Adult Diaper & Adult Healthcare Absorption Core Mechanics: Sumitomo / San-Dia SAP Ratios vs Rewet Physics Under 0.2g (ISO 11948-1 Rothwell Standard)
In clinical adult healthcare and elder nursing facilities, the primary cause of Incontinence-Associated Dermatitis (IAD) and decubitus ulcers (bedsores) is prolonged skin exposure to moisture and ammonia under pressure. Achieving an ultra-low rewet value (< 0.20g under 0.5 psi patient bodyweight load) is the benchmark separating hospital-grade medical adult diapers from generic commodity briefs.
1. Super Absorbent Polymer (SAP) vs Fluff Pulp Ratio Optimization
Shenghongda utilizes high-permeability, spherical cross-linked sodium polyacrylate polymers sourced directly from Sumitomo Seika (Japan) and Sanyo Chemical (San-Dia) blended in an aerated matrix with virgin Weyerhaeuser Southern Pine Fluff Pulp. While fluff pulp provides instantaneous liquid capillary diversion (< 10 seconds acquisition), SAP provides high Centrifuge Retention Capacity (CRC ≥ 32 g/g) and Absorbency Under Load (AUL at 0.7 psi ≥ 22 g/g), permanently locking fluid inside the polymer hydrogel lattice.
| Adult Diaper Tier | Target Sizing | Sumitomo SAP Weight | FSC Fluff Pulp | Rothwell Absorbency (ISO 11948-1) | Rewet Under 0.5 psi Load |
|---|---|---|---|---|---|
| Daytime Light Care (Hospital Ward) | M / L | 10g ± 0.5g | 70g | 1,400 ml – 1,600 ml | ≤ 0.20 g |
| Standard Overnight Incontinence | M / L / XL | 12g – 15g | 80g – 85g | 1,800 ml – 2,400 ml | ≤ 0.15 g |
| Maxi Super Heavy / Bariatric Night | L / XL / XXL | 18g – 22g | 95g – 105g | 2,800 ml – 3,500 ml | ≤ 0.12 g |