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December 05,2022

Dehumidifier for melt blown cloth storage, static electricity does not decay to ensure filtering efficiency

Dehumidifier for melt blown fabric storage, static electricity does not decay to ensure filtering efficiency News It is believed that after this epidemic, everyone knows the importance of masks and melt blown fabrics; Whether the mask is good or not depends on the quality of the melt blown cloth. What is the melt blown cloth? What is its purpose? Melt blown cloth is the "heart" of masks, the core manufacturing material; The reason why the mask has a good protective effect is mainly due to the mechanical barrier and electrostatic adsorption of the melt blown cloth in the mask. Then, how is meltblown cloth produced

It is understood that the production process of melt blown fabric can be roughly divided into: polymer preparation → melt extrusion → metering pump → melt blown die head assembly → melt trickle drawing → cooling spray device → electrostatic electret device → receiving device. Generally, electrostatic electret treatment is required in the production process of melt blown nonwoven fabric to make the melt blown nonwoven fabric carry more static electricity and have electrostatic adsorption effect. Electrostatic adsorption refers to the capture of dust bacteria and viruses through the coulomb force of the charged fiber when the fiber of the filter material is charged

The filtration performance of the melt blown non-woven fabric just sprayed by the melt blown cloth machine is only less than 50%. It is not enough to rely solely on the mechanical blocking effect of the three-dimensional fiber aggregates with fine fibers, small voids and high porosity of the melt blown ultra-fine fibers. Otherwise, simply increasing the weight and thickness of the material will greatly increase the filter resistance. Therefore, the melt blown filter materials generally add electrostatic charge effect to the melt blown cloth through the electrostatic electret process, and the filtering efficiency can be improved by using electrostatic method, which can reach 99.9% to 99.99%. That is KN95 standard

However, there are many customers of meltblown fabric manufacturers who say that they have also installed electrostatic standing devices in the meltblown fabric production line for electrostatic standing treatment, and the filtering efficiency tested that day can reach 95%+. After one night, the electrostatic ions have decreased a lot, and the filtering efficiency has become 80% -. What is the reason? There are many reasons, such as the humidity of the melt blown fabric storage environment, which is one of the main factors; Melt blown non-woven electret is very sensitive to environmental humidity. A customer has conducted an experiment. After being stored for 7 days under normal temperature and high humidity (relative humidity greater than 95% RH), the surface potential of positive and negative corona charged samples has decreased to 28% and 36% of the initial value respectively

At this time, because of its open structure, large specific surface area and larger contact surface with the surrounding environment, the melt blown non-woven fabric is more sensitive to water vapor, corrosive gases, heterocharged particles, etc. in the environment. At the same time, the corona charging system can only generate ion charges with low beam energy, and most of the charges injected during the charging process are deposited on the near surface layer of the fabric surface fiber. When the sample is stored or operated in a high humidity environment, a large amount of charges are lost due to the compensation effect of polar groups in water molecules, atmospheric ions, etc. on the high concentration of surface charges on the fiber. If the static ion of melt blown non-woven fabric is gone, it will become an ordinary non-woven fabric

Therefore, high humidity environment must be avoided during the transportation and storage of meltblown fabric. So, how to avoid high humidity environment? There is no doubt that the most simple and effective way is to use a dehumidifier to scientifically and reasonably control the storage environment of the meltblown cloth, which can effectively ensure that the static electricity of the meltblown cloth does not disappear and the filtering efficiency_ The melt blown cloth storage dehumidifier and ZD series full-automatic humidity control dehumidifier are highly efficient, energy-saving and environment-friendly dehumidifier products manufactured by strict use of professional technology and exquisite technology. They are equipped with an intelligent humidity constant control system. Users can automatically control the operation and shutdown of the dehumidifier according to production needs, achieve efficient dehumidification effect through automatic control, and reduce the operating cost of the whole machine. Welcome to inquire the details of the dehumidifier for the storage of meltblown cloth to ensure the static electricity and filtering efficiency of meltblown cloth

  _ Technical parameters and model selection reference of melt blown cloth storage dehumidifier and ZD series full-automatic humidity control dehumidifier:

Product model ---- dehumidification capacity ---- applicable area ---- power ---- power ---- circulating air volume ---- net weight

_-- 28(L/D)---30-50 (㎡)---420(W)----220V/50Hz---190m ³/ h---15kg

  _-- 58(L/D)---50-80 (㎡)---670(W)----220V/50Hz---850m ³/ h---25kg

  _--- 90(L/D)---90-120(㎡)---1700(W)--220V/50Hz---1125m ³/ h--50kg

  _-- 138(L/D)--130-180(㎡)--2000(W)--220V/50Hz--1725m ³/ h--55kg

  _-- 168(L/D)--180-230(㎡)--2800(W)--380V/50Hz--2100m ³/ h--120kg

  _-- 240(L/D)--240-350(㎡)--4900(W)--380V/50Hz--3000m ³/ h--160kg

  _-- 360(L/D)--360-450(㎡)--7000(W)--380V/50Hz--4500m ³/ h--200kg

  _-- 480(L/D)--500-700(㎡)--9900(W)--380V/50Hz--6000m ³/ H-230kg

◎ Precautions for model selection -- The dehumidification capacity and model of dehumidifier are scientifically calculated mainly according to the volume of the used environment space, the size of fresh air volume, the humidity requirements required by the space environment and other specific values. In addition, it should be noted that the relative humidity of the environment is related to the temperature of the environment. The higher the temperature is, the faster the humidity will evaporate. On the contrary, the worse the effect will be. Therefore, when configuring the dehumidifier, you need to select the type under the guidance of professionals, so that you can select the dehumidifier that is most suitable for you

Core tip: To improve the filtering efficiency of masks, the key is to store the static electricity of melt blown non-woven fabrics. At the current flow rate of masks, the attenuation of static electricity is insufficient (for example, half a month after leaving the factory). Normal medical masks are valid for six months, while some masks in Japan are valid for three years. However, the validity period here is at room temperature and humidity, and the melt blown electret has good charge storage stability; However, when the melt blown electret cloth is stored in a high humidity environment, due to the compensation effect of polar groups in water molecules and foreign particles in the atmosphere on the charge on the fiber, a large amount of charge loss is caused. The charge decreases with the increase of humidity, and it becomes faster and faster

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