Disposable Diaper Absorber Slit and Concave Elastic Design
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Solution Overview
Problem
Disposable diapers face issues with the absorber deforming in a way that affects the waist side, leading to poor fit and increased risk of leakage due to contraction forces between the legs, which are not effectively addressed by existing solutions.
Innovation Solution
A disposable diaper design featuring a width-direction slit in the absorber with concave portions that narrow towards the waist side, combined with concave portion deformation elastic members that contract to close the slit edges, allowing independent deformation of the waist side and improved fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If elastic members are used to tighten the diaper to the wearer's body, then the fit is improved, but the absorber is forcibly deformed and produces unnecessary folds and gaps causing leakage
Solution Approach 1:
The absorber is divided into multiple independent sections by introducing slits, allowing each section to deform independently without creating folds or gaps that cause leakage
2Adaptability or versatility
If the absorber is narrowed along the legs to improve crotch fit, then the crotch portion fit is improved, but the waist side deformation is not effectively addressed
Solution Approach 1:
Different regions of the absorber are given different properties: the crotch portion is narrowed for leg fit while the waist side maintains width and is equipped with elastic members for independent deformation along the body surface
3Ease of manufacture
If the absorber is made flat for manufacturing simplicity, then manufacturing is easier, but the absorber cannot be rounded along the body surface causing poor fit
Solution Approach 1:
The absorber transitions from a static flat shape to a dynamic rounded shape through elastic deformation enabled by slits and elastic members, allowing it to adapt to the body's contours while maintaining manufacturing simplicity
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 minimizes the influence of crotch portion deformation on the waist side, enabling a more favorable fit, reducing leakage, and enhancing the overall wearing experience by allowing the absorber to be rounded along the body surface.
Implementation Method 1
concave portion deformation elastic members that exert a contraction force in a direction in which the width-direction both side edges of the concave portion are closer to each other, and by contraction force of the concave portion deformation elastic members, the waist-side portion of the width-direction slit in the absorber is deformed
Data Source
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AI summary
The present invention is intended to make the deformation of the absorber at the crotch portion less prone to influence the waist side of the absorber and allow the waist side of the absorber to be easily rounded along the surface of the wearer's body. The foregoing issue is solved by a disposable diaper including an absorber (13) in a crotch portion, a ventral-side portion, and a dorsal-side portion, wherein the absorber (13) is divided in a front-back direction by width-direction slits (13S) continuing in the width direction provided on both front and back sides of the crotch portion, and concave portions (17u) (19u) recessed toward the waist side are formed in width-direction centers of waist-side edges of the width-direction slits (13S).