What are the advantages and applications of flexible microcircuits?
FPC Reinforcement Types
Criteria for Classification of electronic Component Classes
Four softwares suitable for beginners to draw PCB circuit boards
What information is needed for SMT processing?
What are the advantages of small and medium batch SMT processing?
PCB related knowledge- The purpose of each layer of the PCB
How to do heat resistance testing for PCB board
Detailed explanation of rigid-flex board and IC carrier board
PCBA prototype procedure
Defects which can be detected by the SPI
What are the spacing requirements for designing PCB circuit boards?
What are the classification and advantages of PCB metal substrates?
Difference between the processing technology of 1Layer AL PCB and 2Layer AL PCB
Introduction of FPC Cable and its usage
advantages of Shenzhen SMT assembly factory
inspection items before PCB ordering
usages of ceramic substrates
main applications of PCB boards
Cost-effective PCB product services
How to check short circuit of a circuit board during manual soldering
Identify the polarity of electronic components during PCBA processing
Means Which Can Prevent Component Shifting in SMT Processing
Skills of PCB prototype manual soldering
Reasons for the shift of Components in the SMT Process
Seven Types of PCB Probes
What Should Be Paid Attention to in Layout of High-frequency PCB
Precautions for PCB CCL Selection
Advantages of LED Plant growth light
Advantages of using LED grow lights to grow industrial hemp
Detailed explanation of PCB manufacturing process and precautions
Detailed explanation of PCB manufacturing process and precautions
How to draw multilayer PCB on Altium Designer
Three basic elements of interference and how to suppression them.
Decrease interference between digital circuit and analog circuit
SMT Component Placement Process Of Parts : Manual Placement
SMT factory incoming PCB material inspection
Basic concepts commonly used in PCB design
Ideas and principles of High speed PCB layout
Component layout rules and safety distance considerations
SMT assembly process quality specification
5 points in PCB layout
Professional interpretation of SMT
Advantages and disadvantages of different PCB surface treatment
Special process in PCB prototype
Why the via hole become open after component assembly
Keep the cost of the PCB as low as possible
what are the causes of PCB board heating radiation problem
Pad size and via diameter dimensions consideration in PCB prototyping
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

Five reasons for PCB deformation and six solutions

With the continuous development of surface mount technology in the direction of high precision, high speed, and intelligentialize, there are also higher requirements for the flatness of PCB boards. PCB board deformation is a very troublesome thing for many PCB assembly factories. Today, China PCB manufacturer SYS Technology will share with you some reasons and solutions for PCB board deformation.

The reasons for the deformation of the PCB board are:
1. When the circuit board is designed, the copper is unevenly distributed and warped after compressing.
2. The circuit board is impacted by the external heat and cold, causing sudden cooling and heating.
3. The quality of the circuit board raw material is poor.
4. The size of the panel is too large.
5. The circuit board profile is irregular.

The solutions given for the causes of PCB board deformation are:
1. Lower the reflow soldering temperature
Temperature is the main source of PCB board internal stress. As long as you lower the temperature of the reflow oven or slow down the heating and cooling speed of the circuit board in the reflow oven, the occurrence of board bending and board warping can be greatly reduced.

2. Use high TG CCL
TG value is the temperature at which the material changes from the glass state to the rubber state. The lower the TG value, the faster the circuit board starts to soften after entering the reflow oven, and the time it takes to become soft rubber state will be shorter. Of course, the deformation of the circuit board will be more serious, and the use of a higher TG CCL can increase its ability to withstand stress and deformation. 

3. Increase the thickness of the PCB board
If there is no requirement for lightness and thinness, it is best to use a thickness of 1.6mm for the PCB board, which can greatly reduce the risk of bending and deformation of the board.

4. Reduce the size of the PCB board and the number of PCB in each panel
Most of the reflow ovens use chains to drive the PCB board forward. Try to put the long side of the PCB board as the board edge on the chain of the reflow oven, which can reduce the depression and deformation caused by the weight of the PCB board itself. The decrease in panelization number is also based on this reason. That is to say, when passing the oven, try to use the narrow side perpendicular to the direction of the oven to achieve the lowest depression deformation.

5. Use tray fixture during reflow soldering
Whether it is thermal expansion or cold contraction, the tray can hold the PCB board and wait until the temperature of the board is lower than the TG value and start to harden again, and it can still maintain the original size.
If a single-layer tray cannot reduce the deformation of the PCB board, add a tray as lid to hold the PCB board with the upper and lower two layers trays, so that the problem of PCB board deformation through the reflow oven can be greatly reduced.

6. Use real connections and stamp holes instead of V-Cut to connect boards
Since V-Cut will destroy the structural strength between the PCB boards, try not to use the V-Cut in panel arrangement, or reduce the depth of the V-Cut.

Supplementary instruction:
In the automated surface mounted line, if the PCB board as the basement of various components is not flat, it will cause inaccurate positioning, the components cannot be inserted or mounted precisely on the holes or surface mounted pads of the circuit board. In severe cases, the automatic insertion machine may be damaged.