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How often do kn95 masks change? Kn95 mask can be used for 3 days in general, but doctors recommend changing it every 4 hours, and changing it every 1-2 hours in crowded places. If the kn95 mask is contaminated, for example, in a crowded place, if you sneeze or cough on the opposite side, it is contaminated and needs to be replaced in time. The medical kn95 mask can be used for 3 days, but under the current situation, it is recommended to replace it every 4 hours, depending on the surrounding environment. If you are wandering in the community, you can wear kn95 mask many times and change it once a day. However, if you go out to a crowded place, it is recommended to change it every 4-6 hours, 2 masks a day.

Disposable masks usually take 6-8 hours. After this time, it needs to be replaced. It should be noted that both sides of the mask cannot be replaced. Many people ask why the outer layer of the mask accumulates a lot of dust, bacteria and other dust in the outside air, which hinders the user's breathing. If replaced, the outer layer of dirt into the respiratory tract, affect human health. Disposable mask is also a common name. In short, medical disposable masks can be divided into: medical protective masks, medical surgical masks and general medical masks. Which kind of protective mask is good? The protective grade of medical mask is low. From the point of view of production specifications, this kind of mask is generally lack of filtration power requirements for particles and bacteria. Therefore, the general medical mask is only suitable for blocking the saliva exhaled from the mouth and nose. The medical surgical mask with medium protection level can block most bacteria and some viruses, which can not only prevent people from being infected, but also avoid some bacteria in the exhaled gas. Respiratory protection can only reduce the risk of disease, but can not completely eliminate the risk. We should know that prevention and treatment are sometimes two things, reducing risk and eliminating risk are two things. Medical protective masks can not completely isolate pathogens. According to the protection power and scope of application, medical disposable mask manufacturers are mainly divided into medical general mask, medical surgical mask and medical protective mask.

With the rapid development of science and technology, people pay more and more attention to environmental problems. Many people wear protective masks when they travel to avoid absorbing the dust in the air into the human respiratory tract, resulting in breathing difficulties. But do you know the protective principle of protective masks? Protective materials are mainly natural fibers, mineral fibers or synthetic fibers used to filter particles in the air. There are five kinds of filter material fibers that can filter particles in the air. They can work together, including sedimentation, inertial impact, interception, diffusion and static electricity, Under the action of air flow, when it rises and falls into the filter material of the mask under the influence of gravity, it can be separated from the air flow. When the particles bypass the fiber blocking in front of the air flow, some higher particles will be affected by inertia due to too much weight, deviate from the direction of the previous air flow and collide with the filter element to be filtered. The role of interception is to rely on the airflow in the pipeline close to the filter material, so that its radius is greater than the distance between the streamline and the filter material to be intercepted. Diffusion is mainly due to the thermal movement of molecules in the air. Some tiny particles, impacted by molecules in the air, constantly change the direction of their movement, showing Brownian motion. They randomly touch the filter material of the protective mask, and then they are filtered down. If the protective mask contains weak static electricity, no matter whether the particles in the air have electrons or not, when they are close to the protective mask, they will be attracted by static electricity and filtered down. Static electricity can help to protect the mask and improve the filtration efficiency without increasing resistance. When we get a protective mask, we first gently pinch the nose clip in the protective mask and put the mask on our face to ensure that the protective mask can cover our nose and mouth. Next, tie the upper elastic band into the head to prevent air from entering our mouth and nose. Then tie the summer elastic band around our neck. When using the protective mask, open the mask completely to avoid breathing difficulties due to too thick mask when reducing breathing. And the ear hanging mask directly through the ear band with both hands, put the nose clip on our nose, and put the mask on our nose and mouth

Generally speaking, the higher the number of layers, the better to use the razor, because the number of layers not only covers a larger area, but also makes it more comfortable and safe to use. But how you choose it depends on your personal preference. Compared with the 3-layer blade, the 5-layer blade is the most popular one, because the 5-layer blade is more comfortable, covering a wider area in the human chin than the double-sided blade, and it is safer to use. Before the hot water is softened and scraped, foam or gel will be used to shrink pores. After the condition is bought, the water will be more shaving if there is more water. I started the three layer, and later changed 5 layers. That is a qualitative leap, but the knife head is more expensive.

