1. Factors affecting the performance of dust masks
Dust mask, as the name suggests, is to prevent inhalation of dust. The key to its function lies in the performance of the filter material, mainly including:
1. Fiber fineness of the filter material
It is expressed as the diameter of the fiber in microns. Generally, the fiber diameter used for dust cover filter material is preferably less than 5 microns. The diameter of the commonly used polypropylene microfiber is 4.0 microns, and the fiber diameter of the chlorine superfine fiber filter material is less than 2 microns. The dosage of fiber is positively correlated with the dust-proof efficiency, that is, the finer the fiber, the higher the dust-proof efficiency.
2. The structure of the filter medium
The structure of the filter material is related to the production process of the filter material. At present, the forming processes of synthetic fiber non-woven filter materials mainly include acupuncture method, direct injection method, bonding method, hot-melt method and so on. Moreover, the method of hot-melt injection molding is adopted, and by this method, two or more different fiber materials can be used for composite molding, which improves the dust-proof efficiency, and is relatively soft and has good air permeability.
3. Filling of filter media
The size of the filter material is positively correlated with the component efficiency, that is, the larger the electrostatic charge, the higher the dust suppression efficiency.
2. Dust mask selection principle
There are many types of dust masks, and the selection needs to be tailored according to different operating needs and working conditions. First of all, it should be selected according to the concentration and toxicity of dust. For high temperature and high humidity environments, a mask with an exhalation valve will be better, and a mask that removes ozone welding can provide additional protection. However, if the ozone concentration is more than 10 times higher than the occupational health standard, the mask can be replaced, and the combined filter element can be mixed with dust and poison. In an environment with no particulate matter but only some peculiar smell, such as some laboratory environments, choosing an activated carbon layer dust mask is much lighter than wearing a gas mask. However, since the national standard does not regulate the technical performance of this mask, try it first to judge whether it can effectively filter odors.
Whether the dust mask really plays a protective role, in addition to the choice of protective function, another important selection factor is Suitable. There is no one design that fits all face shapes. At present, certification testing of dust masks does not guarantee that the masks are suitable for each specific user. If there is a leak, airborne contaminants can enter the breathing zone from the leak. The way to choose a suitable mask is to use the fitness test, that is, to use human taste to produce bitter or sweet particles with special tools. If you can still feel the smell after wearing the mask, it means that the mask is leaking.
The mask should have a high dust-proof efficiency. The dustproof efficiency of the mask is measured by its resistance to fine particles, especially respirable dust below 5 μm. Generally, the dustproof principle of gauze masks is mechanical filtration, that is, when dust hits the gauze, some large particles of dust will be blocked in the gauze through layers of barriers. However, fine dust, especially dust less than 5 μm, can pass through the mesh of the gauze and enter the respiratory system. There are some dust masks on the market. This kind of filter material is filled with electrostatic fiber components. Those respirable dust less than 5 μm will be attracted by static electricity and adsorbed on the filter material through the processing process of the filter material, which plays a role The role of dust removal.
The mask fits well with the shape of the face. When the mask is not close to the face, the dust in the air will enter the respiratory tract through the gaps around the mask. Therefore, people should choose a dust mask that suits their face shape and wear it correctly.
Including small breathing resistance, light weight, hygienic wearing, and convenient maintenance, such as wearing an arched dust mask.