The structure and hygiene requirements of sanitary napkins
The structure of sanitary napkins can be divided into surface layer, absorbent core, bottom layer and hot melt adhesive between each layer of materials. The surface layer is the part that directly contacts the skin. The material must be soft. The surface weave and indentation determine The absorption of menstrual blood does not seep back. PE perforated film surface layer and cotton surface layer are the two most commonly used materials. The PE surface layer plus the microporous 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 menstrual blood flowing out. The side design is mainly used to prevent side leakage, because it will present a certain angle with the sanitary napkin body when in use, and it is easier to rub against the groin area. Therefore, sanitary napkins with soft material sides are more favored by women. The adhesive backing of the sanitary napkin is an impermeable material, which can retain menstrual blood in the sanitary napkin. In the 70s and 80s, a self-adhesive adhesive backing was developed to facilitate fixing 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 high-temperature sterilization. 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. Previous post: The core layer revolution of baby diapers Next post: Evolution of baby diapers from one to three generations
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