• Our capacity: 20,000 per month (standard product).
  • Size: Customization Accepted.
  • Optional process: Sewing or hot welding.
  • Filtration precision: ≤30mg/m³ (laminating PTFE film, ≤5mg/m³).
  • Finish-treatment: Calendering, Heat setting, Singeing.


Polyester filter bag is the most common materials in the filter bag family. Polyester needle felt filter bags are made of needle punched many times and properly rolled. The short fibers are laid into a fiber web, and then the fiber web is reinforced into a cloth by needles with barbs, and the fiber web is repeatedly punctured to reinforce the fibers to form a needle-punched non-woven fabric. Non-woven fabrics have no distinction between warp and weft, the fibers are messy, and there is little difference in radial and weft properties. The air permeability of the polyester filter bag is more than 50% higher than that of the ordinary calendered filter material, the surface is smooth, the air permeability is good, and the resistance is low. The dust on the surface of the polyester filter bag is easy to fall off, which prolongs the dust removal cycle and service life of the filter bag.

Working Principle

The working principle of the polyester filter bag is the so-called “depth filtration” technology, that is, the “primary dust layer” (powder filter cake) is formed on the surface through the capture of the filter material fibers, and then the subsequent dust is filtered out through the powder filter cake. During the initial use of the polyester filter bag, due to its own large gap, some dust will be discharged through the filter material. Only when the powder cake is formed can the filtration process actually begin. After continuous use, the dust on the surface of the polyester filter bag will gradually penetrate into the filter material, causing the pores of the filter material to be blocked, increasing the running resistance of the equipment until the filter material must be replaced.

In The Non-Woven Category, Pet (Polyester) Needle-Punched Non-Woven Material Has The Following Characteristics:

  • High Strength.
  • Good High Temperature Resistance (Can Be Used For A Long Time In An Environment Of 150°C).
  • Anti-Uv.
  • High Elongation.
  • Good Air Permeability.
  • Preservative.
  • Sound Insulation.
  • Mothproof.
  • Non-Toxic.


Steel plants, cement plants, coal handling systems in power plants, etc.

The main advantages and features  of Polyester Filter Bag in Filmedia®

  • To increase system filtration capacity by 50-150% as needed without major changes to the dust collectors ;
  • System cleaning efficiency markedly increased with the effective increase of bag to bag distance;
  • Bag life extended due to significant reduction of fatigue damage to the bags due to bag to cage impact.


Specification of Polyester Filter Bag

Heat resistance℃/℉ up to 130/266
Fabric 100% polyester
Length & diameter No limited
Area weight (g/m2) 350~650
Working lifetime 8000 hours and more
MOQ 50pcs

Physical properties

Air permeability(L/m2.s) @200pa Tensile strength(N/5cm) Temperature(℃/℉)
warp weft continue instant
200~300 1300 1500 130/266 150/302

Chemical properties

Acid Resistance Alkali Resistance Hydrolytic Resistance Oxidation Resistance Abrasion resistance
Moderate Moderate Poor Good Excellent



For polyester filter bag, we can treat it with different post-processing according to different working conditions. There are mainly the following post-processing treatments:
1. Anti-Static (line type, cross line type, blend type).
2. Anti-Spark.
3. Water&Oil Repellent.
4. Anti-Abrasion (Acrylic coating).
5. PTFE Membrane.
6. PTFE Impregnation.

Shapes and Types

Polyester filter bags can be made into different shapes, which can be mainly divided into the following three types:
1. Round type.
2. Flat type.
3. Star/pleated type.

According to different working principles, polyester filter bags can also be made into the following three types:
1. Pulse jet filter bag.
2. Reverse air filter bag.
3. Shaker filter bag.


We Pay Attention to Every Processing Detail:

  • Accurately design the size of the filter cloth required for the filter bag. The filter cloth will be larger than the actual design size to leave enough operating space.
  • Choose the right filter bag accessories and check their quality.
  • We draw, cut and sew the filter bags on an automatic production line. When the filter bag needs to be processed manually, we open it on the operating platform and use a certain pulling force to keep it flat.
  • We maintain strict processing quality standards in accordance with design drawings and operating procedures. Our workers dress in compliance with safe construction requirements and are prohibited from smoking.



Qualifications of PE series products:  SGS of PE series products