Moisture-responsive lattice for fluid distribution and ventilation in diapers
A moisture-responsive lattice insert that uses superabsorbent polymer (SAP) swelling to open fluid and ventilation channels in diapers. It resists wet collapse under body weight, prevents gel blocking, and maintains air and vapor transport, offering thermal comfort with minimal changes to existing diaper manufacturing.
Overview
This technology is a moisture-responsive open-cell lattice insert designed to replace or augment the core and acquisition-distribution layer (ADL) in diapers. Inspired by turgor pressure in plant cells, the insert confines the diaper's existing superabsorbent polymer (SAP) granules within a cellular scaffold to form a prestressed 3D spacer. When wetness occurs, SAP swelling generates internal osmotic prestress that mechanically opens fluid and ventilation channels exactly where needed. This passive, reversible actuation improves fluid distribution, reduces gel blocking, and maintains an air gap between the wet core and skin for continuous vapor and air transport.
Technical specifications
Key features:
- Uses existing diaper SAP granules—no new absorbent material required
- Confined SAP granules generate repeatable internal prestress and tunable mechanical stiffness
- Passive moisture actuation activates only under wet or humid conditions
- Increased stiffness under swelling resists wet collapse under body weight and compression
- Improves fluid distribution, prevents gel blocking, and maintains microclimate ventilation
A mechanical model predicts lattice response to moisture and load-bearing capacity, reducing trial-and-error. Prototypes are intended to use standard diaper materials and support high-speed converting compatibility.
Technology readiness level
The concept is demonstrated in laboratory experiments showing repeatable actuation and tunable stiffness. It is at an early development stage. Validation plans include optimizing lattice dimensions for body loads, fabricating diaper-grade prototypes, and testing wet compression, fluid acquisition, and microclimate evaporative heat flux under body-weight and humidity conditions. ISO-based safety assessments and web-handling compatibility studies are planned, ending with leakage, absorbency, comfort validation—targeting greater than 1 °C microclimate cooling—and cost/scale-up assessment.
About Columbia University
Columbia University is a comprehensive private research university in New York City, combining an Ivy League academic profile with globally engaged scholarship and professional education. Its integration with a major hospital system through Columbia University Irving Medical Center and NewYork-Presbyterian enables clinical collaboration, access to diverse patient populations, and regulated studies at scale. State-of-the-art laboratories and shared core facilities across the Morningside and Manhattanville campuses support co-located industry projects, while proximity to New York’s finance, media, and healthcare ecosystems streamlines talent pipelines and pilot deployments. Industry engages via sponsored research, affiliate programs, executive education, and convenings that connect faculty expertise with corporate R&D priorities. Research is supported by competitive federal funding from agencies such as NIH, NSF, DOE, and DoD, alongside New York State and philanthropic sources. Columbia Technology Ventures provides IP management, licensing, startup support, and translational funding mechanisms that lower barriers to commercialization.
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