Cut the mask template and draw the template on the paper according to the size. Cut and sew the cloth surface, cut the cloth according to the size, and put the hanging rope in the middle of the cloth for sewing. Just put the wrinkles of the mask on the medium-sized part.

surgical mask

Mask is a sanitary product, which generally refers to a device worn on the nose and mouth to filter the air entering the nose and mouth to prevent harmful gases, smells and droplets from entering and leaving the wearer's nose and mouth. It is made of gauze or paper.

Masks have a certain filtering effect on the air entering the lungs. Wearing a mask has a very good effect when respiratory infectious diseases are prevalent and when working in polluted environments such as dust.

Masks can be divided into air filtration masks and air supply masks.

On 2002114, the State Council Press Office held a press conference to introduce 224.2 billion masks exported by China in 2020. In February165438+1October, the General Administration of Market Supervision and other four departments jointly deployed to strengthen the supervision of mask quality.

system of selection

Dust-blocking efficiency

The dust blocking efficiency of the mask is based on its blocking efficiency for fine dust, especially for inhalable dust below 2.5 microns. Because dust with this particle size can directly enter alveoli, it has the greatest impact on human health.

Gauze mask, its dustproof principle is mechanical filtration, that is, when dust collides with gauze, some large particles of dust are blocked in emery cloth through layers of barriers. For some fine dust, especially dust smaller than 2.5 microns, it will enter the respiratory system through the mesh of gauze.

Dust mask, its filter material is activated carbon fiber felt pad or non-woven fabric. Breathable dust smaller than 2.5 microns is blocked in the process of passing through this filter material, which plays a role in filtering air.

degree of tightness

The side leakage prevention design of mask is a technical requirement to prevent air from being inhaled through the gap between mask and human face without filtering. Air is like water flow, where there is little resistance, it flows first. When the shape of the mask is not close to a person's face, dangerous substances in the air will leak into a closed place and enter the human respiratory tract.

Well, even if you choose the mask with the best filter material. It can't guarantee your health. Many foreign laws and regulations require workers to regularly test the tightness of masks. The purpose is to ensure that workers choose suitable masks and wear them according to the correct steps.

Comfortable to wear

In this way, workers will be willing to wear them in the workplace and improve work efficiency. At present, foreign maintenance-free masks do not need to be cleaned or replaced, and they are discarded when the dust resistance is saturated or the mask is damaged, which not only ensures the hygiene of the mask, but also saves the time and energy for workers to maintain the mask.

Moreover, many masks are arched, which can not only ensure a good fit with the face, but also reserve a certain space at the nose and mouth, making them comfortable to wear.