Most surgical masks are self-priming filter masks, the working principle of which is that the air containing harmful objects is filtered through the filter material of the mask before being inhaled or exhaled by a person.
How surgical masks work
1. Diffusion deposition: The particles move to the filter fiber by Brownian motion and are absorbed by the attraction of molecules. It is the easiest to capture small-scale particles, fine fibers and particles moving at low speed.
2. Retaining sedimentation: The larger particles moving with the air flow are retained by the mechanical screening effect of the filter material. The ratio of particle diameter to membrane fiber diameter affects the interception efficiency.
3. Inertial deposition: When the particles pass through the curved mesh channel of the filter material, the particles are separated from the airflow and hit the filter fiber due to the inertial effect, and are trapped by the molecular attraction. The large particles, high density, and high speed have good interception effect.
4. Electrostatic attraction deposition: the deposition of particles generated by the electrostatic action of the filter fiber.