Can air compressors be used for liquid beverage cans?
Technical description on the application of air compressor in liquid beverage canning
Air compressors play an important role in the liquid beverage canning process, and their application must strictly follow food-grade safety standards and process requirements. After systematically sorting out industry specifications and technical practices, their applicability and technical points are explained as follows:
1. Core application scenarios
- Bottle blowing and forming process
- High-pressure oil-free compressed air is delivered to the blow molding machine mold, where the bottle is formed by heating the preform and stretching the plastic
- Pressure requirements: Usually 8-12bar is needed to stabilize the pressure to ensure the uniformity of the bottle wall thickness
- Cleanliness requirements: The compressed air needs to pass through a three-stage filtration system to ensure that particulate matter above 0.5μm ≤3520/m³
- pneumatic control system
- Drive the filling machine cylinder to accurately open and close the filling valve, and the pressure is usually controlled at 4-6bar
- To maintain stable operation of the conveyor belt, a pressure buffer tank needs to be configured to ensure continuity of gas supply
- Pressure sensors are equipped at key workstations to monitor pressure fluctuations ≤±0.02MPa in real time
- Cleaning and drying processes
- Use compressed air to purge the inside of the bottle before filling to remove particulate contaminants
- Configure a freezing dryer to control the dew point temperature below-40℃ to prevent condensed water from remaining
- Install activated carbon filter to remove odors and ensure pure flavor of drinks
2. Quality control standards
- microbial control
- Total bacterial count ≤10CFU/m³, molds/yeasts ≤10CFU/m³
- Equipped with a sterilization filter, the filtration efficiency of particulate matter above 0.01μm is ≥99.999%
- Conduct monthly microbial sampling and testing, using R2A nutrient agar medium
- cleanliness requirements
- Oil content ≤0.01mg/m³, oil-free compressor or high-efficiency oil removal filter is required
- Dust particle standard: ≤3520 particles above 0.5μ m/m³ (ISO 8573-1 Class 5)
- Carry out daily sampling and testing at the end of the pipeline to establish a particulate matter distribution map
- moisture control
- Pressure dew point ≤-40℃ to prevent the growth of bacteria in pipeline condensate
- Equipped with a twin-tower regenerative adsorption dryer to ensure continuous gas supply stability
- Check the dew point temperature before starting up each shift and use a calibrated digital dew point meter
3. Equipment selection specifications
- compressor type
- It is recommended to use oil-free lubricated screw compressors to reduce the risk of oil pollution from the source
- Key workstations are equipped with a frequency conversion drive system to automatically adjust the pressure according to the air consumption
- ISO 8573-1 Class 0 certification is required to ensure oil-free air supply
- aftertreatment system
- Pre-filtration: Equipped with F8-level bag filter, filtration efficiency ≥95%@1μm
- Fine filtration: H13 HEPA filter is used, with filtration efficiency ≥99.95%@0.3μm
- Oil removal device: equipped with activated carbon adsorption tower, adsorption efficiency ≥99%@0.01μm oil vapor
- auxiliary equipment
- Air storage tank: configured at 10-15% of the maximum air consumption to effectively buffer pressure fluctuations
- Piping system: Super piping (high-performance alloy aluminum material) is used, with inner wall roughness ≤0.6μm
- Monitoring system: Equipped with online dew point meter, oil detector, particle counter
4. Operation and maintenance management requirements
- daily maintenance
- Filter replacement: Press the difference gauge to indicate replacement, and the maximum pressure difference is ≤0.2MPa
- Desiccant regeneration: Deep regeneration is carried out every 4000 hours, and the replacement cycle is ≤3 years
- Pipeline disinfection: Ozone pulse disinfection is carried out every month, with a concentration of ≥5ppm remaining for 2 hours
- regular calibration
- Safety valve: Conduct start-up and tripping test every quarter, and the error is controlled within ±3%
- Pressure gauge: Level I precision gauge needs to be submitted every year, and Level II precision gauge needs to be submitted every two years
- Flowmeter: zero-point calibration is carried out monthly and linearity verification is carried out annually
- Emergency Management
- Standby unit: Equipped with N +1 redundant system, single unit fault switching time ≤ 30 seconds
- Emergency plan: Develop a compressed air interruption response process, and allocate air tanks at key workstations
- Training system: Operators must pass ISO 22000 food safety management system training and assessment
It is recommended that beverage companies establish a compressed air quality management system (CAQMS) and incorporate the air supply system into the scope of process verification. For new construction or renovation projects, CFD fluid simulation analysis should be carried out to optimize the pipe network layout. During system acceptance, the tracking verification of 3 complete production batches needs to be completed to ensure that the filling pass rate is ≥ 99.95%. Carry out regular audits of the gas supply system, and it is recommended to conduct a comprehensive energy efficiency assessment every two years to continuously optimize operating parameters.