What adverse effects can finger prints have on PCB circuit boards?Fr4 PCB Board Double Sided_Shenzhen StarLight Industrial Development Co., Ltd.

What adverse effects can finger prints have on PCB circuit boards?Fr4 PCB Board Double Sided

source:News release time:2023-08-25 Hits: Popular:PCB Assembly company: Share:

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　　As is well known, when making PCB circuit boards, it is inevitable to produce finger marks, which can cause quality problems on the circuit board. So, what adverse effects will finger prints have on PCB circuit boards?

　　Fingerprints are hand sweat stains, mainly composed of water, inorganic salts (such as NaCl), fatty oils (non minerals), cosmetics and skincare products, and various types of dirt touched by bare hands (or dirty gloves).

　　1、 Hazards of Finger Printing in PCB Manufacturing Process:

　　1. Chemical reactions occur on the copper surface of the board in a very short period of time, leading to oxidation of the copper surface; After electroplating, obvious fingerprints appear, causing serious defects in the appearance of the product.

　　2. The bare hand touch plate before soldering can affect soldering, leading to poor adhesion of green oil and foaming and detachment during hot air leveling.

　　3. Touching the board with bare hands can lead to unclean surface and poor solderability.

　　4. Finger prints on the wet film or silk screen printing circuit and the board surface before pressing can easily cause a decrease in the adhesion of the dry/wet film, leading to infiltration and coating separation during electroplating.

　　5. If the impact of finger prints is not standardized and eliminated, it can damage the product's qualification rate, resulting in long production and processing cycles, high rework and replenishment rates, and low on-time delivery rates.

　　2、 How to eliminate finger marks generated during the production process of bare PCB circuit boards

　　1. Develop a good habit of picking and placing boards;

　　2. Carrying gloves and fingertips;

　　3. Gloves must be worn for processes where gloves can be worn;

　　4. Set an example and teach by example, "Hold the edges of the board in two hands, flat and flat, with the palm as the axis and rotating coaxially.

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