Absorbent Core Concavity and Segmented Leak-Proof Walls
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Solution Overview
Problem
Conventional pull-on disposable diapers face issues where the absorbent core droops due to weight gain from excrement, leading to a space in the crotch area and potential leakage, as the leak-proof walls deviate in position, causing discomfort and inadequate containment.
Innovation Solution
The absorbent article features an absorbent core with a concave portion and stretchable leak-proof walls with joining and non-joining parts, where the leak-proof walls are designed to fit flat against the body, reducing drooping and maintaining position, and include elastic members that provide a stretching force to prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If leak-proof walls are tightened to suppress space formation in crotch part, then leakage prevention is improved, but wearer comfort deteriorates
Solution Approach 1:
The leak-proof walls have different structural properties in different regions: the first region (near crotch) has joined portions that maintain flat contact to prevent space formation, while the second region (away from crotch) has non-joined portions that provide flexibility and comfort. This local differentiation allows the structure to simultaneously achieve leakage prevention where needed and comfort where tolerable.
2Quantity of substance
If absorbent core absorbs excrement increasing weight, then absorption function is improved, but drooping increases causing space formation and leakage
Solution Approach 1:
The absorbent core includes a concave portion in its cross-sectional shape that corresponds to the wearer's anatomy. This curved configuration allows the core to maintain better contact with the body even when weighted down by absorbed excrement, preventing drooping and space formation while preserving full absorption capacity.
Solution Approach 2:
The leak-proof walls function as flexible barriers that adapt to the absorbent core's shape changes. The joined portions in the first region provide structural support to prevent drooping, while the non-joined portions in the second region allow flexibility to accommodate the weighted core without causing discomfort or leakage.
3Stability of the object's composition
If leak-proof walls are made flat against body, then position stability is improved, but flexibility and comfort are reduced
Solution Approach 1:
The leak-proof walls are segmented into different functional regions: a first region with joined portions that provide flat, stable contact near the crotch to prevent leakage, and a second region with non-joined portions that provide flexibility and adaptability away from the crotch. This segmentation allows each region to optimize its performance for its specific location.
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 suppresses the formation of a space in the crotch area, reduces discomfort, and enhances the fit of the absorbent article by maintaining the position of the leak-proof walls and preventing excessive drooping of the absorbent core.
Implementation Method 1
leak-proof walls in a pair respectively provided on both sides in the lateral direction of the absorbent main body, the leak-proof walls including elastic members that are stretchable in the longitudinal direction
Data Source
Figure 1
Figure 2
Figure 3A~3C
AI summary
Included are: an absorbent main body (10) including an absorbent core (11); and leak-proof walls (50) in a pair that have elastic members (55) stretchable in a longitudinal direction and are provided on both sides in a lateral direction of the absorbent main body (10), the absorbent core (11) including a concave portion (11c) that is concave inward in the lateral direction in the central portion in the longitudinal direction, the leak-proof walls (50) each including a joining part (61) where portions of a surface of each of the leak-proof walls (50) are joined to each other on one side in a thickness direction, in at least a part of a region corresponding to the concave portion (11c) in the longitudinal direction , he leak-proof walls (50) each including a non-joining part (62) in at least one of a region on one end side and a region on the other end side in the longitudinal direction with respect to the joining part (61)), the non-joining part (62) being where portions of a surface of each of the leak-proof walls are not joined to each other on the one side in a thickness direction.