Recently, a large number of small factories and mask factories have put on-line melt-blown non-woven fabric equipment. The improvement over last month lies in the fact that they know the post-parking process and the need to add static electricity, but the problem still exists and they do not know how to add it.0.3%Still4%High voltage10KVStill20KVThe choice of raw materials from different suppliers will have a great impact.
Looking at the filter effect is improving step by step, it is gratifying that the Chinese are still smart and will always spare some time. But choice is more important than effort. This sentence can be used to describe the companies that have recently launched meltblown equipment. They may not know why their materials will never reach99.97%Why is there so much difference between the data measured by oneself and the data submitted by the third party for inspection, and why is it blacklisted when it is passed at home and abroad. (At present, some third-party testing agencies in China issue unreliable reports. In order to make money, they are not strictly controlled. If something goes wrong, they will only say that we are only responsible for sending samples.)
All kinds of testing equipment, all kinds of messy test data, less than 80% filter effect is civil meltblown is bullshit, what medical meltblown, industrial meltblown, civil meltblown are coming, this low-grade defective material can only be usedGB15979-2002The flat mask of the Hygienic Standard for Disposable Sanitary Products, which has no filter efficiency requirements.
The detection equipment of the above detection data has relatively low detection accuracy, and the detection methods have great problems. The particle counting method is suitable for low concentration, but it is not low dust emission. The lower the number of dust particles, the more distorted the filtration efficiency. Some domestic testing equipment may even deliberately improve the filter efficiency data, so you will find that your testing data is so excellent, and then get the same material.TSI8130The above test, why are there so many differences?TSI8130It is a photometric test method, and the dust of salt particles alone is as high17mg/m³The amount of oily particulate dust can be as high135mg/m³The detection accuracy is higher.
The above picture is2018At the beginning of the year, the test comparison of the same filter material of the same section and block,99.4%and93.1%It turned out to be the same point of the same piece of material (the particle counting equipment has little effect on repeated measurement due to low dust concentration, and the photometric method has high concentration and cannot be operated). You will find that the data displayed on two different brands of filter effect detection equipment have passed through and8130The data from the calibrated testing equipment will be more true than other testing equipment, although they are all made in China.
No electrostatic, pure physical filtration of meltblown materials, the filtration efficiency of oil and salt is similar (oily particlesCMDFor0.185um, saltCMDFor0.075umSome say their products can be filtered0.1umof particulate matter, filtered0.075umThe particles, please make it clear first, count the particle sizeCMD, aerodynamic mass median diameterMMAD, the relationship between the median diameter of the mass).
Recently, many masks exported to foreign countries have encountered the problem of low and unqualified filter efficiency tests. Of course, the filtration efficiency of meltblown or filter materials cannot be equal to that of masks, which is related to unfamiliarity with testing standards, testing equipment, testing methods, and the responsibility of experimenters.
In general, the meltblown cloth materials of traditional large factories will do a good job of technology, such as putting95GRADE MATERIAL (INITIAL32LPM,H11，8130) to achieve more than 97.5 percent. Now the new small factory home-made testing equipment out95%Filtration efficiency is happy, aging and attenuation tests are not done, you ask how much porosity of meltblown materials, attenuation efficiency, validity, etc., he is a face of meng force, in short, the current meltblown industry market mixed, the overall quality than before the outbreak of a significant decline, it is easy to encounter defective products, fakes.
Many people in the country believe that the mask testing equipment came out.95%The filtering effect isKN95Masks, this is ignorance of the standard, the initial filter effect is not equal to the loading filter effect, and some domestic testing institutions, their own detection level is low, no.8130Equipment, through intermediaries and other non-compliant means to handle qualified reports (this phenomenon is especially common during the outbreak), there are a series of problems such as the quality of samples and large goods, the quality of masks during the outbreak is generally much lower than before the outbreak, there is no way, now do mask business a lot of laymen.
GB2626-2006KN95The loading testEN149FFP2The test is different, that isFFP2The technical indicators of meltblown materials need to be betterKN95/N95Materials, but also not as horrible as the legendary difference (N95Current market85,P2Current market120-200), the follow-up can be completely solved through the distribution scheme, becauseEN149MediumFFP2Oil test conditions actually compared2626inKP95The test conditions are low. Ordinary post-polar melt-blown process is difficult to do, mainly reflected in the finished mask, high suction resistance and oil loading test rate is too low, with the abandoned mask clogging dolomite for selective test items).
The equipment of new melt-blown small workshops and small factories is simple and rough, and most of them have not been exposed to melt-blown production, so it is difficult to make high-grade filter materials at this stage, and it is necessary to ensure the stability of materials after pretreatment, aging attenuation of materials and other issues.5Month is the month when the meltblown production line starts the most. Manufacturers with stable quality can seize the tail to make continuous profits. Those who cannot produce good products can only be eliminated. At present, there is no shortage of meltblown cloth in the market, and the price of high-quality meltblown cloth continues to hang high.
The picture above is3Imported meltblown materials from different countries, conventional storage1Years later, this month.8130Test data, filtration efficiency is relatively stable, representing the high-end quality of the meltblown industry in the past.
The old-brand meltblown factory has launched the mask production line, and the high-quality meltblown cloth materials supplied to the market are becoming less and less, forcing the traditional mask factory to launch the meltblown cloth production line. It is said that a big-brand mask factory has spent700Wanou customized meltblown production line from Germany. The whole people have shifted from frying masks to making meltblown. How long can this drumming and fancy hype last? Apart from meltblown, who is the next mask hype outlet?
Remember,BFEIs the lowest filtration grade material, can be made of soil equipment meltblown material,2Layer25gramsBFE99Theoretical data is not enough.KN95/N95Load.
As the price of high-quality meltblown continues to rise, many mask factories have turned their attention to the relatively cost-effectivePTFEMembrane, by increasing resistance, to solve the problem of unqualified filtration efficiency, resulting inPTFEThe price of film also continued to rise.
Although this membrane resistance is large, it is controllable.KN95/N95The required resistance range, did not expect a few years ago by the mask industry eliminated things, because of the epidemic and sell resurrection, can do a good job of the enterprise is not much, mainly reflected in the use of substrates (spunbond, spunlace, hot air) composite.PTFEThe compound link in, as well as the production link of making masks, is prone to hole problems affecting the filtration efficiency, of course this2Whether the link is well controlled or not, that is, the probability is a question of how much, compared with the general increase of 20 times of meltblown, the market still has demand.
Summary
In the next year, there will be a large number of mask filtering efficiency attenuation problems. Domestic and foreign countries will vigorously check the quality of masks. From the recent exposure of enterprises in various places, it can be seen that no matter whether it is a new brand or a traditional mask factory, there will be the problem of unqualified mask products. The quality of masks in the whole market will be lower than before the epidemic. In the future, the price war will start in the second half of the market, good products have a way out.
Author: ZHOU Liang
