Disposable Diaper Deformation Restraining Unit for Absorption
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Solution Overview
Problem
Disposable diapers with absorbent polymers face challenges in effectively absorbing body fluids due to deformation of the urination region, which leads to wrinkles and reduced absorption capacity, especially when compressed by the wearer's legs.
Innovation Solution
Incorporating a deformation restraining unit in the urination region to prevent deformation propagation to the absorbent sheet, combined with a structured absorber design featuring a central aperture and side slits that guide fluid to a high-absorption area, enhancing absorption efficiency and reducing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a large amount of super absorbent material is arranged in the front absorbent region, then absorption performance in the front region is improved, but the body fluid excreted in the center urination region cannot be absorbed effectively
Solution Approach 1:
The absorbent structure is divided into multiple regions with different functions: the front absorbent region contains super absorbent material for absorbing body fluid, while the urination region in the center is designed to receive and guide body fluid excreted by the wearer. This segmentation allows each region to perform its specific function effectively, resolving the contradiction between having absorption material in the front region and effectively absorbing fluid excreted in the center region.
Solution Approach 2:
The absorbent layer acts as an intermediary structure connecting the front absorbent region and the urination region. It allows body fluid to be guided from the urination region to the front absorbent region where the super absorbent material is located, ensuring that fluid excreted in the center can be effectively absorbed by the material in the front region.
2Ease of manufacture
If the absorbent structure is made rectangular with equal length in widthwise direction for both urination region and front absorbent region, then manufacturing is simplified, but wrinkles are formed when the urination region is compressed by the wearer's legs
Solution Approach 1:
The absorbent structure is designed with asymmetric dimensions where the length of the urination region in the widthwise direction is made shorter than the length of the front absorbent region. This asymmetric design prevents wrinkle formation in the urination region when compressed by the wearer's legs, while still maintaining ease of manufacture by keeping the overall structure relatively simple and regular.
3Adaptability or versatility
If wrinkles are formed in the urination region and propagated to the front absorbent region, then the structure remains flexible, but the absorption capability of the super absorbent material cannot be exhibited sufficiently
Solution Approach 1:
By making the urination region shorter in the widthwise direction compared to the front absorbent region, the design prevents wrinkle propagation to the front absorbent region. This asymmetric dimensioning ensures that the super absorbent material in the front region maintains its absorption capability while the urination region can still accommodate compression from the wearer's legs.
Solution Approach 2:
The front absorbent region is given different dimensional characteristics compared to the urination region, with a longer widthwise length to prevent wrinkle formation. This local quality differentiation ensures that the absorption-capable region maintains its functional properties while the urination region adapts to body contours.
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
Improves absorption performance by maintaining the absorbent polymer's effectiveness, reducing wrinkles, and enhancing the overall absorption capacity of the disposable diaper, while providing a comfortable wearing experience.
Implementation Method 1
an absorbent polymer that absorbs body fluid
Implementation Method 2
absorbent structure that includes an absorbent layer... absorbent panel laminated at the front end
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A disposable wearing article 1 includes a urination region S3 which is a region in contact with a urination portion of the wearer, a rear waistline region S2 which is arranged to the rear of the urination region and is a region in contact with buttocks of the wearer, and a front waistline region S1 which is arranged to the front of the urination region and is a region in contact with the ventral of the wearer. An absorbent sheet 90 having an absorbent polymer arranged between liquid-permeable sheets is provided in at least one of the buttocks region and the ventral region. An absorbent polymer arranged region including absorbent polymer is arranged in in at least one of the front waistline region and the rear waistline region. A deformation restraining unit is formed to be capable of restraining deformation of the urination region from being propagated to an absorbent polymer arranged region in the inner side in the front-back direction with respect to the inner end in the front-back direction of the absorbent polymer arranged region.