Acrylic filter bags are utilized for dust and particle removal, particularly in applications where resistance to hydrolysis and certain chemicals is crucial. They are produced by needle-punching acrylic fibers, and can be further treated to enhance their properties.

Here’s a more detailed look at acrylic needle felt filter bags:

Manufacturing and Properties:

• Material: These bags are made from 100% homopolymer acrylic fibers (polyacrylonitrile or PAN), which are needle-punched to create a non-woven felt fabric.
• Needle Punching: The acrylic fibers are mechanically interlocked through the needle-punching process, resulting in a strong and porous filtration medium.
• Treatments: Various treatments can be applied to enhance the performance of acrylic needle felt, including:
  • Water and oil repellency.
  • PTFE membrane lamination for improved filtration efficiency.
  • Heat setting, and other surface treatments.
• Construction: The felt fabric is fabricated into bags, with appropriate attachment mechanisms for installation in filter housings.
• Durability: Acrylic needle felt exhibits good resistance to chemical agents and hydrolysis.
• Temperature Resistance: These bags typically have a continuous operating temperature of up to approximately 125°C (257°F), with short-term surges reaching around 140°C (284°F).
• Chemical Resistance: Exhibits good resistance to acids, and alkalis. 

Applications:

• Cement Industry: Used in cement kiln applications.
• Waste Incineration: Effective in filtering gases from waste incineration processes.
• Chemical Processing: Used in dryers within the pigment, plastic, and catalyst industries.
• Mining and Minerals Processing: Used in dryers and finish mills.
• Metal Processing: Used in process collectors.

Advantages:

• Hydrolysis Resistance: Acrylic fibers offer excellent resistance to hydrolysis, making them suitable for applications with high moisture content.
• Chemical Resistance:  Good resistance to various chemical agents, including acids and alkalis.
• Good mechanical characteristics: The needle felt construction provides good filtration efficiency.
• Weathering resistance: Good resistance to sunlight, and weathering.