Middle layer, is in the PCB layers between the top and bottom, its structure as shown in figure 1-1, readers can refer to figure the annotations to understand. How to complete the middle layer in the process of production? Simply sandwich plate is to suppress multiple single plate and double plate, the middle layer is the original single panel and double panel at the top or bottom. In PCB production process, you first need to on a substrate (general synthetic resin materials) apply the copper film on both sides, then through light painting and other technology transfer drawings of wire connection relationship to PCB board (printed in drawing wire, welding plate and the hole coated to protect it, and prevent the part of the copper film is corrosion in the corrosion process), again by means of chemical etching (FeCl3 or H2O2 as the main component of corrosion liquid) there will be no corrosion protection of copper film laminating machine, finally complete drilling, silk-screen printing layer and so on post-processing work, such basic completed a printed circuit boards.
Similarly, multilayer PCB is in more than one plate layer adopts the suppression process again after the completion of the compressed into a piece of circuit board, and in order to reduce costs and via interference, multilayer PCB often was not much thicker than the double plate and single board, this makes the composition of multilayer PCB board layer relative to the ordinary double-layer plate and the thickness of single layer board often smaller, lower mechanical strength, higher demand for processing. So the multilayer PCB production costs compared with the ordinary double plate and the single board will be expensive.
Ms Grace Zhang
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Oversea sales
Wonderful PCB
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