Quadrilateral Leg Cuff Geometry for Absorbent Article Leakage
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Solution Overview
Problem
Existing absorbent articles for urinary incontinence face challenges in effectively preventing side leakage due to the dominance of underwear elastic over the absorbent article's elastic, and designs that create harsh edges or bunching issues, leading to ineffective fluid containment and discomfort.
Innovation Solution
The absorbent article features leg cuffs with a quadrilateral cross-sectional geometry that lifts upon elastic contraction, forming a gasketing effect to direct bodily fluids inward and prevent side leakage, while maintaining comfort and avoiding distortion that could block the fluid path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gathered elastic members are placed along the side margins to create edge barriers, then side leakage protection is improved, but the underwear elastic dominates the absorbent article elastic making it ineffective
Solution Approach 1:
The leg cuff is designed with a three-dimensional quadrilateral cross-sectional geometry that lifts to create a standing barrier, transitioning from a two-dimensional gathered elastic to a volumetric structure. This dimensional change allows the cuff to maintain its shape and elastic effectiveness independently of the underwear elastic.
Solution Approach 2:
The leg cuff is segmented into distinct walls (inner wall, outer wall, front wall, rear wall) formed by bonded lines, creating a structured quadrilateral cross-section. This segmentation allows each wall to function independently in containing fluid while maintaining overall structural integrity.
2Reliability
If gathered elastic members are used to create standing barriers along the side surface edges, then fluid containment is improved, but bunching of absorbent material pushes material into the fluid path blocking the absorbent core
Solution Approach 1:
The leg cuff walls are formed as flexible thin structures with controlled thickness, allowing them to lift and maintain a standing barrier position without excessive bulk. The thin-walled quadrilateral structure prevents material bunching while maintaining fluid containment effectiveness.
3Reliability
If gathered elastic members create standing barriers, then side leakage prevention is improved, but the elastics create a harsh edge that rubs against the wearer causing discomfort
Solution Approach 1:
The leg cuff corners are designed with rounded curvatures rather than sharp angles, creating a smoother profile that reduces rubbing against the wearer's skin. The curved transitions between walls eliminate harsh edges while maintaining the standing barrier function for side leakage prevention.
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 provides improved side leakage protection and comfort by creating a raised edge barrier that keeps urine within the absorbent area, preventing distortion and ensuring effective fluid containment without harsh edges or bunching.
Implementation Method 1
elastic contraction within the leg cuff causes the leg cuff to lift and provide an improved absorbent article having raised side edges
Data Source
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AI summary
An absorbent article having improved leg cuffs. The absorbent article includes a topsheet, a backsheet joined to the topsheet; and an absorbent core positioned between the topsheet and the backsheet. The absorbent core can have longitudinal edges and end edges, and the absorbent article can have a leg cuff extending along each longitudinal edge of the absorbent core. The leg cuff can have a lifted position and a flat position, a height, a width, a length, a volume, an upper surface, an inner barrier, an outer barrier, a lower surface, and a cross-sectional area that is a generally quadrilateral shape in the lifted position. The cross-sectional area is defined by the upper surface, the inner barrier, the outer barrier, and the lower surface.