Part of filter gas mask

Gas masks are mainly composed of filter elements, housings, eye windows, exhalation speech devices and headbands. They all have their own responsibilities, but they can also cooperate with each other.

Filter element
The filter element is a loyal guardian on the gas mask. It only allows the clean air necessary for the human body to pass through. The masks of various countries in the world are varied, and the filter elements on the masks are also of different shapes, but the design ideas of their internal structures are much the same. The interior is equipped with a filter layer for aerosol (fine particles suspended in air), also called a filter layer, which is actually a layer of special filter paper. It not only has to filter out harmful aerosol particles efficiently, but also does not produce significant resistance to the human body's breathing.
The filter element is also equipped with anti-toxic charcoal specially designed to deal with toxic gas vapors. It is different from common civil activated carbon, and the anti-toxic carbon not only needs to have a well-developed microporous structure, so that it has a large "belly" and can "eat" poisons as much as possible, but also has well-developed mesopores and macropores. Make the road with adsorption smooth, meet the adsorption rate requirements. In addition to requiring a reasonable pore structure, anti-toxic carbon must be treated with special chemical agents, because it is not enough to deal with all kinds of poisonous magic by physical adsorption alone. It is necessary to resort to catalysts to carry out physical reactions to make it a lot of “drugs”. , Become an extraordinary "addict".
The new anti-toxic carbon has a strong ability to deal with poisons. However, with the passage of time, anti-toxic carbon will produce an inert, which is the natural aging. In order to prevent this kind of inertia from appearing prematurely, mask designers must prevent anti-toxic carbon from aging. Catalysis and aging are two deeply rooted disciplines. The key technologies are secretive in all countries. Some of the filter elements are placed on the left side of the mask; others are placed in the lower jaw; some also have airways, no matter how cleverly placed, it is like a stolen object. It is said that an enzyme that can “eat” the poison is now found. If this enzyme is used on the filter element, the mask design will undergo a qualitative leap.

Mask cover
The mask body is the main component that forms the whole part of the gas mask. At first glance, it is nothing more than an eraser, and there is not much knowledge. However, it is suitable for a variety of head-type people to wear, it is necessary to close, do not allow toxic substances into the gap, and does not cause facial pain, it is indeed not an easy task. Mask designers have racked their brains just for the part that fits their face, the experts say.

Initially, the box was made of a piece of rubber and called a single piece of box. It can be anastomosed to the face, and its structure and manufacturing process are very simple. However, after wearing, it often makes the facial part of the person feel unbearable tenderness, and the dynamic airtightness is also poor.
Later, the SLR Folding Box Structure appeared. It is based on the plane seal box plus a circle of anti-folding, relying on the elastic force of rubber to form a close force on the human face. The pressure in the mask during exhalation is greater than the outside pressure, and it is a close-fitting frame structure with positive pressure and air tightness. There is no doubt that the SLR Flap Fitting Box has taken a big step forward in comparison with the single-sheet sealing frame. However, there is still a big gap in satisfying the requirements for tactical use. At present, more advanced sealing frames are air-cushioned, double-flanged, and corrugated.

China Labor Insurance Network