Aramid Fiber Filter Bags

 Product Introduction 

Aramid fiber filter bags (also known as Metas /Nomex filter bags) are bag-type dust removal filter bags made from aromatic polyamide fibers (DuPont Nomex, Teikan Conex) as core materials. They are formed through processes such as opening, carding, needling, high-temperature setting, and PTFE impregnation. Its core function is to intercept dust particles in high-temperature flue gas, and it is suitable for harsh environments with a continuous working temperature of no more than 204℃ and an instantaneous peak temperature of 240℃. The filter bag structure consists of a needle-punched felt layer and a base fabric. Through sewing technology, the risk of thread separation is ensured, significantly enhancing the sealing performance.

 Product features 

High-temperature resistance

It can withstand a long-term temperature of 204℃, an instantaneous temperature of 240℃, and decomposes and carbonizes only above 400℃. Its limiting oxygen index (LOI) reaches 30, and it has self-extinguishing properties. The thermal shrinkage rate is less than 1.5% (at 240℃), ensuring dimensional stability at high temperatures.

Chemical stability

It has excellent alkali resistance, moderate acid resistance (no effect from low concentrations of acids and alkalis), and is resistant to corrosion by most hydrocarbons and a small amount of fluorides.

• Physical properties

  Wear resistance: It can withstand the erosion of a high filtration air velocity of 1.2m/min, and the wear resistance test reaches 30,000 revolutions.

  Strength indicators: Tensile force in the warp direction >1100N/5cm, tensile force in the weft direction >1300N/5cm, elongation at break <35% (warp direction).

• Post-treatment process

  Optional PTFE coating (to enhance surface smoothness), water and oil repellent treatment (to prevent condensation), anti-static coating, etc., are available to adapt to different working conditions.

 Application scenarios 

Industry and working condition adaptation table

Special requirements for filter media in typical industry scenarios

Asphalt mixing, asphalt fume dust removal, high-temperature tar particle oil stain prevention, high sealing performance

Steel/metallurgical electric arc furnace smoke dust, lead oxide recovery metal dust, high-temperature flue gas wear-resistant and resistant to chemical corrosion

The tail gas from the cement production rotary kiln and the clinker cooler are highly alkaline dust resistant to alkali and have low resistance

The fly ash from waste incineration can capture acidic gases and heavy metal particles, is acid-resistant and flame-retardant

Drying of chemical catalysts, filtration of pigments, and anti-corrosion impregnation of strong corrosive aerosols with PTFE

Note: In the food/pharmaceutical field, FDA/GMP standards must be met, and a silicone-free process should be adopted to avoid secondary contamination.

 Product Advantages 

• Enhanced sealing performance: No pinholes or gaps, eliminating dust leakage from flower plate holes, and the bonding accuracy reaches 99%.

• Extended service life by 30% : Wear resistance and hydrolysis resistance reduce replacement frequency, and the overall cost drops by 20-40%.

• Efficiency and energy conservation: Air permeability 13-16m³/m²·min, resistance reduced by 15%, energy consumption decreased.

• Safety and compliance: Flame-retardant properties prevent fire risks, and certified by CE, GMP, etc.

  
  

 Customization process 

Demand confirmation

• Provide working condition parameters: temperature range, dust composition (such as pH value), and filtration accuracy (0.5-200μm).

• Size customization: Diameter (ø120-180mm), length (1-10m), matching the dust collector's flower plate holes.

Material and process selection

• Fiber selection: Imported Nomex or domestic aramid (such as fiber from Yantai, Shandong).

• Post-treatment solution: PTFE coating (anti-adhesion) or water-repellent treatment (moisture-proof condition).

Sample and Verification

• Prepare a small batch of samples and conduct inflation sealing tests (0.3MPa) and tensile strength inspections.

Delivery and Training

• Provide installation guidance and parameter debugging manuals (such as welding temperature and pressure Settings).

 Quality Inspection Process 

Adopt a three-stage quality control system

Raw material inspection

• Fiber material identification (DuPont/Teijin certification), gram weight (500±50g/m²), and thickness (2.0-2.4mm) testing.

• Uniformity test of PTFE coating (microscopic observation).

Production process monitoring

• Needle-punching density control: Ensure that the felt layer has no weak points.

• High-temperature setting verification: Thermal shrinkage rate ≤1.5% at 240℃.

Finished product testing

• Physical properties: Air permeability, breaking strength (warp direction >800N/5cm).

Functional testing

• Inflatable sealing performance (no leakage after holding at 0.3MPa for 5 minutes).

• Kerosene penetration test (to verify the integrity of PTFE coating).

• Particulate matter flushing test (fiber shedding ≤5mg/m²).

 Summary 

Aramid fiber filter bags, with their high-temperature stability, strong sealing performance and long service life, have become the core components of industrial dust removal, especially suitable for high-temperature and high-corrosion scenarios such as asphalt, metallurgy and chemical industries. Customization should focus on working condition parameters and post-treatment processes, and quality inspection must strictly cover the entire process from raw materials to functional verification. If you need specific technical parameter tables or sample applications, you can further contact the manufacturers (such as Jiangsu Aokai, Yancheng Zhiyue Environmental Protection).