A filter cartridge is a replaceable filtration element used in industrial dust collectors to separate airborne particulate from the airstream. Different filter media and cartridge constructions are selected according to dust characteristics, filtration grade, operating temperature and process conditions.

Filter cartridges and filter bags each have suitable applications. Pleated filter cartridges can provide a larger filtration area within a compact volume, while filter bags may be more suitable for other temperatures, dust characteristics or operating conditions. Selection should be based on the actual application.

Industrial dust collector filter cartridges are commonly cleaned by pulse-jet compressed air. Compressed air pressure is typically above 4 bar. A short pulse creates reverse airflow through the cartridge, causing the pleated filter media to flex and helping accumulated dust detach from the surface.

Common sizes include Ø350 × 660 mm, Ø324 × 660 mm and Ø324 × 1000 mm. Other diameters, lengths and configurations can be customized according to equipment and application requirements. Filter media widths up to approximately 3000 mm can also be used for selected long-cartridge designs.

Filter cartridges are available in cylindrical, conical, fine-filter and other pleated configurations. Custom filter cartridges can also be manufactured according to supplied dimensions, drawings or samples.

Installation configurations include horizontal mounting, inclined mounting, chuck or pressure-rod mounting, threaded mounting, top loading, bottom loading, side loading and other customized structures according to the dust collector design.

Common filter cartridge media include cellulose-based filter paper, polyester (PET), glass-fiber-based media, PPS, P84, NOMEX, PI and other specialty filter materials. The appropriate material is selected according to operating temperature, dust characteristics, chemical conditions, moisture and filtration requirements.

Cellulose-based filter paper is commonly used for suitable low-concentration dry-dust applications. Pleated cellulose media can provide a relatively large filtration area within a compact cartridge. For example, a Ø350 × 660 mm cellulose filter cartridge typically has a filtration area of approximately 20-23.4 m², depending on pleat design.

Standard cellulose-based filter media are commonly available in filtration grades around F5-F7. With nano coating or other composite surface treatment, higher filtration grades such as F9-H10 can be supplied according to the selected media specification.

Additional options can include flame-retardant treatment, antistatic treatment and other functional surface treatments according to application requirements.

Polyester (PET) pleated nonwoven media are widely used for industrial dust collection and are suitable for relatively high dust concentrations. A Ø350 × 660 mm PET filter cartridge typically has a filtration area of approximately 9-10 m², depending on pleat geometry.

PET filter media are available in different filtration grades. Depending on the media construction and surface treatment, grades can range from approximately F5-F9 to higher-efficiency options such as H10, H11 and H12.

Functional options can include PTFE or ePTFE membrane lamination, flame-retardant treatment, antistatic treatment and other configurations according to application requirements.

High-temperature filter cartridge media can include PPS, P84, NOMEX, PI and other specialty filter materials. These materials have different temperature resistance, chemical resistance and moisture-resistance characteristics and should be selected according to the actual process conditions.

High-temperature nonwoven filter media commonly use heavier media weights than standard cellulose or PET media. Typical values vary by material and product specification.

The filtration grade depends on the base filter media, fiber structure, media weight, surface treatment, membrane technology and overall filter construction. Filter cartridges with the same external dimensions and even the same base material can therefore have different filtration performance.

For example, cellulose media may be supplied in grades such as F5-F7, while nano-coated or composite cellulose media can reach F9-H10. PET media can be supplied in grades ranging from approximately F5-F9, with higher-efficiency configurations including H10, H11 and H12 depending on the selected media and treatment.

The final filtration grade should be confirmed according to the actual filter media specification selected for the cartridge.

Nano coating is commonly used with cellulose-based filter media to improve fine-particle filtration performance. Impregnation treatments can be applied to selected media to improve stiffness, forming performance or other physical properties.

PTFE and ePTFE membrane lamination are commonly used with suitable filter media to provide a fine surface filtration layer. Different treatments result in different filtration grades, pressure drops and dust-release characteristics.

No. Filtration area and filtration efficiency are different parameters. A larger filtration area can reduce filtration velocity, but filtration efficiency is mainly determined by the filter media and filtration grade.

Excessively tight pleat spacing can also make dust release more difficult during pulse cleaning. Filtration area, pleat spacing, filtration grade and cleaning performance therefore need to be considered together.

Filtration velocity depends on the filter media, filtration grade, dust concentration, particle characteristics and cleaning conditions. For suitable applications, cellulose filter cartridges are commonly designed at approximately 0.5-0.7 m/min, while polyester (PET) filter cartridges are commonly designed at filtration velocities up to approximately 1.2 m/min.

The final filtration velocity should be selected according to the actual dust and operating conditions rather than cartridge dimensions alone.