As long as the disposable mask is three-layer, is it really a non-medical three-layer disposable mask useful? It has a certain effect, but it is not as effective as medical masks. The non-medical three-layer masks currently on the market have an outer layer of non-woven fabric that can block droplets and dust, the middle layer is a meltblown cloth that can filter fine particles, and the inner layer is a non-woven fabric. , It can absorb the exhaled heat, and is friendly and comfortable to the skin. Wearing has a certain effect of preventing droplets and preventing inhalable particles, but it has no protective effect on smaller viruses. If it is used in a medical environment or to prevent virus infection, it is recommended to wear ordinary medical masks, medical surgical masks, medical protective masks, etc. These types of masks have an obvious preventive effect on virus infection. Try to reduce the use of three-layer non-medical disposable masks. Are disposable masks real as long as they have three layers? Do not. In order to identify disposable medical masks, as long as they are made of three layers, their authenticity can be judged. The materials used in the third layer have very strict regulations, and their authenticity can be judged according to the following methods. : [H] Method 1: Waterproof test Use both hands to push the tested copper copper mask
from the outside (the side in contact with the air) to the inside (the side in contact with the face) into the pocket, and then pour an appropriate amount Water, about 1-2 minutes. If there is no water leakage and there is no water seepage in the inner layer, it means that the tested mask is very waterproof. The mask has a very good protective effect on liquid droplets and body fluid splashes. Meltblown non-woven fabrics are very dense due to its manufacturing process, and the fiber gap is extremely small, which can achieve this effect, but other fiber non-woven fabrics cannot achieve this effect. Method 2: Check the fibers to disassemble the tested copper mask, take out the middle layer, and observe through a magnifying glass. If you can see the fibers one by one, the layer will never melt. When spraying non-woven products, masks are definitely not disposable medical masks. Method 3: Check the wearing experience, wear a tested disposable mask, and cover the outer layer of the mask with your hands when exhaling. If you can feel the airflow is strong and breathing is very smooth, the filtering effect of the mask should be relatively poor, and the virus protection effect is naturally poor, so it is definitely not a disposable medical mask. Disposable masks with non-woven fabrics or melt blown cloth have better effects. Melt blown cloth masks have better effects. Medical masks usually adopt a multi-layer structure, called SMS structure: both sides are single-layer rotating adhesive layer (S), and the middle is a single-layer or multi-layer melt-blown layer (M). The best material for the meltblown layer is meltblown cloth, and meltblown cloth is the core material of the mask, which will bring virus filtering to the mask. The main material is the M-layer meltblown non-woven fabric in the middle. Meltblown non-woven fabrics are made of polypropylene material called high-melt fiber. It is a kind of ultra-fine electrostatic fiber cloth, which can effectively use static electricity to adsorb virus dust and droplets. Masks can be an important reason for filtering viruses. If you don't know whether your mask is anti-virus, it depends on whether there is a blow-dried cloth in the mask) However, please note that the blown cloth is fragile and cannot be washed with water. You cannot use alcohol spray. Even if it gets wet and then dries, it can damage the fiber and cause holes. The virus will pass through the loophole, and the mask will lose its protective ability. How long can a disposable mask be worn? It is best not to exceed 4 hours. How long a disposable mask can be worn mainly depends on the number of users and the actual situation. For medical staff who need to be exposed to pathogens and have a higher risk of infection, coupled with the characteristics of surgical masks, it is best to wear only one mask for 4 hours. If you want to prevent the popular epidemic, you can appropriately extend the wearing time of the mask, but the mask can only be used 5 times at most. In addition, it is difficult for ordinary people to wear a mask continuously for 4 hours, which will cause difficulty in breathing. Therefore, the wearing time can be replaced according to the damage, deformation or moisture of the mask.
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