SMS ＂sandwich＂ structure for medical masks
Medical masks are generally composed of non-woven fabrics, melt-blown fabrics, nose bridges, ear straps, etc. The main structure is a three-layer non-woven fabric, also known as an SMS "sandwich" structure. The differences and functions between them are as follows: inner S layer: Ordinary spunbond non-woven fabric, mainly hygroscopic function; outer layer: carefully waterproof non-woven fabric, mainly used to replace the liquid sprayed by patients to prevent anti-spray effect; middle M layer: treated by electret Melt-blown non-woven fabric, which can filter bacteria suspended particles, is the most important core layer. The functions of the three layers of materials can be superimposed as: outer layer anti-spray, middle layer filtration, inner layer moisture absorption.
Therefore, the melt-blown cloth is the "heart" of the medical mask. It is used for the filter layer in the middle of the medical mask, and has good filterability, barrier property, thermal insulation and adsorption. The main raw material of non-woven fabric is homopolypropylene (PP, melt flow rate MFR=2-3, also known as melt finger, which characterizes the melt flow performance) to produce polypropylene fiber material by modification with peroxide, of which S The MFR of the PP fiber material for the layer is about 25-40, and the MFR of the PP fiber material for the M layer is about 400-2000 (also known as melt blown material). PP fiber material is produced through a non-woven process to obtain the non-woven fabric required for the production of masks, in which the melt-blown non-woven fabric is subjected to an electret treatment (to charge the fiber and capture the aerosol with electrostatic gravity), high-end For the M-layer non-woven fabric, PTFE (polytetrafluoroethylene) can also be used as a raw material. The earwear is mainly composed of polypropylene plastic/polypropylene fiber+spandex. In addition, other small amounts of traditional raw materials include polyester (PET), polyester staple fiber, polyamide (PA), polyethylene (PE) and polyurethane (PU).
Although masks are not high-tech products, they also have a sophisticated industrial chain. Several components that seem ordinary actually involve basic industrial categories such as petrochemicals, chemicals, textiles, machinery, metallurgy, and electronics. If the relevant production equipment is added, it will also involve the fields of material processing, mechanical manufacturing, electrical control, pneumatic components, ultrasonic pressure welding, automatic packaging, sterilization and disinfection.
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