Mask is a hygienic epidemic prevention. It refers to the functions of being worn on the nose and nose to filter the air to enter the nose and nose to achieve the role of blocking harmful gases, odors, droplets, viruses and other substances.During the popularity of respiratory infectious diseases, wearing a mask has a very good effect when operating in polluting environment such as dust.So how to choose a mask?How to wear it?
How to choose a mask
Dust resistance
The high and low dust resistance of the mask is based on its fine dust, especially the resistance efficiency of respiratory dust below 2.5 microns.Because the dust of this particle size can directly enter the alveoli, it has the greatest impact on human health.The principle of gauze mask is mechanical filtering, that is, when the dust collides with the gauze, the layers of block are separated to block some large particles of dust in the sand cloth.For some fine dust, especially the dust less than 2.5 microns, it will pass through the gauzes eyes and enter the respiratory system.The dust -proof mask, its filtering activated carbon fiber felt or non -woven fabric, and those breathing dust less than 2.5 microns are blocked during the process of passing this filter, which plays a role in filtering the air.
Dense degree
The mask anti -leakage design is to prevent air from using the gap between the mask and the human face without filtering the technical requirements of being inhaled.The air is like water flowing. If the resistance is small, it will flow towards it first.When the shape of the mask is not close to the human face, the dangerous matter in the air will leak from the dense place and enter the human respiratory tract.Well, even if you choose a mask with a good filter material.It is impossible to protect your health.Many foreign regulations and standards stipulate that workers should regularly test masks.The purpose is to ensure that the workers choose the appropriate size and take the mask in the correct steps.
Comfortable
In this way, workers will be willing to adhere to wearing and improving their work efficiency in the workplace.There are currently foreign maintenance masks, without cleaning or replacing parts. When the dust is saturated or the mask is damaged, it will be discarded.And many masks are arched shape, which can ensure that the tightness with the face shape is good, but also can retain a certain space at the nose and nose, which is comfortable to wear.
Model wearing method
Standard
If there is a gap between the mask and the face, when the person breathe, the airflow will flow to the gap, and the dust, droplets, and gas solution of the virus can be accompanied by the air flow through the gap to enter the body, causing infection.Therefore, officers and soldiers must standardize wearing masks.When wearing a mask, first reserve the reserved layer of the mask, fix the mask on the face through the ears, completely include the mouth, nose, and jaw, and then tighten the metal strip above the bridge of the nose to make it close to the bridge of the nose. Finally,Adjust the gas tightness of the chin area.If necessary, the lane rope can be knotted from behind to enhance the tightness.The entire wearing process should avoid contacting the outside of the mask by hand.
Distinguish
The one -time use of medical masks we wear is divided into three layers. The outermost layer is the water blocking layer, the middle is a filter layer, and the inner layer is a hygroscopic layer.The moisture -absorbing layer can absorb the humid gases exhaled from the mouth and nose, and keep the mask dry.If the mask is reversed, the gas exhaled from the nose and nose cannot be effectively absorbed, and the mask is easy to wet, and it loses the protective effect.Before wearing a mask, the mask nose should be facing up, and the dark surface is facing out.If the mask is not good, you can judge according to the folds of the mask, and the folds are downward.
Replace
Under normal circumstances, the use of medical masks and medical surgical masks at one time are limited to secondary use, and the cumulative use does not exceed 8 hours; professional exposure personnel use masks for no more than 4 hours.After the mask uses the upper limit, it cannot be used.The following situation should be replaced in time: the mask is damaged or damaged; the mask is contaminated (such as a foreign body such as blood stains or droplets); once used in the isolation ward or contact with the patient;Obviously increased; masks cannot be close to the face.

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