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How to understand masks

By admin on Mar 20, 2020

1、protective medical masks

Protective medical masks are generally made of folded cones, which is our common N95 mask. It needs to meet the national standard of GB19083. There are two core technical indicators: the filtering effect of non-oily fine particles with a diameter of 0.3 micron is above 95%. The bacterial barrier with a larger diameter of 2 microns must reach 100%. Of course, there is also a high requirement for blood penetration resistance, and its own air permeability is also required. This is usually used in places with severe infectious resources. Qualified N95 masks usually consist of the following structures:
1, 25-35 grams of water-repellent polypropylene spunbond non-woven fabric, this layer of material is mainly used to block droplets;
2, 30-40 grams of water-repellent hot-air non-woven fabric, this layer is mainly used for support, so that the cone-shaped mask does not collapse when tightened with the face;
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 the charge on the meltblown cloth after the electret treatment is the same. Charged 0.3-micron non-oily particles have a high-efficiency adsorption effect, which is usually required to be greater than 95%. This can only be tested by professional instruments. Some manufacturers also use two layers of 25-28 grams of electret after melting. Spray cloth to achieve the effect of 50-60 grams of electret melt spray cloth!
4. The hydrophilic spunbond non-woven fabric near the face. This layer mainly has a certain moisture absorption effect, avoiding too much fog!
(1) Due to the low production capacity of N95 mask equipment, there are generally only 40-50 pieces per minute. Meltblown cloths are also very scarce in recent times, especially the super-insulated electret masterbatch, which relies heavily on imports, so it is recommended to leave it to the front line For medical staff and staff!

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 reflected in the technical indicators. The 0.3 micron non-oily small particles required by medical surgical masks have a barrier effect of more than 30%. N95 and other medical The protective mask is 95%, and the barrier property of bacteria with a diameter of 2 microns needs to be greater than 95%, which is the BFE95 standard. Therefore, this type of mask is generally used in surgical medicine that is not in an epidemic period. This can also be made into a cone shape similar to N95. But it is usually made into the shape of a flat mask! If made into a flat mask, it usually consists of the following layers:
1, about 25 grams of blue or green water-repellent polypropylene spunbond fabric, take the role of blocking droplets!
2. About 25 grams can reach BFE99 or BFE95 or higher (BFE99 refers to the bacterial barrier of 99%) of the melt-blown cloth for electret treatment. This layer's main function is to block more than 95% of bacteria and 30% of 0.3 microns fine particles !!
3, 25 grams of hydrophilic polypropylene spunbond non-woven fabric, the main role is to absorb moisture.
Medical surgical masks meet the standard YY / T0469. This type is usually only available from manufacturers with a formal medical device certificate. It is also scarce during the epidemic period. It can be used by second- and third-line staff in the hospital and can also be used by ordinary people!
The above two types of medical masks require a formal medical device certificate to produce. If it is an original product from a regular manufacturer, it is not counterfeit, it has a medical device certificate, and the logos GB19083 and YY / T0469 are generally qualified medical devices. Masks!

3.Disposable medical surgical masks

These masks are flat and need to meet the YY / T0969 standard. This mask is one level lower than the medical surgical mask protection. It is generally used in the second or third line of hospitals or the lowest protection level in medical situations during non-epidemic periods. Beginning in 2016, the state will no longer issue the medical device certificate that implements this standard, that is, new mask manufacturers, which will not allow the production of such masks, but this time the epidemic situation has re-developed the temporary medical device certificate to allow some mask manufacturers Produce this mask.
The structure of disposable medical masks is basically the same as that of flat surgical masks, except that the melt-blown cloth in the middle is lower. It only needs to have 95% barrier to 2 micron bacteria and non-oily to 0.3 micron. Fine particles are not required. This type of equipment usually requires electret treatment on the equipment. It is best to add electret master batches. During special epidemic periods, it is recommended that mask factories choose materials that can reach BFE95 or higher. To deal with, if the imported electret masterbatch is short, you can consider domestic electret masterbatch!
Because the melt-blown cloth that has not undergone the electret treatment has no charge adsorption effect, germs and bacteria easily enter the body with inhalation, in fact, it does not block the effect of bacterial fungi and pathogens!

4.Civil level masks

The civilian masks are all flat. This mask is one level lower than the disposable medical mask protection. It has the same structure as the disposable medical mask, except that the melt-blown cloth used in the middle is a common melt-blown cloth that has not undergone electret treatment. This kind of barrier effect is only droplets. If the fiber is made thinner, it will also have 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!
During the special epidemic period, the capacity of the meltblown cloth itself was originally scarce, and the general SMS equipment can be changed to produce meltblown cloth for electret processing. With the increasing number of mask equipment, no gap mask equipment, lack of meltblown cloth Under the circumstances, it is recommended to make less common civilian masks made of ordinary meltblown cloth, which have no protective effect. This will not only waste the valuable production capacity of the meltblown cloth, but also not achieve the real protective effect. Electret equi


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