The epidemic in China is still not over, and prevention is still very important. Even after the epidemic is over, for the sake of our health, we should form the good habit of wearing masks, and masks will become one of our indispensable single products. Classify masks by function: 1. Common masks: such as cotton masks, activated carbon masks, gauze masks, etc., can be used for anti-freezing, dust-proof, partial anti-haze, but can not be used to prevent the spread of bacteria and viruses; 2. Ordinary medical masks: they are less protective than surgical masks and can be used in non-dense crowds; 3. Medical surgical masks: the protective effect is much better than ordinary ones. They were used in hospitals before and are often used in respiratory and surgical operations to prevent the spread of germs and bacteria. 4.N95 mask: The domestic standard of N95 is KN95.N95 mask is more reliable in preventing haze, and the main component of haze is PM2.5, which is non-oily particles. At the same

The birth of the mask: from the prevention of the mask to the prevention of surgical infection, mainly in the mask filled with spices, herbs to eliminate the so-called toxic air. During the "Black Death" plague, for example, doctors would practice not only from head to toe, but also wearing beak-like masks. By the 18th century, the practice had been phased out. The origin of surgical masks we see today can be traced back to the understanding of infectious factors in the field of surgery. Surgical masks were originally created to protect surgical patients from surgeons contaminating their wounds. In the 1880s, surgeons came up with aseptic procedures, which amounted to moving the gate forward to prevent infection at source. This clearly poses health challenges in the surgical environment, including the risk of infection from the doctor's hands, instruments and even breathing. Johann Mikulicz, then head of surgery at the University of Breslau (now Wroclaw University, Poland), and his team demonstrated that respiratory droplets could carry live bacteria. Based on these findings, Dr. Mikulicz began wearing masks in 1897. In his description, a mask is "a piece of gauze tied with two strings to a hat that covers the face to cover the nose, mouth and beard." In Paris, France, surgeons began wearing masks in operating rooms that same year.

Wearing a mask correctly is an effective means to block the spread of respiratory secretions. Medical masks have the equivalent function of resisting liquids, filtering particles and bacteria, and are a kind of medical protective textiles. According to performance characteristics and scope of application, medical masks can be divided into: medical protective masks, medical surgical masks, and ordinary medical masks. During the epidemic of new coronavirus pneumonia, it is recommended that everyone choose medical surgical masks. The correct way to wear them is as follows: A. Wash your hands before wearing the mask, and avoid touching the inner side of the mask with your hands during the process of wearing the mask to reduce the possibility of contamination of the mask; B. When wearing, distinguish the inside, outside, top and bottom of the mask. The light-colored side is inside and the dark side is facing out. One end of the metal strip (nose clip) is above the mask, and the folded surface is fully unfolded; C. Put the side with the nose clip up, wrap the mouth, nose, and lower jaw, adjust the lower end of the mask to the proper position of the lower jaw, hang the elastic bands on both sides of the ears or tie the straps at both ends to the back of the head , And then squeeze the nose clip to make the mask fit the face completely and minimize the gap between the face and the mask.

Personal protection is very important to prevent the COVID-19. The most important thing in personal protection is to wear a mask. So what kind of mask should be worn to prevent the COVID-19? Most people recommend medical surgical masks, and a few people (such as medical workers) recommend medical protective masks (Medical N95). First of all, our daily commonly used masks include general medical care masks, medical surgical masks and medical protective masks. The protection requirements of these masks are different, and the applicable people are also different. Medical care masks. The technical application standards of medical care masks need to meet the technical requirements of YY/T 0969-2013. This type of mask is characterized by a filtration efficiency of >95% for bacteria, but has no filtering effect on body fluids, blood and other liquids. General medical environment where body fluids and blood are splashed. For ordinary people, if they are in places that are not too crowded and there is no risk of body fluid splashing, they can use medical care masks to prevent new coronavirus infections. The price of medical care masks is the cheapest compared to other medical masks. Medical surgical mask. The technical requirements for medical surgical masks must meet the technical standards of YY

KF94 masks filter more than 94% for particles with an average diameter of 0.4μm, and N95 masks filter more than 95% for non-oily particles with a diameter of 0.3μm. The two standards have different data parameters. One comes from the Korean Food and Drug Administration (MFDS). One is from the National Institute of Occupational Safety and Health (NIOSH). KF94 masks filter more than 94% for particles with an average diameter of 0.4μm, and N95 masks filter more than 95% for non-oily particles with a diameter of 0.3μm. The two standards have different data parameters. One comes from the Korean Food and Drug Administration (MFDS). One is from the National Institute of Occupational Safety and Health (NIOSH). Protection ability KF94: It can filter out at least 94% of particles with a diameter of 0.4μm, and both oily and non-oily particles can reach the same level. The anti-splashing ability and the bacterial filtering ability are not required. N95: It can filter out at least 95% of particles with a diameter of 0.3μm, only non-oily particles. Anti-splashing ability and bacterial filtering ability are also not required. Comparison: In comparison, N95 grade filter particles are better (filter diameter and filtration rate are better than KF94), but KF94 has more requirements for oily particle filtration than N95. In addition, the two non-medical masks do not have re

