The structure and raw materials of diapers
The structure of the diaper is generally five layers.
1. Surface layer; 2. Diversion layer; 3. Absorbent core body; 4, bottom film; 5. Prevent side leakage.
Surface layer
The surface is directly in contact with the baby's delicate skin, so it requires soft and breathable, does not absorb water itself, can keep the child's body dry, quickly absorb urine and prevent lateral leakage.
The material used for the surface layer is non-woven fabric. The most commonly used in the field of diapers are hot air non-woven fabric and spunbonded non-woven fabric, of which the performance of hot air non-woven fabric is better.
Diversion layer
The diversion layer is located between the surface layer and the absorption core, and its function is to make the diaper absorb liquid quickly, effectively and evenly. Because baby urine is arranged in the part of the diaper, if not timely and quickly dredging to other positions, it will lead to the local core body of the diaper due to excessive absorption and blockage, resulting in back seepage.
Compared with the surface layer, the fibers of the diversion layer are mainly arranged vertically. When urine reaches the diversion layer, the fiber network of the diversion layer will immediately absorb the liquid. After temporary storage, the liquid will be diffused along the longitudinal fibers until it is absorbed by the core layer, avoiding the phenomenon of local blockage and reinfiltration due to large amount of liquid absorption in the core layer.
Absorbent core
They are usually divided into two core structures: one is full core. The other is a composite paper core. The composite core is composed of fluff and polymer water absorbent resin (SAP), while the full core is mainly composed of polymer water absorbent resin (SAP). Compared with the composite core, the full core has thinner thickness, better air permeability and water absorption.
Bottom membrane
The bottom film looks like a plastic film, but it's actually a breathable micropore film. The micropore is the most critical part, because the minimum diameter of a water drop is 20µm, and the diameter of a water vapor molecule is 0.0004µm, and the micropore diameter is in between. In this way, it is breathable and impermeable to water.
Guard against side leakage
The leg mouth anti-lateral leakage side is located on both sides of the thigh mouth and connects the surface layer. Its function is to prevent urine from leaking out from the side because it can not be timely leaked down.
For a diaper, there are many kinds of raw materials, but the largest proportion, the most important is nothing but the above introduced several. You see, the little diaper doesn't look complicated, but there's really a lot of technology in it.
