Acrylic needle felt is one of the most commonly used materials for manufacturing filter bags and is frequently employed for gas filtration ranging from ambient to medium temperatures. In the field of industrial dust removal, there exists a specific “intermediate zone”—temperatures between 120°C and 160°C, often accompanied by mild acidic corrosion—where polyester materials lack sufficient heat resistance, while PPS materials prove prohibitively expensive. Dust filter bags fabricated from acrylic needle felt serve to precisely fill this critical gap.
Learn more about: Acrylic Filter Bags
Description
Acrylic needle felt is a kind of fine fiber fabric using non-woven needle punching technology. The acrylic fibers are arranged in a staggered manner, the gaps are evenly distributed and large, the air permeability is good, and the chemical resistance is stable. It can not only filter normal temperature gas, but also filter medium temperature gas (150°C), it is an ideal choice for filtering acid, alkali and corrosive gases. Compared with polyester needle felt, the biggest feature of acrylic is that it has better hydrolysis resistance than polyester needle felt.
- Excellent Air Permeability
The fabric features a smooth and uniform surface structure, allowing air to pass through بسهولة while effectively capturing dust particles. Its low tendency to clog helps maintain stable pressure drop and ensures long-term, efficient filtration performance.
- Strong Chemical Stability
Acrylic needle felt offers good resistance to acids, alkalis, and hydrolysis, making it suitable for humid and chemically aggressive environments. This stability ensures consistent performance even in flue gases containing corrosive components, extending the service life of the filter media.
Physical Properties and Chemical Properties
| Weight | 300-600g/m2 ± 10% | |
| Diameter | No limited | |
| Finish treatment | Singeing, Calendering, Heat setting | |
| Air permeability | l / m2 / s @200pa | 200 ~ 350 |
| Tensile strength (N/5cm) | Warp | 800 |
| Weft | 850 | |
| Tensile elongation (%) | Warp | 20 |
| Weft | 25 | |
| Temperature (℃/℉) | ||
| Continuos temperature | C° | 120/248 |
| Instant temperature | C° | 140/284 |
| Anti-acid | Excellent | |
| Anti-alkali | Excellent | |
| Anti-abrasion | Good | |
| Hydrolysis stability | Excellent | |
Post-treatment
Depending on specific application requirements, acrylic needle-punched felt can undergo various functional treatments.
- Heat Setting
Heat setting is a thermal stabilization process performed under controlled temperature and tension.
- Calendering
Calendering is a mechanical finishing process in which the fabric surface is pressed between heated rollers.
- Singeing
Singeing involves briefly exposing the fabric surface to a controlled flame or high-temperature source.
- PTFE Membrane Lamination
PTFE membrane lamination involves bonding a microporous PTFE membrane to the surface of the needle felt.
- Water & Oil Repellent Treatment
This chemical finishing process applies hydrophobic and oleophobic agents to the fiber surface.
- Anti-Static Treatment
Antistatic properties can be achieved by incorporating conductive fibers or coating with a conductive chemical coating.
Acrylic needle felt filter bags are widely used in industrial dust filtration.
Typical Applications
Filter bags made of acrylic needle punched felt are widely used in many industries:
- Waste Incineration
Effectively handles complex flue gases containing moisture, acidic components, and corrosive substances.
- Asphalt Plants
Suitable for high-humidity and organic fume conditions, ensuring reliable dust filtration.
- Spray Dryers
Performs well in environments with high moisture content and fine particulate matter.
- Coal Mills
Provides stable filtration under conditions with certain temperature fluctuations and dust loads.
- Power Plants
Applied in boiler flue gas treatment systems with relatively moderate temperature ranges.
- Cement Plants
Ideal for kiln tail and other sections where moisture and chemical corrosion may occur.
Filmedia® — China’s Leading Manufacturer of Advanced Filter Fabrics
Filmedia®, a leading manufacturer of filtration fabrics in China, specializes in the R&D and production of high-performance industrial filtration materials. This acrylic needle-punched felt is meticulously crafted from high-quality acrylic fibers using an advanced needle-punching process. Distinguished by its robust structure and exceptional filtration performance, the product is widely utilized in various applications involving the treatment of flue gas and dust within medium-to-low temperature environments.
