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SMT is the abbreviation of Surface Mount Technology. It is the most popular technology and craft in the electronic assembly industry.
SMT environmental requirements:
1. Requirements for plant load-bearing capacity, vibration and noise:
The load-bearing capacity of the plant floor should be greater than 8KN/m2; the vibration should be within 70dB, and the maximum value should not exceed 80dB; the noise should be within 70dBA.
2. Power supply:
Generally, single-phase AC220 (220±10%, 0/60Hz) and three-phase AC 380 (380±10%, 50/60Hz) are generally required. The power of the power supply should be more than twice the power consumption.
3. Air source:
The pressure of the air source can be configured according to the requirements of the equipment. The air source of the factory can be used, or an oil-free compressed air machine can be configured separately, and the pressure is generally greater than 7kg/cm2.
4. Exhaust:
Reflow soldering and wave soldering equipment must be equipped with exhaust fans. For all hot blast stoves, the minimum flow value of the exhaust duct is 500 cubic feet per minute (14.15m3/min)
5. Lighting:
The ideal illumination in the workshop is 800~1200LUX, at least not less than 300LUX.
6. Working environment:
Keep the plant clean and sanitary, free of dust and corrosive gases.
The best ambient temperature of the production workshop is 23±3℃, generally 17～28℃, and the relative humidity is 45%～70%RH.
Anti-static requirements:
1. SMT workshop floor: Anti-static polyvinyl chloride (PVC) floor and epoxy resin dust-proof artesian floor anti-static floor can be used in two ways.
2. Operators: uniform anti-static clothing, gloves, shoes, hats, and anti-static wristbands at each station.
3. Production line: Each station has a corresponding electrostatic interface, which is connected to the electrostatic system of the entire SMT workshop; each workbench uses an anti-static mat.
4. Wear an anti-static wrist strap during operation, and measure whether the wrist strap is effective every day.
5. Warehouse: The raw materials are stored in a special anti-static material cabinet, and corresponding anti-static measures are taken.
❙ SMD Assembly Line Video