Leak-proof Wall Joining for Absorbent Article Sagging
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Solution Overview
Problem
Disposable diapers with leak-proof cuffs face issues where the absorbent core's weight causes sagging, leading to gaps between the cuff and the wearer's body, potentially resulting in excrement leakage.
Innovation Solution
An absorbent article design featuring leak-proof walls with elastic members and non-skin-side portions that are joined at specific points, overlapping with stomach-side or back-side members to maintain a flat shape and prevent gaps, even when the absorbent core becomes heavier.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the absorbent core absorbs excrement, then the absorption function is improved, but the main body becomes heavier and sags downward causing gaps to form
Solution Approach 1:
The leak-proof wall is divided into multiple portions: a first portion that contacts the wearer's body, a second portion that is joined to the first portion, and a third portion that extends upward. This segmentation allows each portion to perform its specific function while maintaining overall structural integrity and flatness during absorption.
Solution Approach 2:
The skin-side portion and non-skin-side portion of the leak-proof wall are joined together at specific joining portions to form a flat-shaped structure. This merging creates a rigid enough structure to maintain flatness and prevent gaps, while the non-joining portions allow flexibility for absorption.
2Shape
If the leak-proof wall is made rigid to maintain flat shape, then gap formation is reduced, but flexibility and comfort are compromised
Solution Approach 1:
Different portions of the leak-proof wall have different properties: joined portions provide rigidity and flatness where needed for leak prevention, while non-joining portions provide flexibility and conformability for comfort. The elastic members provide localized elasticity in specific regions.
Solution Approach 2:
The leak-proof wall transitions from a completely flexible state to a partially rigid state through selective joining. The joined portions maintain flatness dynamically during absorption, while non-joined portions dynamically conform to body movements and shapes.
3Reliability
If the leak-proof wall is extended upward to prevent leakage, then leak-proof performance is improved, but the structure becomes more complex and prone to sagging
Solution Approach 1:
The leak-proof wall is segmented into functional portions with the joining portions positioned inward from the leading ends. This segmentation simplifies the overall structure by clearly defining the roles of each portion while maintaining effective leak prevention.
Solution Approach 2:
The leak-proof wall utilizes the thickness dimension by joining skin-side and non-skin-side portions together, creating a three-dimensional flat-shaped structure that maintains contact with the wearer's body without requiring excessive extension in the width direction.
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 effectively reduces the risk of excrement leakage by maintaining a flat contact with the wearer's body, suppressing gap formation between the absorbent article and the wearer, even when the absorbent core absorbs excrement and becomes heavier.
Implementation Method 1
a skin-side portion that includes a plurality of elastic members
Data Source
AI summary
An absorbent article includes an absorbent main body; a stomach-side member at an end portion on one side of the absorbent main body; and a back-side member at an end portion on another side. The absorbent main body has a pair of leak-proof walls in respective side end portions. Each of the leak-proof walls has a skin-side portion that includes a plurality of elastic members and a non-skin-side portion. The pair of leak-proof walls each have a joining portion in which mutually opposing surfaces of the skin-side portion and the non-skin-side portion are joined, and a non-joining portion above the joining portion. The mutually opposing surfaces are not joined in the non-joining portion. The joining portions are inward, with respect to the width direction, of leading ends of the leak-proof walls. Each of the joining portions is overlapped with the stomach-side member or the back-side member in an up-down direction.