Absorbent Core Three-Dimensional Basin Leakage
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Solution Overview
Problem
Modern diapers face challenges with leakage and discomfort due to sagging absorbent cores when saturated, despite improvements in design and elastic features, and there is a need for enhanced fluid handling and fit while maintaining low production costs and ease of application.
Innovation Solution
The absorbent article features a three-dimensional basin shape formed by folding guides in both the absorbent core and liquid management layers, which helps maintain contact with the wearer's legs and reduces leakage, with the liquid management layer being substantially free of superabsorbent polymer and designed to follow the basin shape of the core.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the absorbent core is made thinner by increasing SAP content, then the article thickness is reduced, but the core loses structural support and sags when saturated
Solution Approach 1:
The absorbent core is divided into a central portion and two side portions separated by folding guides. This segmentation creates a structured configuration that maintains structural integrity while reducing overall thickness. The side portions can be folded along the folding guides to provide structural support when the article is worn, preventing sagging even with high SAP content in the thinned central portion.
2Reliability
If elastic waist bands and barrier leg cuffs are added to maintain contact and fit, then leakage protection is improved, but device complexity and production cost increase
Solution Approach 1:
The absorbent core is designed with a three-dimensional basin shape featuring a curved bottom and upwardly extending sides. This curvature allows the core to conform to the wearer's body contours, maintaining contact and providing leakage protection through shape alone, eliminating the need for additional elastic components.
3Shape
If the absorbent core forms a three-dimensional basin shape, then fit and leakage protection are improved, but manufacturing precision requirements increase
Solution Approach 1:
The folding guides are pre-formed in the absorbent core during manufacturing, creating predetermined fold lines that guide the formation of the three-dimensional basin shape. These pre-formed guides ensure consistent and accurate folding during the manufacturing process, making it easier to achieve the desired basin configuration with high precision without requiring complex post-manufacturing assembly steps.
4Quantity of substance
If the liquid management layer contains superabsorbent polymer, then fluid absorption capacity is improved, but fluid acquisition speed and surface dryness are reduced
Solution Approach 1:
The liquid management layer is designed to be substantially free of superabsorbent polymer, extracting this component from the liquid management function. Instead, the liquid management layer uses other absorbent materials that provide faster fluid acquisition speed and better surface dryness, while the superabsorbent polymer is concentrated in the absorbent core for bulk fluid storage capacity.
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 design enhances dry and wet fit, reduces leakage, and ensures the diaper conforms symmetrically to the body, improving fluid handling and comfort while maintaining cost-effectiveness.
Implementation Method 1
an absorbent core between the topsheet and backsheet. The absorbent core comprises an absorbent material layer
Implementation Method 2
Modern diapers typically comprise an absorbent core containing a mixture of cellulose fibers and superabsorbent polymer ('SAP') particles as absorbent material
Implementation Method 3
an absorbent core containing a mixture of cellulose fibers and superabsorbent polymer ('SAP') particles as absorbent material
Implementation Method 4
superabsorbent polymer ('SAP') particles as absorbent material
Data Source
AI summary
An absorbent article, such as a diaper, comprising a topsheet, a backsheet and an absorbent core. The absorbent layer comprises a longitudinally-extending central portion, and a first and second side portions disposed transversally outward of the central portion. The absorbent core further comprises first and second folding guides between the central portion and the side portions. The central portion and the side portions form a three-dimensional basin when the absorbent core is folded along the folding guides. The article further comprises at least one liquid management layer substantially free of superabsorbent polymer between the topsheet and the absorbent core. The liquid management layer comprises a central portion, first and second side portions, and first and second folding guides which are at least partially superposed with the folding guides of the absorbent core.