Absorbent Core Three-Dimensional Basin Leakage Prevention
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Solution Overview
Problem
Modern diapers face challenges with sagging due to fluid weight, leading to loss of contact with the thighs and increased leakage, despite improvements in absorbent core designs and elastic features, necessitating enhanced dry and wet fit, comfort, and fluid handling while maintaining low production costs and easy application.
Innovation Solution
The absorbent article features a core with a central portion and side portions separated by folding guides, forming a three-dimensional basin shape when folded, with winglets and gaps that close to create side walls, and may include an elasticized element for spontaneous folding, along with a liquid management layer to improve fluid acquisition and distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core is made thicker to improve absorption capacity, then fluid handling is improved, but the article becomes bulkier and less conformable to the body shape
Solution Approach 1:
The absorbent core transitions from a flat two-dimensional structure to a three-dimensional basin shape through folding along predefined folding guides. This dimensional change allows the core to maintain high absorption capacity while achieving better conformability to the body's contours, resolving the contradiction between quantity of absorbent material and shape adaptability
Solution Approach 2:
The absorbent core is divided into multiple segments including a central portion, first and second side portions, and winglets separated by folding guides. This segmentation enables the core to fold into a three-dimensional basin configuration that conforms to the body shape while maintaining sufficient absorption capacity through the distributed absorbent material in each segment
2Reliability
If elastic waist bands and barrier leg cuffs are added to maintain contact and prevent leakage, then leakage resistance is improved, but device complexity and production cost increase
Solution Approach 1:
The absorbent core is designed with curved folding guides that guide the formation of a three-dimensional basin shape with smooth curved surfaces. This curvature allows the core to naturally conform to the body's contours and maintain contact along the thighs through its own geometry, reducing the need for additional elastic components and simplifying the overall structure while maintaining leakage prevention
3Shape
If the absorbent core is made thinner to reduce bulk, then conformability is improved, but absorption capacity decreases
Solution Approach 1:
The absorbent core utilizes three-dimensional folding to create vertical depth and volume within a thin profile. The basin configuration allows absorbent material to be distributed in a volumetric arrangement rather than a flat layer, maintaining high absorption capacity while keeping the overall article thickness reduced and conformable to the body
4Ease of operation
If the article is designed to spontaneously fold into a basin shape, then ease of application is improved, but manufacturing precision requirements increase
Solution Approach 1:
Folding guides are pre-formed and pre-positioned within the absorbent core during manufacturing, creating predetermined fold lines that guide the spontaneous folding action. This preliminary structuring ensures that the core folds into the correct three-dimensional basin shape during application, achieving ease of use while maintaining consistent manufacturing precision through the pre-established folding geometry
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 the fit and reduces leakage by maintaining contact with the thighs, improving comfort and fluid handling, while allowing for a thinner, more conformable structure that adapts to the body shape and is easy to apply symmetrically.
Implementation Method 1
The absorbent article may advantageously comprise at least one elasticized element that helps the absorbent core and article to spontaneously fold along the folding guides and thus form the basin shape when the article is placed on the wearer
Implementation Method 2
Modern diapers typically comprise an absorbent core containing a mixture of cellulose fibers and superabsorbent polymer ('SAP') particles as absorbent material
Data Source
AI summary
An absorbent article such as a diaper comprises a topsheet, a backsheet and an absorbent core. The absorbent layer comprises at least 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. Each side portion comprises a plurality of winglets, each winglet having a proximal side relative to a folding guide and extending outward from this proximal side, and wherein neighboring winglets are separated by a gap between their neighboring sides. 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 may comprise at least one liquid management layer substantially free of superabsorbent polymer between the topsheet and the absorbent core. The absorbent core may be substantially free of cellulose fibers.