Absorbent Body Fold-Inducing Bands for Diaper Shape Stability
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Solution Overview
Problem
Disposable diapers with slits in the absorbent body experience high deformation when worn, leading to undesirable shape changes, especially during prolonged use or intense movement, which can result in leakage and loss of softness.
Innovation Solution
Incorporating fold-inducing bands with low basis weight and super-absorbent polymer content, and forming high-density compression grooves in these bands, positioned near the absorbent body side edges, to guide the absorbent body into a specific shape and prevent collapse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slits are provided in the absorbent body to improve fitting property and leakproofness, then the outer appearance becomes smooth and fitting property improves, but the absorbent body undergoes undesirable deformation and shape collapse occurs
Solution Approach 1:
The absorbent body is segmented into different regions with different basis weights: high basis weight regions for structural support and low basis weight regions (fold-inducing bands) for controlled deformation. This segmentation allows different parts to perform different functions - maintaining shape where needed and allowing folding where desired.
Solution Approach 2:
Different regions of the absorbent body are given different local properties through varying basis weight. The fold-inducing bands have lower basis weight to facilitate controlled folding, while other regions maintain higher basis weight for structural integrity. This local quality differentiation resolves the contradiction between overall shape stability and localized deformability.
2Stability of the object's composition
If density is increased by excessive pressing of the absorbent body to prevent collapse, then shape stability improves, but the softness of the diaper is lost
Solution Approach 1:
The absorbent body is divided into regions with different pressing densities. Only specific areas requiring shape stability are heavily pressed, while other areas remain softer and more compliant. This selective segmentation maintains overall shape stability without uniformly sacrificing softness.
Solution Approach 2:
Different regions of the absorbent body have different local density characteristics. High density regions provide structural support and shape stability, while low density regions maintain softness and comfort. This local quality variation resolves the contradiction between shape stability and softness.
3Adaptability or versatility
If fold-inducing bands with low basis weight are provided to enable easy deformation, then the absorbent body can deform to intended shape, but the risk of shape collapse increases
Solution Approach 1:
The absorbent body is segmented into fold-inducing bands with low basis weight for deformation and other regions with higher basis weight for stability. This segmentation allows the structure to deform in controlled areas while maintaining stability in support areas.
Solution Approach 2:
Different regions have different local basis weight properties: low basis weight in fold-inducing bands for adaptability and higher basis weight in other regions for stability. This local quality differentiation enables the absorbent body to simultaneously achieve deformation capability and shape stability.
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 absorbent body easily deforms to the intended shape, preventing collapse and maintaining softness while ensuring resistance to leakage, resulting in improved fitting and leakproofness.
Implementation Method 1
the fold-inducing bands including hydrophilic fibers and a super-absorbent polymer
Implementation Method 2
the compression groove having higher density than the other sections of the absorbent body
Data Source
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AI summary
Provided is a disposable diaper that readily deforms to the intended shape of an absorbent body, and that can prevent the absorbent body from losing shape during use. The absorbent body is provided with a left and right pair of fold-inducing bands (8) that extend forward and backward from the crotch area center, the distance in the width direction between the left and right pair of fold-inducing bands being greater at the front edge and the back edge of the fold-inducing bands than in the crotch area center. The front edges and the back edges of the fold-inducing bands are positioned farther to the outside in the width direction than are the widthwise inside positions of joined areas (9) of a leak barrier and a top sheet. The fold-inducing bands include hydrophilic fibers and a highly absorbent polymer, but have lower basis weight and lower highly absorbent polymer content as compared with other regions of the absorbent body. Compression grooves (10) are provided within the fold-inducing bands, the compression grooves having higher density as compared with other regions of the absorbent body.