Layered Absorbent Core Structure for Wet Integrity and Conformability
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Solution Overview
Problem
Existing absorbent articles face a trade-off between comfort and wet resiliency, as densified structures provide better absorbency but compromise conformability, while thinner structures improve conformability at the cost of wet integrity and structural stability.
Innovation Solution
A disposable absorbent article with an absorbent core structure comprising upper and lower nonwoven layers made of resilient polymer fibers and an inner core layer containing a mixture of cellulosic fibers and superabsorbent particles, sealed at the perimeter to maintain shape and integrity without densification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the absorbent core structure is densified to increase capillarity and fluid transport ability, then fluid absorption performance is improved, but the stiffness and comfort are reduced, compromising the ability to conform to the wearer's anatomy
Solution Approach 1:
The absorbent core structure is divided into multiple functional layers: an acquisition layer for fluid intake, a distribution layer for fluid transport, and a storage core for fluid retention. This segmentation allows each layer to be optimized independently - the storage core can be densified for capillarity while the acquisition and distribution layers maintain lower density for comfort and conformability.
Solution Approach 2:
The patent employs composite materials combining cellulose fibers with synthetic binder fibers in specific ratios and configurations. The cellulose provides capillarity and absorption, while the synthetic fibers provide structural integrity and controlled stiffness. This composite approach enables the core to maintain shape and provide comfort while still achieving effective fluid transport through capillary action.
2Reliability
If synthetic binder fibers are added to enhance wet integrity and facilitate fluid transport, then fluid management performance is improved, but the bending stiffness increases, reducing comfort and conformability
Solution Approach 1:
Synthetic binder fibers are strategically placed in specific regions and orientations within the absorbent core structure, particularly at the boundaries between layers and in areas requiring structural support. This localized placement provides wet integrity where needed while minimizing the overall bending stiffness of the core, allowing it to remain comfortable and conformable during wear.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The absorbent article achieves comfortable conformability to the wearer's anatomy while maintaining effective fluid management and structural stability, even when wet, by leveraging resilient nonwoven layers to recover shape and resist deformation.
Implementation Method 1
the core can be densified to increase capillarity and the ability to pull fluid effectively from the acquisition-distribution layer above
Implementation Method 2
an inner core layer disposed between the upper nonwoven layer and the lower nonwoven layer, wherein the inner core layer comprises from about 50% to about 85% cellulosic fibers, by weight of the inner core layer, and from about 15% to about 50% superabsorbent particles
Implementation Method 3
the absorbent core structure has an average density of between about 0.045 g/cm3 and about 0.15 g/cm3, wherein the inner core layer is contained within the upper nonwoven layer and the lower nonwoven layer by substantially sealing at least a left side region and a right side region of the upper nonwoven layer and the lower nonwoven layer at a perimeter seal
Data Source
AI summary
A disposable absorbent article having a topsheet, a backsheet, and an absorbent core structure disposed therebetween. The absorbent core structure includes an upper nonwoven layer comprising polymer fibers and having a basis weight of from about 35 to about 85 gsm; a lower nonwoven layer comprising polymer fibers and having a basis weight of from about 10 to about 40 gsm; and an inner core layer disposed between the upper and lower nonwoven layers. The inner core layer comprises from about 50% to about 85% cellulosic fibers, by weight of the inner core layer, and from about 15% to about 50% superabsorbent particles, by weight of the inner core layer. The absorbent core structure has an average density of between about 0.045 g/cm3 and about 0.15 g/cm3. The inner core layer is contained within the nonwoven layers by substantially sealing at least a left and right side region of the upper and lower nonwoven layers.