Sanitary napkins mainly consist of three layers: the surface layer, the absorbent core, and the bottom layer. The layers are bonded together with hot melt adhesive. The outermost layer (the bottom layer) is non-woven fabric, which is soft. Inward is a leak-proof membrane (made of waterproof paper or polyethylene film). Further inward is fluff pulp mixed with high molecular absorbent wrapped in toilet paper, forming a strong absorbent. Once menstrual blood penetrates this layer, it will be firmly attached and will not reverse or scatter. There is also a pressure-sensitive tape (self-adhesive) on the back of the sanitary napkin, which is set off with the release paper. When using it, just tear off the release paper and throw it away, and then stick the tape on your underwear to prevent slipping.
