What is the difference between diapers with different cores?
The first generation diaper core:
The first-generation core is formed by mixing fluff pulp and polymer water-absorbent resin (SAP), without layering or partitioning, and becomes a traditional core.
The first-generation core has a good water absorption effect, but because its structure is relatively loose, no adhesive is added, and the fluff pulp and SAP cannot be fixed, so there will be lumps and faults during use.
If hard lumps are found during use, it is because in the ratio of SAP to fluff pulp, the SAP content is too high and the mixing is not good. Most of them are to increase SAP and reduce fluff pulp in order to pursue water absorption one-sidedly. If the lump is soft, it means that the ratio of fluff pulp and SAP is relatively balanced, and generally it will not affect the baby's activities.
Second generation diaper core:
The second-generation core is a partition based on the first-generation core, which can play a certain role in fixing the fluff pulp and SAP, thereby reducing the phenomenon of lumping, but it cannot avoid the phenomenon of lumping.
Third generation diaper core:
The third-generation core adopts a composite core structure, which is composed of dust-free paper, non-woven fabric and SAP. The use of a composite core can make the diapers thinner, and the layers will not be lumpy.
Each layer of the third-generation core is bonded with hot-melt adhesive. The core contains a large amount of SAP to ensure the water absorption of the diaper. The disadvantage of using a composite core is that the process is more complicated, the production speed of the equipment is low, and the cost will be higher than the traditional core.
Fourth generation diaper core:
The fourth-generation core is further partitioned on the basis of the layering of the third-generation core.