How do diapers absorb urine? What determines the amount of urine?

After every baby is born, the company of diapers is indispensable. Can a thin layer of diapers absorb the amount of urine that the baby urinates several times? How does it do it? What determines the amount of urine taken? Let's take a look at this article by the diaper manufacturer with these questions. Baby diapers generally have a four-layer structure. The ultra-high water absorption capacity and water retention capacity of diapers benefit from its water-absorbing materials and structural design. 1. Surface layer: made of non-woven fabric, directly in contact with the baby's skin, receiving liquid and transferring to the next layer; 2. Conductive layer: made of non-woven fabric, uniformly transmitting the liquid received by the surface layer to the absorbent layer ; 3. Absorbent layer: It is a mixture of polymer water-absorbing resin (SAP) and fluff fibers. It is the most important functional layer in diapers for absorbing and storing urine; 4. Bottom layer: PE film or PE film + Made of non-woven fabric, the main function is to prevent leakage. How do diapers suck the baby's urine away? 1. Polymer absorbent resin Many mothers are naive to think that the baby's diapers are made of cotton and rely on cotton to absorb water. When you uncover the surface of the diaper, you will find that there are bead-like particles inside, mixed with fluff fibers. Although cotton absorbs water, the water absorption speed and water retention capacity are far less than the new polymer water-absorbing resin. Polymer water-absorbing resin (SAP) is a typical functional polymer material. SAP is shaped like a small bead with a diameter of only about 0.2mm. It can absorb water hundreds or even thousands of times its own weight, and has a strong water retention capacity, so it is also called a super absorbent or high water retention agent. The reason why SAP has super water absorption capacity is because super absorbent resin is a low crosslinking or partially crystalline polymer with many hydrophilic groups. When the SAP particle size is 100~120mesh (ie 0.212mm~0.254mm), the absorption capacity is the best; when the pH value is 6~8, the absorption rate is the largest. The SAP of the absorbent layer of the diaper is evenly mixed with the fluff fibers. The uniform mixing of the SAP and fluff fibers can make the liquid absorption uniform, and also avoids gel adhesion and hard spots penetrating the surface of the paper web, and prevents interlayers Slippage occurs. 2. Penetrate the lower layer. Regardless of the diaper being only a thin piece, there are 4 layers inside: the surface layer, the flow guide layer, the SAP absorbent core layer and the bottom layer. The baby excretes urine out of the body. First, the surface layer of the diaper receives the urine and penetrates downward, and then the drainage layer receives the urine that has penetrated from the surface layer. Part of the urine is directly absorbed by the next layer of SAP along the gap. Body absorption, the rest of the liquid conducts and diffuses along the longitudinal direction of the flow guide layer, which enlarges the absorption area of u200bu200bthe SAP absorbent core. Finally, the urine after longitudinally diffused along the flow guide layer penetrates to the next layer to make the SAP absorbent core uniform To absorb. The surface layer of the diaper is in direct contact with the baby’s butt, and is the first layer to receive urine; the diversion layer guides the urine that penetrates from the surface to conduct and diffuse along the longitudinal direction of the diaper, so that the urine is evenly absorbed by the core Absorption does not cause the diaper to become locally thick due to several kinds of liquid absorption, hindering subsequent urine absorption by the absorbent core; the SAP absorbent core layer is the layer that finally absorbs and stores urine; the bottom layer can effectively prevent leakage. 3. Water-locking SAP, the absorbent material of diapers, is a kind of high molecular compound, with many atoms attached to the molecule that can be close to water. Therefore, water molecules are quite easy to be attracted to its molecules and squeeze between the molecules, so that the SAP particles are enlarged and integrated. SAP itself is insoluble in water and can absorb water hundreds to thousands of times its own weight without extravasation. For example, rice is cooked with mature rice. Although the rice grains contain a lot of water, the water will not flow out; flour and water are kneaded into a dough, and the water inside will not be squeezed out no matter what the dough is squeezed. Similarly, SAP not only has strong water absorption capacity, but also has strong water retention capacity. Next: Fujian Diapers: What is the use of pull-up pants? Is it the same as a diaper?