Polyester Filter Bag

Industrial dust can pose serious risks, including explosions and fires, when its concentration reaches a certain level and is exposed to static electricity or external ignition sources. Dusts such as flour, chemicals, and coal can ignite under these conditions. Therefore, it is crucial for filter materials used in dust collection bags to possess antistatic properties.

Antistatic polyester needle felt is engineered to achieve excellent antistatic performance by incorporating conductive fibers or stainless steel materials during production. This design effectively dissipates static electricity, preventing its accumulation and minimizing the risk of explosions and fires, especially in environments where flammable dusts are present.

Working Principle

The polyester filter bag employs “depth filtration” technology. Initially, a “primary dust layer” forms on the surface as the filter material captures dust particles. During initial use, larger gaps in the filter may allow some dust to escape. Actual filtration begins once the powder cake forms. Over time, dust accumulates on the bag’s surface and penetrates deeper, gradually blocking the pores and increasing equipment resistance until the filter must be replaced.

Characteristics of Polyester Filter Bags

High Filtration Efficiency: Polyester filter bags capture fine dust and particles effectively due to their dense fiber structure.

Durability and Strength: Polyester fibers resist tearing and abrasion, extending the lifespan of the filter bags.

Chemical Resistance: These fibers provide good resistance to many acids and alkalis, making them suitable for harsh chemical environments.

Solvent Resistance: Polyester fibers withstand a wide range of solvents, enhancing their applicability in various industrial processes.

Thermal Stability: Polyester operates effectively at temperatures up to approximately 130°C (266°F).

Moisture Resistance: The inherent water-repellent properties of polyester make these filter bags effective in moist applications.

Cleanability: Polyester filter bags can be cleaned and reused multiple times, reducing operational costs.

Post-Treatment Options

We offer various post-processing treatments for polyester filter bags based on specific working conditions, including:

1. Anti-Static: Available in line type, cross line type, or blend type.
2. Anti-Spark: Enhances safety in flammable environments.
3. Water & Oil Repellent: Improves performance in damp conditions.
4. Anti-Abrasion: Features an acrylic coating for added durability.
5. PTFE Membrane: Provides additional filtration efficiency.
6. PTFE Impregnation: Enhances chemical and thermal resistance.

Specifications of Polyester Filter Bags

Material		polyester fabrics /Antistatic base cloth	polyester fabrics /conductive fiber /Filament base cloth	polyester fabrics /stainless fiber /Filament base cloth
Gram weight(g/m²)		500
Thickness(mm)		1.6	1.8	1.8
Air permeability (m3/m2.min)		12
Breaking strength (N/5×20cm)	warp	>800	>1000	>1000
	weft	>1300
Breaking elongation (%)	warp	<25	<35	<35
	weft	<55
Temperature (℃)	continue	≤130
	instant	150
Surface resistance（Ω）		4.8×10⁹	3.2×10⁸	8.3×10⁶
Volume resistance（Ω）		8.7×10⁹	<10⁶	<10⁵
Chemical properties	Acid Resistance	Good
	Alkali Resistance	Moderate
	Hydrolytic Resistance	Moderate
	Oxidation Resistance	Good
	Abrasion resistance	Good