Medical masks are generally multi-layer structures, generally referred to as SMS structures. At present, the highest number of layers in China is 5 layers, namely SMMMS.
The S in this represents thespunbondlayer (Spunbond), the fiber diameter is relatively thick, about 20 microns (μm), the two layers of Spunbond layer is mainly used to support the entire nonwoven fabric structure, does not have much effect on the barrier . The most important thing in the mask is the barrier layer or themelt-blownlayer M (Meltblown). The fiber diameter of the melt-blown layer is relatively thin, about 2 microns (μm), so it is only one tenth of the diameter of the spunbond layer. This prevents Bacteria and blood penetration play a vital role.
General medical masks usually use a 20 gram meltblown cloth, and N95 cup-shaped masks use a 40 gram or higher meltblown cloth.
According to the statistics of the China Industrial Textile Industry Association, as of the end of 2018, there were 1,477 domestic spunbond production lines, an increase of 65 from the previous year, an increase of 4.6% year-on-year, of which PP spunbond nonwoven production line increased by 3.38%,SMS composite production line An increase of nearly 13%,PET spunbond nonwovenproduction line increased by 9.32%; companies with an annual output of more than 50,000 tons also increased from 2017. Spunbond companies are accelerating their development towards scale, intensiveness, and high-end, and accelerating the market demand for product upgrades and technology upgrades.
Since 2018, many domestic companies have developed products that are lighter, thinner, and higher performance and have achieved good results. The high-speed operation of SSMMS spunbond / meltblown compositeprocess of more than 600 meters / minute is good; products of about 10 grams / square meter of ultra-soft, light and stable quality continue to emerge.
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