Small mask, big knowledge! Chemical things about masks _ protection Private
1 year ago - Multimedia - San Diego - 159 views Certification standards The current industry standard for ordinary medical masks is Disposable Medical Masks YY/T0969-2013. surgical mask Picture selected from network Standard surgical masks generally consist of 3-4 layers,Full Body Disposable Coverall, the outer layer is waterproof, which can prevent droplets from entering the mask, the middle layer is used to filter, and the inner layer near the mouth and nose is used to absorb moisture to ensure that the wearer's lips are dry and comfortable. The filter element generally uses superfine fibers as a melt-blown nonwoven material, and the superfine fibers are randomly arranged to form a large number of tiny pores. The whole mask adopts folding design to improve the fit between the mask and the wearer's face, which can block more than 90% of 5 μm particles. Superfine fiber: There are different definitions. It is also called microfiber, fine denier fiber and very fine fiber. Generally, the fiber with a fineness of less than 0.3 denier (diameter of 5 microns) is called superfine fiber. It is mainly composed of polyester and polyemide. The technical process of the melt-blown non-woven fabric comprises the steps of polymer feeding, melt extrusion,KN95 Mask for Epidemic Prevention and Control, fiber formation, fiber cooling, web formation, and cloth reinforcement. Protective effect Surgical mask is a medical mask commonly used in operating rooms and other environments with the risk of body fluid and blood splashing, Blocking principle: Outer waterproof layer: It is usually needle-punched cotton, also known as polyester needle-punched felt. The polyester material itself is difficult to absorb water. After the polyester staple fiber is made into non-woven fabric by needling, water molecules and droplets with strong polarity are difficult to pass through, 3 Ply Disposable Protective Face Mask ,Full Body Disposable Coverall, while non-polar air can be inhaled smoothly. Middle filter layer: I would like to remind everyone to pay attention to protection, wear masks, wash hands frequently, ventilate frequently, do not eat together, go out less,KN95 Face Mask, do not spread rumors, do not panic, and overcome the epidemic as soon as possible! Return to Sohu to see more Responsible Editor:. zjyuan-group.com