Masks can be divided into four categories: ordinary gauze masks, medical masks, daily protective masks and industrial dust masks according to their uses. The pneumonia epidemic in China in early 2022 led to a sharp rise in the demand for medical masks, which coincided with the decline in production capacity during the Spring Festival holiday and a shortage of masks, which led to measures such as mask purchase restrictions and appointment purchases. According to public information, the raw materials for the production of medical masks are mainly high-melt fiber polypropylene, and the supply of raw materials is sufficient.