At present, in addition to the parts pin holes, mechanical holes, cooling holes and test holes, other through holes (such as Via holes) do not need to be exposed and require solder proof ink plugs,

especially HDI high-density connection technology is becoming more and more dense, and more and more VIP holes and VBP holes are used for packaging PCB boards, and more and more require

plug oil. So what are the benefits of using solderproof jack holes, then introduce it next

Green oil plug hole is to plug green oil through the hole, generally to fill two-thirds of the part, light is better. Generally, if the hole is large, according to the manufacturing capacity of the plate

factory is not the same, the size of the ink jack hole is not the same, the general 16mil below the hole can be plugged, and then the large hole should be considered whether the plate factory can plug.

1. the jack can prevent the possibility of short circuit caused by densely spaced devices (such as BGA). This is the reason for the through-hole fortress hole under the BGA during the design process.

Because there is no jack, there has been a short circuit case.

2. the plug hole can prevent the PCB through the through hole through the component surface caused by short circuit; This means that within the range of the wave soldering design area (the general

welding surface is 5mm or above), there is no hole or the reason for the hole to be plugged.

3. avoid flux residue in the through hole.

4. After the surface mounting and component assembly of the electronics factory is completed, the PCB should absorb vacuum to form negative pressure on the test machine.

5. prevent the surface solder paste into the hole caused by virtual welding, affecting the installation; This is most obvious in the cooling pad through the hole.

6. to prevent over wave soldering tin bead pop out, resulting in short circuit.

7. the plug hole will be helpful to the SMT process.