What is SMS, SMMS, SMMMS nonwoven fabric?

SMS is the abbreviation of "Spunbond + Meltblown + Spunbond Nonwovens", that is a combined nonwoven fabric which two layer spunbond have been combined with one layer meltblown nonwovens inside, conforming them into a layered products, called SMS nonwoven fabrice (spun-melt-spun), if combined with two layer meltblown nonwoven inside, it's called SMMS nonwoven fabric (spun-melt-melt-spun), in the same way, combined with three layer meltblown nonwoven inside, it's called SMMMS nonwoven fabric (spun-melt-melt-melt-spun).
      SMS, SMMS, SMMMS are strong and offer the intrinsic benefits of fine fibers such as fine filtration, low pressure drop as used in face masks or filters and physical benefits such as acoustic insulation as used in dishwashers. One of the largest users of SMS, SMMS or SMMMS materials is the hygenice or medical industry, such as disposable diaper, feminine care products, facemask, surgical drape, surgical pack, surgical gown, etc.
      SMS, SMMS, SMMMS nonwoven fabric can be treated by special process, including of repellency, anti-static, absorbent, flame retardancy, anti-bacterial, UV resistance, fragrance treatment, etc. The treated fabric will be functioned with various features.