Question 2: What is the unit of the mask? I think I have to use a mask! None of them are suitable and none of them are suitable.
Tmall USA imports Puweixin.
Question 3: What is the unit of measurement for masks? I came in and sent a message, and then I left silently. You'll never understand how I feel.
Question: What unit is used to measure PM2.5? Speaking of PM2.5, many people are curious. How are such small particles measured? Yesterday, the reporter visited the Caochangmen site in Nanjing.
Filter particles are "screened" to measure concentration.
Caochangmen air quality monitoring national control point is located on the sixth floor of Nanjing Environmental Monitoring Center Station.
This point is not set at random. The basic requirements of the country are the height of 15-20 meters, air circulation, no tall buildings around, and no obvious pollution sources such as chimneys and stoves. The height of the platform in front of us is about18m. At first glance, there is no high-level shelter, which meets the requirements of national control points.
The reporter learned that the monitor is roughly divided into three parts: sampling head, channel and oscillation analyzer. Except that the sampling head is placed high on the roof, other parts are "lived" in the house.
The top of the sampling head is similar to a "torch", which is specially used to hold air samples, which is also the magic of this equipment. The professional name of this "torch" device is "cutting head".
The cutting head is like a sieve. The "sieve" of PM2.5 is more delicate, and only particles with a diameter less than or equal to 2.5 microns are screened. "Just like a fisherman fishing. How big do you want to catch? Just adjust the size of the fishing hole. " The staff said that the reasons for monitoring PM 10, PM2.5 and PM 1.0 are the same, that is, the "filter screen" is different, and the particles passing through it are different in size.
Enter the "microwave oven" and weigh PM2.5 with a balance.
"The monitoring station imports more than 200,000 instruments for monitoring inhalable particulate matter from the United States." The staff said.
After entering the pipeline, PM2.5 particles will be transported to the "automatic air quality monitoring system". The PM2.5 monitor looks like a microwave oven and is square. Above is an electronic display screen, where the real-time data of six monitoring indicators jump.
The scientific name of PM2.5 analyzer is micro-oscillation balance monitor. After the PM2.5 collected and separated from the roof is sent to this monitor, it can be accurate to micrograms, and the weight of PM2.5 can be weighed. Then the program that comes with the instrument will analyze the concentration of PM2.5 per cubic meter of air.
"Our instruments are very advanced and have the ability to monitor and release in real time. You see, a set of real-time data of PM2.5 can be recorded every 30 seconds. " The staff told reporters.
The staff of Nanjing Environmental Monitoring Station said that the oscillating balance monitoring method can capture PM2.5 particles in the air in real time, and the monitoring data are displayed on the display screen according to the catalogue of half an hour, 1 hour, 8 hours, 12 hours and 24 hours. In addition, the monitoring equipment automatically monitors and stores the transmitted data 24 hours a day.
One site "manages" 5 kilometers of Fiona Fang.
Tmall Ivy reminds: Do a good job in dealing with smog weather. Wear American Puweixin mask to effectively prevent smog and protect respiratory tract from infection.
"The choice of monitoring location must be in an open position, and there are cars and people nearby. Each monitoring substation monitors air quality changes within 5 kilometers of Fiona Fang. " The staff told the reporter that the distribution of PM2.5 in the air is relatively uniform and the diffusion is even. Therefore, each monitoring point can represent the air quality of the detection area, not just each specific location. Therefore, the value will not be reduced because it is located in parks, scenic spots or places with better greening.
It is understood that the setting of monitoring stations should also consider the changing trend and diffusion direction of pollutants in the whole atmosphere, and more importantly, it can enable environmental protection departments to strengthen the management and monitoring of related emission enterprises and emission sources in the future, and provide scientific basis for joint environmental prevention and control in the whole region.
Question 5: Material characteristics of medical surgical masks: melt-blown cloth, with polypropylene as the main raw material, the fiber diameter can reach 0.5- 10 micron. These superfine fibers with unique capillary structure increase the number and surface area of fibers per unit area, so that meltblown fabrics have good filterability, shielding, heat insulation and oil absorption, and can be used as air and liquid filter materials, isolation materials, absorption materials, mask materials, heat insulation materials and so on. Spunbonded nonwovens: After the polymer is extruded and stretched to form continuous filaments, the filaments are laid into a net, and the net is transformed into nonwovens through self-bonding, thermal bonding, chemical bonding or mechanical reinforcement. High strength, good high temperature resistance (can be used in the environment of 150℃ for a long time), aging resistance, ultraviolet resistance, high elongation, good stability and air permeability, corrosion resistance, sound insulation, moth prevention and non-toxicity. The main products of spunbonded nonwovens are polypropylene polyester (long fiber and short fiber), and the most common and commonly used applications are non-woven bag packaging. And it is easy to identify because the rolling point of spunbonded nonwovens is rhombic. At the application level, it can also be used as flower packaging cloth, luggage cloth and so on. , with the characteristics of wear resistance and firm hand feel, is the best choice for making such products.
