Instant China
Written by: The Bund
2020-07-11 08:30
Last update date: 2020-07-11 08:30The dream of the person who sold the mask was broken, but the person who should be worried became the person who bought the mask. Careful people have estimated that the price of recent masks is plummeting in a "jumping style." Open Taobao, the price of disposable medical masks has dropped to a minimum of 1 Mao 2 and it is also free shipping. At present, my country has nearly 160,000 business scopes including mask-related enterprises. From January to May, 70,802 new mask companies were added, an increase of 1255.84% compared with the same period in 2019. The daily production capacity of medical protective masks in Changyuan City, "the capital of China's medical consumables", has increased from less than one million before the epidemic to more than 50 million. Now we don’t have gaps, we can buy them everywhere on Taobao and stores, but are they really safe?
Since July, many drug regulatory bureaus in Jiangxi, Hubei and other places have issued notices that more than 410,000 masks have been recalled because of failure. Zhou Liang, a practitioner who has been cultivating in the mask industry for 8 years, suggested that we should not hoard masks now. "The quality of masks in the entire market has declined compared to the pre-epidemic period. The filtering capacity may be "invalid" within a month or two, and it is safer to buy as you go."
[Related Photo Gallery] K Kwong teaches how to distinguish true and false masks (click to enlarge):
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The mask you bought may have "expired"
Zhou Liang entered the mask industry in 2013 and was the founder of Duoling masks. As an industry expert, he focused on researching high-end masks. An article published on Zhihu during the epidemic, "The recent chaos and future trends in the meltblown industry", was read 9.4w+ and was reprinted by major media. He mentioned in the article, "There will be a large number of mask filtration efficiency attenuation problems in the next year, and the quality of masks will be vigorously checked at home and abroad."
"It can be seen from the companies exposed in various places recently, whether it is a new brand or a traditional mask factory, there will be problems with unqualified mask products. The quality of masks in the entire market has declined compared with before the epidemic." This phenomenon has also been constantly surrounded by him. Verification by friends engaged in the mask industry.
A friend spent hundreds of thousands of disposable face masks produced in April and early May were no problem, but in the end of May faced random inspection by the Food and Drug Administration did not meet the standards. "Because of the random inspection, their masks can't be sold in the warehouse. Who would have thought that the masks will be "expired" after being placed in the warehouse for a month."
In general, the maximum shelf life of masks can be 5 years, why are these unqualified after only one month? Sounds incredible. But Zhou Liang believes that this may be related to the fiery filter material melt melted cloth some time ago.
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Why is it difficult to buy a qualified mask?
Perhaps few people will know about meltblown before 2020, but this year it has become a soft gold for many people. During the epidemic season, the price of N95 meltblown cloth once reached 850,000 yuan/ton. The huge profits of dozens of times and hundreds of times have attracted countless investors. However, some late-stage manufacturers lack professional knowledge and do not understand the mask protection principle and attenuation efficiency. "The overall quality of the current melt-blown industry market has fallen sharply compared with before the epidemic, and defective products and counterfeit products are the most."
As a key material for masks to filter, melt-blown cloth is also called the "heart" of masks. Different grades have different filtering effects. Meltblown cloth with 50% filtration efficiency is used as a civil protective mask, which can only prevent dust and dust, and cannot isolate viruses. For medical masks and surgical masks that can filter viruses, melt-blown cloth with a filtering efficiency of 95% must be used. For a general N95 mask to achieve 95% filtration efficiency, a critical step is required-electrostatic electret treatment. Simply put, it is to make the melt-blown cloth static electricity, making it an electret, that is, a permanently charged material, similar to a "battery". After being fully charged, the meltblown cloth absorbs fine dust, bacteria and virus droplets through the static charge on the surface. In this way, the filtration efficiency of the meltblown cloth can be increased to over 90%, protecting humans from infection.
In the same problem, if the electret process on the filter material is not perfect, the materials such as meltblown will be "charged" insufficient, decay quickly, and the filtration effect will be greatly discounted. Of course, the filtering effect of meltblown or filter materials cannot be equal to the filtering effect of masks, which is not familiar with the testing standards, testing equipment, and testing methods. However, in the face of small-scale mask enterprises that have been converted to large-scale production this year, considering the stability of the meltblown fabric manufacturing machinery during the epidemic and the delivery time of the machine, Zhou Liang believes that the quality of the mask is difficult to guarantee.
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Small masks are not completely without technical barriers. For example, melt-blown cloth production and electret treatment are production technologies. It is also costly to establish a melt-blown cloth industrial line. In March this year, Markus Müller, the sales director of melt blown machinery supplier German Reicol, said in an interview with the National Public Radio (NPR): In order to ensure that the fibers are thin enough and the quality is stable, the melt blown machine needs very high precision. The production and assembly time of a machine takes at least 5-6 months, and the price of each machine can reach 4 million US dollars.
In addition, the melt-blown cloth that has not gone through a good packaging and storage environment will also increase with time, and the static electricity will gradually decay, affecting the filtration efficiency and the protection effect. Therefore, it is also recommended that you buy a mask and protect it from light and seal it. At the same time, do not hoard the mask, otherwise the mask you buy may "expire" after a while.
"Don't stock your masks when you buy them"
Next, how should everyone choose a mask? Zhou Liang also gave some suggestions so that we can screen from the product information to avoid encountering "pits" (click to enlarge):
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Although the determination of whether a mask is qualified or not requires an inspection agency, as an ordinary person, you can still learn more about the basic knowledge of masks and learn to judge masks.
Judging from the current domestic stocks, reducing stocks in the second half of the year and buying and using them can also make us more at ease.
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[Related Photo Gallery] New Crown Pneumonia｜US 26-year-old male supermarket licks a whole row of goods involved in "terrorist attack" (click to enlarge) ↓↓↓
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