Part II: Disinfection and sterilization scheme for masks.
Part III: Two basic functions of medical masks.
The fourth part: How to disinfect the mask without destroying its two basic functions?
The fifth part: How to prove the completion of the basic function through simple experiments?
The first part: the structure of medical mask.
Part II: Disinfection and sterilization scheme for masks.
? From Grandpa Zhong, it was confirmed that the city was sealed in Wuhan.
? There is no problem from a mask with a life span of only four hours to wearing it for two days.
? Since the first steam disinfection scheme, countless disinfection and sterilization schemes have emerged. ...
? There is only one purpose: let the mask be worn for a few more days, even dozens of days!
? There is only one reason: you can't buy a mask.
Analysis:
First, steaming method: add water to steam, boil water and steam for 5 minutes.
Principle: HD antivirus exceeds 100 degrees.
Problem: steam condensation releases a lot of heat, and non-woven fabrics can't be washed.
Second, the hair dryer disinfection method: the distance 15 cm is about the distance from the tip of the thumb to the tip of the little finger when the palm is open. If the distance is too close and the temperature is easy to rise, then the distance of 5 cm will rise to 80 degrees Celsius;
10cm is 70 degrees;
15cm is 65 degrees;
Principle: The doctor said that NCP virus will die if it exceeds 65 degrees.
Three, oven disinfection, ultraviolet disinfection, ozone disinfection, alcohol disinfection ...
There are many schemes for disinfection and sterilization, but none of them are the point!
The key point is:
Can the mask be used after disinfection and sterilization?
Is the mask fully functional after disinfection and sterilization?
Part III: Two basic functions of medical masks.
The antiviral principle of medical masks is as follows:
First, filterability.
Second, electrostatic adsorption (filtration plus)
The middle spray layer adopts high-efficiency electrostatic fiber, which can improve the efficiency of filtering respiratory dust, aerosol and fog drops without increasing respiratory resistance through electrostatic adsorption principle.
I found a lot of relevant information as follows.
Zhihu: Can alcohol spray be disinfected?
/cXTVpuJL
Address 2:/v _ show/v _ show/id _ xod2nzc4ntuy.html? SPM = a2hbt . 13 14 1534 . app . 5 ~ 5！ 2~5! 2~5~5~5! 2~5~5! 2~5! 2~5! 2~5~5! 2~A
? There are four kinds of filter materials tested: HV T70, 3M mask, HV T300 and cotton mask.
? This scheme is very simple. In an environment with a PM index of 265, the filter material was sealed to the filter tube, and the PM index after filtration was tested.
The fourth part: How to disinfect the mask without destroying its two basic functions?
If the virus is killed, but the filterability and electrostatic adsorption are gone, then this disinfection and sterilization method is invalid!
Such as steam method!
The laboratory scheme is as follows:
? In the experiment, E.coli simulated virus was sprayed on six N95 masks on the market, and five sterilization methods, such as dry heat (oven), wet heat (steamer), high temperature and high pressure sterilization, ultraviolet light and spraying alcohol, were tested to observe the feasibility of reuse.
? The filtering effect has the least influence, and the filtering effect is maintained at 95%!
? This is what we want!
? This effect is even medical grade, that is to say, in the case of hospital gap masks, this treatment can at least prolong the life of masks by 3-5 times.
The fifth part: How to prove the completion of the basic function through simple experiments?
Analysis of manufacturing process from petroleum to medical mask
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According to the requirements of the above-mentioned links, only the medical masks produced according to the above-mentioned process are made of high melt-blown non-woven fabrics, which are used to produce filter materials. After electret treatment, electrostatic adsorption is increased, and after production, they are disinfected with ethylene oxide. After standing for 7 days, the ethylene oxide is analyzed, which is qualified and safe, and can be used to isolate the spread of COVID-19.
Unde that condition that the existing mask is repeatedly disinfect and used,
Under the threat of some fakes, as an ordinary person, how to simply test whether the basic functions of a mask are completed? !
As shown in method 1
Video address: /tv/v/Iuaf2EY59? FID = 1034:447 189 173842743 1
? The screenshot is as follows:
finally
A set of data:
At present, the daily output of all masks in China is 65.438+02.32 million (the annual output of masks was 4.5 billion last year). As long as the supply of raw materials is restored and the enterprise resumes production, it is allowed to stand for 7 days after disinfection, plus 3 days of logistics and transportation, the supply of masks will continue after 654.38+00 days. If the shaft rotates for 24 hours, the production capacity will be doubled again, and it is estimated that 25 million pieces can be produced every day in the near future; If a new production line is added (it takes 60 days to complete the production), China can produce 313.5 billion masks a year.
? Therefore, the life of this article is extremely short, maybe a week, maybe two weeks, but it must not last four weeks.
? Because of the mask of 1 yuan at that time,
? Even 0.5 yuan can be bought at will!
If you solve your problem,
Please enjoy | reward.