What Is Absorbent Core?
Direct Answer
The absorbent core is the central layer of a diaper or pad that stores liquid, typically a blend of fluff pulp and superabsorbent polymer.
Key Takeaways
- The absorbent core is the central layer of a diaper or pad that stores liquid, typically a blend of fluff pulp and superabsorbent polymer.
- How it works: Liquid passes through the topsheet into the core, where fluff pulp wicks it quickly across the core while SAP locks it in as gel.
- Channeled cores pull liquid to the middle to reduce side leaks
- Myth: A thicker diaper holds more. Modern thin SAP cores can hold more than thick fluff cores
How Absorbent Core Works
Liquid passes through the topsheet into the core, where fluff pulp wicks it quickly across the core while SAP locks it in as gel. Core design (channels, thin vs. thick) determines speed, capacity and leak resistance.
Examples and Applications
- Channeled cores pull liquid to the middle to reduce side leaks
- Thin '3rd generation' cores use mostly SAP for low bulk and high capacity
Absorbent Core vs. Related Terms
| Term | What it is | Key difference |
|---|---|---|
| Topsheet | Absorbent Core | Topsheet moves liquid into the core; the core stores it |
Limitations and Common Misconceptions
- Myth: A thicker diaper holds more. Modern thin SAP cores can hold more than thick fluff cores
- Myth: Cores only matter at night. Daytime leaks are often a core-wicking problem
What is the absorbent core made of?
A blend of cellulose fluff pulp and superabsorbent polymer (SAP) granules. Fluff absorbs and channels quickly; SAP locks moisture away as a gel.
How does the core keep skin dry?
SAP traps liquid inside its gel network so it cannot flow back to the surface, keeping the topsheet dry under pressure.
What is gel blocking in a diaper core?
If SAP swells too fast, top granules form a gel wall that blocks liquid from reaching dry SAP below, causing pooling and leaks. Good cores balance absorption speed and gel strength.
References
- Pampers Official - What's in a Pampers diaper (component materials) — 品牌官方 (accessed 2026-08-02)
- BASF - Superabsorbents (HySorb / SAVIVA), how SAP works — BASF (accessed 2026-08-02)