Acrylic Needle Punched Felt Filter Bag
Acrylic needle punched felt filter bags from LYH fit cement plants, asphalt mixing, coal-fired boilers, lime kilns, and dust collection in moist or hydrolysis-prone environments. Buyers choose acrylic filter bags when they need superior hydrolysis resistance, dependable heat tolerance up to 125 °C in moist conditions, and stable long-term performance where polyester would degrade.
We supply acrylic filter bags from China with custom size discussion, fabric weight options (450–550 GSM), and full surface treatment support. If your project requires a specific bag diameter, length, top/bottom construction, or moisture / acid resistance match, we can review the RFQ and pair the right acrylic felt to your dust collector.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Material | 100% Homopolymer Acrylic staple fiber, scrim-supported needle felt |
| Continuous Operating Temperature (Dry) | 125 °C / 257 °F |
| Continuous Operating Temperature (Moist) | 125 °C / 257 °F |
| Maximum Short-Term Surge Temperature | 140 °C / 284 °F |
| Specific Density | 1.17 g/cm³ |
| Moisture Regain (20 °C, 65% RH) | 1.0% |
| Standard Fabric Weight | 450 / 500 / 550 GSM (customizable) |
| Air Permeability | 12–18 m³/m²/min @ 200 Pa |
| Tensile Strength (Warp / Weft) | ≥ 900 N / 5×20 cm |
| Filtration Efficiency | ≥ 99.9% (with PTFE membrane: ≥ 99.99%) |
Material Properties
Outstanding Hydrolysis Resistance — Acrylic fiber has exceptional resistance to hydrolytic degradation, far surpassing polyester in moist or saturated gas streams. This makes it the preferred choice for flue gas and dust streams with elevated humidity or acid dew point conditions.
Excellent Moist-Heat Performance — Unlike polyester (which loses strength rapidly above 110 °C in moist conditions), acrylic maintains stable mechanical properties at 125 °C continuous service in both dry and moist environments.
Good Acid & Mild Chemical Resistance — Acrylic exhibits excellent resistance to mineral and organic acids at moderate concentrations, making it suitable for sulfur-containing flue gas and acidic dust streams.
Superior Cost-to-Performance Ratio for Mid-Temperature — Filling the gap between polyester (135 °C dry only) and PPS (190 °C), acrylic delivers reliable mid-range temperature performance at a significantly lower cost than PPS or P84.
Stable Dimensional Behavior — Acrylic felt resists shrinkage and deformation under prolonged thermal exposure, ensuring consistent bag-to-cage fit over the service life.
Limitations to Note — Acrylic is not recommended above 125 °C continuous service or in strong alkali environments. It is also subject to oxidation by strong oxidizing agents at elevated temperatures.
Available Surface Treatments
| Treatment | Function | Recommended For |
|---|---|---|
| Singeing | Removes loose surface fibers via flame; improves cake release | Standard moist / acidic dust |
| Calendering / Glazing | Heated rollers densify the surface; enhances surface filtration | Fine-particle capture, low pressure drop |
| Heat Setting | Stabilizes felt dimensions, eliminates shrinkage during operation | All applications |
| PTFE Membrane Lamination | Microporous ePTFE membrane on dust side; emissions ≤ 5 mg/Nm³ | Low-emission compliance, fine PM capture |
| Anti-Static | Conductive carbon fiber or stainless-steel filament; surface resistance 10³–10⁸ Ω·cm | Combustible dust in moist streams |
| Water & Oil Repellent (WO) | Enhanced moisture and oil rejection finish | Sticky, oily, or saturated streams |
Bag Construction
- Top Constructions — Snap band, flange top, ring top, soft cuff, raw edge, strap top
- Bottom Constructions — Disc bottom, flat bottom, reinforced double-bottom, wear-strip bottom
- Sewing — 3-needle chain stitch with PTFE or polyester thread; overlock or lockstitch on bottoms
- Reinforcement — Optional wear strips, custom skirts, double-bottom reinforcement for abrasive dust
Standard Sizes & Customization
| Dimension | Range |
|---|---|
| Diameter | Φ100 / 120 / 125 / 130 / 150 / 160 / 180 / 250 mm (or custom) |
| Length | 1,000 – 8,000 mm (custom lengths available) |
| Tolerance | Diameter ± 2 mm, Length ± 5 mm |
Non-standard sizes, special top/bottom configurations, and OEM patterns produced from your drawings or sample bag.
Industry Applications
- Cement & Building Materials — kiln tail, raw mill, clinker cooler with humid exhaust
- Asphalt Mixing Plants — drum dryer baghouse, hot-mix asphalt production
- Coal-Fired Industrial Boilers — flue gas dust collection with moderate sulfur content
- Lime & Gypsum Plants — kiln exhaust, calcination dust
- Carbon Black Manufacturing — secondary dust collection
- Coal Drying & Briquetting — moist coal handling
- Power Generation — boiler economizer zones, low-temperature flue gas
- Drying Equipment — spray dryer, fluid bed dryer with moist exhaust
- Iron & Steel — sintering plant dedusting (low-temp zones)
- Non-Ferrous Smelting — flue gas with acid dew point risk
Why Choose LYH Acrylic Filter Bags
- Premium homopolymer acrylic fiber — superior hydrolysis resistance compared to copolymer alternatives
- Strict QC on fabric weight, air permeability, tensile strength, hydrolysis stability
- Full customization — any size, any top/bottom, any treatment combination
- Fast lead time — standard sizes ship in 10–20 days
- Engineering support — application engineers help match media to your moisture, temperature, and acid dew point conditions
- Reliable logistics — individually wrapped, ring-up packing, sea / air / courier shipment worldwide
FAQ
Q1: What is the maximum operating temperature of acrylic filter bags? Acrylic filter bags operate continuously at up to 125 °C (257 °F) in both dry and moist conditions, with short-term peaks up to 140 °C. For sustained operation above 125 °C, consider PPS, P84, or aramid (Nomex) alternatives.
Q2: Why choose acrylic over polyester? Acrylic has dramatically better hydrolysis resistance and stable performance in moist heat. Where polyester degrades rapidly under combined high temperature and humidity, acrylic maintains mechanical strength and dimensional stability — making it the preferred choice for cement, asphalt, coal-fired, and other moist exhaust applications.
Q3: How does acrylic compare to PPS? PPS offers higher temperature tolerance (190 °C) and better resistance to harsh chemicals, but at significantly higher cost. Acrylic is the cost-effective mid-temperature solution (up to 125 °C) when extreme heat or aggressive chemistry is not required.
Q4: Is acrylic suitable for acidic flue gas? Yes. Acrylic has good resistance to mineral and organic acids at moderate concentrations and is well-suited for sulfur-containing flue gas in cement, lime, and coal-fired applications below 125 °C.
Q5: Can acrylic filter bags be PTFE-coated or anti-static? Yes. PTFE membrane lamination is available for ultra-low emission requirements. Anti-static treatment with carbon fiber or stainless-steel filament is available for combustible dust environments.
Q6: What information do I need to provide for a quote? (1) bag dimensions, (2) top/bottom construction, (3) operating temperature & humidity, (4) acid dew point or sulfur content, (5) dust type & concentration, (6) emission requirement, (7) quantity. A drawing or sample bag is even better.
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