The current diaper structure is generally a four-layer structure.（Click to share to LinkedIn）
1. The surface layer is made of non-woven fabric. The surface layer is directly in contact with the baby's skin, accepts liquids and transmits it. The surface layer has high requirements for materials, soft hand feeling, and does not affect the baby's skin.
2. The conductive layer is made of special non-woven fabric. The conductive layer is the most important item in thin or ultra-thin diapers. The conductive layer transfers the liquid received by the surface layer to the absorbing layer. This layer is required to be able to provide enough space for storage and transfer a sufficient amount of liquid as soon as possible.
3. The absorbent layer is made of toilet paper + fluff pulp + SAP, which is the most important functional layer in diapers.
4. The bottom layer is generally made of PE film or PE film + non-woven material. The function of the bottom layer is to prevent leakage. The composite bottom layer used nowadays is more cloth texture and feel better.
The key to the water absorption performance of diaper lies in the absorption layer. The core part is the "core", which determines the absorption capacity, absorption speed, water retention capacity of the diaper, and whether it is faulty. It can be said that the core is good or bad directly determines the performance of diapers.（Click to share to Facebook）
The evolution of the core
The core of diapers has undergone a transformation from the first generation core to the second generation traditional core. The core of the first generation of diapers is actually a simple cotton core, with very limited absorption capacity; the second generation of diapers is mainly composed of polymer absorbent material and wood pulp as the main body of the core. Now we buy from major brands on the market Basically, diapers use second-generation cores. However, the second-generation traditional core has limitations in its diversion, water absorption speed, and strength, which can easily lead to uneven absorption, high back infiltration, easy fracture, and discomfort to the baby. In severe cases, it may even cause urine leakage and redness. rash.
The reason why the third-generation core diapers has attracted attention from all walks of life is that compared with the second-generation traditional core diapers, the third-generation core diapers have achieved a revolutionary breakthrough. They are more compact, lighter and thinner, not easy to reverse osmosis, continuous layering, The characteristics of non-clumping, etc., fully solve the problems of dryness, breathability, lightness, and suitable for multiple excretion use that cannot be broken by the traditional second-generation core.
The same is the third-generation core, and there are also performance differences. We know that the basic problem solved by diapers is to absorb urine. The backside is supported by water-absorbing polymer. Therefore, the quality of water absorption = the mass of water-absorbing molecules X the amount added. Internationally, there are only a handful of manufacturers that provide polymers with mixed quality. Depending on the amount of urine absorbed per unit of polymer and the unit of absorption time, there will be different types of polymer. At present, Sumitomo and Sanya are the top polymers with the highest quality in the world.（try Suntech diaper machine）
Core structure comparison
The structure of the diaper also affects water absorption. Most diapers in the world, including Japan, use wood pulp + water-absorbing molecular structure. This structure has the obvious characteristic of being thicker. Because wood pulp is used to fix the polymer, it will cause excessive water absorption and water absorption. The movement of the glue, this is the legendary fault lump, in fact, does not affect the effect of his absorption, thinking that this phenomenon will only occur when the urine is full.
China's diapers have modified the wood pulp structure. It uses the overall fluffy fiber to fix the absorption molecules, which solves the phenomenon of gel displacement after absorption. This requires the use of more polymers, higher costs, and is made lighter and thinner. .
China's diapers basically use improved composite cores, and foreign countries are all wood pulp structures, and foreign consumers pay attention to absorption, and do not pay attention to workmanship. Japanese diapers work well.
The second key to the water absorption of diapers is the diversion layer. The diversion layer is located between the surface layer and the absorbent core layer, which enlarges the liquid diffusion range, has a high liquid absorption rate, and has the functions of rapid liquid capture, temporary liquid storage, diffusion diversion, anti-reverse seepage, and anti-side leakage. Non-woven materials. Without the rapid diversion liquid of the diversion layer, the core cannot quickly absorb the liquid. If there is no diversion layer to prevent reverse seepage and side leakage, even if the absorption performance of the core is good, urine leakage may occur.
Diversion layer materials include cellulose fibers, PET fibers, modified cellulose fibers, hollow fibers, eccentric fibers, high-coil fibers and other non-woven materials made by chemical bonding and reinforcement with ES fibers reinforced or specially treated by hot air. The guide layer is also divided into hot-air non-woven fabric and ordinary non-woven fabric. Hot-air non-woven fabric can reduce the amount of hot melt adhesive used in the diaper manufacturing process.
There is also a composite diversion layer in the diversion layer, the structure is diversion layer + damping layer, the fibers of the diversion layer are arranged longitudinally, and the fibers of the damping layer are highly cluttered. This kind of guide layer can make the liquid fully diffuse, and the damping layer prevents the undiffused liquid from being absorbed by the core prematurely, temporarily spreads the liquid existing in the guide layer fully and diffuses, and at the same time has a good back seepage effect.
It can be seen that both the core and the guide layer affect the water absorption of diapers. The core is made of polymer absorbent material and wood pulp material, and the diversion layer is made of hot air non-woven fabric, which has good water absorption. In addition to material selection, production technology is also very important.
At present, there is no shortage of excellent diaper manufacturers on the market, but there are not many excellent diaper manufacturers. Suntech produces diapers and diapers products based on the "precision manufacturing" standard, 50 years of technical precipitation and design experience, to care for the baby's health and start from the heart.