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What are the applications of circuit board dispensing, soldering, and sealing assembly lines in the
source：m.numie.cn | Release time：2025年11月05日1、 Core application scenario: Covering mainstream consumer electronics products
The processes of this assembly line (dispensing, soldering, and sealing) can be flexibly combined according to the circuit board requirements of different products, adapting to the production of micro to medium-sized circuit boards. The following are typical scenarios:
1. Smartphones and wearable devices (high-frequency applications)
Glue dispensing process: used for underfill of motherboard chips (such as CPU and baseband chips), injecting epoxy glue correctly through a glue dispenser to fill the gap between the chip and the circuit board, preventing chip desoldering when the phone falls; Simultaneously used for fixing the camera module circuit board, applying UV glue for quick curing to ensure stable connection between the camera and the motherboard.
Soldering process: Automatic soldering machines are used to solder micro components (such as resistors, capacitors, and connectors) on the motherboard, especially suitable for high-density solder joints on mobile phone motherboards (such as ≥ 50 solder joints per square centimeter), to avoid virtual soldering and leakage problems caused by manual soldering and ensure stable signal transmission (such as 5G antenna solder joints).
Sealing process: mainly used for sealing circuit boards of mobile phone charging ports and RF modules. After sealing with silicone or epoxy resin, it isolates water vapor and dust, prevents short circuits during charging, and improves drop resistance (such as cushioning the impact force of the sealing layer when the phone falls).
Typical products: iPhone motherboard, Huawei watch circuit board, AirPods charging case circuit board.
2. Laptops and tablets
Glue dispensing process: For the CPU and graphics card chips on the laptop motherboard, apply thermal conductive adhesive (such as silicone thermal conductive adhesive) to enhance the chip's heat dissipation efficiency and avoid overheating and lagging during computer operation; Simultaneously used for fixing the keyboard module circuit board, apply hot melt adhesive to stick the circuit board to the keyboard bracket, preventing the circuit board from shifting when the keys are pressed.
Soldering process: Complete the pin soldering of notebook interface circuit boards (such as USB-C and HDMI interfaces). The interface solder joints need to withstand frequent insertion and extraction forces. The automatic soldering machine can ensure the strength of the solder joints by controlling the amount of solder (such as 0.1-0.3mm solder points), reducing interface loosening faults.
Sealing process: used for sealing the battery management circuit board (BMS) of tablet computers. The circuit board is wrapped with flame-retardant sealing glue to prevent short circuit and fire in case of overcharging or overdischarging of the battery, thus improving equipment safety.
Typical products: Lenovo laptop motherboard, iPad Pro battery management board.
3. Smart Home and Small Appliances
Glue dispensing process: Apply sealant on the microphone module circuit board of smart speakers (such as Xiao Ai) to isolate external noise interference and ensure speech recognition sensitivity; Apply waterproof glue on the control circuit board (such as touch panel circuit board) of rice cookers and microwave ovens to prevent water vapor from entering and causing short circuits during cooking.
Soldering process: Complete the component soldering of smart home sensor circuit boards (such as temperature and humidity sensors, human infrared sensors). These circuit board components have small volumes (such as 0402 packaged resistors), and automatic soldering machines can correctly position and solder them to avoid damage to components caused by manual soldering.
Sealing process: Used for sealing the motor drive circuit board of the robotic vacuum cleaner. The circuit board is wrapped with wear-resistant sealing glue to prevent dust and hair from entering the circuit board during sweeping, while also resisting the influence of motor vibration on solder joints and extending its service life.
Typical products: Xiaomi smart speaker circuit board, Ecovacs sweeping robot motor drive board.
4. Game consoles and audiovisual devices
Glue dispensing process: Apply conductive adhesive onto the button circuit board of a game controller (such as PS5 controller) to ensure stable conductivity when pressed and avoid button failure; Apply damping glue on the Bluetooth module circuit board of the Bluetooth earphones to reduce the impact of headphone playback vibration on the circuit board and ensure sound quality transmission.
Soldering process: Complete the soldering of the storage chip (such as SD card interface chip) of the game console (such as Switch). The solder joints of the storage chip need to transmit data stably. The automatic soldering machine can use hot air soldering technology to ensure that there is no virtual soldering of the solder joints, reducing game lag and data loss problems.
Sealing process: used for sealing the light source drive circuit board of the projector. The circuit board is wrapped with high-temperature sealing glue (capable of withstanding high temperatures of 80-120 ℃) to prevent damage to components caused by high temperatures during long-term operation of the projector and ensure projection stability.
Typical products: Switch host storage chip circuit board, XGIMI projector light source driver board.
2、 Core value: Adapt to the production needs of consumer electronics
The application of this assembly line in the field of consumer electronics is essentially to solve the three major production pain points of "miniaturization, high stability, and high safety":
Adapting to the trend of miniaturization: Consumer electronic circuit boards are becoming smaller and smaller (such as mobile phone motherboards with an area of only 10-15cm 2), and automated equipment on assembly lines (such as high-precision dispensing machines with a positioning accuracy of ± 0.01mm) can complete the processing of micro components, avoiding manual errors.
Enhance product stability: By using adhesive fixation, soldering reinforcement, and sealing protection, reduce the occurrence of malfunctions in consumer electronics during daily use (such as phone drops, computer overheating, and household appliances getting damp), lower after-sales costs, and improve user experience.
Ensuring safety during use: The flame retardant, waterproof, and insulating properties of the encapsulation process can prevent safety hazards such as short circuits and fires in circuit boards (such as fire prevention in battery management board encapsulation and leakage prevention in small household appliance circuit board encapsulation), and comply with consumer electronics safety certification standards (such as CE and UL certification).
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