Sanitary napkins are divided into three layers in terms of product structure: the first layer is the surface layer, the main material is non-woven fabric or perforated film, which plays the role of penetration and isolation; the second layer is the absorption layer, which is made of fluff pulp or non-woven fabrics. Dust paper is used to complete the absorption. In order to make the product have better absorption capacity, some products are added with polymer water-absorbent resin; the third layer is the bottom layer, the main material is polyethylene film, which can prevent leakage, and the back is coated with thermal Melt glue, play a fixed role.