The ordinary diapers currently on the market are mainly composed of four layers. The order from the top layer to the bottom layer is: surface layer, flow guide layer, absorbent core layer and back layer. The materials used for the surface layer are usually bicomponent fiber hot-air non-woven fabrics, polypropylene hot-rolled fabrics and spunbond non-woven fabrics. They are required to be soft and non-irritating to the skin, and also allow urine to penetrate quickly to keep the skin surface dry; At present, hot-air or hot-rolled nonwoven materials are most commonly used. Hot-air nonwoven materials have a good spatial structure. The liquid passes through many holes in a zigzag manner, which are through holes; while the fiber distribution in hot-rolled nonwoven materials is more regular, and after being heated After rolling, the fibers around the rolling point are consolidated with each other, and the thickness of the nonwoven material becomes thinner, mainly closed pores and semi-closed pores, which prolongs the penetration time. The diversion layer mainly uses hot air nonwoven materials of thermoplastic fibers or bicomponent fibers to quickly transfer urine to the entire surface of the absorbent core layer; compared with the hot air nonwoven materials of the surface layer, the hot air nonwoven materials of the diversion layer Tough and stiff, the fibers are mainly arranged longitudinally, and the gaps between fibers are large. At the same time, the fluffy structure with a certain thickness is conducive to quickly capturing local liquid, temporarily storing it and then spreading until it is absorbed by the core layer. The absorbent core layer is composed of toilet paper or non-woven material wrapped with a mixture of SAP and fluff pulp, which is used to store large amounts of liquid; the back layer is mainly made of PP breathable film, which mainly prevents the leakage of urine and plays an isolation role. Water-repellent PP spunbond non-woven materials and SMS-structured non-woven materials are commonly used to prevent side leakage at the leg openings.