Polyester-Coated Bags

Specifications and dimensions can be customized according to customer requirements.

Grammage（g/ m²）

500-600

Gauge（mm）

1.8-2.1

Air permeability （ m3/m²/min@200Pa）

8.0-15

Continuous Operating Temperature（℃）

≤130

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Polyester-Coated Bags Introduciton

Polyester-coated filter bags use high-strength polyester needle-punched felt as the base material. Through a hot-melt coating process, a layer of microporous polytetrafluoroethylene (PTFE) film is bonded to the surface, thereby achieving highly efficient surface filtration. The core advantage of this product lies in its smooth PTFE membrane, which effectively traps fine dust particles, achieving a filtration efficiency of over 99.99%. At the same time, dust is easily dislodged, ensuring excellent cleaning performance, which significantly reduces operating resistance and extends the service life of the filter bags. In terms of applicable operating conditions, its continuous operating temperature typically does not exceed 120–130°C, with a short-term temperature resistance of up to 150°C, making it suitable for ambient-temperature flue gas treatment and dust recovery in industries such as steel, cement, chemicals, and foundries.

What is polyester needle-punched felt filter fabric?

Polyester needle-punched felt is the most widely used filter fabric in ambient-temperature dust collection applications, thanks to its versatility and high cost-effectiveness. Huading’s polyester needle-punched felt filter fabric is made from a long-fiber mesh and features fine fiber perforations on the surface; its optimal density and thickness ensure the best filtration efficiency and tensile strength.

A variety of post-treatment processes—including water and oil repellency, antistatic treatment, and PTFE membrane coating—are available to meet your specific operating conditions.

Advantages of Polyester Needle-Punched Felt Filter Fabric

Excellent tensile strength
Good acid resistance
Good solvent resistance
Cost-effectiveness
Continuous operating temperature below 135°C, with a peak temperature of up to 150°C

Disadvantages of Polyester Needle-Punched Felt Filter Fabric

Polyester material is prone to hydrolysis under high-temperature and high-humidity operating conditions. Its polymer chains contain ester groups, and this structure is highly susceptible to breakage in harsh high-temperature and high-humidity environments, leading to a decline in the filter material’s performance and a shortened service life.

Applications of Polyester Needle-Punched Felt Filter Cloth:

Mining
Cement Industry
Metal Industry
Aluminum and Non-Ferrous Metals Industry
Ceramics Industry
Quarries
Plastics Industry
Milk Powder
Flour Mills (used under dry conditions, with maximum temperatures up to 150°C)

Technical Specifications

Needle Felt Composition	Grammage （g/ m2）	Gauge （ mm）	Air permeability （ m3/m²/min@200Pa）	Continuous Operating Temperature（℃）	Short-Term Operating Temperature（℃）	Acid Resistance	Alkali Resistance	Abrasion Resistance
100% Polyester filament woven scrim + 100% Polyester staple fiber needle‑punched felt + PTFE Membrane	500-600	1.8-2.1	8.0-15	≤130	150	Good	Fair	Good

Key Performance Advantages

STEP 1

High filtration efficiency with stable, ultra-low emissions

The PTFE membrane features a pore size of approximately 0.2–0.3 μm, enabling highly efficient capture of sub-micron dust (including PM2.5). Filtration efficiency is ≥99.99%, and emission concentrations remain stably ≤10 mg/m³ (dropping below 5 mg/m³ in certain operating conditions).

STEP 2

Low operating resistance and energy savings

Dust does not penetrate the filter media; dynamic filtration resistance is ≤150 Pa (standard value). Initial resistance is low and stable, cleaning intervals are extended, and fan energy consumption is significantly reduced.

STEP 3

Thorough cleaning and high dust release rates

The smooth, non-stick membrane surface ensures weak dust adhesion; dust is easily dislodged via pulse-jet cleaning. Resistance recovers quickly, preventing the vicious cycle of "incomplete cleaning leading to escalating resistance."

STEP 4

Long filter bag service life

The base material resists pore clogging and hardening (caking), extending service life by over 30% compared to standard fabric bags (manufacturer data).

STEP 5

Optional functional treatments

Available with water- and oil-repellent or anti-static treatments to suit operating conditions involving moisture, oil, or static-prone dust.

STEP 6

High cost-performance ratio

Polyester base material offers affordability, high strength, and wear resistance. Balancing "ultra-low emissions" with "low cost," it is a highly cost-effective choice for ambient-temperature operating conditions.

Industry Applications

STEP 1

Mining

Primarily used for dust and particle removal during ore crushing, screening, and mineral powder conveyance. Polyester needle-punched felt offers high abrasion resistance and toughness, effectively withstanding the high-impact forces and high-concentration dust environments typical of mining operations.

STEP 2

Cement Industry

Used in dust collection systems at the tail end of cement kilns, in vertical mills, and during the packaging process. Leveraging its high porosity and excellent capture efficiency, it effectively intercepts fine cement particles at ambient and moderate temperatures, thereby improving dust collection efficiency.

STEP 3

Metal Industry

Used for dust control in processes such as raw material handling at steel mills, blast furnace tapping areas, and steelmaking batching. With its high surface smoothness and effective dust-shaking performance, it significantly reduces particulate emissions in flue gas.

STEP 4

Aluminum and Non-Ferrous Metals Industry

Used for gas-solid separation and flue gas purification in electrolytic aluminum production and copper, lead, and zinc smelting processes. Polyester needle-punched felt offers outstanding tensile strength and tear resistance, ensuring long-term, stable operation of dust collection systems.

STEP 5

Ceramics Industry

Used for dust collection in processes such as raw material grinding, spray drying towers, and green body processing. It efficiently captures extremely fine particles of slurry and glaze dust, preventing material waste and improving the workshop environment.

STEP 6

Quarries

Primarily addresses the large volumes of highly abrasive stone dust generated during stone crushing, screening, and at conveyor belt discharge points. Leveraging its superior wear resistance and puncture resistance, it significantly extends the service life of filter bags under harsh operating conditions.

STEP 7

Plastics Industry

Used for dust collection in plastic pellet conveying, pneumatic pelletizing, and batching systems. The smooth surface of the filter media facilitates dust removal, prevents clumping and blockages caused by fine plastic powder, and ensures continuous production.

STEP 8

Milk Powder Industry

Used for dust collection and material recovery in spray drying towers and milk powder packaging processes. Food-grade polyester needle-punched felt is selected to efficiently capture fine milk powder particles, reduce material loss, and ensure contamination-free and hygienic conditions.

STEP 9

Flour Mills

Specifically designed for dust collection in flour milling, flour cleaning, and pneumatic conveying systems (suitable for dry environments up to 150°C). Excellent air permeability and high-efficiency filtration prevent fine flour from clumping, while anti-static treatment effectively reduces the risk of dust explosions.

Storage & Handling Guidelines

Store unused bags in a clean, dry warehouse environment away from direct heat sources and chemical fumes. When stacking filled bags, ensure pallet bases are free of sharp protrusions, and follow recommended safe working load (SWL) stacking limits to prevent base compression.

Quality Assurance & Compliance

Our polyester-coated bags are manufactured under strict ISO quality management protocols. Every production run undergoes rigorous batch testing for seam strength, dart drop impact, burst strength, and coating adhesion to ensure zero leakage or field failures. Food-grade packaging configurations fully conform to FDA and EU raw material contact standards.