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Air filter technology and principle

May 16, 2017

Air filter technology mainly uses filtering separation method: by setting the different performance of the filter to remove suspended particles and microorganisms in the air, namely through the filter dust particle trapping interception down, to ensure the cleanliness requirements into the air. The filter material used is a thinner diameter fiber that can flow smoothly through the air and also effectively collect dust particles.

Clean filter dust control technology is generally 0.1---10 m dust particles, smaller particle size, containing solid particles and liquid particles suspended in the atmosphere; particulate organic matter with microorganisms and plants, pollen and tidbits of villi, general microorganisms including viruses, bacteria, Rickettsia bacteria, fungi, protozoa and algae. Air purification is controlled mainly by bacteria and fungi, viruses. Because microorganisms are mainly attached to dust particles, effective control of dust particles in the air can also effectively control bacteria, fungi and viruses in the air. To do this, it must be filtered by barrier particles. Generally, the efficiency of the conventional HEPA filter to bacteria can reach 99.996%, which basically meets the requirements of filtration and purification of biological clean rooms..

There are mainly 5 kinds of filter trapping particles:

1. Intercept effect: when a particle of particle size moves near the fiber surface, the distance between the heart line and the fiber surface is smaller than the radius of the particle, and dust particles will be intercepted by the filter fiber.

2, inertial effect: when the particle mass is larger or faster, it is due to inertia and impact on the surface of the fiber deposition.

3, diffusion effect: small particle size Brown motion is strong and easy to hit the fiber surface.

4. Gravitational effect: particles are deposited on the fiber by gravitational settling when passing through the fiber layer.

5. Electrostatic effects: fibers or particles may carry charges that produce electrostatic effects that attract particles and attract particles onto the surface of the fibers.