What does S, SS, SMS, SMMS in non-woven fabric mean

In non-woven fabrics, S, SS, SMS, SMMS mean the following S: Spunbond non-woven fabric u003d single-layer fiber web hot rolled; 　　 SS: Spunbond non-woven fabric + spunbond non-woven fabric u003d two-layer web thermal Rolled; 　　SMS: spunbond nonwoven fabric + meltblown nonwoven fabric + spunbond nonwoven fabric u003d three-layer fiber web hot rolled; 　　SMMS: spunbonded nonwoven fabric + meltblown nonwoven fabric + meltblown nonwoven Woven fabric + spunbond non-woven fabric u003d four-layer fiber web hot rolled. The main uses of SMMS non-woven fabrics: (1) Medical and sanitary cloth: surgical gowns, protective clothing, disinfection wraps, masks, diapers, women’s sanitary napkins, etc.; (2) Home decoration cloth: wall coverings, table cloths, Sheets, bedspreads, etc.; (3) Follow-up cloth: lining, adhesive lining, flakes, shaped cotton, various synthetic leather base cloths, etc.; (4) Industrial cloth: filter materials, insulating materials, cement packaging bags, geotechnical Cloth, covering cloth, etc.; (5) Agricultural cloth: crop protection cloth, seedling cloth, irrigation cloth, thermal insulation curtain, etc.; (6) Environmental protection material: sanitation products such as filter non-woven fabric, oil-absorbing cloth, etc. (7) Separator Thermal cloth: heat-insulating raw materials and clothing accessories (8) anti-feathering non-woven fabric (9) other: space cotton, thermal insulation materials, etc.