The guide layer is a non-woven material used for sanitary napkins, baby diaper and other disposable sanitary products. In China, the material involved is still a new concept and is rarely studied in China. Large foreign companies have carried out research on materials earlier. At present, 90% of domestic high-end diversion layer materials rely on imports, and related technologies are monopolized by foreign Kimberly-Clark, Procter & Gamble, Unicharm, and Kao. In this context, only by studying the manufacturing technology, structure and performance of new materials can we master key core material technologies and lead product upgrades and iterations.

Baby diaper fiber mesh composite structure with high conductivity

First, the high conductivity fiber mesh composite structure was investigated. By studying the diversion mechanism of the diversion layer material, it is found that the liquid diffuses in the longitudinal direction of the material, which can expand the absorption area of ​​the absorbent core; the penetration of the liquid in the vertical direction can improve the absorption capacity of the absorbent core in the vertical direction. In this subject, a new concept of composite diversion layer material is designed, including traditional diversion layer and barrier layer. The fiber structure of the diversion layer fiber mesh is directional arrangement, so the liquid can be better diffused in the fiber mesh; the fiber mesh of the barrier layer adopts the random arrangement of fibers, which not only has a certain water permeability, but also prevents the liquid from permeating too fast and cannot be in the conduction layer. Diffusion in the flow layer. Therefore, this special structure can maximize the balance between the longitudinal and vertical penetration of the absorptive layer material.

Baby diaper coarse denier bicomponent fiber carding process

Secondly, the carding process of coarse denier bicomponent fibers is studied. . Connecting two cards to form a web increases production speed, product basis weight and product uniformity. However, the two carding machines use the same carding technology and can only card 1.5~3d fibers. Aiming at the deficiencies of the carding system of the above production line, this topic proposes a new technical transformation plan for the second carding machine of the carding system, and the cardable fiber fineness has reached more than 6~8d.

Baby diaper composite network and thermal consolidation technology

Finally, the composite web and thermal consolidation technology are studied. By designing a new type of cohesive roller web system, the fibers can be oriented and output at high speed. Technologically transforming the netting curtain, temperature sensor and pre-cooling device will make the composite guide layer material more fluffy and greatly reduce the energy consumption of the oven; in addition, through the transformation of the cooling system, the softness of the guide layer material will be greatly improved.

Through the above research, the baby diaper sample has the advantages of good fluffiness, strong liquid absorption ability, and good drainage effect. The shortest liquid penetration time of the sample is 1.76s, and the slippage amount is 0g.