Is disposable mask two-layer or three-layer? 1. Different uses 1. Two layer mask: two layer mask is suitable for electronic factory and daily life. 2. Three layer mask: three layer mask can be used in electronic manufacturing industry, dust-free workshop, catering service industry, food processing, school, motorcycle, spray processing, stamping hardware, health center, handicraft industry, hospital, beauty, pharmaceutical, factory, environmental cleaning, electronic factory, steel and iron factory, printing factory and other purposes. 2. The advantages are different 1. Second layer mask: the second layer mask is light in texture; It is very elastic and can be reduced after stretching; Low price, suitable for mass production. 2. Three layer mask: the ventilation of three layer mask is very good; It can filter poisonous gas; It can keep warm; It can absorb water; Waterproof; It is flexible; Not messy; It feels very good and quite soft. 3. Different layers of disposable masks 1. Two layer mask: two layer mask is made of two layers of non-woven fabric. 2. Three layer mask: the three-layer mask is made of two layers of fiber non-woven fabric which is used for medical and health care, and one layer is added in the middle. The filter solution spray cloth which has the function of filtering and anti bacteria up to 99.999% is welded by ultrasonic wave.

1. According to the composition of non-woven fabrics, there are polyester, polypropylene, nylon, spandex, acrylic, etc; Different components have different styles of non-woven fabrics. 2. Melt blown fabric is mainly made of polypropylene, and the fiber diameter can reach 1 ~ 5 microns. More air attacks, fluffy structure, good wrinkle resistance. Melt blown fabric, also known as melt blown non-woven fabric, is a kind of non-woven fabric containing relationship, but generally speaking, non-woven fabric does not refer to melt blown fabric. Kn95 is made of non-woven fabric and melt blown fabric.

In our daily life, protective masks are often used as respiratory protective equipment, which can prevent respiratory tract from being infected by microorganisms, so as to achieve the purpose of protecting human health. Do you know how to classify protective masks? What's the difference between the masks we use in our daily life? Protective mask in daily life is more common is the daily protective mask, its mask body is the filter material wearer, is to rely on breathing to overcome the resistance of the filter material to the air flow, so it is also known as the self-priming filter respirator. In the process of breathing, the low pressure inside the mask will make the air flow into the mask. When exhaling, because the pressure inside the mask is much higher than the ambient pressure, the air flow can be discharged through the mask. When the filter material used in the mask meets the relevant standards, the mask can not fit the user's face enough, so most of the air flow will be filtered out through the filter material, but the protective material used in daily life can not fit the face completely, Because it has a direct impact on the smoothness of the human face and whether there is hair pad under the mask. However, most of the particles inhaled by wearing the daily protective mask come from leakage, so whether the daily protective mask fits or not is the key to ensure whether the filter material can play an important role. In order to reduce the leakage of the protective mask, the three-dimensional structure is adopted in the design, and the pressure is exerted by the headwear and wallet, so that the mask and the face can be closely fitted together. Daily protective masks can be divided into dust masks and gas masks. The main function of dust masks is to prevent harmful dust aerosols from entering the human respiratory tract. Most of the dust masks are cup-shaped, which can effectively fit in the mouth and nose of the human body, so as to achieve the effect of dust prevention. They are used to block the dust or exhaust gas in the air, But it can't get rid of the germs in the air, and the anti-virus mask is a kind of protective equipment to prevent the respiratory organs from being injured by microorganisms or radioactive dust. The protective mask often used in hospitals is medical protective mask, which is composed of mask face and tension band. The mask part is divided into three layers, namely inner layer and outer layer. The inner layer is made of non-woven cloth or ordinary sanitary gauze, while the middle layer is made of ultra-fine polypropylene fiber material, while the outer layer is made of non-woven cloth. This kind of protective mask has strong air permeability and obvious filtering effect on some powerful aerosol or dust with micro virus.

