The filter cartridge is the core component of the oil mist filter. Its filtration does not rely on a single mechanism, but works synergistically based on five major principles: physical interception, inertial impaction, Brownian motion, gravitational sedimentation and electrostatic adsorption. Filtration is carried out layer by layer following the principle of "coarse filtration first, fine filtration afterwards":
- Coarse Filter Layer
Made of metal woven mesh and thick fiber felt with large pores. It mainly traps large oil mist particles larger than 10μm through gravitational sedimentation and inertial impaction. It reduces the burden on subsequent fine filter layers and extends the overall service life of the filter cartridge.
- Fine Filter Layer
Constructed with glass fiber and ultra-fine synthetic fiber featuring tiny pores. It accurately captures medium particles of 1–10μm and micro-particles below 1μm via physical interception, Brownian motion and electrostatic adsorption. The oil mist concentration is reduced to the microgram level to meet environmental protection standards and production precision requirements.
- Adsorption Layer (Optional)
Usually made of activated carbon and molecular sieves. It removes residual trace oil vapor and peculiar odors. It is widely used in food, electronics, semiconductor and other industries with extremely strict air quality requirements to further improve air cleanliness.
