Analysis of the effect of mask air permeability on its quality
In the past two years, due to the impact of the epidemic, the continuous development of science and technology, the continuous improvement of people's living standards, the increasingly serious environmental pollution, people's awareness of self-protection has been continuously strengthened, and masks are particularly common as protective equipment. The mask covers the mouth, nose and chin of the person so that the mask and the face closely fit, and the person inhales to force the air to filter out harmful substances when passing through the mask to achieve the protective effect. The air permeability of masks is one of the factors affecting their comfort and quality. The fabric air permeability tester is a testing equipment for measuring the air permeability of masks. (Hong Kong) Co., Ltd. is the manufacturer, please contact us. The fabric air permeability tester is used to test the air permeability of non-woven fabrics, meltblown fabrics, masks, special industrial fabrics, general fabrics, sponges, knitted fabrics, coated fabrics, non-woven fabrics and industrial filter paper. Applicable standards: GB/T 5453, ISO9237, AFNOR G07-111, ASTM 737, BS 5636, JIS L 1096-A, DIN 53887, etc. Main parameters: 1. Pressure range: 1～4000Pa; 2. Measurable air permeability: 1～40000mm/s; 3. Measurement error:≤±2%; 4. Measurable fabric thickness: customized according to the sample; 5. Suction volume adjustment: data feedback dynamic adjustment; 6. Sample area setting circle: sponge clamp; 7. Clamp size: 100mm*100mm. In addition, how much does the air permeability of the mask affect the quality? The non-woven fabrics are porous. Relevant studies have shown that the pore size is closely related to the air permeability of the fabric. Generally, the larger the average pore size of similar fabrics, the better the air permeability. There are obvious differences in the pore size and air permeability of different types of fabrics. The same type of fabric has different air permeability due to different fiber raw materials, yarn density, fabric structure, fabric warp and weft density and fabric thickness. Because the air permeability of double-sided knitted fabric is much lower than that of single-sided knitted fabric, the harmful substance barrier property of double-sided knitted fabric is very good. Because the non-woven fabric generally presents a single-fiber network structure, which has a greater air permeability function and a harmful substance permeation function, and the mesh non-woven fabric fiber has more contact surface area, so it has a stronger adsorption function. The air permeability of the fabric shows a clear and regular downward trend with the increase of the number of layers. Taking cotton fabrics as an example, the air permeability will decrease by about 50% from single layer to double layer; while the number of fabric layers is continuously added, the decrease tends to be steep; when the number of fabric layers is added to 6 layers, the air permeability is only single layer. 20% of the layer fabric. Therefore, the relationship between fabric pore size and number of layers and air permeability is particularly important in the design of protective masks. When the breathability of the mask is poor, the gas exhaled by the person cannot communicate with the outside world very well, resulting in the accumulation of exhaust gas in the mask, which makes it difficult for people to breathe and makes people feel uncomfortable; when the breathability of the mask is good, the gas exhaled can be extremely Good communication with the outside world, people will feel the breathing dredging.
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