Micron filter bags are a core consumable in industrial liquid and gas filtration. Their primary function is to capture solid particles above a specified micron (μm) size in order to achieve purification, clarification, or to protect downstream expensive equipment.
Description
Filmedia® is a professional manufacturer of liquid filter bags. We offer a wide range of micron-rated filter bags made from various materials, delivering reliable quality and comprehensive technical support to provide customized liquid filtration solutions for industries worldwide.
We supply:
- Polypropylene (PP) Needle-punched Felt Filter Bags
- Polyester (PE) Needle-punched Felt Filter Bags
- Polytetrafluoroethylene (PTFE) Needle-punched Felt Filter Bags
- Nylon Mesh Filter Bags
Micron level
5, 10, 25, 50, 100, 150, 200, 300, 400, 500, 600, or 5-2000um.
Filter Bags in Liquid Bag Filters
In a liquid bag filter system, the filter bag serves as the core element. Its primary function is to achieve fine separation and purification by intercepting solid particles while allowing the liquid to pass through. Liquid bag filters typically operate using a pressure-driven, inside-out filtration method.
- Liquid Inflow
The liquid to be filtered enters through the inlet at the top of the filter housing and goes directly into the interior of the filter bag.
- Pressure Interception
Driven by system pressure, the liquid passes through the filter bag from the inside to the outside. Solid particles, impurities, and suspended solids are completely trapped inside the bag.
- Clean Liquid Outflow
The filtered clean liquid passes through the metal support basket and exits through the outlet at the bottom or side of the filter housing.
Sealing Method of Filter Bags (For Needle-punched Felt Filter Bags)
Hot-Melt Welding Process
Employs advanced ultrasonic hot-melt welding technology to ensure superior seam strength and sealing performance, effectively preventing bypass leakage while enhancing filtration efficiency and product reliability.
Stitched Seam Process
Utilizes a high-strength five-thread overlock stitching process for secure, durable seams. Uses specialized sewing thread free of silicone lubricants to avoid the silicone contamination and secondary pollution issues often associated with standard stitched filter bags.
Optional Rings
The filter bag top can be flexibly equipped with stainless steel rings, galvanized steel rings, or high-strength engineering plastic rings according to different filter housing structures and sealing requirements. The ring collar is securely integrated with the filter bag body through high-strength hot-melt or ultrasonic bonding technology, ensuring firm attachment, deformation resistance, and fatigue durability. It enables tight sealing with the tube sheet, effectively preventing bypass leakage and dust emission, and is suitable for a wide range of industrial filtration systems and operating conditions.
Steel Ring
- Galvanized steel (stainless steel option).
- Sewn into the top of the bag.
- Cotton handle is standard with steel ring configuration.
- Designed to gasket as well as support and secure filter bag when placed into housing.
Plastic Ring
- Molded plastic with built-in handle makes installation and disposal faster, cleaner and less expensive.
- Just drop into housing and push down.
- Smooth plastic designs prevent build-up of contaminants around header.
- Collar is sewn or welded into place to ensure that plastic media remain firmly intact.
Draw String
- Adjustable top diameter to make easy tie on to piping.
- Great for gravity feed applications.
- Easy disposal.
- Economical filter applications.
Comparison of Filter Media Performance
| Material | Maximum Operating Temperature (°C) | Micron Rating (μm) | Abrasion Resistance | Weak Acid Resistance | Strong Acid Resistance | Weak Alkali Resistance | Strong Alkali Resistance |
|---|---|---|---|---|---|---|---|
| Nylon (PA / NMO) Mesh | 135–149 | 5, 10, 25, 50, 100, 150, 200, 300, 400, 500, 600, or 5-2000um | Excellent | Normal | Poor | Excellent | Excellent |
| Polyester (PE) needle-punched felt | 135–162 | 0.5, 1, 3, 5, 10, 25, 50, 75, 100, 125, 150, 200, 250, 300 | Very good | Very good | Good | Good | Poor |
| Polypropylene (PP) needle-punched felt | 93–104 | 0.5, 1, 3, 5, 10, 25, 50, 75, 100, 125, 150, 200, 250, 300 | Very good | Excellent | Excellent | Excellent | Excellent |
| PTFE needle-punched felt | 240–250 | 0.5, 1, 3, 5, 10, 25, 50, 75, 100, 125, 150, 200, 250, 300 | Very good | Excellent | Excellent | Excellent | Excellent |
Types of Standard Liquid Filter Bag (Accept Customization)
| Model | Filter area (m²/ pcs) | Volume (L) | Diameter | Length | ||
| cm | inch | cm | inch | |||
| Type 1 | 0.19 | 7.9 | 17.8 | 7 | 40.65 | 16 |
| Type 2 | 0.41 | 17.3 | 17.8 | 7 | 81.3 | 32 |
| Type 3 | 0.05 | 1.4 | 10.2 | 4 | 20.9 | 8.25 |
| Type 4 | 0.09 | 2.5 | 10.2 | 4 | 35.5 | 14 |
Application Industries
Micron filter bags are ubiquitous in industrial production due to their high efficiency and ease of replacement:
- Food & Beverage Processing
- Biotechnology & Pharmaceutical Industry
- Petrochemical & Chemical Processing
- Automotive Manufacturing
- Oil & Gas Industry
- Electronics & Electroplating
- Paints, Coatings & Inks
- Nuclear & Thermal Power Plants
- Waste Liquid Treatment
- Photographic Film Production
- Daily Chemical Industry
- Water Treatment Systems
- Textile, Dyeing & Printing Industry
- Paper Manufacturing
- Metal Processing Fluids
- Refrigeration & Cooling Systems