Question 6: What is the output value of DSM 501? Is it the concentration of PM2.5? Or the number of particles under what circumstances? What should the unit say? A dust detector based on 5 1 single chip microcomputer is composed of AT89C52, DSM50 1 and a simple LCD 1602. The equipment can be used to detect the amount of indoor PM2.5 per unit time, so that users can have a direct understanding of the indoor PM2.5 content. The main feature of this design is that it can detect the amount of particulate matter in the air in real time and provide more accurate values for people. It has the characteristics of real-time detection and real-time alarm, low price, small size, convenient carrying and installation, clear and intuitive detection results and so on. It is a product with low cost and high use value. The protection against PM2.5 can be achieved by using the professional protective mask imported from the United States-Puweixin, which can filter particles as small as 0. 1 micron up to 99.8%, and bacteria or virus carriers as small as 0.3 micron up to 99.9%.
Question 7: Can polyester cloth be used as a medical filter mask? I don't think so. The air-jet spinning fabric is mainly polypropylene, and the fiber diameter can reach 0.5- 10 micron. These ultra-fine fibers with unique capillary structure increase the number and surface area of fibers per unit area, so that melt-blown fabrics have good filterability, shielding, heat insulation and oil absorption, and can be used in the fields of air, liquid filter materials, isolation materials, absorption materials, mask materials, heat insulation materials and wiping cloths. Spunbonded nonwovens: After the polymer is extruded and stretched to form continuous filaments, the filaments are laid into a net, and the net is transformed into nonwovens through self-bonding, thermal bonding, chemical bonding or mechanical reinforcement. High strength, good high temperature resistance (can be used in the environment of 150℃ for a long time), aging resistance, ultraviolet resistance, high elongation, good stability and air permeability, corrosion resistance, sound insulation, moth prevention and non-toxicity.
The main products of spunbonded nonwovens are polypropylene polyester (long fiber and short fiber), and the most common and commonly used is the application of nonwoven bag packaging. And it is easy to identify because the rolling point of spunbonded nonwovens is rhombic.
At the application level, it can also be used as flower packaging cloth, luggage cloth and so on. , with the characteristics of wear resistance and firm hand feel, is the best choice for making such products. Ordinary masks should be useless, masks with good filterability and good sealing should be ok, and medical masks can be divided into ordinary and advanced ones. Ordinary medical masks are not expensive and the protection is not outstanding; Surgeons or dentists adopt advanced medical masks, which pay attention to the filtration of particles and the barrier of fluids, so as to ensure the breathability of wearing in a precise working environment. Haze refers to the haze caused by dust, sulfuric acid and nitric acid in the air. The difference between haze and fog is that the relative humidity is small when haze occurs, but it is saturated in fog (if there are a large number of condensation nuclei, the relative humidity may not reach 100%, and saturation may occur). Sources of toxic particulate matter in cities: firstly, automobile exhaust. Cars that use diesel have the highest emission standards. Medical masks imported from the United States, like Wei Xin who works in Beijing, have good filterability, not only preventing particles, but also preventing droplets. When choosing a mask, you can look at the standard and filtration efficiency. You should be familiar with 3X brand N90 and N95 series masks, both of which are named after NIOSH standard. In addition to NIOSH standard, ASTM standard of American Society for Testing Materials, KN standard of China and FFP standard of Europe are all universal and can be used to measure important indicators of masks. Ordinary medical masks are relatively cheap and have poor protection, and are basically only suitable for ordinary nurses or cooking at home. Advanced medical masks are adopted by surgeons or dentists, who earn more and pay more attention to the quality of masks rather than the low cost. Advanced medical masks have excellent barrier to particles and liquids, ensuring breathability when worn in precise working environment. It can also deodorize. Sources of toxic particles in cities: first, automobile exhaust, medical masks imported from the United States, and Puwei server, which have good filterability and prevent both particles and fog drops. The filtration efficiency is 99.8% for particles as small as 0. 1 micron, and 99.9% for bacteria or virus carriers as small as 0.3 micron (common in droplets). Adopt SecureFit patented technology, adjust to different face shapes to achieve a high fit. For the health of you and your family, wear a mask when you go out, with J's good style,
Question 8: What kind of mask should I wear to prevent second-hand smoke? Wearing a mask was once a method I used. In order to enhance the effect, I wrote the words "don't smoke secondhand smoke" on the mask, but the effect was not good, just slightly reduced the taste. After a long time, it is worse than directly smoking second-hand smoke. Now I don't use this method. I am trying to create a smoke-free environment for myself, because this is the only way to solve this problem.