General razor blade material is mainly made of 3Cr13, 4Cr13 martensitic stainless steel, after precision processing, rolling into 0.3/0.4mm stainless steel sheet, after slitting, finally after processing blade can be used. The high-end razor blade is made of 6r13. Due to the increase of carbon content, the hardness is better. The hardness and machinability of martensitic stainless steel are improved by quenching and tempering.

1. Skin care products Generally travel, whether it is long-term or short-term, you can choose small tourism type make-up bag, which is very convenient to take, but also can avoid leakage in the bag, and it is easy to put them in order, if you usually have a special counter to buy Gift samples, you can save them, so that you can use them more convenient when traveling. Skin care products in general cosmetic bags contain moisturizing water, make-up water, lotion and some cream. Eye cream is very important. Even during the journey, eye care can not stop. If there are some special needs, such as freckle cream and some beauty equipment, such as lifting and anti wrinkle beauty equipment, you can put it in the cosmetic bag and use it when traveling. It is good for skin maintenance when you are tired. 2. Cosmetics Make up the most important is eyebrows and lipstick, so be sure to bring a common eyebrow pen, and then bring two or three different colors of lipstick is enough. Besides eyebrow pencil and lipstick, you should also bring some foundation liquid, so it is convenient for you to make up any makeup at any time. If you have already set the makeup, you can bring an air cushion, so it is very convenient to make up makeup. Of course, if there are some special requirements for makeup, then it is enough to take a mascara and prepare some eye shadow to cope with the daily makeup. Cosmetics are usually small in size. The most important thing to put them in the cosmetic bag is to put them in order to avoid sprinkling them in the cosmetic bag and make them easy to use.

Cosmetic bags are all kinds of bags for make-up, such as mascara, lip gloss, powder, eyebrow pencil, sunscreen cream, oil absorbing paper and other cosmetic tools. According to the function, it can be divided into multi-functional professional cosmetic bag, tourism simple cosmetic bag and household small cosmetic bag. According to the material, make-up bags can be divided into nylon cloth, cotton cloth, PVC and PU. 1. Professional cosmetic bag Multiple functions, multiple compartments and storage bags. It is mainly used by professional makeup artists. 2. Tourist cosmetic bag It's usually easy to carry. There are few divisions, but the functions are complete. Can be placed commonly used cosmetics and toiletries. 3. Household small cosmetic bag Styles and varieties are ever-changing. Color and quality are also uneven, more small cosmetic bags are promotional products of cosmetic companies. Gifts when purchasing cosmetics.

Although disposable masks are common in the market, they are "disposable" in principle. However, Jin Xiangyu said that as long as in most life scenes such as "non hospital", such masks can be used two to three times, "but it is not recommended to use them n times.". For example, if you take a walk inside and outside the community, you can take off the mask after you go home, put it in a ventilated environment, air or dry it naturally, and prevent the accumulation of bacteria on the surface, and then you can use it again. Disposable masks are not washable.

First of all, we will make a classification of the types of commonly used masks, non-woven masks can be divided into three kinds (what is non-woven masks, please Baidu), each style is used in different places. One is a two-layer mask. Generally, the two-layer mask is mainly used in food processing plants. There is no filter melt blown cloth in the middle, but two pieces of non-woven cloth are sewn together. Its main function is to prevent the substances in the mouth from entering the food, such as saliva, snot, cold and so on. Its gram weight is generally about 2 ~ 4.5g. The second is a three-layer mask, its interlayer is a filter meltblown cloth, suitable for medical structure and outdoor, dust factory and other places. It consists of a double layer of non-woven fabric and a middle layer of filter melt blown fabric. The third is a disposable four layer activated carbon mask, which adds a layer of activated carbon paper on the premise of the original three-layer non-woven filter paper, which better improves the ability of filtering dust bacteria. That's the gray black mask you see. But it's enough to wear a three-layer mask outdoors. Of course, it's OK to wear a four layer mask outdoors. matters needing attention 1. Disposable masks should be used within the validity period. 2. It can only be used once and destroyed after use. 3. The package is damaged. It is forbidden to use. 4. Pay attention to production

