The structure of sanitary napkins can be divided into surface layer, absorbent core, bottom layer and each layer of material with hot melt adhesive.
The surface layer is the part that is directly in contact with the skin, and its material must be soft. The surface weave and indentation determine the effect of menstrual blood absorption and non-reflow. PE perforated film surface layer and cotton surface layer are the two most commonly used materials. The PE surface layer plus the micro-porous design can make menstrual blood less easy to seep back and give users a dry feeling. However, the material is hard and some users will cause Allergic reactions; consumers with sensitive skin should choose carefully. Due to the improvement of cotton absorbent design, the market share after 2001 has gradually been higher than that of PE sanitary napkins.
The inner layer is mainly composed of high molecular polymer and high molecular water absorption factor formed by cotton, non-woven fabric, paper pulp or a composite of the above materials, which is used to absorb the outflowing menstrual blood. The side design is mainly used to prevent side leakage, because it will present an angle with the sanitary napkin body when used, and it is easier to rub against the groin area. Therefore, sanitary napkins with soft side materials are more favored by women.
The backing glue of the sanitary napkin is an impermeable material, which can keep menstrual blood in the sanitary napkin. In the 70s and 80s, a self-adhesive backing adhesive was developed to facilitate the fixation of the sanitary napkin on the underpants.
Sanitary napkins have very strict hygiene requirements, and the closer to the production date, the better the quality. Sanitary napkins are sterilized by using high-temperature disinfection methods. After all, the validity period of one-time disinfection and sterilization is limited. If the sanitary napkins are stored for too long, they will deteriorate and contaminate even if they are not opened. . Therefore, when using sanitary napkins, you must pay attention to the expiry date, do not buy too much at one time, and it is not suitable for the family to keep them for a long time.
