Polyester Filter Bags

Our polyester filter bags are widely used in general dust collection systems across industries like woodworking, grain processing, cement, metallurgy, and more. They offer excellent mechanical properties, stable filtration efficiency, and are ideal for medium-temperature applications.

High Strength & Durability – Polyester fiber provides excellent mechanical strength, extending service life even under frequent pulse cleaning cycles.
Cost Efficiency – As one of the most economical filter materials, polyester balances affordability with performance.
Consistent Filtration – Maintains stable air permeability and filtration efficiency across its lifespan.
Versatile Application – Suitable for various industries handling dry dust or low-moisture environments.
Customizable Options – Supports a range of finishing treatments and structural configurations.

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Technical Specifications

Parameter	Details
Material	100% Polyester Fiber
Weight	400-650 g/m²
Thickness	1.6-2.2 mm
Operating Temperature	≤150°C (302°F)
Air Permeability	10-20 m³/m²/min
Length&diameter	No Limited

We offer full customization to perfectly match your dust collection equipment needs.

polyester filter bag

Water and Oil Repellent Filter Bag

Anti-static bags

Polyester needle felt filter bags

Needle Felting Treatment

Polyester filter fabrics are widely used in cement, steel, power generation, asphalt, and chemical industries due to their excellent cost-performance ratio. To further enhance performance, we provide a series of advanced post-treatment processes that improve fabric durability, filtration efficiency, and adaptability to various working conditions.

Prevents shrinkage and stabilizes fabric structure at working temperatures.

Normal bags build up 30,000+ volts in high-velocity airflow. One spark → explosion.

We embed conductive stainless steel/carbon fibers throughout the felt. Volume resistivity ≤ 10⁶ Ω·cm – static dissipates in 0.3 seconds.

Adding an ePTFE membrane to a polyester filter bag allows the membrane to act as the filter cake. Dust stays on the surface of the membrane and does not get entrained into the fibers of the filter bag, which lengthens the life of your filter bag. It also reduces wear and tear, lower maintenance costs, and energy costs due to easy dust cake release during the cleaning cycle.

This coating adds resistance to water and oils, and improves cake release.

Singeing is a finishing process where the surface of the filter media is exposed to a flame or hot gas to burn off the fine and straggly fibers in order to provide a uniform and smooth surface area, which improves dusk cake release, enhanced filtration efficiency, and better air permeability.

The singeing process typically involves passing the fabric over an open flame or through a heated chamber. The heat singes off the protruding fibers without damaging the main structure of the fabric. The process parameters, such as speed and temperature, are carefully controlled to achieve the desired level of smoothness and finish.

Glazing, also known as calendering, is the high-pressure pressing of the fabric by rollers to flatten or smooth the surface. Glazing pushes the surface fibers down onto the body of the filter media to increase and uniform surface life, improve stability, reduce shrinkage, and improve dust cake release.

Anti-static Polyester Needle Felt

PTFE Membrane Laminated Polyester Felt

Waterproof polyester filter cloth

Flame-Retardant Filter Cloth

Lean Intelligent Manufacturing

We adopt high-performance fibers from world-renowned brands and conduct rigorous 13-item laboratory testing, including fiber composition, breaking strength, thermal shrinkage, and more.

Raw Material Selection

Raw fibers are precisely weighed and scattered by automatic equipment, then thoroughly opened and cross-blended in high-speed multi-chamber air mixing system. Fiber uniformity reaches over 98%, providing a stable foundation for high-quality needle felt production.

Mixing and Pretreatment

Equipped with German Autefa intelligent production lines, high-frequency high-speed needle punching machines, and imported Groz-Beckert needles, we achieve a high-speed web output of 100m/min through an 8-stage precision carding process.

Intelligent Spinning & Web Formation

Adopt multi-zone needle punching technology, combined with imported card clothing double cylinders. Precisely control punching depth and density to form a three-dimensional filtration structure.

Precision Needle Punching Molding

Stabilizes the fabric dimensions after processing, ensuring consistent fit, shrink resistance, and compatibility with bag cages.

Heat Setting

Singeing removes surface fuzz and loose fibers, preventing dust re-entrainment and improving cleaning efficiency. It creates a smooth surface ideal for pulse-jet cleaning systems.

Singeing Treatment

A PTFE or ePTFE microporous membrane is laminated onto the fabric surface to achieve ultra-fine filtration. It enables ≤5mg/m³ emission levels, reduces pressure drop, and significantly extends bag life.

