Meltblown cloth has a shelf life, because the main component of meltblown cloth is polypropylene, referred to as PP, which will degrade naturally after a long time, and the shelf life is 6 months away from light.
Due to the influence of light, heat, oxygen and external force, the molecular structure of PP will change, and the products will turn yellow, brittle and even crack, resulting in poor toughness, dimensional stability, thermal and oxygen stability and processability of PP. it is difficult to meet the requirements of processing and use directly using waste PP products.
Compared with the traditional spunbonded nonwovens, meltblown nonwovens have larger specific surface area, smaller voids but larger voids, high strength, good handle, and can effectively prevent bacteria from penetrating, blood tight but breathable; It can prevent cross infection, reduce the shedding of dust and hair, and provide a good medical environment;
Melt blown nonwovens use polypropylene as raw material, which is easy to process and has excellent drug resistance, so it has higher porosity, more specific surface area, better filtration efficiency and excellent insulation performance.
Easy to wear and use, low price. Therefore, the filtration performance, shielding performance, thermal insulation performance and oil absorption performance of meltblown nonwovens used in mask production are better than those of nonwovens produced separately. Reduce the amount of labor of nursing staff, convenient storage, supply and replacement;