1. How to increase the use time of disposable mask, put ordinary gauze or cotton cloth mask inside, and then put disposable medical mask outside. Since the disposable mask is not affected by saliva and steam, the disposable mask can be hung in a ventilated place after returning home. In this way, the service life of the disposable mask which can only be worn for 4 hours can be extended to 3-5 days. 2. How to sterilize masks 1 A. Dry heat disinfection method: prepare a pot, make sure the pot is dry (never put water), put on the steaming rack, turn on the fire, and burn the pot. When our hands touch the pot cover, we can turn off the fire (be sure to turn off the fire first), put the disposable mask on the steaming rack, and cover the pot. After the pot cools naturally, the disinfection is finished. B. Disinfection cabinet disinfection method: put the disposable mask into the disinfection cabinet, open the disinfection, after disinfection, use the ozone inside the disinfection cabinet to inactivate the virus, so as to play the role of disinfection. To sum up the disinfection methods of disposable masks, there are two principles, one is high temperature, the other is no water. 2. Sterilization and disinfection of gauze or cotton mask the principle of sterilization and disinfection of gauze or cotton mask is: disinfection before cleaning. Remember, don't get the order wrong. The mask made of this material is not afraid of water, and the disinfection method is relatively simple A. Boiling water disinfection method: after using gauze or cotton cloth mask, take it off, put it directly into the pot, add water, boil for three minutes, after three minutes of boiling water disinfection, pick it up, clean it, and then take it to air. B. Microwave oven disinfection: (warm tips, disposable masks should not be disinfected by microwave oven) wet the gauze or cotton cloth masks after use, put them into the fresh-keeping bag, then throw them into the microwave oven and sting for three minutes to complete the disinfection, and then clean and dry them after disinfection. It should be emphasized that disposable masks must not be disinfected by microwave oven. Disposable masks contain a metal strip, which is used to fix them close to the nose. Once this metal bar enters the microwave oven, it will melt and start a fire immediately!

Can disposable masks be disinfected by spraying medical alcohol and then reused? As for the problem of masks, ordinary residents use disposable masks in places with relatively low risks. When the masks are clean and the structure is complete, especially when the inner layer is not polluted, they can reuse them. After each use, it should be placed in a relatively clean, dry and ventilated room. In addition, spraying disinfectants, including medical alcohol, will reduce the protection efficiency, so it is not suitable to use alcohol to disinfect the mask. With regard to the reuse of masks, I would like to emphasize that there are still specific situations. For example, if you are alone, if you don't have contact with the outside world at home, if you can't wear a mask, if you are in a private car, or if you are alone outside, walking or walking in the community, a park without pedestrians, you don't need to wear a mask. However, in public places with intensive income and expenditure, patients who take buses, shopping malls, elevators and conference rooms and go to ordinary medical institutions (except fever clinics) can wear ordinary medical masks, which is what we call disposable medical masks. In this case, the mask can be reused at home in a clean, dry and ventilated place. It is suggested that medical masks should be worn by professionals, administrators, correspondents, security personnel, express delivery personnel engaged in epidemic related work, so as to extend the operation time and change frequency. Masks should be based on the actual situation. In general, if the mask is not significantly dirty and deformed, it cannot be replaced every four hours, but this is wrong. If the mask becomes dirty, deformed, damaged or smelly, it needs to be replaced in time.

