Compressed air for cleaning in the electronics industry

In the electronics industry cleaning link, compressed air needs to meet ultra-low oil content (≤ 0.003 mg/m & sup3;), extremely low particle pollution (particle size ≥ 0.1μm particle number <1000/m & sup3;), deep drying (pressure dew point ≤-70 ℃ or even -100 ℃) to avoid product defects caused by oil, particle or water vapor contamination. The following analysis is based on four dimensions: application scenario, equipment selection, post-processing system, and security risk:

1. application scenarios and quality requirements

1. wafer cleaning
   • the surface of the wafer needs to be absolutely clean, and any micron-sized particles or oil contamination will cause lithography defects (such as short circuit and open circuit).
   • Compressed air ISO 8573-1 Class 0(oil content ≤ 0.003 mg/m & sup3;), pressure dew point ≤-70 ℃, to prevent water vapor oxidation of copper, aluminum and other precision lines.
2. PCB board cleaning
   • in laser cutting, drilling and other processes, compressed air is used to purge residues. If it contains oil or particles, it will contaminate the surface of the circuit board, causing insulation failure or short circuit.
   • To be satisfied dust particle ≤ 1 μm, oil content ≤ 0.01 mg/m & sup3; of standards.
3. Display and optical equipment cleaning
   • displays, lenses and other surfaces need high cleanliness, oil mist pollution will lead to optical performance degradation (such as reduced light transmittance, reflective enhancement).
   • Compressed air needs to pass through nanometer filtration (filtration accuracy ≤ 0.01 μm) ensure that there is no oil or particles.

2. equipment selection: oil-free screw air compressor as the core

1. oil-free design
   • the use of water-lubricated oil-free screw air compressor completely eliminates the risk of oil pollution and meets the extreme requirements of the electronics industry for air purity.
2. Intelligent Control and Energy Efficiency Optimization
   • the built-in intelligent control system automatically adjusts the operating status (such as load rate and exhaust pressure) according to production requirements to avoid energy waste.
   • Equipped with waste heat recovery system, the compression heat into hot water or heating purposes, improve energy efficiency (comprehensive energy efficiency increased by 15%-20%).
3. High reliability design
   • through the use of precision machining and highly durable materials (such as stainless steel rotors, aviation-grade aluminum alloy fuselage), it is suitable for the electronics industry 24 hours continuous operation the failure rate is less than 0.5 percent.

3. post-processing system: multi-stage purification to ensure quality

1. pre-filtering
   • installation pre-filter (filtration accuracy 5μm) intercept large particles of impurities and extend the life of subsequent equipment.
2. Precision filtration
   • adopt high-efficiency precision filter (filtration accuracy 0.01 μm) further remove tiny particles to ensure air cleanliness.
3. deep drying
   • configuration adsorption dryer (dew point ≤-70 ℃), The molecular sieve absorbs water vapor to prevent low-temperature icing from blocking the exhaust system or oxidizing metal lines.
4. online monitoring
   • installation particle counter, dew point meter, oil content detector, Real-time monitoring of compressed air quality, automatic alarm and shutdown when data is abnormal.

4. Security Risks and Control Measures

1. high pressure airflow injury
   • risk when the compressed air pressure is too high (e. g.> 0.7MPa), the airflow may break through the skin or enter the bloodstream, forming a bubble block (similar to a thrombus), resulting in tissue necrosis.
   • Control:
     • installation pressure regulating valve, Stabilize the outlet pressure 0.4-0.6MPa.
     • Operators wear protective glasses, anti-cut gloves avoid direct contact with the skin or eyes.
2. Particle Pollution Rebound
   • risk improper maintenance of post-processing equipment (such as filters not replaced in time) may cause particle pollution to rebound and contaminate the product.
   • Control:
     • formulation scheduled maintenance(such as every 2000 hours to replace the filter, every 5000 hours to clean the dryer molecular sieve).
     • Establishment compressed air quality archives record the dew point, oil content, particle number and other data, trace the source of pollution.
3. Equipment failure shutdown
   • risk: The failure of the air compressor may cause the entire production line to stop, and the loss can reach hundreds of thousands of yuan per hour.
   • Control:
     • configuration standby air compressor(Such as "3 for 1 standby" mode) to ensure fast switching in case of failure.
     • Installation AI intelligent monitoring system real-time monitoring of equipment vibration, temperature, pressure and other parameters, early warning of failure.