Disposable Diaper Slit Layout for Deformation and Leak Control
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Solution Overview
Problem
Existing disposable diapers fail to adequately suppress deformation of the absorbent body in the ventral, crotch, and dorsal regions during wear, leading to discomfort and potential leakage.
Innovation Solution
A disposable diaper design featuring a liquid-permeable top sheet, liquid-impermeable under sheet, and an absorbent body with specific slit configurations and elastic members to stabilize the absorbent body, including oblique and straight parts, and slits in the crotch and dorsal sections to minimize deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If slits are provided in the absorbent body to alleviate discomfort, then wearer comfort is improved, but deformation suppression in the dorsal region is insufficient
Solution Approach 1:
The absorbent body is divided into multiple functional sections (ventral section, crotch section with front/back/middle areas, and dorsal section), each equipped with specifically configured slits. This segmentation allows different regions to address different needs: ventral/crotch slits for comfort and mobility, while dorsal slits for deformation suppression.
Solution Approach 2:
Different slit configurations are applied to different regions of the absorbent body. The dorsal section receives crossing slits with specific orientation parallel to second oblique parts, while the ventral and crotch regions have slits configured for comfort. This local differentiation ensures each region performs its specific function optimally.
2Stability of the object's composition
If slits are configured to suppress large deformation in the crotch region, then deformation control is improved, but discomfort alleviation is insufficient
Solution Approach 1:
The crotch section is further segmented into front area, middle area, and back area, each with distinct slit configurations. The front area has slits parallel to first oblique parts for comfort, the middle area has a central slit for deformation control, and the back area has slits parallel to second oblique parts, creating a comprehensive solution that addresses both comfort and stability.
Solution Approach 2:
The slit configurations exhibit asymmetric distribution across the crotch section. Slits in the front area are positioned differently from those in the back area, with specific orientations relative to the oblique parts of side edges. This asymmetric arrangement allows optimal performance for both comfort and deformation control in different crotch regions.
3Reliability
If multiple slits are provided across different regions, then both comfort and deformation suppression are improved, but device complexity increases
Solution Approach 1:
The slit structure serves multiple functions simultaneously: it provides wearer comfort by accommodating movement, suppresses deformation in all regions (ventral, crotch, and dorsal), and maintains absorbent body integrity. This multi-functionality is achieved through a unified slit design philosophy applied across different regions with specific local variations.
Solution Approach 2:
Instead of adding complex mechanical structures to suppress deformation, the invention uses slits (openings) which traditionally might be seen as weakening the structure. By strategically configuring these slits, the invention achieves deformation suppression while maintaining simplicity, inverting the conventional approach of adding material or structure to prevent deformation.
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 design effectively suppresses absorbent body deformation, alleviates wearer discomfort, and prevents leakage by narrowing the slits to maintain fit and stability during movement.
Implementation Method 1
an elastic member stretchable in its width direction is provided on a surface of the absorbent body opposite to another surface facing the body of a wearer, in at least one of positions facing to the first slits, the second slits, the third slits, and the fourth slits
Data Source
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AI summary
In a disposable diaper whose deformation while the wearer is walking, is suppressed to alleviate discomfort, first slits extend from ventral section to the front of crotch section in their side portions at a distance from and in parallel to first oblique parts, a second slit extends in parallel to straight parts, in the central part in the width direction of middle area of the crotch section, third slits extend at a distance from second oblique parts in the back of the crotch section in its side portions, with the back end of each third slit located outwards of its front end, fourth slits extend crossing each other in parallel to the second oblique parts, in the middle area of dorsal section, back ends of the first slits are located inwards of the straight parts, and front ends of the fourth slits are at a longitudinal distance from the back ends of the third slits.