Choosing a harness for your dog can be a confusing and costly process, especially if you don`t know what you should be looking for. Harnesses are a great option to use for walking your pup, especially if they tend to pull on the leash or have trouble with their respiratory system. The following guide was designed to provide tips and information regarding harnesses and their uses. Types Of Dog Harnesses Step-in Harness: This harness involves your dog stepping into the harness, and the leash connects at the top. There is much less risk of your dog being choked this way, as the weight and pull of the leash will be distributed along the body as opposed to only the throat. This type of harness is best for obedient dogs of all shapes and sizes because the harness can be adjusted. Standard Harness: This harness slips over the head and snaps closed around your dog`s body. There is a neck enclosure, which provides weight distribution. The additional, adjustable shoulder straps can relieve neck pain, if present. This harness is best for small breeds and well-behaved pets that don`t get overly excited for [walk time," as it may be hard to put on. Vest Harness: Most often used with smaller dogs, these leashes enclose the torso in fabric. It is important to choose fabric that will be comfortable for your dog, so make sure to take their fur type into account. Additionally, there is no pressure on the dog`s neck, which is a great feature. Car Harness: Great for families that love to include their pets on family excursions or vacations. These harnesses can ensure the safety of traveling by providing a built-in seatbelt loop. Built-in Leash Harness: The built-in leash harness provides extra and quick control of your pet, such as during trips to the veterinarian. Most of these leashes also contain a D-ring that allows for the attachment of a regular leash to the harness for casual walks and strolls with your pup. These are best for large and active breeds that can become skittish in social settings. What People Are Saying Fabric material. Many people gave great reviews to harnesses that have durable material, as well as a fabric that felt great for their pup. It is important that your dog is fit with the proper harness size and that the fabric used (especially around the underarms) does not squeeze and cause irritation to your dog`s skin. Size. Many companies have different sized harnesses, and these sizes are not on a general scale. It may be helpful to bring your dog in to try on certain sizes before ordering online to save the hassle of returning it if it does not fit. Control. While getting exercise with your dog, it is key to maintain control in all situations. If your dog likes to pull and chase after squirrels, you want to make sure the harness will be durable to handle the force exerted. It can also be detrimental to your dog`s health should you choose a harness that restricts their normal movements. Dean & Tyler offer quality products, in which many of the harnesses have wider straps and oversized buckles to ensure extra protection and control over your dog.

A dog pulling on a harness or leash is a bigger issue than many pet owners realize. If you have an issue with your dog pulling, switching to the best no pull dog harness will prevent injuries both to you and your dog. We've tested many dog pulling harness brands to see how they perform, and reviewed several others to pick the best dog harness for dogs that pull. Why a no pull dog harness is better than a leash? Surprisingly to some, picking the best no pull dog harness over a leash or even a regular harness for dogs has been scientifically proven to prevent injuries in dogs. Over the last decade, dog leash pulling as a safety hazard has raised concerns among pet owners and canine professionals alike. There's a lot of research on this subject which we will examine below, but let's take a look at one of the papers on the dangers for dogs' eyes. On study has evaluated 26 dogs pulling against a leash with a collar and then pulling against a harness. The results were not surprising: leash damaged several of dogs' body parts and was especially dangerous to dogs with glaucoma and thin corneas. A no pull harness for dogs did not affect them in any way and was a safer option.

Lightweight material: the weight of the material is also a factor that must be considered. The lighter the material, the less burden it will cause to carry. The cosmetic bag made of cloth and plastic cloth is the most lightweight and convenient. In addition, the best choice of skin wear-resistant material, do not have too much decoration, in order to use a long time. two Multi layer design: because the items in the cosmetic bag are very small, there are many small things to put, so there is a layered design style, which makes it easier to put things in different categories. At present, the more and more intimate cosmetic bag design even separates the lipstick, powder puff, pen like tools and other special areas, so many separate storage, not only can clearly place things at a glance, but also can protect them from collision and injury. three Choose a style that suits you: at this time, you should first check the types of things you are used to carrying. If most of the items are pen like items and flat color make-up plates, the wide flat and multi layered style is quite suitable; If it is mainly divided into bottles, you should choose a cosmetic bag with a wider side view, so that the bottles can stand at attention, and the liquid inside is not easy to leak out.

