The composition of the medical masks
Common medical masks are mainly composed of three layers of non-woven fabrics. The inner layer is ordinary non-woven fabric; the outer layer is water-repellent non-woven fabric, which is mainly used to isolate the liquid sprayed by the patient; the middle filter layer is polypropylene meltblown nonwoven fabric that has been treated with electret; The nose bridge is made of environmentally friendly all-plastic strips, does not contain any metal, and is equipped with breathable, comfortable and especially suitable for electronic factories and daily life use.Disposable masks are made of environmentally friendly all-plastic nose bridges. The design of the nose bridge clamp can be adjusted to the most comfortable face according to different face shapes. The inner ultrasonic spot welding is selected, and the ear straps are very firm and not easy to fall. After the final production, it shall be sterilized by ethylene oxide and allowed to stand for 7 days for volatile toxicity. After being sealed and packaged, it shall be shipped out in a box.The core material of medical masks is polypropylene meltblown nonwoven fabric after electret treatment. It is important to remember these two keywords, as this is the key to filtering new coronavirus aerosols. Attention should be paid to the purchase, you should choose a mask clearly marked "Medical Surgical Mask" on the outer packaging.
Manufacturing process of medical mask
The melt-blown method is used to make medical masks.Melt Blowing is a polymer extrusion nonwoven process. It is a filter material with ultra-fine filtration effect developed by the US Navy in 1954 to collect radioactive particles produced by nuclear tests,The principle of the process is to draw a thin stream of polymer melt extruded from the nozzle hole of the die with high-speed hot air, thereby forming ultra-fine fibers and condensing on the condensate screen or roller, and relying on self-adhesive to become a nonwoven.