Polyester Filter Bags for Liquid Filtration
Polyester needle felt filter bags are widely used in water treatment, chemical processing, metalworking, food and beverage production, and industrial fluid filtration due to their excellent mechanical strength, high dirt-holding capacity, and cost-effectiveness. Their three-dimensional depth filtration structure ensures efficient particle retention and extended service life, making them one of the most commonly used filter media for industrial liquid filtration applications.
Description
Base Fabric Material – Polyester Needle Felt
☑ Deep filtration structure effectively captures particulate impurities of various sizes.
☑ High dirt-holding capacity, high flow rate, and low pressure drop.
☑ High mechanical strength; resistant to deformation or damage.
☑ Surface treated with singeing and calendering to minimize fiber shedding.
☑ Filtration ratings available from 1 to 200 microns.
☑ Economical and practical; suitable for high-flow pre-filtration and medium-to-coarse filtration applications.
Technical Specifications
| Item | Specification |
|---|---|
| Material | Polyester Fiber |
| Filtration Rating | 1–200 μm |
| Continuous Operating Temperature | ≤130°C |
| Peak Temperature | ≤150°C |
| Acid Resistance | Good (Weak Acids) |
| Alkali Resistance | Moderate |
| Filtration Mechanism | Depth Filtration |
| Surface Treatment | Singeing, Calendering, Heat Setting |
Notes:
As polyester materials are susceptible to strong alkalis and high-temperature hydrolysis, they are not recommended for use in:
- Strong alkaline solutions.
- Long-term high-temperature liquid filtration.
- Strong oxidizing chemicals.
Manufacturing Process
Filmedia® subjects its filter media to various special treatments to meet industrial filtration requirements.
☑ Controllable Filtration Precision
By adjusting the thickness of the needle-punched felt, the filter bags can achieve higher filtration precision, typically delivering a removal rate exceeding 90%.
☑ Surface Post-Treatment
The filter bag surface undergoes singeing, calendering, and membrane lamination processes to effectively prevent fiber shedding (fiber migration).
Filtration Precision
| Micron Rating(μm) | Weighr(gsm) | Thickness(mm) | Airpermeabillty/d㎡/min | Tenslle strength Warp(N) | Tenslle strength Weft(N) | Break Elongation warp | Break Elongation weft |
| 1 | 550 | 2.2 | 120 | 900 | 1100 | 50% | 50% |
| 5 | 400 | 2.2 | 150 | 700 | 850 | 50% | 50% |
| 10 | 400 | 2.2 | 180 | 700 | 850 | 50% | 50% |
| 25 | 400 | 2.2 | 300 | 700 | 850 | 50% | 50% |
| 50 | 320 | 2.2 | 700 | 500 | 600 | 50% | 50% |
| 100 | 320 | 2.2 | 1200 | 500 | 600 | 50% | 50% |
| 200 | 320 | 2.2 | 1500 | 500 | 600 | 50% | 50% |
Common Size Specifications
| Filter Bag Size | Diameter × Length (mm) | Flow Rate (m³/h) | Filtration Area (m²) | Volume (L) |
|---|---|---|---|---|
| Size 1 | 180 × 410 | 20 | 0.25 | 8 |
| Size 2 | 180 × 820 | 40 | 0.50 | 17 |
| Size 3 | 100 × 230 | 10 | 0.15 | 1.3 |
| Size 4 | 100 × 420 | 18 | 0.20 | 2.5 |
| Size 5 | 152 × 520 | 12 | 0.18 | 8 |
Ring Materials
Liquid filter bags are available with various collar ring options to meet different housing requirements:
Steel Ring
- Stainless Steel Ring
- Galvanized Steel Ring
Plastic Ring
- Polypropylene (PP) Ring
- Polyethylene (PE) Plastic Ring
Sealing Process
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.
Typical Applications
- Industrial circulating water filtration
- Cooling water filtration
- Wastewater treatment systems
- Reverse osmosis (RO) pretreatment
- Chemical raw material filtration
- Resin filtration
- Paint and ink filtration
- Process liquid purification
- Cutting fluid filtration
- Grinding fluid filtration
- Cleaning solution filtration
- Electroplating solution pre-filtration
- Syrup filtration
- Juice pre-filtration
- Edible oil filtration
- Fermentation liquid clarification
- Lubricating oil filtration
- Hydraulic oil filtration
- Industrial fluid purification