Polypropylene filter bags are widely used for liquid filtration across various industries, prized for their excellent chemical resistance and cost-effectiveness. They are produced by needle-punching polypropylene fibers, creating a depth filtration medium.   

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

Manufacturing and Properties:

• Material: These bags are made from 100% polypropylene fibers, which are needle-punched to form a non-woven felt fabric.
• Needle Punching: The polypropylene fibers are mechanically interlaced through the needle-punching process, creating a porous structure that traps particles throughout its depth.
• Treatments: Surface treatments like calendering or singeing can be applied to reduce fiber migration.
• Construction: The felt fabric is fabricated into bags, with various ring or flange options for secure installation.  
• Chemical Resistance: Polypropylene exhibits excellent resistance to a wide range of chemicals, including acids and alkalis.
• Temperature Resistance: These bags are suitable for lower temperature applications, with a typical maximum operating temperature around 90°C (194°F).
• Durability: They provide good durability for many applications.

Applications:

• Chemical Processing: Filtration of various chemical solutions.
• Food and Beverage: Filtration of liquids in food and beverage processing.
• Electroplating: Filtration of electroplating solutions.
• Water Treatment: Filtration of water and wastewater.
• Pharmaceuticals: Filtering various liquid solutions.

Advantages:

• Excellent Chemical Resistance: Highly resistant to acids, alkalis, and many other chemicals.  
• Cost-Effective: Polypropylene is a relatively inexpensive material, making these filter bags a cost-effective filtration solution.
• Good Filtration Efficiency: The needle-punched construction provides efficient depth filtration.   
• Hydrophobic properties: Polypropylene is naturally hydrophobic.

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).