The laminated polyester needle punched felt filter bag is a typical representative of surface filtration technology. It utilizes the microporous structure of PTFE film to achieve almost 100% dust barrier on the membrane surface, thereby achieving efficient, low resistance, and easy dust removal filtration effect.
Substrate: Polyester needle punched felt
Coating: ePTFE (expanded polytetrafluoroethylene) microporous film
Core features: Surface filtration, high precision, good dust removal effect
Working Principle:
Unlike traditional deep filtration media (where dust enters the interior), membrane filter bags use a surface filtration mechanism. Dust is trapped on the smooth surface of the membrane and cannot enter the interior of the filter fibers, forming a thin layer of "dust cake". This layer of dust cake is very easy to peel off as a whole during dust cleaning.
The common specifications and sizes of dust removal bags generally include the following sizes: diameter: 120, 130, 133, 155, 180, 200, 250, 292, 300mm, etc; The lengths include: 1000, 1500, 2000, 2400, 25000, 2480, 2800, 3000, 3200, 3600, 4000, 4400, 5000, 6000, 8000mm, etc
The commonly used specifications for circular cloth bags include Φ 133 * 1000, Φ 133 * 1500, Φ 133 * 2000, Φ 133 * 2500, etc., with Φ 133 * 2000 being the most commonly used.
If you need other sizes
| Item |
Typical Parameters |
Remarks |
| Weight |
450 - 550 g/m² |
Varies based on thickness and strength requirements |
| Thickness |
1.6 - 2.0 mm |
|
| Air Permeability |
≤ 15 L/m²·s |
Note: The air permeability of membrane filter media is much lower than conventional media, which is normal as its primary resistance comes from the membrane. |
| Continuous Operating Temperature |
≤ 130 °C |
|
| Maximum Instantaneous Temperature |
≤ 150 °C |
|
| Acid Resistance |
Good |
The polyester base material offers good resistance to acid and alkali at normal temperatures |
| Alkali Resistance |
Good |
|
| Post-Treatment Processes |
Singeing, Calendering, Heat Setting |
Ensures dimensional stability and improves surface smoothness |
The laminated polyester needle punched felt filter bag is suitable for working conditions that require efficient collection, strict emission requirements, high dust viscosity, or high moisture content.
Cement industry: dust collection for kiln head, kiln tail, clinker cooler, cement mill, etc.
Steel metallurgy: dust control for blast furnace coal injection, sintering, steelmaking, coking, and other processes.
Chemical industry: Recycling of powders such as carbon black, pigments, and plastics.
Food and Medicine: Collecting food additives such as flour, sugar powder, starch, etc. requires hygiene and high efficiency.
Wood processing: sawdust from sanding machines, particleboard, and furniture manufacturing.
Garbage incineration: treatment of flue gas at the tail of the boiler.
The laminated polyester needle punched felt filter bag solves the inherent problem of "deep clogging" of traditional filter materials through the technology of "replacing cloth with film". Although its initial investment cost is higher than that of ordinary polyester filter bags, its advantages such as low energy consumption, long lifespan, near zero emissions, and low maintenance costs make it a highly cost-effective choice in many environmentally demanding industrial fields.
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