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GUANLIN PTFE membrane coated polyester filter bags, 130°C temperature resistance, for woodworking, cement and chemical fine dust surface filtration.
PTFE membrane laminated polyester needle felt filter bags delivering true surface filtration for sub-micron particulate, near-zero emission and easy dust cake release in woodworking, cement, chemical and powder processing baghouses.
Description
A conventional needle felt filters inside its depth: dust penetrates the fibre matrix, embeds, and slowly blinds the media. A PTFE membrane changes that. A microporous PTFE film is laminated to the felt surface, so all filtration happens on a thin, non-stick skin. Dust never enters the felt, cleaning is near-complete, and emissions drop to levels plain felt cannot reach.
Why Choose GUANLIN PTFE Membrane Filter Bags
- True surface filtration — the microporous PTFE film stops particles at the surface instead of letting them embed in the felt.
- Sub-micron capture — membrane pore size delivers ≥99.99% efficiency for particles below 1 μm, supporting ultra-low emission limits.
- Near-complete dust release — the non-stick membrane lets the cake fall away cleanly, so pressure drop stays low and stable.
- Longer service life — no internal blinding means cleaning cycles stay effective for the whole bag life.
- Stable 130°C service — polyester base media rated 130°C continuous, 150°C peak.
- Chemical inertness at the surface — PTFE resists acids, alkalis and solvents that would attack bare polyester.
- Custom sizing — Ø115–200 mm × 1000–6000 mm to your drawing.
- Matched cages available — bags and support cages supplied as a set.
Application Scenarios
Woodworking and furniture manufacturing
Fine sanding dust below 10 μm is the hardest fraction to capture and the easiest to embed in felt. The membrane keeps it on the surface, so the bag cleans fully and extraction airflow stays stable across the shift.
Cement and mineral processing
Where local emission limits demand single-digit mg/m³, the membrane delivers the efficiency plain needle felt cannot, while the non-stick surface handles the alkaline dust that otherwise hardens on the bag.
Chemical and pigment powder handling
Fine pigments, toners and chemical powders penetrate standard felt and permanently stain it. Surface filtration prevents penetration and allows full recovery of the product dust.
Pharmaceutical and food processing
Where product recovery and hygiene matter, the smooth inert membrane surface resists build-up and supports clean-out between campaigns.
Metal powder and shot blast extraction
Sub-micron metal fume and fine abrasive dust are captured on the membrane rather than embedding in the felt, reducing both emissions and maintenance.
Waste transfer and recycling
Mixed fine dust with variable moisture is handled by the non-stick surface, which prevents the mud-layer blinding common with untreated felt.
Applicable Working Conditions
- Continuous gas temperature ≤130°C (266°F), short-term peak ≤150°C (302°F)
- Fine and sub-micron particulate requiring surface filtration
- Sticky, oily or pigment-loaded dust benefiting from non-stick release
- Pulse jet cleaning with tight emission limits
Product Specifications
| Item | Specification |
| Filter Media | Polyester needle felt with laminated PTFE membrane |
| Basis Weight | 500 g/m² + membrane |
| Continuous Operating Temperature | 130°C (266°F) |
| Max Short-Term Temperature | 150°C (302°F) |
| Filtration Type | Surface filtration |
| Dust Removal Efficiency | ≥99.99% for sub-micron particles |
| Diameter | Ø115–200 mm |
| Length | 1000–6000 mm |
| Top Construction | Snap band / flange / buckle / sewn |
| MOQ | 10 pcs |
| Lead Time | 7–15 days |
Performance Comparison
Compared with plain polyester needle felt, the membrane version typically reduces clean-bag pressure drop by 30–50%, extends cleaning intervals, and lowers outlet dust concentration by an order of magnitude. The trade-off is a higher unit price, which is normally recovered within the first cleaning cycle reduction.
Packaging & Logistics
- Inner: individual polybag with membrane protection sheet
- Outer: 5-ply export carton or woven bag
- Handle with care — avoid folding the membrane surface sharply
- EXW / FOB Shenzhen or Guangzhou / CIF
FAQ
Q1. What is a PTFE membrane filter bag?
A needle felt filter bag with a microporous PTFE film laminated to its surface, so filtration happens on the film rather than inside the felt.
Q2. Why is it better than plain needle felt?
Higher efficiency, lower and more stable pressure drop, better dust release and longer life, because dust never embeds in the felt.
Q3. Does the membrane peel off?
No — it is laminated under heat and pressure; normal pulse cleaning does not delaminate it.
Q4. What is the maximum temperature?
130°C (266°F) continuous, 150°C short-term peak.
Q5. Can it capture sub-micron dust?
Yes, the membrane delivers ≥99.99% efficiency for sub-micron particles.
Q6. How should it be handled?
Avoid sharp folding or dragging the membrane surface during installation.
Q7. What is the MOQ and lead time?
MOQ 10 pcs, 7–15 days for standard sizes.
Key Specifications
- Media: polyester needle felt + laminated PTFE membrane
- Filtration: true surface filtration
- Temperature: 130°C continuous / 150°C peak
- Efficiency: ≥99.99% sub-micron
- Sizes: Ø115–200 mm × 1000–6000 mm
- MOQ: 10 pcs, 7–15 days
