Polyester / PET Needle Punched Felt Filter Bag
Polyester needle punched felt filter bags from LYH fit cement plants, woodworking lines, metal grinding, food processing, and general industrial dust collection. Buyers choose polyester filter bags when they need reliable filtration efficiency, stable dimensions, strong abrasion resistance, and cost-effective service life under continuous operation up to 135 °C.
We supply polyester / PET needle felt filter bags from China with custom size discussion, surface treatment options (singeing, glazing, PTFE membrane, anti-static, water & oil repellent), and project-based packing support. If your project requires a specific bag diameter, length, top/bottom construction, or emission target, we can review the RFQ and match the supply to your dust collector.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Material | 100% PET / Polyester staple fiber, scrim-supported needle felt |
| Continuous Operating Temperature (Dry) | 135 °C / 275 °F |
| Continuous Operating Temperature (Moist) | 130 °C / 266 °F |
| Maximum Short-Term Surge Temperature | 150 °C / 302 °F |
| Specific Density | 1.38 g/cm³ |
| Moisture Regain (20 °C, 65% RH) | 0.4% |
| Standard Fabric Weight | 500 / 550 / 600 / 650 GSM (customizable) |
| Air Permeability | 12–18 m³/m²/min @ 200 Pa |
| Tensile Strength (Warp / Weft) | ≥ 1,000 N / 5×20 cm |
| Filtration Efficiency | ≥ 99.9% (with PTFE membrane: ≥ 99.99%) |
Material Properties
Excellent Mechanical Strength & Abrasion Resistance — High-tenacity PET fibers withstand high pulse-cleaning frequencies and high air-to-cloth ratios without tearing or fiber migration.
Outstanding Dimensional Stability — Heat-set during manufacturing; the felt holds its shape on the cage and maintains stable filtration area throughout service life.
Good Chemical Resistance — Resistant to most mineral acids, organic acids, and weak alkalis at ambient temperature; not recommended for high-concentration nitric / sulfuric acid or strong alkalis at elevated temperatures.
Low Moisture Absorption — 0.4% regain ensures stable airflow and minimal caking in mildly humid environments.
Cost-Effective General-Purpose Solution — The best price-performance ratio of any baghouse filter media; the default choice for ambient and moderate-temperature applications.
Available Surface Treatments
| Treatment | Function | Recommended For |
|---|---|---|
| Singeing (SIPE) | Removes loose surface fibers via flame; improves cake release | Standard dry dust |
| Calendering / Glazing (GLPE) | Heated rollers densify the surface; enhances surface filtration | Fine-particle capture |
| Heat Setting | Stabilizes felt dimensions, eliminates residual shrinkage | All applications |
| PTFE Membrane Lamination | Microporous ePTFE membrane laminated on dust side; emissions ≤ 5 mg/Nm³ | Ultra-low emission compliance |
| Water & Oil Repellent (WO) | PTFE-based bath finish; repels moisture and oil | Humid, oily, sticky dust |
| Anti-Static | Conductive carbon fiber or stainless-steel filament; surface resistance 10³–10⁸ Ω·cm | Combustible / explosive dust |
| Flame Retardant (FR) | FR fiber or finishing; reduces ignition risk | Woodworking, welding, metal grinding |
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 — finish-mill venting, packing, transfer points
- Woodworking & Furniture — sawdust, sander dust, MDF processing
- Metalworking — grinding, cutting, shot blasting, welding fume
- Food Processing — flour, sugar, starch, spray-dryer powder
- Pharmaceuticals & Chemicals — ambient-temperature powder handling
- Mineral Processing & Mining — crushing, screening, conveying
- Foundry — sand reclamation, shake-out
- Power Plants — coal handling, fly-ash reinjection (low-temp zones)
- Plastics & Rubber — compounding, pelletizing, mixing
- Asphalt Mixing — drum dryer secondary collection (with WO finish)
Why Choose LYH Polyester Filter Bags
- Premium PET fiber sourced from leading producers; scrim-supported felt for stability and efficiency
- Strict QC on fabric weight, air permeability, tensile strength, bursting strength
- 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 dust, temperature, and emission target
- Reliable logistics — individually wrapped, ring-up packing, sea / air / courier shipment worldwide
FAQ
Q1: What is the maximum operating temperature of polyester filter bags? 135 °C (275 °F) continuous, 150 °C short-term peak. For sustained operation above 135 °C, consider PPS, P84, aramid (Nomex), or fiberglass.
Q2: Are polyester filter bags suitable for humid gas streams? Moderately — polyester is subject to hydrolytic degradation under combined high temperature and humidity. For consistently humid streams, choose acrylic or PPS, or specify polyester with a water & oil repellent finish.
Q3: Can polyester filter bags be used for combustible dust? Yes, with anti-static treatment specified. For high ignition risk (woodworking, metal grinding, fireworks), additionally specify a flame-retardant finish.
Q4: What treatment should I choose for ultra-low emission compliance (≤ 10 mg/Nm³)? A PTFE-membrane laminated polyester filter bag — emissions ≤ 5 mg/Nm³, longer bag life, lower differential pressure.
Q5: What information do I need to provide for a quote? (1) bag dimensions, (2) top/bottom construction, (3) operating temperature & humidity, (4) dust type & concentration, (5) chemical/corrosive components, (6) emission requirement, (7) quantity. A drawing or sample bag is even better.
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