Non-woven fabric is the main raw material for the production of masks. Common masks include the following: common cotton masks, disposable masks (such as medical surgical masks, general medical masks), and medical protective masks (N95 / KN95 masks).

Among them, medical protective masks (N95 / KN95 masks) and medical surgical masks are nationally regulated medical products after SARS in 2003, and have the function of blocking the passage of liquid and droplet particles. If worn correctly, it can effectively prevent droplet-borne diseases and is our first choice for purchasing masks. They are usually made of multiple layers of non-woven fabrics.

The mask is a multi-layer composite structure. The N95 / KN95 mask consists of the innermost and outermost non-woven fabric layer, the middle electrostatic layer and the melt-blown nonwoven fabric layer, and the medical surgical masks are a non-woven fabric layer and a melt-blown nonwoven fabric Cloth layer. In addition to supporting the mask, the non-woven layer also plays a part of the sieve, and the particles with large particle size will be blocked by them. Meltblown non-woven fabric has ultra-fine fiber structure, has good filterability, and can intercept medium-sized particles. The electrostatic layer plays the role of electrostatic adsorption. Particularly small particles are very light and will be adsorbed.

How to choose a non-woven mask?

So what kind of non-woven mask is a good mask?

The larger the particle, the better the filtering effect, and the smaller the particle, the better the adsorption effect, and the medium-sized particles become the most likely to leak out. According to a large number of experiments, this particle size range is between 0.2 and 0.8 microns. Therefore, in GB2626-2006 "Respiratory Protective Products-Self-priming Filtering Anti-Particulate Matter Respirator", the detection of leakage requires the particle size to be between 0.02 microns and 2 microns, with a median of 0.3 and 0.6 microns.

It should be noted that although the medical protective mask with high protection level has better protection effect, because of the high filter material level, good adhesion and higher respiratory resistance, long-term wearing will increase the burden of breathing, causing difficulty in breathing and other discomforts.

If it is only for daily use and does not go to places where the risk of pathogen infection is high, you can choose a medical surgical mask.