Absorbent Article With Layered Core Opening For Fluid Distribution
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Solution Overview
Problem
Conventional absorbent articles face issues with inefficient vertical wicking and liquid distribution due to capillary collapse in cellulosic materials, leading to leakage and discomfort, as body exudates are not effectively spread throughout the absorbent core, causing premature failure and discomfort.
Innovation Solution
The absorbent article features a layered structure with a fluid intake layer, absorbent core, and distribution layer, where the absorbent core opening is smaller than the fluid intake layer opening, creating a spatial gap that allows body exudates to directly reach the distribution layer, which then distributes fluids in the longitudinal direction, enhancing absorption and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If cellulosic material is used for absorption, then absorbency is improved, but capillary collapse occurs preventing efficient liquid distribution
Solution Approach 1:
The absorbent core is divided into multiple functional layers: a fluid acquisition layer for initial absorption, a distribution layer for liquid redistribution, and a fluid conveyance layer for vertical transport. This segmentation prevents capillary collapse in any single layer while maintaining overall absorption efficiency and reliable liquid distribution throughout the core.
Solution Approach 2:
The distribution layer acts as an intermediary between the fluid acquisition layer and the conveyance layer. It receives liquid from the acquisition layer, redistributes it to prevent localized saturation and capillary collapse, and then conveys it to the conveyance layer for further transport, ensuring continuous reliable liquid distribution.
2Quantity of substance
If absorbent core capacity is spread over greater area, then absorption capacity is improved, but body exudates are not efficiently spread throughout the core
Solution Approach 1:
Different regions of the absorbent core are assigned different functions: the fluid acquisition layer handles initial liquid intake at specific zones, the distribution layer spreads liquid horizontally across the core width, and the conveyance layer transports liquid vertically. This local differentiation ensures efficient liquid spread throughout the entire core area while maintaining high absorption capacity.
3Quantity of substance
If capillary walls collapse inward, then absorption is reduced, but this leads to early failure of the absorbent article
Solution Approach 1:
The distribution layer is positioned beforehand to prevent capillary collapse in the acquisition and conveyance layers. By providing an additional pathway for liquid distribution, it cushions against the harmful effects of capillary collapse, ensuring the absorbent core maintains its absorption capability and service life even when some capillaries collapse under saturation.
4Reliability
If body exudates remain at top surface, then penetration is prevented, but wearer experiences wet discomfort
Solution Approach 1:
The distribution layer is positioned to perform preliminary liquid redistribution before liquid can accumulate at the topsheet interface. It actively spreads liquid laterally and conveys it downward, preventing liquid from remaining at the top surface and causing wet discomfort, while ensuring reliable penetration into the absorbent core.
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
This configuration improves vertical wicking and liquid distribution, minimizing leakage and maintaining comfort by ensuring effective absorption and distribution of body exudates, thereby extending the absorbent article's effectiveness and user comfort.
Implementation Method 1
the distribution layer is positioned below the absorbent core in the depth direction of the absorbent article and capable of distributing fluid in at least the longitudinal direction of the absorbent article
Implementation Method 2
when body exudates are absorbed by the cellulosic material, the capillary walls of the cellulosic material can collapse inward
Data Source
AI summary
An absorbent article can have a top sheet layer, a back sheet layer, and an absorbent system positioned between the top sheet layer and the back sheet layer. The absorbent system can have at least a fluid intake layer, an absorbent core, and a distribution layer. The fluid intake layer can define a fluid intake layer opening and the absorbent core can define an absorbent core opening. A void space is present between the top sheet layer and the distribution layer and the top sheet layer is maintained in a spaced apart relationship from the distribution layer.