Description

PPS filter bags (polyphenylene sulfide) are highly valued in industrial filtration for their exceptional resistance to chemical corrosion and high temperatures, particularly in applications dealing with acidic gases. They are produced by needle-punching PPS fibers, creating a robust and effective filtration medium.  

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

Manufacturing and Properties:

• Material: These bags are made from PPS fibers. The fibers are needle-punched to create a durable, non-woven felt.   
• Needle Punching: The PPS fibers are mechanically interlaced through the needle-punching process, forming a porous filter medium with good depth filtration capabilities.
• Treatments: Surface treatments can be applied to enhance specific properties, such as:
  • Water and oil repellency.
  • PTFE coatings or membranes for improved filtration efficiency.
• Construction: The felt fabric is fabricated into bags with various attachment options for installation in filter housings.
• Chemical Resistance: PPS exhibits excellent resistance to acids and alkalis, making it suitable for corrosive environments.
• Temperature Resistance: These bags can withstand continuous operating temperatures up to approximately 190°C (374°F), with short-term peaks reaching higher. 
• Durability: They offer good resistance to abrasion and chemical degradation. 

Applications:

• Coal-Fired Power Plants: Used for filtering flue gases containing sulfur oxides.
• Waste Incineration: Essential for handling corrosive gases from waste combustion.
• Cement Industry: Used in applications where acidic gases are present.
• Chemical Processing: Suitable for filtering corrosive gases and dust.
• Metallurgical Industry: used in the filtration of gases produced from metal processing.

Advantages:

• Excellent Chemical Resistance: Highly resistant to acids and alkalis, extending their lifespan in corrosive environments.
• High-Temperature Resistance: Capable of withstanding elevated temperatures.
• Good Durability: Provides reliable filtration performance in demanding industrial settings.
• Hydrolysis Resistance: Good resistance to hydrolysis.

Finish Treatment:

• Antistatic Line Type (AS–L).
• Antistatic Blend Type (AS–B).
• Antistatic Cross Line Type (AS-X).
• PTFE Membrane (M).
• PTFE impregnation (TPI).
• Water & Oil Repellent (WR).