Experimental Study On Filtration Performance Of Protective Facial Mask

For the last ten years, the number of the occupational disease in China is consistantly ranked first in the world. Of these occupational diseases a large proportion is pneumoconiosis. Masks can be effective in against pneumoconiosis. Masks many types of masks are out in the market today, but their quality can’t be guaranteed. In order to access the the type of protection these masks offer, factors such as permeability, material, filtration efficiency, air leak, and humidity are studied.Based on the existing information, the depth of the mask, facial features, and factors affecting properties are also studied. From these factors, a mask performance metric is recommended, and an experiment device is established. Specifically, the penetration rate and resistance of the different material, different mask structure, different layers of the mask in the different flow are considered for the recommendations. The count and weight method is used when counting particles in order to determine the filtration efficiency of different particles sizes. The high humidity problems caused by breathing are also simulated and the impact on mask resistance, air leak around the edge of the face masks. Different facial shapes are also studied in regards to air leakage of the masks.The experimental data shows that, materials with finer fibers, larger surface area, a more homogeneous fiber distribution, are better at filtering out pollutants. The following conditions can make penetration rate lower, increase in mask material layers, Nano fabric coating, charged filter materials, these conditions can also increase filter efficiency. An increase in the size of the facial structure corresponds with decrease in the leakage rate. An increase in humidity causes a higher resistance.