How to distinguish the front and back of a mask
The method of distinguishing the front and back of the mask is through the metal strip. Usually the color of the medical mask is the same, which makes it difficult for people to distinguish. Generally, the metal strip is on the top and the side protruding to the outside is the outside, and the opposite side is On the inside, it can also be distinguished by creases. The side with the crease upward is the inner face, and vice versa. Masks are a kind of protective tool that plays a filtering role. The use of masks has a good protective effect on people. Generally, a multi-layer filter device is used in masks to filter out polluted gases and small particles in the air. , So as to better protect people's respiratory tract, make people's body safer and healthier, which also makes the use of masks more important.
Wash your hands, keep your hands clean and hygienic, pick up the mask, place the mask horizontally on your face, mouth and nose, and hang the ropes at both ends of the mask on your ears. The metal strip inside the mask should be on the upper nose bridge. Pull the folds of the mask up and down with both hands at the same time, and press the metal strips on both sides of the nose bridge above the mask with the middle fingers of both hands to ensure that the mask can completely cover the mouth, nose and chin.
Is the mask white inward or blue inward
The correct way to wear a mask is the blue one on the outside. Generally speaking, masks of different colors have the colored side on the outside, such as blue, pink, purple, etc., the side facing out, and the white side facing inward, close to our face. Not only that, but the mask is also divided into upper and lower parts. The side with a metal strip inside that is hard to touch is the upper end, which is close to the bridge of the nose when worn. Generally blue medical masks are composed of a mask face and a tension band. The face of the mask is divided into three layers: inner, middle and outer. The inner layer is made of skin-friendly material, the middle layer is the isolation filter layer, and the outer layer is a special material antibacterial layer. This kind of high-efficiency medical mask has strong hydrophobicity and air permeability, and has a significant filtering effect on small virus-carrying aerosols or harmful dust, but cannot effectively filter PM10 and PM2.5. The overall filtering effect is good, and the materials used are non-toxic, harmless and comfortable to wear.
Can the mask be worn for a long time
Masks should not be worn for a long time. Because the blood circulation in the nasal mucosa is very strong, the passage in the nasal cavity is very tortuous, and the nose hair forms a filtering "barrier". When air is sucked into the nostril, the airflow forms a vortex in the tortuous passage, which heats the airflow sucked into the nasal cavity. If you wear a mask for a long time, the nasal mucosa will become fragile and lose the original physiological function of the nasal cavity, so you cannot wear a mask for a long time. Masks can only be worn in special environments, such as places with many people and poor air circulation. Of course, walking in the wild, in order to resist wind, sand and cold, or activities in an environment with air pollution, you need to wear a mask, but the time should not be too long. In addition, during the flu season, you should wear a mask when you go to public places where there may be a large number of pathogens. Wearing a mask is just one of the ways to prevent respiratory infectious diseases, and the most important thing is to maintain good living habits.