Aramid Needle-punched Felt for Dust Collection Filter Bags
Utilizing an innovative combination of multi-needle punching technology, gradient-density needle distribution, and three-dimensional cross-lapping processes, the filter media achieves a highly uniform, dense, and stable fiber structure. Combined with advanced nano-scale membrane coating technology, it delivers exceptional filtration performance with filtration accuracy down to 2 μm, filtration efficiency up to 99.998%, and dust cake release efficiency exceeding 80%, ensuring superior dust capture and easier cleaning.
Aramid needle felt is designed for continuous operation in temperatures ranging from 180°C to 204°C, with peak temperature resistance reaching 240°C–250°C. Even under prolonged exposure to 230°C, the thermal shrinkage remains at approximately 1%, providing excellent dimensional stability and resistance to deformation in high-temperature environments.
The aramid fiber possesses a Limiting Oxygen Index (LOI) of 30, making it inherently flame-retardant. It neither ignites spontaneously nor supports combustion and only begins to carbonize at temperatures around 400°C. In addition, the material exhibits good resistance to acidic and alkaline gases commonly found in industrial exhaust streams, ensuring reliable performance in demanding filtration applications.
Customized surface treatment solutions can be tailored to specific operating conditions, creating a synergistic combination of enhanced electrostatic dust capture, lower operating resistance, and improved dust release performance. Through fluid-dynamics-optimized design and the use of hydrolysis-resistant and oxidation-resistant composite materials, the filter media maintains a consistently low pressure drop, enabling filter bags to achieve an extended service life of 48 months or longer under continuous operating conditions.
Description
Product Introduction
Aramid needle-punched felt filter media (commonly known as Metamax® or Nomex® filter felt) are manufactured using high-quality meta-aramid (Aramid 1313) or polysulfonamide fibers through a precision gradient needle-punching process. Designed specifically for high-temperature applications, this high-performance industrial filtration material exhibits exceptional thermal stability during continuous operation. Furthermore, compared to fiberglass filter media, it offers superior mechanical strength, abrasion resistance, and resistance to flex fatigue, making it a cost-effective, high-performance solution for demanding high-temperature environments and complex flue gas filtration.
As a manufacturer of premium needle-felt filtration materials, Filmedia® leverages extensive industry experience and a team of technical experts to gain a deep understanding of filtration requirements across diverse operating conditions. We provide scientifically sound, practical, and reliable filtration solutions tailored to our customers’ specific applications. Our comprehensive technical support—encompassing material selection, product design, and process optimization—aims to enhance filtration efficiency, extend product service life, and reduce overall operating costs.
Technical Specifications (Meta-Aramid Needle Felt)
We can precisely match and customize specifications—including basis weight, thickness, base fabric type, and finishing processes—based on the client’s operating conditions and dust collector parameters.
| Weight（gsm） | 500 | ||
| Thickness(mm) | 2.4 | ||
| Width(m) | ≤2.2 | ||
| Finish treatment | PTFE impregnation | ||
| Air permeability(L/m2.s) | 200-300 | ||
| Tensile strength(N/5cm) | warp | 1300 | |
| weft | 1500 | ||
| Tensile elongation(%) | warp | 8 | |
| weft | 8 | ||
| Heat shrinkage(%) | warp | ≤1.5 | |
| weft | ≤1.0 | ||
| Temperature(°C/°F) | Continue | 240 | |
| Instant | 280 | ||
| Anti-acid | Good | ||
| Anti-alkali | Good | ||
| Anti-abrasion | Good | ||
| hydrolysis stability | Middle | ||
Post-processing for Aramid Needle-Punched Felt
To enhance the filtration performance, dust-cleaning efficiency, and service life of aramid needle-punched felt filter media in high-temperature flue gas environments, various surface treatments and finishing processes are applied based on specific operating conditions.
☑ Singeing
Uses a high-temperature flame to rapidly burn off surface fuzz and loose fibers from the filter material.
- Reduces dust embedding within the fiber layer
- Lowers operating resistance
- Improves surface smoothness
- Enhances dust-cleaning efficiency
☑ Calendering
Subjects the filter material surface to a calendering process using high-temperature, high-pressure rollers.
- Makes the filter surface flatter and denser
- Reduces dust penetration
- Improves filtration precision
- Enhances surface filtration capability
☑ PTFE Impregnation
Impregnating the fibers—both internally and on the surface—with a polytetrafluoroethylene (PTFE) emulsion.
- Improves resistance to acid and alkali corrosion
- Lowers fiber surface energy
- Enhances dust release properties
- Extends filter bag service life
☑ PTFE Membrane Lamination
Laminating a microporous PTFE membrane onto the surface of the filter medium.
- Enables surface filtration
- Achieves sub-micron filtration precision
- Increases capture efficiency for PM2.5 and ultrafine dust
- Facilitates more thorough dust cleaning
- Lowers emission concentrations
☑ Water & Oil Repellent Treatment
Impregnation using special finishing agents, such as fluorocarbon resins.
- Prevents water vapor and oil mist from penetrating the filter medium
- Reduces the risk of condensation-induced blinding (caking)
- Minimizes dust agglomeration
- Improves operational stability in humid conditions
☑ Anti-static Treatment
Incorporating conductive fibers into the filter medium or applying a conductive coating. Suitable for handling flammable or explosive dusts, such as pulverized coal, carbon black, and chemical powders
- Rapidly dissipates static charges
- Prevents static electricity accumulation
- Reduces the risk of spark discharge
☑ Aramid-Fiberglass Composite Felt
Constructed by combining aramid fibers with a fiberglass base fabric or fiberglass needle-punched felt. Suitable for operating conditions involving high filtration velocities.
- Higher mechanical strength and tensile properties
- Excellent abrasion and flex resistance
- Good dimensional stability
- Lower operating resistance
- Excellent dust release properties
- Extended service life
Industrial Applications
Aramid needle-punched felt is widely used in dust collection filter bags for industrial dust removal and flue gas purification systems operating under conditions of continuous high temperatures and fluctuating process parameters.
- Asphalt Mixing Plants
The industry’s preferred filter medium—standard equipment across nearly all product lines—it effectively handles the high temperatures and highly adhesive dust associated with asphalt mixing.
- Building Materials and Mining
Cement kiln inlets/outlets, lime kilns, aggregate processing, and gypsum board production.
- Metallurgy and Iron & Steel
Blast furnace coal injection, sintering flue gas, coking plants, and non-ferrous metal smelting (copper, aluminum, lead, etc.).
- Chemicals and Energy
High-temperature flue gas emission monitoring and ultra-low emission retrofitting for industries such as carbon black manufacturing, plastics and chemicals, industrial drying furnaces, shipbuilding, and tobacco processing.