Medical Gu Affairs
02-06 - Director of the Chinese Medical Association Professor of Neurosurgery
As medical workers, medical masks are our essential two-way protection supplies. Medical masks must be worn before medical operations, and some even require medical masks to be worn during room checks. Medical mask protection effect is good or bad, and the choice of medical masks, whether the correct wear medical masks, masks and facial fit is directly related.
Medical masks belong to the second class of medical devices, most of the self-absorbing filter masks, the principle of its work is to make the air containing harmful substances through the medical masks filter media and then be inhaled or exhaled.
The working principle of medical mask filter media
1, diffusion deposition: the particle Brownian motion diffusion displacement to the filter fiber, by the molecular gravity and adsorption. It is easiest to capture small-scale particles, fine fibers and low-speed movement of particles.
2, retention of deposition: with the movement of the airflow of larger particles are filter material mechanical sieve filtering effect of retention. The ratio of particle diameter to the diameter of the membrane fiber affects the interception efficiency.
3, inertia deposition: particles through the filter material curved mesh channel, particles due to inertia from the airflow impact on the filter fiber, and by the molecular gravity is retained. Large particles, high density, fast speed when the retention effect is good.
4, electrostatic attraction deposition: particles are filtered by the electrostatic effect of fiber deposition.
The smaller the particles, 1, 4, the stronger the deposition effect, the larger the particles, 2, 3, the better the effect, so it is not the smaller the particles are more difficult to be filtered. The synergistic effect of the combined filtration mechanism, the ordinary mechanical filter material is most likely to penetrate the particle size of the range of 0.1m ~ 0.3m.
Product structure composition
Medical masks are generally made up of the following materials:
Body filtering materials: such as polypropylene meltblown cloth. Other materials: metal (for nose clips), coloring agents, elastic materials (for mask straps) and so on.
Medical masks generally have the following forms:
According to the shape of the mask can be divided into flat, duckbill, arched or folded. According to the way of wearing can be divided into ear-hanging type, strap type or headband type.
Mastering the correct wearing method of medical masks can avoid the gas from both sides of the bridge of the nose in and out, so as to play the filtration and gas exchange function of medical masks, pay attention to personal safety protection.
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