How to Judge the Acceptance of PCB Quality
Which Color Circuit Board Sells the Most Expensive
Method to Solve the Noise Interference of Power Supply on High-frequency PCB Board
Disassembly Skills of Chip Components on PCB
What Factors Should Be Considered in the Selection of High-frequency PCB CCL
How to Place Special Components during PCB Layout
What Are the Functions of Capacitors in Circuits?
Testing Techniques for Common Electronics Components
What to do if There is a Short Circuit on the PCB
Desoldering Principles and knowhow during PCBA Processing
Black Oxidation of the Inner Layer of the Multilayer PCB
How to Ensure the High-performance Design of PCB
What Is the Printing Process of SMT Solder Paste?
PCB without fiducial mark, Is There Any Way to do SMT for It
What Are the Benefits of Reserving Break-up Tab for PCB Production
How Does SMT Affect PCB Production Time and Speed It Up
Classification of PCBs from three aspects
Common Problems and Solutions for Dry Film pasting during PCB Manufacturing process
Several Elements to Inspect after PCB Design
What is a halogen-free circuit board?
What Do Capacitive Coupling and Decoupling Mean?
What Are the Differences Between PCB Paste Mask and Solder Mask?
How PCBA Is Packaged and Shipped
How long can PCBA finished products be stored?
What Are the Differences and Relations Between PCB, PCBA, and SMT?
PCB Baking Specifications
PCB "Solder Mask Tenting" and "Solder Mask Opening"
Five reasons for PCB deformation and six solutions
Importance of first article inspection of PCBA board
Temperature zone standard for SMT reflow soldering
Small and medium volume PCB manufacturers in China
The main reason for PCBA cleaning
For power filter, the more capacitors, the better?
What does PCBA programming mean?
Content of PCB incoming testing
What conditions must be met for PCB circuit board soldering?
What is Blind via and Buried via
PCBA Manufacturers Temperature and Humidity Sensitive Components Management
Why choose Shenzhen SMT processing factory?
How long does it take to calculate the quotation for PCBA manufacturing?
Introduction of PCB design clearance requirements
Explanation of BOM, DIP, SMT, SMD
Introduction of the process of PCBA prototype
How to prevent pseudo soldering or cold soldering defects in PCBA manufacturing?
Factors that affect the Price of FPCB
What information is required for SMT processing at PCBA factory?
Skills of using 0ohm resistor in PCB design
How to select a PCBA manufacturer
SMT processing solder joint quality inspection
Characteristics difference between immersion gold PCB and gold plating PCB
Common malfunctions of Circuit Board Caused by Moisture
A Few Rules about PCB Panelization
Compare of multi-layer PCB with single/double layer PCB
Why do we need to introduce so many subdivided GND
Difference between immersion gold boards and gold plating boards
Aluminum PCB structure
Classification of different GND in circuit
Why PCB baking is necessary during manufacturing process
The handle and precautions of OSP board in SMT process
How to choose capacitors for filter decoupling
How to choose filter capacitor for switching power supply
5 database need for SMT process
Function of three-terminal capacitor
Introduction of PCB OSP surface treatment
Method of inspecting the quality of SMT by step
How to find the short point between VCC and GND
Difference between 850nm and 940nm infrared LED
Component layout of PCB SMT DFM
Pad shape influence on the strength and reliability of the soldering joints
The difference between high temperature solder paste and low temperature solder paste
Introduction to manual welding processing
Manual visual inspection in PCBA processing
Characteristics of the conformal coating process
Difference between hardware engineers and software engineers
PCBA processing operation rules
China PCB upstream materials has continued to soar
Difference between serial buses and parallel buses
The key points of quality control in PCBA processing
Common causes of solder beading during SMT process
Analysis of the advantages and disadvantages of HASL PCB surface
Requirements for layout of components during SMT assembly
Selection of electronic components and CCL for PCBA
Performance and appearance quality inspection of components.
Quality and Reliability of SMT Chip Processing and Production
Coupling and decoupling function of capacitor
Two methods to connect digital ground and analog ground
Common sense in SMT process

Why PCB baking is necessary during manufacturing process

Everyone who is engaged in the PCB manufacturing industry knows that copper clad board is a piece of copper foil attached to the insulating material. If it is baked, you will see that there will be shrinkage during the drying process, and stress in all directions will be generated. This is the source of internal stress.

Secondly, the purpose of baking PCB before drilling is actually for dehumidification. The baking before PCB drilling is in order to remove the moisture in the board and reduce the internal stress; PCB during solder mask and silkscreen process also need baking. Before vacuum packaging, there is also a process of compressing and baking, which is also to remove moisture, and the warpage of PCB can be greatly improved.

The baking mentioned above can eliminate the internal stress of the PCB board, which is to stabilize the size of the PCB. Its most significant advantage is that it can dry the moisture in the pad after baking, strengthen the welding effect, and reduce the pseudo welding and repair rate. However, baking will cause change in the color of the PCB board, which will affect the appearance.

Usually, the baking temperature is 100-120°C, and the baking time is about 2H. Please pay attention to don't bake for too long! If PCB is exposed to the air, it needs to be used up within a day, otherwise oxidation is prone to occur. Of course, this is not absolute. It also depends on the PCB supplier's production capacity. Some ENIG, HASL PCBs have a relatively longer storage time. The following will give you the PCB baking instructions for your reference:

1. If the PCB is unpacked for more than 5 days within 2 months of the manufacturing date, please bake it at 120 ±5°C for 1 hour before SMT assembly;
2. If the PCB is over 2 months from the manufacturing date, please bake it at 120 ±5°C for 1 hour before SMT assembly;
3. If the PCB is 2 to 6 months from the manufacturing date, please bake it at 120 ±5°C for 2 hours before SMT assembly;
4. If the PCB is over 6 months to 1 year from the manufacturing date, please bake it at 120 ±5°C for 4 hours before SMT assembly;
5. The baked PCB must be used up within 5 days (put into IR reflow), and if can not be used up within 5days, the remaining PCBs will need to be baked for another hour before SMT assembly;
6. If the PCB is more than one year from the manufacturing date, please bake it at 120 ±5°C for 4 hours before SMT assembly. Better is send it to the PCB factory to re-make surface treatment before SMT assembly.