The structure and hygienic requirements of sanitary napkins
The structure of the sanitary napkin can be divided into the surface layer, the absorbent core, the bottom layer and the materials of each layer are bonded with hot melt adhesive
The surface layer is the part that is in direct contact with the skin, and its material must be soft. The weaving method and indentation on the surface determine the effect of menstrual blood absorption without rewetting. The surface layer of PE perforated film and the surface layer of cotton are the two most commonly used materials. The PE surface layer and the microporous design can prevent menstrual blood from seeping back and make users feel dry. However, the material is relatively hard, and some users will cause Allergic reactions; consumers with sensitive skin are advised to choose carefully. Due to the improvement of cotton absorption design, the market share after 2001 is gradually higher than that of sanitary napkins with PE surface.
The inner layer is mainly composed of cotton, non-woven fabrics, pulp or polymers formed by composites of the above materials and polymer water-absorbing factors, which are used to absorb the outflowing menstrual blood. The side design is mainly used to prevent side leakage, because it will be at an angle with the tampon body during use, and it is easier to rub against the groin, so tampons with soft materials are more popular among women.
The back glue of the sanitary napkin is an impermeable material, which can keep the menstrual blood in the sanitary napkin. In the 1970s and 1980s, a self-adhesive back glue was developed, which is convenient for fixing the sanitary napkin on the underwear.
The hygienic requirements for sanitary napkins are very strict, and the closer the production date is, the more guaranteed the quality will be. Sanitary napkins are sterilized by high-temperature sterilization. After all, the validity period of one-time disinfection is limited. If the period is exceeded, there will be no guarantee of sterility. If sanitary napkins are stored for a long time, they will deteriorate and contaminate even if they are not opened. . Therefore, when using sanitary napkins, you must pay attention to the expiration date, do not buy too much at one time, and it is not suitable for family storage for a long time.