N95 mask is one of the nine standards formulated by NIOSH in 1995. "N" means "not resistant to oil". "95" means that when exposed to a specified number of special test particles, the particle concentration inside the mask is 95% lower than the particle concentration outside the mask. Among them, the value of 95% is not the average value, but the minimum value. Other anti-particulate mask levels certified by NIOSH also include: N99, N100, R95, R99, R100, P95, P99, P100, these protection levels can cover the protection range of N95, where "R" refers to, suitable for oily or non-oily For particulate matter, if used for the protection of oily particulate matter, the use time should not exceed 8 hours; "P" means that it is suitable for oily or non-oily particulate matter. If it is used for oily particulate matter, the use time should follow the manufacturer's recommendation. And "99" and "100" respectively refer to the filtration efficiency level. According to the oil resistance, it is classified into "N", "R", and "P". According to the capture rate, it is classified into "95", "99" and "100". "R" means "resistant to oil", "P" means "oil proof", "99" in the capture rate means more than 99%, and "100" means more than 99.7%. In addition, when the N100, P100, and R100 masks are tested with 0.3 micron particles, the barrier efficiency must reach 99.7% or more. N99, P99, and R99 are all filtration rates above 99%, and N95, P95, and R95 are all filtration rates. Above 95%. Therefore, the N95 mask is tested with 0.3 micron sodium chloride particles, and the barrier rate must be above 95%. When the wearer's face is tested for tightness, it is ensured that air

Common masks are cup-shaped and folding masks. The only difference is the cotton used between the two. Cup-shaped masks usually use needle-punched cotton, relying on a pre-molded structure to support filtering and shaping materials. The raw material of needle-punched cotton is polyester fiber, which adopts needle-punching process, which has the advantages of light weight and easy shaping. Needle-punched cotton also has the functions of filtration, low toxicity, and odor removal, and it also has the advantages of breathability, comfort, hygiene, convenience, safety, and beauty. Needle-punched cotton can be made into different styles to make cup-shaped masks of different sizes. It can be made into an arch shape to ensure a good fit with the face shape and retain a certain amount of space to make the wearer feel comfortable. Folding masks usually use hot-air cotton, which has good warmth and protection effect, and has high bulkiness, large elasticity, soft texture, strong warmth retention, good air and water permeability, and mainly plays the role of heat preservation, heat insulation, moisture and moisture prevention . Foldable dust-proof masks have better fit than cup-shaped masks, and can be individually packaged. They are also easy to carry when not in use, which is very convenient.

FFP2 masks refer to masks that meet the European (CEEN149:2001) standards. The European standards for protective masks are divided into three levels: FFP1, FFP2, and FFP3. The difference from the American standard is that its detection flow rate adopts 95L/min, and DOP oil is used to generate dust. EN 149:2001 +A1:2009 is the testing standard for export to the European Union, and the export of masks to the European Union must apply for the European Union CE certification. CE certification CE certification is the [main requirement" that constitutes the core of the European directives. It was formulated and implemented in the [Resolution on New Methods of Technical Coordination and Standards" issued by the European Community (85/C136/01) on May 7, 1985. The purpose of the directive "main requirements" has a specific meaning, that is, it is limited to the basic safety requirements of products that do not endanger the safety of humans, animals and goods, rather than general quality requirements. The coordination directive only specifies the main requirements, and the general directive requirements are standard tasks. In the EU market, the "CE" mark is a compulsory certification mark. Whether it is a product produced by an EU enterprise or a product produced in another country, if you want to circulate freely on the EU market, you must affix the "CE" mark to indicate the product It complies with the basic requirements of the EU Directive "New Methods of Technical Coordination and Standardization". This is a mandatory requirement of EU law on products. The significance of the CE mark is to use the CE acronym as a symbol to indicate that the product affixed with the CE mark meets the essential requirements

Disposable non-woven masks are recommended to prevent onward transmission in the general population in public areas, particularly where distancing is not possible, and in areas of community transmission. This could include the school grounds in some situations. Masks may help to protect others, because wearers may be infected before symptoms of illness appear. The policy on wearing a mask or face covering should be in line with national or local guidelines. Where used, masks should be worn, cared for and disposed of properly.