Can disposable masks prevent respiratory viruses?
Disposable masks are a type of medical mask. In disposable masks, work can usually be carried out in an environment containing steam and harmful gases. In addition, the use of a disposable mask can also prevent harmful objects from entering the respiratory tract, thereby protecting the human body. So can a disposable mask prevent respiratory viruses?
The disposable mask is made of 12 or 16 layers of gauze with a length of 18cm and a width of 14cm. The density of the gauze is 9 per cm. The filter has been tested with this disposable mask and found to be disposable. The following dust dust-removing efficiency is only about 10%. Therefore, the State General Administration of Labor issued two articles on May 21, 1981 and January 5, 1982, “It is strictly forbidden to issue and wear disposable masks” in dusty workplaces, and must be used in accordance with national standards (迢2626 “Self-absorption filter type Dust mask. How big is the virus? Generally, it should be magnified tens of thousands of times with an electron microscope to see that most viruses are below 150nm in diameter.
Therefore, we can know that in addition to the prevention of general bacilli, disposable masks are not filtered for most viruses and cocci. Then, if the structure of the disposable mask is not tight enough or the moisture permeability of the disposable mask is insufficient, it is difficult to prevent microorganisms.
1 Stretch the headband before wearing a breath-protected disposable mask on your face.
2 If the respiratory protection disposable mask is folded, open the fold layer first.
3 Hold the breath-protected disposable mask so that the metal nose clip is at the fingertips, allowing the headband to hang freely.
With the nose clip facing up, hold the respiratory protective disposable mask on the chin. If there are two headbands, put the top headband on top of the head and place the lower strap over the head behind the neck, below the ear. If there is only one headband, the headband should be placed at the top of the head. Confirm that the respiratory protection disposable mask covers the nose and mouth and covers the chin. Looking in the mirror helps to adjust the position of the respirator on the face.
Place the tip of the two fingers on top of the metal nose clip. If there is no metal nose clip, there is no way to adjust it. With both hands, press the nose on the bridge of the nose and shape the nose clip according to the shape of your nose. Pinch the nose clip with one hand will result in poor adhesion and reduce the protective effect. Must be operated with both hands.
Check the air tightness of the wear after wearing a respiratory protective disposable mask. The inspection is divided into two steps. First, completely cover the respiratory respirator with both hands, then quickly inhale to see if the perimeter of the respirator fits snugly against the face. Then, completely cover your breathing mask with your hands and exhale. Be careful not to change the position of the respiratory protection disposable mask. If air is found to leak from the vicinity of the bridge of the nose during these two procedures, re-adjust the nose clip as in step 5. If air is found to leak from the perimeter of the mask, adjust the headband to a more rearward position.