If we don't have direct contact with serious patients, we can use disposable masks. The disposable three-layer mask is made of two layers of non-woven fabric and filter paper. The disposable three-layer mask is made of two layers of non-woven fabric for medical and health care. A layer of filter solution spray is added in the center, which can achieve more than 99% filtration and antibacterial effect through ultrasonic welding. The bridge of the nose is made of environmentally friendly plastic tape and does not contain any metal. If the mask is used for a long time, the large particles will be blocked on the surface of the mask, or the ultra-fine particles will block the open space of the mask's filtering data, which will lead to the reduction of filtering efficiency and filtering efficiency. The rise of respiratory resistance. If the method is not correct, it will affect the use. Disposable masks are lighter in color, not inward, that is, the lighter side of the mask is close to our face. One end of the strip is above the mask. The mask is not suitable for long-term wearing. Long term wearing of the mask will make the nasal mucosa become fragile and lose the original physiological function of the nasal cavity, so it can not be worn for a long time. Masks can only be used in special environments, such as in places with large population and poor ventilation. Disposable medical masks can not be cleaned, disposable masks can not be reused.

1. Cleaning. First, gently wipe the gauze mask with warm water and soap. You can use a soft brush dipped in detergent to gently brush the dishwashing mask, and then clean it with clean water. Please be careful not to rub with force, because if the warp and weft gap of the screen is too large, the anti dripping effect will be lost. 2. Disinfection. Soak the cleaned mask in 2% Peracetic Acid Solution for 30 minutes, or boil in boiling water for 20 minutes, or steam in a steamer for 15 minutes, then dry. This method is suitable for gauze mask and bowl mask. 3. Inspection. Before reuse, carefully check whether the mask and mask are still in good condition. For gauze masks and masks, the method of light transmission inspection can be adopted, that is, take good care of them in front of the lamp to see whether there is obvious light spot, and whether the light transmission of the central part is consistent with the edge part. If in doubt, you need to replace them with new ones. In any case, the mask and mask will be renewed after 3 to 7 times of cleaning, and the mask with excellent quality can be cleaned 10 times. The activated carbon adsorption mask should be replaced regularly. If the activated carbon interlayer cannot be replaced, it should be replaced after 7 to 14 days. This kind of mask can't be reused after cleaning.

In general, the positive and negative differences of medical masks are still large, and the specific differences are as follows: medical masks mainly include medical masks and N95 masks, and the positive and negative differences of medical masks have certain difficulties, especially the masks with the same color on both sides. Medical masks can be directly distinguished by color. Usually, the color may be dark, which is the front of the mask, that is, the outer layer. Wear it facing out. Disharmony (inner layer) is usually white or light. Secondly, the difference can be achieved by masking the texture. Usually, the inner layer of the mask is soft because it's close to the skin. The outside is usually waterproof and splash proof and hard. Usually, through the above two methods, we can distinguish the positive and negative of medical masks. Before wearing a medical mask, use soap or disinfectant, hand sanitizer and active water to ensure hand hygiene, and then wear the mask. There are many kinds of masks on the market, and their names are very similar, such as disposable protective masks, disposable medical masks, medical surgical masks, etc. In addition, there are fake and shoddy products. How can we tell if they are medical masks? When choosing masks, we should pay attention to the manufacturing information of masks and the implementation specifications on the packaging bags to judge whether they are medical masks. Both medical surgical masks and disposable medical masks need more than 95% bacterial filtration capacity, but the diameter of medical surgical masks is 0.3 μ The filtration capacity of non oily particles is more than 30%, and the fluid resistance of blood, body fluid and other splashes (droplets) can reach 120 mmHg, while disposable medical masks have no such requirement.