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The core material of children's mask-high efficiency and low resistance meltblown cloth

  • Author:GUIDE TEXTILE
  • Source:GUIDE TEXTILE
  • Release on:2021-02-08
The core filter material of the mask is meltblown non-woven fabric(Meltblown Fabric On Sales), which is located between the inner and outer layers of the mask body. Regardless of its location or the role it plays, melt blown cloth deserves to be called the "heart" of masks.

Mask filter materials(Melt Blown Filter Vendor) belong to the subdivision of air filter materials. Since SARS in 2003, masks equipped with filter materials with meltblown technology as the core quickly replaced the mainstream status of gauze masks due to their obvious protective effects.

The core technical principle of meltblown cloth is ultrafine fiber and electrostatic electret, and the filtering mechanism mainly relies on interception, gravity settlement, inertial collision, Brownian motion, and electrostatic adsorption. When the particles in the air pass through the filter layer, the three-dimensional network structure formed by the melt-blown fibers(Meltblown Nonwoven Fabric Company) will hinder the air flow, causing the air flow to change the speed and direction of travel countless times and bypass the fibers. The smaller the fiber diameter, the greater the probability of particle collision with the fiber due to mechanical reasons, so that more particles will stay on the surface of the fiber, thereby achieving a better filtering effect, that is, the higher the filtering efficiency. The average fiber diameter of melt blown fiber is 2~5 microns, and the new technology can make it reach 0.5~3 microns, which is commonly referred to as nano-micron level. Therefore, one of the characteristics of high-quality melt blown filter media is ultra-fine fiber , And the arrangement is randomly distributed, the specific surface area is large, the gap is small, and the porosity is high. However, the mechanical barrier has a poor filtering effect on particles with a particle size of less than 1um, and small particles are easy to enter the lungs and cause greater damage to the human body. Therefore, the filtration of small particles cannot be ignored. It is a good way to improve the filtration efficiency of the filter material by using electrostatic adsorption. At present, the most common method to achieve electrostatic adsorption is to use high-voltage corona charging to electret the meltblown cloth. Normally, there is no electret product, its filtration efficiency is only about 30%, then after we elect, the efficiency can reach more than 90%. At the same time, the durability and stability of the electric field generated by electret mainly depends on the level of electret technology. It is contradictory to take both high filtration efficiency and low resistance into consideration, because the fine fiber diameter and the good mechanical filtration effect also bring about the increase in resistance. Therefore, when the meltblown ultrafine fiber preparation technology is completed, the long-term electret preparation technology is The key to producing high-quality meltblown cloth is the high efficiency and low resistance meltblown technology.

Meltblown Fabric On Sales, Melt Blown Filter Vendor, Meltblown Nonwoven Fabric CompanyMeltblown Fabric On Sales, Melt Blown Filter Vendor, Meltblown Nonwoven Fabric Company

Based on the development of high-efficiency and low-resistance meltblown technology, the technological progress of masks has also become more significant. In NIOSH 42 CFR84 of the United States, N95 requires mask filtration efficiency ≥95.0%, inhalation resistance ≤350Pa, and expiration resistance ≤250Pa; while my country’s GB/T 32610 "Technical Specifications for Daily Protective Masks" issued in 2016, filtration efficiency ≥ At 95.0%, the inhalation resistance is required to be ≤175Pa and the expiration resistance is ≤145Pa; when the GB/T 38880 "Technical Specifications for Children's Masks" issued on May 6, 2020 requires a filtration efficiency of ≥95.0%, the resistance is adopted For testing at 45L/min, the inhalation resistance and expiration resistance are required to be ≤45Pa. It can be seen from the changes in standards that the level of technological progress in my country's mask and meltblown preparation technology is developing rapidly.

Children's metabolism is vigorous, and their metabolic level and oxygen demand are close to adults. Due to its physiological characteristics, children's lung capacity and tidal volume are smaller than adults. In order to meet the needs of metabolism, the body can only be satisfied by increasing the breathing rate, so the younger the age, the faster the breathing rate. Moreover, children’s internal respiratory resistance is inherently greater than that of adults. Therefore, under the premise of ensuring the protective effect, in order for children to enjoy relative comfort when wearing masks, reducing inhalation resistance is the most important requirement for children’s masks. It is the development of high-efficiency and low-resistance meltblown technology that makes masks that meet the children's national standard can ensure high efficiency, while the ventilation performance is significantly better than that of adult masks, making children feel more comfortable when they breathe.