1. Reason analysis
Physical factor
Fiber blockage: In the process of use, the particulate matter in the air will gradually block the fiber gap of the melt-blown cloth, increasing the resistance of air through, thereby reducing the filtration efficiency.
Fiber wear: With the extension of use time, melt-blown cloth may be subjected to external forces such as friction and bending, resulting in fiber wear and fracture, affecting the filtration effect.
Chemical factor
Adsorption saturation: melt-blown cloth has a certain adsorption performance, will absorb harmful substances in the air. When the adsorption reaches saturation state, its filtration efficiency will decrease.
Chemical corrosion: In some special environments, such as the presence of acidic, alkaline or other corrosive substances, the melt-blown cloth may be subjected to chemical corrosion, thereby reducing the filtration efficiency.
Second, the degree of influence
The degree of filtration efficiency reduction depends on a variety of factors, such as the use of the environment, use time, maintenance and so on. Generally speaking, under normal conditions of use, the filtration efficiency of the melt-blown cloth will remain relatively stable for a certain period of time, but with the extension of time, the filtration efficiency will gradually decrease.
For example, after a few hours of continuous use of melt-blown cloth in medical masks, the filtration efficiency may be reduced, but it can still meet certain protection requirements. In a highly polluted environment or after a long period of use, the reduction in filtration efficiency may be greater.
Third, response measures
In order to minimize the reduction of the filter efficiency of the melt-blown cloth, the following measures can be taken:
Correct use: Wear and use melt-blown cloth products correctly according to the product instructions to avoid excessive pulling, friction and other improper operations.
Regular replacement: According to the use and product recommendations, regular replacement of melt-blown cloth products to ensure that its filtration efficiency is always in good condition.
Proper storage: In the storage of melt-blown cloth products, should avoid high temperature, high humidity, direct sunlight and other adverse environment, so as not to affect its performance.
