Flat filter bags for dust collectors, as the core filtration elements of flat-bag dust collectors, are typically made of materials such as polyester needle-punched felt.These filter bags are widely used in dust control applications across industries such as cement, metallurgy, building materials, chemicals, machinery, foundries, and grain processing.
Flat filter bags for dust collectors, as the core filtration elements of flat-bag dust collectors, are typically made of materials such as polyester needle-punched felt. They feature a flat structure—such as rectangular, trapezoidal, or wedge-shaped—and offer the significant advantage of increasing the filtration area by approximately 32% compared to round filter bags of the same volume, resulting in a more compact equipment design. the filter media weight is approximately 500-600 g/m², with a thickness of 1.8-2.1 mm; the transverse tensile strength is >1,100 N/5×20 cm; the operating temperature generally does not exceed 130°C; the dust removal efficiency can reach over 99%; and they can effectively capture fine dust particles of 0.3 microns or larger. Due to their high space utilization and excellent dust removal efficiency, these filter bags are widely used in dust control applications across industries such as cement, metallurgy, building materials, chemicals, machinery, foundries, and grain processing.
| 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 |
