Whether the pants type sanitary napkins have lumps or breaks is mainly related to the structure, material quality, and usage of the absorbent core.

From the perspective of the core structure, high-quality pants shaped sanitary napkins will adopt a layered water locking design. The absorbent core is composed of multiple layers of flow guiding layers, absorption layers, and water locking layers. The flow guiding layer can guide menstrual blood to spread evenly and avoid local accumulation; The absorption layer is mixed with high-density fluff pulp and SAP, and fixed with hot melt adhesive to prevent the displacement of core fibers; The water locking layer can firmly lock in menstrual blood and reduce the deformation of the core after expansion. After absorbing menstrual blood, the core of this type of product can maintain uniform expansion and is less prone to lumps or fractures. The core structure of inferior products is simple, consisting only of a single layer of fluff pulp mixed with a small amount of SAP, and there is no fixed process. After blood absorption, the fluff pulp is prone to clumping due to moisture, and the SAP expands unevenly, causing the core to clump and the core fibers to break during movement, resulting in fractures.

The quality of the material is also crucial. High quality fluff pulp fibers are long, tough, and not easily broken. SAP particles are uniform and not easily clumped after absorbing water and expanding; Poor quality fluff pulp has short fibers, high impurities, and is prone to breakage after absorbing water. SAP particles vary in size and can easily form lumps after expansion.

The usage method can also affect the state of the core. If the size is too small when worn, the tight fit of the pants will squeeze the core, causing deformation and fiber displacement, increasing the probability of clumping and fracture; If there is excessive menstrual activity, frequent friction or squeezing of the core may also damage the structure of the core.

When making a selection, buyers can check the product core structure description and prioritize products with "layered water locking" and "anti pilling" designs. At the same time, refer to other user reviews to avoid purchasing styles with easily deformed cores. Choosing the appropriate size during use and avoiding excessive compression can reduce the problem of lumps and faults.