WHO Policy Recommendations for Preventing Exposure to Secondhand Smoke: Chapter III (Secondhand Smoke Solutions)
Effective protection strategy
"100% indoor smoke-free environment"
There is no so-called "safe level" for secondhand smoke exposure. 14,15,54 Therefore, eliminating smoking in indoor environment is the only scientific measure that can fully protect people from the harm of second-hand smoke. Smoke-free environment can protect health. Where there is a smoke-free policy, the chances of exposure to second-hand smoke will be reduced and people's health will be improved. Smoke-free policy is also a cost-effective measure, especially compared with various ineffective "alternative measures" often advocated by the tobacco industry with the help of third parties. These so-called "alternative measures" include: 55
? Separate smokers from non-smokers in the same air environment;
? Set up a "special smoking area" to strengthen ventilation and filtration.
Invalid alternative measures
As for the measures to isolate smokers from non-smokers in the same air environment, it is impossible to eliminate the second-hand smoke exposure of non-smokers simply by isolating smokers from non-smokers without providing any isolation barrier from floor to ceiling. 56, 57, 58, 59, 60 Non-smokers' exposure to second-hand smoke in this space largely depends on factors such as airflow pattern, dilution volume, distance between smokers and non-smokers, and smoking volume. Almost without exception, heating, ventilation and air conditioning systems will return air from smoke pollution to non-smoking areas. A study on the environmental nicotine level in Latin America (an indicator of secondhand smoke exposure) even found that in some environments, the nicotine level in non-smoking areas is higher than that in neighboring smoking areas. 4 1 in addition, the research on the staff in non-smoking areas also shows that the exposure level of these staff to second-hand smoke is equivalent to that of the staff in smoking areas. 6 1、62
Set up a "special smoking area" to strengthen ventilation and filtration. Neither ventilation nor air filtration, whether used alone or at the same time, can reduce the exposure of tobacco smoke in indoor environment to a qualified level ―― this method can't even deodorize, let alone protect health. 63, 64 Although it is true that increasing ventilation rate can reduce the concentration of pollutants including tobacco smoke, it is necessary to increase ventilation rate to 65,438+000 times of conventional ventilation rate even for the purpose of deodorizing, 63 and odor is not an indicator to reflect the level of toxic substances in the air, because even if there is no obvious smell of tobacco smoke, the level of these toxic substances may still be high. Eliminating toxic substances requires higher ventilation rate to protect health, but such ventilation rate is neither realistic nor economical in practice. To achieve the purpose of removing toxic substances from secondhand smoke in the air, the number of air changes will be too high to operate, making people feel uncomfortable and economically unbearable. 65
Similarly, neither central air purification equipment nor local purification equipment can reduce the toxic substances of indoor second-hand smoke to a safe level. In addition, the working efficiency of these devices will gradually decrease over time, because they need high-level and expensive maintenance, and sometimes these devices may even become indoor pollution sources themselves. The "one-way" system advocated by the tobacco industry and its allies does not have the problem of circulating air, but for the same reason, the operating cost of this equipment is very high, because indoor air must be heated or cooled continuously. In addition, under any circumstances, the system itself cannot reduce tobacco smoke to a safe level. 66、67
order
Through learning health knowledge, I learned that tobacco smoke contains hundreds of known toxic or carcinogenic compounds, such as formaldehyde, benzene, vinyl chloride, arsenic, ammonia, hydrocyanic acid, etc., which can quickly * * * and damage the inner membrane of respiratory tract, so it was identified as a class A carcinogen by the US Environmental Protection Agency and the International Agency for Research on Cancer, and as an occupational carcinogen by the National Institute of Occupational Safety and Health. I also realize that passive smoking seriously harms people's health, which not only increases the incidence of adult chronic obstructive pulmonary disease, lung cancer, cardiovascular disease and asthma. & gt
Question 9: Can polyester spunbonded nonwovens be used as masks? I can't.
Spray cloth, melt blown cloth takes polypropylene as the main raw material, and the fiber diameter can reach 0.5- 10 micron. These ultra-fine fibers with unique capillary structure increase the number and surface area of fibers per unit area, so that melt-blown cloth has good filtering, shielding, heat insulation and oil absorption properties, and can be used in the fields of air, liquid filtering materials, isolation materials, absorption materials, mask materials, heat insulation materials and wiping cloths. Spunbonded nonwovens: After the polymer is extruded and stretched to form continuous filaments, the filaments are laid into a net, and the net is transformed into nonwovens through self-bonding, thermal bonding, chemical bonding or mechanical reinforcement. High strength, good high temperature resistance (can be used in the environment of 150℃ for a long time), aging resistance, ultraviolet resistance, high elongation, good stability and air permeability, corrosion resistance, sound insulation, moth prevention and non-toxicity.
The main products of spunbonded nonwovens are polypropylene polyester (long fiber and short fiber), and the most common and commonly used applications are non-woven bag packaging. And it is easy to identify because the rolling point of spunbonded nonwovens is rhombic.