Absorbent Core Channels and Pockets for Leakage Prevention
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Solution Overview
Problem
Absorbent articles for personal hygiene, such as diapers and sanitary napkins, face challenges with leakage due to the expansion of absorbent cores containing superabsorbent polymers, which can lead to reduced effectiveness of barrier leg cuffs and increased risk of leakage.
Innovation Solution
The absorbent article features a core wrap enclosing a high percentage of superabsorbent polymers with channels and a pocket configuration, where the channels and pocket are substantially free of superabsorbent polymers, providing improved containment and leakage prevention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If high amount of superabsorbent polymers are used in the absorbent core, then absorbent capacity is improved, but the core expands and causes barrier leg cuffs to lose contact with skin leading to leakage
Solution Approach 1:
The absorbent core is segmented into multiple functional zones: a first region with high SAP content for rapid absorption, a second region with reduced SAP content to control expansion, and a third region adjacent to barrier leg cuffs that is substantially free of SAP to maintain cuff contact and prevent leakage. This spatial segmentation resolves the contradiction by localizing expansion away from critical containment areas.
Solution Approach 2:
Different regions of the absorbent core are assigned different SAP concentrations tailored to their specific functions: the first region (high SAP) handles bulk absorption, the second region (reduced SAP) controls overall expansion, and the third region (SAP-free) ensures barrier leg cuff effectiveness. This local quality differentiation allows the core to simultaneously achieve high absorbent capacity while maintaining reliable leakage prevention.
2Quantity of substance
If the absorbent core expands when saturated, then absorbent capacity is utilized, but the barrier leg cuffs partially lose contact with wearer's skin reducing functionality
Solution Approach 1:
The absorbent core is divided into functional zones with the third region being substantially free of superabsorbent polymers and positioned adjacent to the barrier leg cuffs. This segmentation ensures that when the core absorbs fluid and expands, the SAP-free zone prevents expansion from pushing against the barrier leg cuffs, maintaining their contact with the wearer's skin and effectiveness.
Solution Approach 2:
The third region of the absorbent core is specifically designed with local quality differences (substantially free of SAP) to create a low-expansion zone that protects the barrier leg cuff interface. This local quality control allows the rest of the core to expand for capacity utilization while the protected zone maintains constant pressure contact for barrier effectiveness.
3Speed
If the absorbent core comprises high amount of SAP, then absorption speed is improved, but the core volume increases causing sagging in crotch region
Solution Approach 1:
The absorbent core is segmented into a first region with high SAP content for rapid absorption and a second region with reduced SAP content to control volume expansion. This segmentation allows the core to achieve fast absorption where needed while limiting overall volume increase that would cause sagging in the crotch region.
Solution Approach 2:
Different regions of the absorbent core are assigned different SAP concentrations: the first region has high SAP for rapid absorption speed, while the second region has reduced SAP to control volume expansion and maintain proper core positioning. This local quality differentiation resolves the contradiction between absorption speed and shape maintenance.
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 configuration enhances the absorbent article's ability to maintain effectiveness by preventing leakage and ensuring the barrier leg cuffs remain in contact with the skin, even when the core expands, thereby reducing the risk of fluid leakage.
Implementation Method 1
The function of the absorbent core is to absorb and retain the exudates for a prolonged amount of time
Implementation Method 2
The absorbent material comprises at least 80% of superabsorbent polymers by weight of the absorbent material
Data Source
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AI summary
The present disclosure is directed, in part, to an absorbent article comprising an absorbent core enclosing an absorbent material comprising superabsorbent polymers. The absorbent core comprises a first channel and a second channel, both of which are substantially free of the superabsorbent polymers and are at least partially oriented in a longitudinal direction of the article. The first and second channels each have lateral widths taken parallel to a lateral axis. The absorbent core comprises a pocket that is substantially free of the superabsorbent polymers and that has a portion on a longitudinal axis of the article. The pocket has lateral widths taken parallel to the lateral axis. A profile of the sum of the lateral widths of the first and second channels and the lateral widths of the pocket over a longitudinal length of at least 50mm taken along the longitudinal axis has two separate substantially constant portions.