Fluid Dynamics, Superabsorbent Polymer (SAP) Kinetics & Absorbent Core Construction
Polymer engineering study on fluid absorption kinetics, gel-blocking prevention, gradient SAP-to-fluff core structures, and ultra-thin composite cores.
Engineering Summary & Polymer Fluid Kinetics: Quanzhou Shenghongda Hygiene Products Co., Ltd. engineers advanced fluid management cores that solve the industry problem of gel-blocking under high-volume urine insults. In conventional cores, excessive localized superabsorbent polymer swelling seals interstitial spaces, preventing fluid from penetrating deeper into the pad. Shenghongda's R&D team, led by Dr. Lin Jianhua, implements a dual-zone gradient core: a high-porosity sub-layer of virgin softwood fluff pulp rapidly draws fluid away from the skin within 2 seconds, while cross-linked Japanese Sumitomo Seika SAP particles in the lower reservoir immobilize the liquid under osmotic pressure. For ultrathin active pull-ups, we manufacture heat-bonded composite cores without free fluff, achieving a dry core thickness of only 1.8 mm while maintaining over 900 ml of saline retention. All core structures are tested under ISO 11948-1 protocols.
Empirical Engineering Parameters & Laboratory Verification
The following technical performance matrix details verified operational standards, testing fixtures, and pass/fail thresholds enforced under Shenghongda's ISO 13485:2016 quality management framework:
| Core Architecture | Material Composition | Core Thickness | Absorption Speed | Rewet Performance |
|---|---|---|---|---|
| Dual-Zone Gradient Core | Sumitomo SAP (60%) + Weyerhaeuser Fluff (40%) | 3.8 โ 4.5 mm | < 2.2 seconds | < 0.08 g under 4.0 kPa |
| Ultrathin Composite Core | Immobilized SAP Sheet + Spunbond Web | 1.6 โ 2.0 mm | < 2.8 seconds | < 0.05 g (Zero clumping) |
| Triple-Channel Air-Laid Core | Multi-Layer Fluffless SAP Laminate | 2.2 โ 2.6 mm | < 2.5 seconds | < 0.06 g (Active mobility) |
| Heavy Clinical Bariatric Core | High-Grammage SAP + Virgin Fluff Matrix | 5.5 โ 6.5 mm | < 3.0 seconds | < 0.12 g (Overnight 2,500ml) |
| Feminine Anion Core | Ultrathin Polymer Web + Herbal Microcapsules | 1.2 โ 1.5 mm | < 1.8 seconds | < 0.02 g (Surface dryness) |
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