Pant-Type Absorbent Article With Asymmetric Core for Nighttime Leakage
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Solution Overview
Problem
Disposable pant-type absorbent articles designed for nighttime use or for bedridden users face challenges with high leakage rates and skin irritation due to inadequate absorbency distribution and movement during sleep, requiring frequent changes and disrupting sleep patterns.
Innovation Solution
A pant-type absorbent article with a unique absorbent core design featuring a first absorbent layer with a higher concentration of superabsorbent polymer particles in the rear portion, channels to guide liquid to the central region, and a transfer layer positioned centrally or rearwardly to enhance absorbency and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the absorbent member uses a symmetric design with uniform distribution of absorbent materials, then the manufacturing process is simple, but the article cannot effectively handle nighttime liquid discharges and movement patterns
Solution Approach 1:
The absorbent member is designed with an asymmetric structure where the first absorbent layer is shorter than the second absorbent layer in the longitudinal direction. The first absorbent layer front edge is positioned at a greater distance from the absorbent member front edge compared to the distance of the first absorbent layer rear edge from the absorbent member rear edge. This asymmetric configuration adapts to nighttime movement patterns and liquid discharge characteristics, providing improved performance without requiring complete redesign of the entire article.
Solution Approach 2:
Different regions of the absorbent member are assigned different absorbent properties. The second absorbent layer extends beyond the first absorbent layer at the rear portion, creating zones with varying absorbency. This local differentiation allows the article to handle liquid discharges more effectively at specific regions while maintaining overall functional balance.
2Quantity of substance
If the absorbent member extends fully across the crotch portion with uniform coverage, then the absorbency capacity is maximized, but the front and rear elastics cannot provide proper fit and comfort
Solution Approach 1:
The absorbent member is segmented into a first absorbent layer and a second absorbent layer, where the first layer is shorter than the second layer. This segmentation creates distinct functional zones that allow the front and rear elastics to operate effectively in their respective regions while the second absorbent layer provides extended absorbency capacity in the crotch portion where liquid discharges are most likely to occur during nighttime.
3Duration of action of stationary object
If the article uses a single-layer absorbent structure, then the device complexity is reduced, but the article cannot maintain dryness over prolonged nighttime periods
Solution Approach 1:
The absorbent member employs a nested layer structure where the first absorbent layer is positioned within the longitudinal extent of the second absorbent layer. The first layer is shorter and positioned such that its front edge is at a greater distance from the absorbent member front edge compared to its rear edge distance from the absorbent member rear edge. This nested configuration allows multiple absorbent layers to work together, extending the duration of dryness throughout the night while maintaining a manageable structural complexity.
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 provides improved dryness and reduced leakage, ensuring a dryer topsheet over prolonged periods, enhancing user comfort and reducing skin irritation, particularly beneficial for nighttime use.
Implementation Method 1
Each of the first and the second absorbent layer comprises superabsorbent polymer particles. The first absorbent layer comprises a higher amount of superabsorbent polymer particles than the second absorbent layer.
Implementation Method 2
The absorbent member is in a crotch portion thereof provided with at least two channels extending in the longitudinal direction and on a respective side of a longitudinal centerline of the absorbent article.
Data Source
AI summary
Disclosed is an absorbent article including an absorbent member arranged between a topsheet and backsheet, the absorbent member having front edge and a rear edge, the absorbent member including a first layer having a first layer front edge and a first layer rear edge and a second layer, the first being shorter than the second layer, wherein the first and second layers include superabsorbent polymer particles, wherein the absorbent member is provided with at least two channels extending in a longitudinal direction and on a respective side of a longitudinal centerline of the absorbent article, the first layer including a higher amount of superabsorbent polymer particles than the second layer, the absorbent member having a total absorbent capacity of 1100 ml or more, wherein a ratio between the front edge distance and the rear edge distance is 1.5 or greater.