Compressed air passes through the filter element and collects particles and oil droplets through four mechanisms: gravity action, inertial impact, direct interception, and penetration.

Gravity Action

When the air flow velocity in the filter is low, most particle and oil droplets with a diameter of 20-50 um will be collected by gravity before reaching the filter layer. Additionally, air flow through the filter layer will slow down the oil droplets as they fall.  The higher the airflow speed, the less efficient the collection of oil droplets will be.

Inertial Impact

Suspended particles with a diameter greater than 1um are highly impulsive when colliding inertially. The flow path is not always consistent with the fiber layer, so it will hit the fiber layer inertia. The higher the airflow velocity, the higher the collision rate.

Direct Interception

Particles from 0.3-1 um will move with air flow. They will be intercepted and separated by the fiber layer at half of the filter element. The smaller the particle, the lower the intercept rate.

Permeation

The particles smaller than 0.3 um in diameter, which are too small to have the generality of liquids, move in an irregular Brownian motion that is inconsistent with the path of airflow and can be captured by a finer filter layer. The smaller the particle. Particles with a smaller diameter have a more violent Brownian motion, which increases the possibility of catching them.