In the manufacturing process of baby pants, the role of the guide layer can not be ignored. Guide water molecules into the designed structure, which plays a role similar to the transmission pipeline. Therefore, special attention should also be paid to the constituent materials. However, how to determine the material structure of this layer also needs repeated tests. Next, briefly introduce the material structure.

Arrangement and orientation of fiber mesh in baby pants

The special structure of human body requires that the longitudinal length of infant pants is longer than the transverse width, which requires the diversion layer to guide the longitudinal diffusion of urine, so that the whole infant pants can absorb urine more evenly. According to the characteristics of nonwoven web technology, the material is qualitatively analyzed, and the arrangement of fibers in fiber web is analyzed by quoting the aspect ratio theory. Fiber webs with high MD / CD values show that there are more fibers along the machine output direction than perpendicular to the machine output direction. This fibrous web structure allows the urine to diffuse longitudinally.

In the ideal structure model, most fibers are arranged along the output direction of the machine, and a few fibers are arranged perpendicular to the output direction of the machine. The structure of the fiber net determines that most of the fluid flows along the longitudinal direction of the material and a few flows along its transverse small tributaries. In the actual structural model of thermally bonded nonwovens, most of the fluid flows along the longitudinal direction of the material, but in the process of fluid flow, the fluid is blocked by laterally arranged fibers, the flow rate slows down, and some of the fluid is transferred to the transverse direction of the material.

The composite structure of diversion layer + damping layer is designed. Among them, the fibers in the fiber web in the diversion layer are arranged along the output direction of the machine, and the fibers in the fiber web in the damping layer are arranged perpendicular to the output direction of the machine. The diversion layer can fully guide most of the liquid to diffuse along the longitudinal direction, and the damping layer acts as a barrier to prevent the incompletely diffused liquid from being absorbed by the absorption core layer too early, and temporarily store the liquid in the diversion layer to fully diffuse the liquid.

Baby pants material fluffy

The fluffy of the guide layer material affects not only the liquid absorption capacity of the material, but also the liquid absorption rate. According to the research of fibervision, with the increase of fluffy degree, the relationship between fluffy degree of nonwovens and liquid absorption rate will also increase. Therefore, the structure of the material must be loose, which can not only increase the total absorption of the liquid, but also accelerate the absorption speed of the liquid.

In general, the analysis of the material structure of the guide layer of baby pants is also to find out whether the performance plays a role in the layer. When it comes to performance analysis, we should not only the material structure, but also the role of fiber in it.