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The domestic status quo of meltblown cloth

  • Release on:2021-02-01
The raw material for domestic production of melt blown cloth(Meltblown Nonwoven Fabric Factory) in China is polypropylene. Polypropylene is a polymer formed by addition polymerization of propylene. It is a product of petrochemical industry. It is a white waxy material with a transparent and light appearance. The density is 0.89~0.91g/cm3, which is less than the density of water, and it is flammable. It has a melting point of 165℃ and softens at around 155℃. The use temperature range is -30~140℃. It is resistant to corrosion by acids, alkalis, salt solutions and a variety of organic solvents below 80°C, and can decompose under high temperature and oxidation. Polypropylene is widely used in clothing, blankets and other fiber products, medical equipment, food, and pharmaceutical packaging. In short, polypropylene is widely used. Melt-blown cloth is a fiber product. Due to the different production processes, it is called melt-blown cloth. The production process is to use a melt-blown machine to spray polyethylene fibers to produce a fiber material that is composited with a material similar to cloth. It is characterized by static electricity and can absorb particles, bacteria and other substances passing through the melt blown cloth. The characteristics of its adsorption are determined by its electrostatic capacity and thickness.

However, there is a contradiction here, that is, the thicker the meltblown cloth(FFP2 Meltblown Factory), the stronger the ability of electrostatic adsorption of substances, and at the same time, it will increase the air tightness and the air resistance rate. It does not matter if this data is not applied to biology, but once it is used On the raw materials of the mask, the whole process must be balanced. According to the regulations of GB2626-2006, under its designated testing environment and testing conditions, the total inhalation resistance should not be greater than 350 Pa, and the total expiratory resistance rate should not be greater than 250 Pa. This requirement for meltblown cloth immediately mentioned a cutting-edge technology level belonging to material science.

Meltblown Nonwoven Fabric Factory, N95 Material Company, FFP2 Meltblown FactoryMeltblown Nonwoven Fabric Factory, N95 Material Company, FFP2 Meltblown Factory

First of all, the material sprayed by the meltblown cloth has good filterability, so it could be achieved by increasing the thickness of the meltblown cloth. However, due to the limitation of resistance, the meltblown cloth is too thick and the breathing resistance must be taken into account. An unsolvable problem. The way to solve this problem is to reduce the weight of the meltblown cloth and use the thickness reduction to meet the requirements of breathing resistance. Going in this direction, the current market demand is for raw materials whose main weight is 25 grams.

Secondly, under the premise of considering the respiratory resistance, the heavier the weight, the higher the difficulty, but at the same time, the data is effective and beneficial for the filtration rate. Because as the weight increases, the filter channel will become thicker and longer (the filter channel I am talking about here is the thickness of the filter material, that is, the time it takes for bacterial particles to pass through the filter material), and the thicker and longer channel will increase its filtration Efficiency, so in this direction should pay attention to the problem of respiratory resistance, in the case of the same respiratory resistance, the material that can achieve the greatest weight is the best material. On the contrary, when the filterability remains stable, the lower the weight of the meltblown cloth, the higher the technical content.

Third, how is the electrostatic adsorption capacity of meltblown cloth(N95 Material Company) produced? The generation of static electricity is ordinary triboelectricity. So what are the technical requirements for triboelectricity?

1) The better the effect of frictional electricity generation, the greater the contact area. The larger the contact area, the greater the electrical energy it generates. (This principle is the most critical point in the production of melt blown cloth)

2) Frictional electricity generation requires a strong energy input to activate the electronic activity of the material itself, that is, when the total energy remains unchanged, the greater the energy input, the greater the frictional electricity generated. (This is the energy input requirement for melt blown cloth equipment, that is, under certain conditions, increasing energy input can solve the problem of frictional electricity generation)

3) How to maintain the electricity generated by friction? Under normal circumstances, the maintenance of electrical energy, such as batteries, capacitors and other principles to maintain the maintenance of electrical energy. From this perspective, maintaining the gap between the fibers is beneficial to increase the capacitance and increase the maintenance of electricity. Of course, the requirements of the production environment, storage environment, humidity, temperature and other aspects also require certain cooperation to maintain a longer time. Electric energy storage.

4) In addition, some of us use the term of electrode masterbatch to increase the capacitance and the retention time of the capacitance. The principle is similar. From this, it can be concluded that increasing the amount of electricity and capacitance is to increase the gap between the fibers or make the fibers form voids. The cavity produces the effect of a capacitor to conserve electrical energy.