Why does long stored PCB need to be baked before assembly or running through reflow oven?
- The purpose of baking is to remove the moisture from the PCB.
- No matter the PCB is at production site or still in vacuumed package, both would increase the risk that PCB can absorb moisture.
- If PCB is stored at a bad storage condition or over storage period, these would also make the PCB absorb moisture easily.
- The high temperature would cause inner board moisture evaporation when assembly the damp PCB.
- The PCB will have blister or delamination due to steaming.
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