PCBA Tech - Common sense of the baking sheet process of PCBA processing

Before PCBA processing, there is a process that many PCBA manufacturers will ignore, and that is the baking sheet. The baking sheet can remove the moisture on the PCB board and the components, and after the PCB reaches a certain temperature, the flux can better bond with the components and the pads. The welding effect will also be greatly improved. Let me introduce you to the baking sheet process in PCBA processing.

1. Instructions for PCBA processing baking sheet:

1. PCB board baking requirements: the temperature is 120±5 degree Celsius, generally bake for 2 hours, and start timing when the temperature reaches the baking temperature. Specific parameters can refer to the corresponding PCB baking specifications.

2. PCB baking temperature and time setting

(1) PCB sealed and unpacked within 2 months of manufacture date for more than 5 days, bake at 120±5 degree Celsius for 1 hour;

(2) PCBs with a manufacturing date of 2 to 6 months, bake at a temperature of 120±5°C for 2 hours;

(4) PCBs with a manufacturing date between 6 months and 1 year, baked at a temperature of 120±5°C for 4 hours;

(5) PCBs that have been baked must be processed within 5 days, and unprocessed PCBs need to be baked for another hour before they can go online;

(6) PCBs older than one year from the manufacturing date can be baked at 120±5°C for 4 hours and re-sprayed with tin to go online.

3. PCBA processing and baking method

(1) Large PCBs are mostly placed in a flat style, with 30 more stacked, and the PCB is taken out of the oven within 10 minutes after the baking is completed, and placed flat at room temperature to cool down naturally.

(2) Small and medium-sized PCBs are mostly placed horizontally, with more than 40 pieces stacked, and the number of vertical types is not limited. Take out the PCB from the oven within 10 minutes after baking, and place it flat at room temperature to cool down naturally.

4. The components that are no longer used after repairing do not need to be baked.

2. PCBA processing and baking requirements:

1. Regularly check whether the material storage environment is within the specified range.

2. The staff must be trained.

3. If there is any abnormality in the baking process, the relevant technical personnel must be notified in time.

4. Anti-static and heat insulation measures must be taken when touching materials.

5. Leaded materials and lead-free materials need to be stored and baked separately.

6. After baking, it must be cooled to room temperature before it can be put on line or packaged.

Three, PCBA baking precautions:

1. You must wear heat-insulating gloves when your skin touches the PCB board.

2. The baking time must be strictly controlled, not too long or too short.

3. The baked PCB board must be cooled to room temperature before going online.

PCBA processing plants should master the common sense of the baking sheet process of PCBA processing, and understand that the baking sheet can remove the moisture on the PCB board and components, and after the PCB reaches a certain temperature, the flux can better bond with the components and pads. Only the employees of PCB factory have certain knowledge of savings, can the quality of PCBA products be improved.