So if there is static electricity on the meltblown cloth, will it exist for a long time, or is it said that the charge will be lost after a period of time and the product will be unqualified?
Many melt blown cloth manufacturers report that the melt blown cloth that has just been produced reaches level 95 or even level 99 on the same day, and falls to 92, 90 or even 85 after a few days. What is the reason?
In fact, the filtration efficiency of meltblown cloth is a systematic project, which is related to the thickness and density of the spinneret, the polarity of the PP molecule, and the power (electric field strength) of the electrostatic generator.
Electret means charging. The electret melt blown cloth reaches the 95+ level at first, but the filter effect drops after a few days of exposure, mainly because the electrostatic field is extremely unstable and the charge attenuation causes the filter effect to attenuate.
At present, there are three commonly used electret masterbatches: tourmaline method production, gas silicon method production, and nitrogen-containing chemical fatty acids.
The three types of electret masterbatches have their own advantages and disadvantages. The electret masterbatches produced by the gas-silicon method have high efficiency and good durability. They are basically permanent electricity storage, easy to disperse, non-toxic and tasteless, and can pass FDA certification. It seems more advantageous.
This is because the electrostatic effect of these electret materials due to the electret greatly improves the electrostatic adsorption capacity of the material, and the particles will be strongly adsorbed when they pass near the electret fiber. The meltblown cloth made of high-quality electret masterbatch is still effective after one year of storage.
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