PCB is a kind of electronic parts, is also the carrier of the whole PCBA, other electronic parts are mounted on the PCB pad, play their respective electronic communication function.
Patch must be used PCB. PCB in the production out of the general are vacuum packaging, in the pick and place machine patch before the need for pcb baking?
Basically baking for subsequent welding will be better.
How long does it take to bake the PCB?
Need to be divided according to the PCB storage time.
For PCB that has been stored for 1-2 months, baking for about 1 hour is usually sufficient.
Storage of PCB less than 6 months, general baking about 2 hours can be.
Storage of more than 6 months, 12 months below the pcb, general baking about 4 hours.
More than 12 months storage period, generally recommended not to use.
What is the appropriate baking temperature?
Baking temperature in principle at 120 ℃, because the purpose of baking is to remove moisture, as long as more than the evaporation temperature of water vapour can be, generally 105 ℃ to 110 ℃ can be.
Why baking, no baking will bring what risk?
Why PCB baking, is to remove moisture and humidity. Because PCB is a multilayer board laminated together, stored in the natural environment there will be a lot of water vapour, water vapour will be attached to the surface of the pcb or drilling into the interior.
If not baked, water vapour in the reflow oven soldering rapid warming, water vapour reaches 100 ℃, it will produce a lot of thrust, if not timely excluded, may pcb will burst or damage to the internal circuitry, resulting in a short circuit or subsequent use of the process of intermittent bad problems.
How should PCB baking be stacked?
Generally thin and large size pcb is not recommended to put vertical, because it is easy in the baking heat expansion and then cooling cold shrinkage, resulting in micro-deformation.
Small boards are recommended to stack, but it is best not to stack too much, to avoid pcb baking internal water vapour is not easy to evaporate.
Notes on PCB baking
After baking PCB, in the cooling arrangement should be placed when the weight of the pressure to avoid micro-deformation.
pcb oven should be set up within the exhaust device to avoid the evaporation of moisture from the oven can not be discharged.
Post time: Aug-11-2023