Membrane Lamination

Chemical finishing forms a molecular film, repelling water/oil, retaining texture/breathability, wash & stain resistant.

water/oil repellency

Filter bag processing details

High quality seam designed for lowest emissions

Sewn, welded, with additional PTFE seam seal.

Top and Bottom Configurations

Available in various designs, including snap band, ring top, and flange top for easy installation and secure fitting.

Support Rings

Integrated support rings or other reinforcement structures to maintain bag shape and ensure optimal airflow.

Filter bag sewing technology

Pinhole Sealing Technology

Seamless Sewing Technology

TAP Lamination Technology

Advanced automatic bag body sewing equipment enables computer-adjustable sewing seam positions and stitch densities, along with fabric deviation correction and automatic stop upon thread breakage. It is also equipped with advanced technologies such as auxiliary pinhole sealing and film lamination to meet the requirements of ultra-low emissions.

Application

Asphalt Mixing Plants

Non-Ferrous Metals Plant Dust Collection

Steel & Metallurgy

Chemical & Mining

Power Generation

Waste Incineration

Renewable Energy Industry Dust Collection

New energy sector

Cement & Building Materials

pulp and paper industry

Related Products

We also provide various high-quality filter cages, filter bags, and other accessories to offer you a one-stop dust removal solution.

Custom Dust Filter Bag Solutions – Built Exactly for Your Process

No two plants are the same. That’s why we never offer off-the-shelf answers.
At Aokai, every filter bag is engineered specifically for your operating conditions: dust properties, gas temperature, chemical aggression, and emission targets.

Custom Dust Filter Bag Solutions – Built Exactly for Your Process

Fiber & Treatment: Choose PTFE, P84, Aramid, PPS, anti-static, PTFE membrane, or any blend
Construction: Triple-needle stitching, heat-sealed seams, ultrasonic welding – whatever delivers maximum durability
Fit & Design: Made to the exact millimeter, including special shapes, pleated bags, and integrated cage-bag designs

PTFE Filter Bags

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Polyester Filter Bags

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Custom Needle Felt Filter Media

Your dust, your conditions – your perfect felt.

Custom Needle Felt Filter Media

PTFE fabric

Aramid Fabric

Polyester Filter Cloth

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Galvanized Steel Filter Bag Cages

Stainless Steel Filter Bag Cages

Flat Filter Cage

filter bag cage for air dust collector 1

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Our Manufacturing Strength

Aokai Environtec is a leading manufacturer of baghouse filter cloth, filter bags, and baghouse accessories. Founded in 2004 and headquartered in China, our products are used in a variety of applications and industries, including asphalt mixing plants, cement plants, mining operations, power generation plants, metallurgy industry, renewable energy industry, waste incineration plants, and other industrial facilities. Our mission is to make the world a cleaner and better place by protecting people, the planet, and production from the harmful effects of industrial processes.

1

Years of Serving Customers

1

㎡ – Modern Production Base

1

Customers Worldwide

1

exporting country

Autefa imported lines with dual-cylinder eight-zone carding

4,000,000 ㎡

Annual Filter Media Production

Automatic Production Lines
Oil & Water Repellency Treatment
Heating Setting
Singeing
Calendering
Lamination

3,000,000 pcs

Annual Filter Bag Production

Automatic Multi-Task Production Lines
Precision Sewing
Heat Sealing
Pinhole Sealing
Seam Lamination

2,000,000 m

Annual Cage Production

Filter Cages of All Shapes & Sizes
Cage Treatments
Silicone Coating
Galvanizing
Passivation (stainless steel)

Quality Control

Raw material quality control

The raw materials of Aokai have undergone tests for 13 indicators in the laboratory, including fiber composition, air permeability, breaking strength and elongation at break, thermal shrinkage, moisture regain, oil content, and fiber melting point, with all test standards surpassing the relevant criteria.

Production process quality control

The factory has obtained ISO9001 and ISO14001 certifications. It operates in accordance with the 7S management standards, strictly controls product quality in line with international high-end product testing standards, retains inspection records for more than 3 years and electronic records permanently, ensuring the traceability of each batch of products.

Raw Material Inspection

Laboratory data analysis

Preliminary testing of filter cloth

Semi-finished product inspection

Finished product inspection

R&D Capability Advanced Laboratory

We use the state-of-the-art testing equipment and devices for raw material inspection, media selection, full-process production inspection, and new product development.