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The three main points that really determine the quality of PCB! ! !
2021-09-09
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Author:Frank



   Although many customers and friends have been deeply involved in the electronics industry for many years, as the saying goes: There is a specialization in the technical industry! For the judgment of the true quality of the PCB, you may still be really uncertain. The editor has been in the PCB industry for ten years. Today I will briefly tell my friends: the three factors that really determine the quality of PCB boards!
One: hole copper.
Hole copper is a very critical quality indicator! Because the conduction of each layer of the board depends on the hole copper, and this hole copper needs to be electroplated with copper. This process takes a long time and the production cost is high. Therefore, in the environment of low price competition, some factories have begun to cut corners. , Shorten the copper plating time. Especially in some allegro factories, in recent years, many allegro factories in the industry have begun to apply a "conductive glue process". The advantages of this process are: fast speed, low cost, and an average cost saving of 20-30 yuan per square meter. However, it There is a fatal flaw, that is, the thickness of the copper plating is not enough.
This can be said to be a secret in the industry, and few people outside the PCB industry know this. The board made by the conductive adhesive process has thin and uneven hole copper. If it is used in consumer products, it can meet the needs, but if your product has requirements for quality, it must be energized for a long time, under vibration, and under conditions. careful!

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Two: Plate.
In the fixed cost of PCB, board accounts for nearly 30%-40% of the cost. It is conceivable that many board factories will cut corners in the use of boards in order to save costs. Everyone knows that the sheet material we use, scientific name: FR-4, is a glass epoxy resin. The difference between a good board and a bad board is as follows:
1. Fire rating. There is a secret in our industry that is not open to the public. Many board factories are using non-flame retardant sheets. This ratio is huge! If you tell me the price of the 2-layer board you bought is less than 300 yuan/square, then I tell you, please take out the lighter and take a look! Non-flame retardant sheets can be ignited. If non-flame retardant sheets are used in your products, the consequences will be risky. Evaluate this yourself!
2. Fiber layer. Qualified panels are normally made by pressing at least 5 glass fiber cloths. This determines the breakdown voltage and fire tracking index of the board.
3. The purity of the resin. Poor sheet material has a lot of dust. It can be seen that the resin is not pure enough. This kind of sheet is very dangerous in the application of multi-layer boards, because the holes of the multi-layer board are very small and dense!

Three: pressing.
To see if a board factory has the strength, it is not professional to do multi-layer boards, you only need to ask one question: Do you have your own laminating machine?
At present, many small factories in the market are outsourcing the pressing, why? First of all, the pressing equipment is expensive and the cost is high. Secondly, if it is not a professional multi-layer board manufacturer, they generally choose to externally press.