause the board pattern. After the completion of the solder mask production, the board surface will be oxidized to produce yin and yang colors.
Thick copperplate

If the above phenomena are not standardized, they can be eliminated, which will damage the qualified rate and one-time pass rate of products, resulting in long production and processing cycle, high rework and material supplement rate, and low on-time delivery rate, which will damage the image of the circuit board manufacturer in the customer's mind and affect the next cooperation. Fingerprint actually refers to the sweat stains on the hands, mainly water, inorganic salts and some greasy dirt. Therefore, the key for circuit board manufacturers to eliminate finger prints is how to eliminate bare hand contact boards: each employee is required to develop a good habit of taking and placing boards; Carry gloves and finger cots with you; Gloves must be worn in the process where gloves can be worn; The management sets an example, teaches by example, and builds an image. As a PCB manufacturer, the above are the hazards, causes and avoidance methods of the "finger print" shared by Honglian Circuit Xiaobian. We should do a good job in details and cultivate good working habits from top to bottom. This is "responsible, progressive, efficient and win-win", improve product yield and achieve win-win two-way choice for customers.
The above is the explanation given by the editor of pcb circuit board company. If you want to know more about PCBA, you can go to our company's home page to learn about it. In addition, our company also sells various circuit boards,
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