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| A composite filter material is formed by laminating PTFE microporous membrane (ePTFE) on the surface of polyester needled felt substrate (temperature resistance ≤130℃), which combines the economy of polyester with the surface filtration accuracy (0.3μm) of PTFE membrane. | |||||||||
Alternative Names and Product Positioning
Alternative names:
Polyester-coated filter bags, three-proof (waterproof, oil-proof and anti-static) coated filter bags, medium-temperature coated fabric bags, PTFE-coated polyester filter bags.
Product positioning
A composite filter material is formed by laminating PTFE microporous membrane (ePTFE) on the surface of polyester needled felt substrate (temperature resistance ≤130℃), which combines the economy of polyester with the surface filtration accuracy (0.3μm) of PTFE membrane. Designed specifically to address the demands of high humidity, sticky dust and ultra-low emissions, it is the preferred solution for upgrading and transformation in industries such as cement, food and pharmaceuticals.
Core Features
Performance composite advantages
The composite effect of the parameter base material (polyester) and film coating (PTFE)
Temperature resistance: ≤130℃, 240℃, ≤130℃ (limited by substrate)
Filtration accuracy: 5-10μm, 0.3μm, 99.99% @ ≥0.3μm
The air permeability is 12 to 35 m³/m²·min and 100 to 200 L/m²·s. Surface filtration reduces resistance by 30%
Medium hydrophobicity (post-treatment required), natural hydrophobicity (contact Angle >110°), water repellent and oil repellent, no treatment required
Functional expansion
Anti-static type: Carbon fiber conductive strips are implanted, with surface resistance ≤10⁹Ω (in compliance with GB/T 3836);
Enhanced sealing: The bag opening is wrapped with a silicone ring or polyurethane edge, and the air tightness is increased to 99.5%.
Wear-resistant design: Thickened layer or anti-wear ring at the bottom of the bag, extending the service life by 40%.
Typical Application Scenarios
Solutions to challenges in core industry scenarios
The flue gas and slag micro-powder at the tail end of the cement production kiln are filtered for high humidity (>60%) and condensation risk. The bag is coated with anti-clogging film and has water-repellent characteristics
GMP clean requirements for flour and starch dust recovery in food processing + explosion-proof PTFE coating + anti-static conductive strips
In the pharmaceutical industry, the collection of raw material drug dust without silicone oil contamination requires hot melt sewing and medical-grade lamination
Biomass power plant boiler tail gas dust removal sticky fly ash + humidity fluctuation smooth coated surface anti-adhesion
Chemical plastic granulation flue gas oily dust + normal temperature oil-repellent film coating + anti-static
Contraindications: Working conditions with temperature > 130℃ (the base material polyester will shrink), strong oxidizing environment (such as ozone concentration > 10ppm).
Product Advantages (Compared with Ordinary Polyester Filter Bags)
Ultra-low emissions: Emission concentration ≤10mg/m³ (national standard ≤30mg/m³), meeting the new environmental protection regulations;
Economic and energy-saving
The resistance is stabilized at 800 to 1000Pa (1200 to 1500Pa for ordinary filter bags), and the energy consumption of the fan is reduced by 25%.
The service life is 3 to 5 years (1.5 to 2 years for ordinary filter bags), and the maintenance cost is reduced by 40%.
Maintenance-free design: The PTFE membrane does not adhere to dust, extending the dust cleaning cycle by 50%.
Safety and compliance: Certified by FDA (Food), GMP (Pharmaceutical), and ATEX (explosion-proof).
Customization Process
Demand Matching (3 to 5 days
Provided: flue gas temperature/humidity, dust composition (such as oil content), target emission value, flower plate hole size (such as φ160mm).
Scheme Design (1-2 weeks)
Structural customization
Coating type: Conventional microporous film (0.3μm) or gradient film (anti-condensation);
Bag opening/bottom: Silicone sealing ring, anti-collapse ring, anti-wear band.
Optional functions: Anti-static conductive strips, fireproof stitching.
Sample verification (2 weeks)
Sample bag production → 0.3MPa sealing test → On-site bag hanging (to verify the ash cleaning effect and resistance).
Batch delivery (3 to 4 weeks
Fully automatic laminating production line (film-substrate composite strength ≥8N/cm) → hot melt sewing → vacuum anti-pressure packaging.
Quality Inspection Process (in Accordance with GB/T 6719-2009)
Raw material inspection
Polyester base fabric: Weight 500±50g/㎡, thickness 1.8±0.2mm;
PTFE membrane: Pore size distribution (bubble point method ISO 4003,0.3 μm±0.05μm), porosity ≥85%.
Lamination process monitoring
Peel strength: ≥8N/cm (ASTM D903 standard);
Composite uniformity: No bubbles or delamination detected by a light transmittance meter.
Finished product testing
Standard method qualification indicators for test items
Filtration efficiency ISO 16890 ≥99.99% @ 0.3μm
The air permeability of ISO 9237 after coating is 1.5 to 5 m³/m²·min
Anti-static property: GB/T 12703.1 Surface resistance ≤10⁹Ω
Acid and alkali resistance: ISO 5630 10% H₂SO₄/NaOH immersion for 72 hours, strength retention ≥90%
The sealing property is EN 1434. The leakage rate is ≤0.5% after being held at 0.3MPa for 1 hour
Factory release and annual inspection
Each batch is randomly inspected at 10%, and the annual inspection includes a high-temperature and humid heat cycle test (70℃/95%RH, no stratification for 48 hours).
