From the perspective of human physiological structure, because the blood circulation of human nasal mucosa is very strong, the passage in the nasal cavity is very tortuous, and the nasal hair constitutes a "barrier" of filtration ". When air is drawn into the nostrils, the airflow forms a vortex in the tortuous passage, warming the airflow drawn into the nasal cavity. Some tests have shown that when cold air at minus 7°C is inhaled into the lungs through the nasal cavity, the airflow has been heated to 28.8°C, which is very close to the temperature of the human body.

2024

Replacement of masks

Dust filter cotton, in the mask and the user's face close to the case, when the user feels that the respiratory resistance is very large, indicating that the filter cotton has been covered with dust particles, should be replaced with a new mask.

2024

Method of wearing masks

If there is a gap between the mask and the face, when people breathe, the airflow will flow to the gap, and the dust, droplets, aerosols, etc. attached to the virus can be accompanied by the airflow through the gap into the body, causing infection. Therefore, officers and soldiers should regulate the wearing of masks. When wearing the mask, first unfold the radian reserved layer of the mask, fix the mask on the face through the ear band, completely wrap the mouth, nose and lower jaw, then firmly pinch the metal strip above the bridge of the nose to make it close to the bridge of the nose, and finally adjust the air tightness of the chin. If necessary, tie the lanyard from the back of the head to improve tightness. Avoid touching the outside of the mask with your hands throughout the wearing process.

2024

Mask air filter material

For a good protective mask filter material, should have the following three conditions, one is in the mask and the user's face close to the case of high filtration efficiency, two is the respiratory resistance is small, three is the user feel comfortable. Dust mask filter material has a variety of materials, including ordinary fabrics, animal hair, non-woven fabrics. In the national standard is very popular is a kind of activated carbon felt material.

2024

The degree of fit of the mask

The anti-side leakage design of the mask is to prevent air from passing through the gap between the mask and the human face without being inhaled through the filter. Air is like water flow, where the resistance is small to flow first. When the shape of the mask is not close to the human face, the dangerous substances in the air will leak into the human respiratory tract from the same place. So, even if you choose the best filter mask. Nor does it protect your health. Many foreign regulations and standards stipulate that workers should be regularly tested for mask fit. The purpose is to ensure that workers choose the right size of the mask and wear the mask according to the correct steps.

2024

Selection method of masks

Epidemic prevention standard To meet the requirements of epidemic prevention, only these five codes: Medical protective masks (GB19083-2010) Medical surgical masks (YY0469-2011) Disposable medical masks (YY/T 0969-2013) Daily protective masks (GB/T 32610-2016)

2024

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