Home > Products > Protective Face Mask > Personal Protective Mask Cotton Can Be Cleaned Repeated Use Virus Protection Bacteria Thin Air Permeability E-PTFE Nanofiltration Steam-Washable Idoesn't Reduce
Personal Protective Mask Cotton Can Be Cleaned Repeated Use Virus Protection Bacteria Thin Air Permeability E-PTFE Nanofiltration Steam-Washable Idoesn't Reduce
Breathing Protection Knowledge1,Do you know? There is a big problem with the quality of melt blown cloth for masks Now, most masks on the market use melt blown cloth as the filter material. Conventional melt-blown cloths rely on their fibrous tissue voids to absorb particulate matter. Therefore......
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Breathing Protection Knowledge
1,Do you know? There is a big problem with the quality of melt blown cloth for masks
Now, most masks on the market use melt blown cloth as the filter material. Conventional melt-blown cloths rely on their fibrous tissue voids to absorb particulate matter. Therefore, the filter needs to be increased in thickness to improve filtration efficiency. As the thickness of the filter increases, its respiratory resistance will also increase. In other words, wearing a qualified melt blown cloth mask will be very dull. Before the epidemic, the filtration efficiency of melt blown cloth masks reached more than 95%, and it was necessary to install a breathing valve to help avoid strong breathing. Now the melt blown cloth masks on the market are very thin and breathable. This is because the melt blown cloth produced now uses the process of injecting extremely static electricity. Relying on static electricity to absorb particles to achieve high efficiency and low resistance. In theory, electrostatic adsorption of particulate matter is feasible. The newly produced melt blown cloth has good data detected. The filtration efficiency can reach more than 99%, and the resistance can reach about 100Pa. However, static electricity has a fatal disadvantage, that is, static electricity will decay quickly.
There have been tests in the industry. When the melt blown cloth mask is opened and exposed to the air for 2 to 5 hours, its filtration efficiency will drop below the standard. When exposed to the air for about 40 days, the static electricity is lost. If stored in a high humidity and high temperature environment, the decay period will be shortened exponentially. Once the static electricity is lost, the mask will have no protective effect. This is also the real reason for a large number of unqualified returns of masks sold abroad during the epidemic.
After the problem of electro-injection melt blown cloth was exposed, another kind of melt blown cloth called water-injection electrode appeared on the market recently. The process has been upgraded, but it is only a little bit stronger with extremely static electricity. The aging of its static electricity can only be extended to about three months. Some mask factories advertise that the validity period of water-injected polar melt blown cloth masks can reach two years. This is all bragging. Think about it, everyone, that is, high-energy storage batteries store enough energy, and within a year it will be lost.
2,Most people don't know that this technical indicator of masks really shows the anti-virus effect, not the penetration rate.
After the arrival of the new crown epidemic, everyone has a certain understanding of masks. The two main technical indexes of respirator, filtration efficiency and respiratory resistance, are also known. When you choose a mask, you will first know how much its filtration efficiency is. It is believed that the higher the filtration efficiency of the mask, the better the anti-virus effect will be. That's true, but not all. What is the situation? To understand this situation, we should start with the transmission form of particles (viruses belong to fine particles) in the atmosphere.
There are two ways of spreading particulate matter in the atmosphere. One is called splash particles. For example, the spit produced by our speech and the flying dust produced by grinding wheels are all flying particles. The splashing particles all move at a relatively fast speed, almost linear trajectory. Therefore, it is very simple to protect against this kind of particles. Just add an obstacle in front of the nose to cover it and it will have a good protective effect. Most protective masks have a good protective effect on this; the other is called diffuse particulate matter. This kind of particulate matter is generally relatively fine and can float in the atmosphere for an irregular long time. It can pass through holes or gaps with a larger diameter and any angle without any obstruction. Where the naked eye appears to be almost tight, there is no blocking effect on the floating fine particles, and it can still be "unblocked." To prevent diffuse particulate matter, the only way is to make the mask tightly, leaving no gaps. Under the premise of high filtration efficiency, the tightness can be really blocked to block diffuse particles. Otherwise, no matter how high the filtering efficiency of the mask filter is, the tightness of the wearing is not good, and its protective effect is not great.
According to the protection of diffuse fine particles (PM2.5, viruses, etc.), my country's latest national standard for civil masks GB/T32610-2016 "Technical Specifications for Daily Protective Masks" specifies the technical indicators of "protective effects". That is, the closeness of the mask to the face after wearing. And formulated clear requirements for this indicator. At present, GB/T32610-2016 daily use masks are the only standard that clearly defines the "protective effect" in the national standards for masks in various industries in my country. After the mask is made with a high degree of tightness, almost all the channels for breathing enter and exit through the filter. Therefore, the GB/T32610-2016 daily-use mask has the highest requirement for breathing resistance (see Appendix 1 for data comparison). Nowadays, the society has the lowest recognition for high-demand daily-use masks, while the recognition for the medical and surgical flat masks with the lowest standards is higher. What is your opinion on this strange phenomenon?
With an understanding of the form of particulate matter spreading in the atmosphere, your judgment on the protective effect of masks should have improved. For those masks without filters, masks with insert filters, and masks with large gaps around them after wearing them, you have an idea whether they can block the virus. (Jiu An Dun respiratory protection expert)
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