Introduction to the filtration principle of high efficiency filters

I. Diffusion principle

The smaller the particles in the air, the more intense the irregular movement, the more chances of hitting the obstacle, and thus the better the filtration effect.

II. Fibre filter material

Such materials can effectively intercept the dust particles in the air and also do not form too much resistance to airflow, while the numerous barriers formed by the fibers to the particles can prevent pollution and are allowed to pass through the airflow.

III. Hitting - sticking

The dust particles in the polluted air with the airflow to do inertial motion or irregular movement, this movement will be subject to some kind of field force and constantly moving, when the particles in motion hit the barrier, the gravitational force on their surface will make it stick to the barrier.

IV. Principle of inertia

The larger particles in the air generally do inertial motion, if encountered obstacles will go around, in which the larger the particles, the stronger the inertial force will be the greater the possibility of hitting the obstacle, and the better the natural filtering effect.

V. Running resistance

The role of the fibers will make the airflow around and thus produce a small resistance, and the sum of the resistance of countless fibers will form the resistance to the filtration equipment, the resistance will increase with the increase in airflow.
At this time we can effectively reduce the airspeed into the equipment by increasing the effective filtration area of the filter material so that the filtration resistance can be reduced.

VI. Changes in efficiency

Combined with what we have said before, generally, less than 0.1μm particles are doing diffusion movement, the smaller the particles, the higher the filtration efficiency; and more than 0.5μm particles are doing inertia movement, the larger the particles, the higher the filtration efficiency.