How to distinguish the advantages and disadvantages of disposable masks?

First of all, we classify the commonly used masks. There are three kinds of non-woven mask (what is non-woven mask please Baidu), and each style is used in different places.

The first is a double-layer mask. Generally, two-layer masks are mainly used in food processing plants. There is no filter meltblown cloth in the middle, but two layers of non-woven fabrics are sewn together. Its main function is to prevent substances in the mouth from entering food, such as saliva, runny nose and colds. Its gram weight is generally around 45G.

The second is a three-layer mask, the interlayer of which is filter meltblown cloth, which is suitable for medical structures, outdoor, dust factories and other places. Its composition is double-layer non-woven fabric+middle layer filter meltblown fabric, which should be mentioned here.

The third is a disposable four-layer activated carbon mask, which adds another layer of activated carbon paper on the premise of the original three-layer non-woven filter paper, which better improves the ability of filtering dust bacteria. That is, the gray-black mask you see. However, it is usually enough to wear a three-layer mask outdoors, and of course it is ok to bring four layers.

There are many kinds of masks, so I won't say much here. Other kinds of masks are mainly used in industry and chemical industry, and have nothing to do with us ordinary people.

Let's talk about how to tell whether the mask in your hand is defective or genuine. Generally, after we hold the mask in our hands, we will stick it on our face to find a sunny place. The angle is 180. Look at the non-woven fabric pasted on your face in the sun to see if there are many little Mao Mao. If Mao Mao is found to be rich and boring, this kind of mask is made of garbage and unsanitary non-woven fabrics. After wearing this mask, I obviously feel itchy on my nose and face. Don't wear this mask,

In one case, it smells bad, or it will hurt your ears after wearing it.