Under normal circumstances, s and ss can be distinguished by softness. S non-woven fabrics are mostly used in the packaging field, and ss non-woven fabrics are mostly used in sanitary materials. Therefore, in the mechanical design, the s machine prefers to make the non-woven fabric stiffer, and the s machine prefers to make the non-woven fabric softer. But after a special process, s non-woven fabric feels softer than untreated ss cloth, which is suitable for sanitary materials; and ss can also be treated to become stiffer and suitable for packaging materials. Another distinguishing latitude is the uniformity of the cloth, which refers to the stability of the weight per square meter, but it is difficult to distinguish by the naked eye.

In essence, the difference between s and ss cloth lies in the number of nozzles of the machine. The number of letters in the name represents the number of nozzles, so s has one nozzle and ss has two nozzles. At present, many mask manufacturers are looking for s cloths, ss cloths and even sss cloths. In fact, there is no difference between these cloths. Therefore, it is recommended that more attention should be paid to the key factors of cloth hygiene standards, tensile strength, and softness.

Non-woven fabric single S: spunbonded non-woven fabric, which is equal to a single-layer fiber web hot rolled; and non-woven fabric double SS: spunbond non-woven, fabric superimposed spunbond non-woven fabric, equal to two layers of web hot rolled to make. PP non-woven fabric: The fiber used for non-woven fabric production is polypropylene, which is a synthetic fiber obtained by polymerization of propylene.