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The structure of the sanitary napkin can be divided into a top layer, an absorbent core, and a bottom layer. The layers of material are bonded together by hot melt adhesive.
The surface layer is a part that directly contacts the skin, and the material is soft, and the weave and indentation of the surface can affect the reverse osmosis effect (dryness) of the sanitary napkin. PE perforated film surface and cotton surface layer are the two most commonly used materials. The PE surface layer and microporous design can make the menstrual blood not easy to rewet, so that the user has a dry feeling, but the material is hard, some users will cause Allergic reactions; due to improved cotton absorption design and the availability of perforated and composite materials, the market share after 2001 is gradually higher than that of PE. The inner layer is mainly a high molecular polymer and high molecular polymer composite paper formed by cotton, non-woven fabric, pulp or the above composite material for absorbing the menstrual blood flowing out. The side design is mainly used to prevent side leakage, because it will be at an angle with the body of the tampon when it is used, and it is more likely to be rubbed with the squirrel. Therefore, the sanitary quilt on the side of the soft material is favored by women. The backing of sanitary cotton is impervious material, which can retain the menstrual blood in the sanitary napkin. In the 70s and 80s, the self-adhesive adhesive was developed to fix the sanitary napkin on the underwear.