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Structure and material analysis of diapers
Modern diapers generally consist of three main parts in terms of structure: surface covering layer, absorbent core layer and base fabric. If it comes to the dismantling of specific materials, it can be roughly divided into the following parts: including the surface non-woven fabric, and the side water-proof fabric. The most important part of this part is to increase the degree of air permeability inside the diaper to let the body emit moisture. The qi and heat can be discharged in time, so as not to irritate the baby's skin and cause eczema and red buttocks.
As an ordinary diaper, the fabric cannot prevent the two-way conduction of urine, which means that when a certain absorption amount is reached, the urine will penetrate from the surface of the fabric in both directions. When it penetrates to the outside, it leaks urine, and when it penetrates to the inside, it is reverse. Infiltrate. Healthy skin should be dry, while moist skin is very fragile and can easily cause eczema (diaper rash) and red buttocks. Most of the non-woven fabrics used in diapers have certain semi-permeable membrane properties. The specific principle is very complicated. It is roughly through micron-level vents to prevent the penetration of water molecules and ensure the smooth flow of air, and keep the surface of the diaper dry. .
This is the same on the outer membrane. Absorbent core layer: It consists of wood pulp, polymer materials, diversion layer, and wet-strength paper. This layer is mainly used to quickly absorb, disperse and store urine. The internal material directly determines the amount of water absorbed.
When choosing diapers, large quantity is still an important consideration. After the urine is evenly dispersed through the diversion layer, the larger the amount of diapers, the longer the baby's dry feeling, and the polymer material that absorbs water can also be as soft as possible. Especially at night, a large amount of diapers can guarantee as long a sleep time as possible.
The current high-quality diapers are mainly composed of wood pulp and polymer materials (also called water-retaining agent or super absorbent, which is a kind of translucent beads). The wood pulp fiber structure has a large number of irregular voids. These natural voids have super hydrophilic properties after processing and can hold a larger amount of water.
Polymer absorbent resin is a new type of functional polymer material. It has a high water absorption function that absorbs water several hundred to several thousand times heavier than itself, and has excellent water retention performance. Once it absorbs water and swells into a hydrogel, it is difficult to separate the water even if it is pressurized.