The appearance of multi-layer PCB and double-sided PCB can not be seen if you do not pay attention to the distinction, because the appearance is basically the same, maybe someone will ask! Is the multilayer circuit board not many layers? How do you think it is a board? The price is still relatively high.
In fact, the number of layers of the multilayer circuit board is in the inner layer, 1-2 layers are checked for 1 layer single panel, 2 layers are referred to as double panels, and 3 to 48 layers are called multi-layer boards. The higher the number of layers, the higher the unit price is because The inner layer of the line is to be pressed. The technical content of the pressing process is high, and the machine cost is relatively high. If you want to rent a equipment supplier, the price is 1000-5000 a day. If you buy it, it is at least 2 million. - 10 million! It is not cost-effective to buy, after all, is high-tech, follow-up maintenance has certain difficulty, technical content is equal to cost, we all know that the quality requirements of multi-layer circuit boards are very strict. In the previous process, a little bit of scrapping, then the entire PCs regular PIN is scrapped. If the post-process is scrapped, and there is a little bit of quality anomaly, the pre-process is equal to white.
So how do we distinguish a piece of finished product from a common double-panel or multi-layer circuit board?
1, the more layers, the greater the shadow inside the sheet;
2, the double panel is the line and ink on both sides;
3, double-sided pcb board is not visible in the line, is pure sheet material, pure glass fiber;
4. If the board is a die punch, you can insert the edge of the board by hand to make the board smooth and recognizable;
5, hidden shadows can be seen in the multilayer circuit board, a little dim, deep can see the line;
6, the board of the multi-layer circuit board is generally used KB material, relatively smooth, especially after the molding process can be seen.
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