Non woven fabrics for masks are usually composed of 2 layers of spunbond non-woven fabrics and 1 layer of meltblown non-woven fabric. Different shielding layers have different functions. The inner and outer layers of spunbond non-woven fabrics have anti-foam and dust-proof functions, and the middle layer of meltblown non-woven fabrics has a filtering function.
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