1. Protective medical masks are generally made into a folding cone shape, which is our common N95 mask, which needs to meet the national standard requirements of GB19083. There are two core technical indicators: 0.3 micron diameter non-oily fine particles filtering effect reaches 95 More than 2%, the larger diameter 2 micron bacterial barrier must reach 100%, of course, there are also high requirements for blood penetration resistance, and its own breathability is also required, this is usually used in severely infectious resources On occasion, the qualified N95 mask is usually composed of the following structure:
1-25-35 grams of water-repellent polypropylene spunbond nonwoven fabric, this layer of material is mainly used to block the spray;
2-30-40 grams of water-repellent hot air non-woven fabric, this layer mainly provides support, so that the cone-shaped mask and the face will not collapse when tightened;
3-50-60 grams of electret meltblown cloth with electret masterbatch and electret high voltage electrical treatment, this layer is the most core part, only after the electret treatment is there a lot of charge on the meltblown cloth The charged 0.3-micron non-oily small particles have a high efficiency of adsorption, and usually require more than 95%. This is actually only tested by professional instruments. Some manufacturers also use two layers of 25-28 grams of electret processed melt Spray cloth to achieve the effect of 50-60 grams of electret melt spray cloth!
4- Hydrophilic spunbond non-woven fabric near the face, this layer mainly has a certain moisture absorption effect to avoid too much mist!
2. Medical surgical masks
The difference between medical surgical masks and protective masks is that the protection level of medical surgical masks is one grade lower, which is mainly reflected in the technical indicators. The blocking effect of 0.3 micron non-oily small particles required by medical surgical masks reaches more than 30%. N95 and other medical masks The protective mask is 95%, and the bacteria barrier of 2 microns in diameter needs to be greater than 95%, which is the BFE95 standard, so this is generally used in surgical medicine not in the epidemic period. This can also be made into a cone shape similar to N95. But it is usually in the shape of a flat mask! If it is made into a plane mask, it usually consists of the following layers:
About 1-25 grams of blue or green water-repellent polypropylene spunbond cloth, to get the effect of blocking the droplets!
2-25 grams can reach BFE99 or BFE95 or more (BFE99 refers to 99% bacterial barrier) electret-treated melt-blown cloth, this layer is mainly able to block more than 95% bacteria and more than 30% 0.3 micron fine particles !
3-25 grams of hydrophilic polypropylene spunbond non-woven fabric, the main function is to absorb moisture.
3. Disposable medical surgical masks
These masks are all flat and need to meet the YY/T0969 standard. This is a mask that is one level lower than that of medical surgical masks. It is generally used by second- and third-line personnel in hospitals or in medical occasions with the lowest protection level during the non-epidemic period. Since 2016, the country will no longer issue the medical equipment certificate that implements the standard, that is, the new mask manufacturers will not allow the production of such masks. This is just the cause of this epidemic. The temporary medical device certificate has been redeveloped and some mask manufacturers Production of such masks.
The structure of disposable medical masks is basically the same as that of flat surgical masks. The difference is that the middle meltblown cloth is lower in grade. It only needs 95% of the bacteria barrier to 2 microns and non-oily to 0.3 microns. Fine particles are not required. This type usually requires electret treatment on the equipment. It is best to add electret masterbatch. During a special epidemic situation, it is recommended that the mask factory try to choose materials that can reach BFE95 and above, and To deal with it, if there is a shortage of imported electret masterbatches, you can consider domestically produced electret masterbatches!
Fourth, civilian-grade masks
The civilian masks are all flat. This is a mask that is one level lower than the protection of disposable medical masks. The structure is the same as that of disposable medical masks, except that the meltblown cloth used in the middle is an ordinary meltblown cloth that has not undergone electret treatment. This kind of barrier effect with only droplets, if the fiber is made thinner, it also has a short-term barrier effect on bacteria, but there is no adsorption force between charges. When inhaling, bacteria will enter the body with the pressure difference. The protective effect is average!https://www.ck-stone.com/