Absorbent Core Basin Shape for Diaper Leakage
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Solution Overview
Problem
Modern absorbent articles, such as diapers, tend to sag and leak due to fluid weight, leading to poor fit and increased leakage, despite advancements like elastic waistbands and collapsible notches, as they fail to maintain effective dry and wet fit, comfort, and fluid handling while keeping production costs low.
Innovation Solution
An absorbent article with a three-dimensional basin-shaped absorbent core formed by folding guides and winglets, where triangular and constant-width gaps between winglets allow for flexibility and side wall formation, enhancing fit and reducing leakage by spontaneously folding into a basin shape when placed on a wearer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the absorbent core is made thinner by increasing SAP content, then the article becomes more cost-effective and comfortable, but the article sags more due to fluid weight
Solution Approach 1:
The absorbent core is transformed from a flat two-dimensional structure to a three-dimensional basin shape by folding side portions upward along folding guides. This dimensional change creates volumetric capacity while maintaining thin profile, allowing the core to conform to the curved body surface and prevent sagging through improved structural geometry rather than increasing material thickness
Solution Approach 2:
The absorbent core is divided into a central portion and two side portions separated by folding guides. This segmentation allows the side portions to be folded upward independently to form the basin shape, creating a structured configuration that maintains fit stability while keeping the overall core thin and cost-effective
2Reliability
If elastic waistbands and barrier leg cuffs are added to maintain contact and fit, then leakage is reduced, but production cost increases
Solution Approach 1:
Instead of adding elastic components in the horizontal plane, the invention creates three-dimensional basin shape by folding side portions upward. This volumetric configuration naturally contains fluid and maintains contact with the body through geometry alone, preventing leakage without requiring additional elastic waistbands or barrier leg cuffs
Solution Approach 2:
The invention extracts the leak prevention function from separate elastic components and integrates it into the basic absorbent core structure itself. The basin shape formed by folding the core provides inherent fluid containment, eliminating the need for additional leak-prevention components and reducing production costs
3Ease of operation
If the absorbent core is made thinner, then wearing comfort is improved, but dry and wet fit deteriorates
Solution Approach 1:
The invention resolves the conflict between thinness and fit by creating a three-dimensional basin shape from a thin absorbent core. The folded side portions form vertical walls that conform to the body's curvature, providing excellent dry and wet fit while maintaining the comfort benefits of a thin profile. The basin geometry enables the thin core to achieve both comfort and fit simultaneously
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 improved dry and wet fit, reduced leakage, and enhanced comfort by forming a stable basin shape that conforms to the body, effectively managing fluid absorption and distribution while maintaining a thin, cost-effective design.
Implementation Method 1
an absorbent core that forms a three-dimensional basin when folded... an absorbent article with a three-dimensional basin-shaped absorbent core formed by folding guides and winglets... effectively managing fluid absorption and distribution
Implementation Method 2
The absorbent article may advantageously comprise at least one elasticized portion that contracts when the article is not stretched flat, so that the absorbent core spontaneously folds along the folding guides and thus form the basin shape when the article is placed on the wearer
Data Source
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AI summary
An absorbent article (20) such as a diaper comprises a topsheet (24), a backsheet (25) and an absorbent core (28). The absorbent layer comprises at least a longitudinally-extending central portion (60), and a first and second side portions (61, 62) disposed transversally outward of the central portion. The absorbent core further comprises first and second folding guides (261, 262) between the central portion and the side portions. Each side portion comprises a plurality of winglets (610-613, 620-623), each winglet having a proximal side (6200, 6210, 6220) 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 (6202-6211, 6213-6221). The gaps between the winglets comprise at least one gap which has a substantially constant width and at least one gap which has a generally triangular shape. 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 (52, 54) substantially free of superabsorbent polymer between the topsheet and the absorbent core. The absorbent core may be substantially free of cellulose fibers.