Talking about the PCB copying method of high-precision multi-layer board

In the work of PCB copying, single-sided and double- sided are the most common and simplest circuit board copying. I believe everyone is familiar with it. But for multi-layer advanced PCB boards, it is not so simple. High Precision Multilayer Board

  So how to replicate the PCB of these multilayer boards? Several techniques for PCB replication of multilayer circuit boards are described below. In fact, the four-layer board is duplication of two double-sided boards, and the sixth-layer board is repeated with three double-sided boards. Multilayer boards are intimidating because we can't see the internal wiring. circuit board

  A sophisticated multilayer board, what do we think of its interior space? There are many methods of layering, such as etchant etching, tool stripping, etc., but it is easy to separate the layers and lose data. Experience tells us that sandpaper polishing is the most accurate.

  Once the top and bottom layers of the PCB are replicated, the surface layers are usually sanded to reveal the inner layers. Sandpaper is regular sandpaper sold at hardware stores, usually the PCB is rolled out and then pressed and rubbed evenly over the PCB. (If the board is small, you can also smooth out the sandpaper and wipe the sandpaper while pressing the PCB with one finger). The point is to flatten it so it can be ground evenly. The silk screen and green oil are usually wiped, and the copper wire and copper skin should be wiped several times. Generally speaking, a Bluetooth board can be wiped in a few minutes, while a memory stick takes about ten minutes. Of course, if you have more energy, it will take less time; if you have less energy, it will take more time. pcba circuit board

  Grinding plate is the most commonly used layering solution at present, and it is also the most economical solution. We can find a scrapped PCB and try it. In fact, grinding the plate is not technically difficult. A little boring. With a little effort, you don't have to worry about grinding the board onto your fingers.