Medical non-woven packaging materials are generally SMS non-woven fabrics. The main material of this non-woven fabric is polypropylene, which is processed through multiple processes through meltblown and spunbond processes, and the microstructure is fine plastic fibers. Shrinkage after being exposed to high temperature is a characteristic of plastic items. There is no plastic that is truly resistant to high temperature, and high temperature resistance is also a relative concept. Therefore, non-woven fabrics will also have corresponding shrinkage reactions on the microscopic level.After high temperature sterilization, the fine plastic fibers of the non-woven fabric will shrink to a certain extent, and the performance is that the non-woven fabric after sterilization is more brittle than before sterilization, and the flexibility is reduced.