Compressed air gas requirements for textile printing and dyeing industry

Quality requirements and technical specifications for compressed air in textile printing and dyeing industry

The textile printing and dyeing industry is a manufacturing field that is highly dependent on compressed air, and its production process has strict requirements on the quality of compressed air. Compressed air needs to meet the three core standards of oil-free, dryness and cleanliness, and has stable pressure output capabilities to ensure textile quality and equipment operation reliability.

1. Core quality parameter requirements

1. Oil content control
   Oil in compressed air can cause fabric contamination, blocked nozzles and equipment wear. The industry requires that the oil content should be less than 0.6mg/m³, which is equivalent to ISO 8573-1 air quality standard Level 2. Oil-free technologies such as water-lubricated screw air compressors can achieve zero oil pollution and avoid interference from oil content on production.

2. humidity control
   The water content of unprocessed compressed air changes with the environment and is easy to condense in the pipeline, causing corrosion and polluting loom components. The pressure dew point needs to be controlled at 4-10 ° C through drying equipment to ensure that liquid water does not separate out of compressed air during transportation and meet the level 4 requirements of ISO 8573-1 standard.

3. cleanliness requirements
   Particulate matter in the air can accelerate equipment wear and contaminate products. Industry regulations stipulate that the dust content must be ≤1mg/m³, and the particle size must be ≤3-5μm, reaching ISO 8573-1 standard Level 2. The high-efficiency filtration system can effectively intercept impurities and ensure the cleanliness of the gas end.

2. Pressure and stability requirements

1. pressure adaptability
   Core equipment such as air-jet looms requires stable pressure input, and usually requires inlet pressure ≥0.5MPa. The low-pressure air compressor can be customized for the textile industry in the exhaust pressure range (0.2-0.5MPa) to avoid energy waste.

2. Pressure fluctuation control
   Pressure fluctuations need to be controlled within ±0.01MPa to ensure accurate weft insertion. Centrifugal compressors are suitable for large-scale textile production lines because of their stable flow and stable pressure.

3. System design and maintenance specifications

1. Equipment selection principles
   The compressor type needs to be selected based on gas consumption, pressure requirements and fluctuations in working conditions. For example, a centrifugal model should be selected for scenarios with a large number of cloth machines, and a gas storage tank should be configured to buffer peak gas consumption.

2. Drying and filtration configuration
   The processing capacity of the dryer needs to exceed the compressor gas production by more than 20% to prevent overloading of the adsorbent. The adsorbent replacement cycle is 12-18 months, and the diffuser needs to be inspected regularly to avoid filter failure.

3. Operation monitoring and maintenance

   • Inspect pressure, temperature, oil level and other parameters daily to record equipment operating status.
   • Drain condensate from the air storage tank every month and check the tightness of the drive belt.
   • Calibrate safety valves and pressure gauges every six months to ensure system safety.
   • Comprehensive performance testing is carried out every year to assess the quality of compressed air.

4. Impact of quality on production

1. Direct contact process requirements
   In printing, dyeing, spraying, air twisting and other links, compressed air is in direct contact with textiles, and its water content and oil content directly affect dyeing uniformity and cloth surface finish.

2. Equipment protection needs
   Clean compressed air can extend the life of precision parts such as nozzles and reeds, and reduce equipment downtime caused by impurities.

3. Energy efficiency and cost correlation
   Compressed air with stable pressure and up to standard quality can reduce the failure rate of loom machines. Combined with energy-saving technologies such as magnetic levitation, the comprehensive energy efficiency can be improved by 27%-36%.

conclusion
The textile printing and dyeing industry needs to build a full-process quality control system from compressed air generation to terminal use. Through scientific selection, precision filtration, intelligent monitoring and preventive maintenance, compressed air quality can be continuously met, product quality stability can be ensured, equipment operation and maintenance costs can be reduced, and the industry’s transformation to efficient and green manufacturing can be promoted.