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Selection Guide

Home Resources Selection GuideSelection of Filter Material for Dust Collector Filter Cartridge

Selection of Filter Material Special for Dust Collector Filter Cartridge

The filter cartridge is the filter element of the cartridge dust collector and is one of the most important components. It consists of pleated filter material, a support frame, upper and lower end caps, adhesive, and a sealing ring, with the filter material being the core of the filter cartridge. The selection of filter material needs to follow several basic points.

High hardness, can withstand a certain negative pressure after pleating;
Not too brittle, and can withstand long-term pulse action;
Not too thick, as it is not conducive to increasing the filtration area;
Good stability, and can adapt to conditions such as humidity and temperature;
Environmental protection, the filter material must not release harmful substances.

Cross-sectional view of a cartridge dust collector

Filtration Mechanism

Thickening the dust layer
When a new filter cartridge is first installed in the dust collector, a large amount of dust quickly adheres to the surface of the filter material, and the dust layer continuously thickens. During pulse back-blowing, a large amount of rapid airflow enters the inner frame of the filter cartridge, generating an instantaneous impact force that causes the filter material to vibrate and bend, peeling off the outermost dust layer on the surface of the filter material and expelling it with the airflow, thereby achieving the effect of pulse cleaning.
Forming initial dust cake
After cleaning, we hope that a stable initial layer of dust remains on the surface of the filter material and is not removed. This layer of dust is called the initial dust cake. It is the key to ensuring filtration efficiency, and it can maximally prevent subsequent dust from entering the core of the filter material, effectively protecting the filter material from clogging. This is the mechanism of surface filtration.

Precautions

Therefore, during cleaning, it is essential to ensure that cleaning is not excessive; otherwise, it will shorten the lifespan of the filter cartridge and cause emissions to exceed standards. However, when the cleaning effect is poor, the dust layer will continuously increase, causing the filter material to become severely clogged. This is also not the effect we expect to achieve, so pulse cleaning should be appropriate, neither excessive nor insufficient.

Schematic diagram of the filtration mechanism of a filter cartridge dust collector

Common Filter Cartridge-Specific Filter Materials

Air Filter Paper.

The earliest filter material used for filter cartridges was air filter paper made from wood pulp fibers. Nowadays, better quality filter paper generally incorporates a certain proportion of synthetic fibers into the wood pulp fibers to improve the performance of the filter paper.

PET hot-rolled non-woven fabric in a factory

Polyester Spunbond (PET) Thermal Bonded Non-Woven Fabric

During the production process, the fibers are continuously sprayed, giving this filter material advantages such as high strength, long service life, good moisture resistance, and high operating temperature (< 135 °C), making it particularly suitable for use as filter material for filter cartridges.

Mechanical equipment is producing spunlace nonwoven fabric.

Other Forms of Non-Woven Fabric

To meet different working requirements, several fibers can be mixed and used simultaneously. For example, melt-blown, spunbonded three-layer composite non-woven fabric, and needle-punched non-woven fabric can all be applied to filter cartridge manufacturing after being reinforced.

Special Functions of Filter Materials for Filter Cartridges

The situations encountered in actual working conditions are ever-changing, and a few simple filter materials can hardly meet the actual working demands. For instance, when dealing with flammable and explosive dust, it is necessary to avoid static discharge. Since chemical fiber (high insulation) filter materials easily accumulate static electricity, to prevent static discharge, the filter material needs to undergo anti-static treatment.

The main special functions of the filter material specifically for filter cartridges currently include:

Flame retardant (treating combustible materials to resist burning, reducing the likelihood of fire).
Anti-static and explosion-proof.
Polytetrafluoroethylene (PTFE) membrane (improving cleaning performance and enhancing filtration precision).
Oil-resistant, waterproof, anti-fouling (reducing the surface tension of the filter material, making cleaning easier).