Absorbent Article Protruding Sheet Pockets Fluid Diffusion
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Solution Overview
Problem
Existing absorbent articles face issues with inefficient fluid diffusion and unstable absorption due to freely moving absorption polymers, poor fluid diffusion properties between sheets, and polymer particle movement beyond restricting portions during high fluid absorption.
Innovation Solution
An absorbent article design featuring an upper layer sheet with protruding portions and intermittent joined portions along the circumferential direction, allowing for improved fluid diffusion and stable absorption by creating space for highly water-absorbing polymers, while restricting fluid diffusion in specific directions and preventing polymer leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If absorption polymer is allowed to freely move in the pocket, then the polymer can be positioned according to wearer posture, but the polymer may be in one side only and body fluid is not efficiently absorbed
Solution Approach 1:
The absorber is divided into multiple pockets arranged in the longitudinal direction, with each pocket containing absorption polymer. This segmentation ensures that fluid is distributed across multiple pockets rather than concentrating in one area, improving overall absorption efficiency while maintaining the ability of each pocket to adapt to fluid flow patterns.
Solution Approach 2:
Each pocket is designed with specific local characteristics to optimize fluid absorption in different regions. The pockets are arranged to cover different areas of the absorber, and each pocket's polymer can locally adapt to fluid flow while contributing to overall absorption efficiency.
2Stability of the object's composition
If polymer particles are joined between two sheets with hot-melt adhesives, then the polymer is fixed in position, but diffusion property of body fluid is poor and fluid is not efficiently absorbed
Solution Approach 1:
The hot-melt adhesive is extracted/removed from the structure. Instead of joining the sheets with adhesive, the pockets are formed by joining the upper and lower sheets at the periphery of each pocket, leaving the center of each pocket open to allow fluid diffusion. This extraction of the adhesive from the pocket interior restores fluid diffusion pathways while maintaining polymer position stability through the peripheral joining structure.
3Stability of the object's composition
If polymer particles are restricted by restricting portions, then polymer movement is limited, but when large amount of fluid is absorbed, polymer particles may move beyond the restricting portion and stable absorption amount is not maintained
Solution Approach 1:
The absorber is segmented into multiple pockets, each containing polymer particles. The pockets are separated by non-joined portions that allow fluid flow but contain the polymer within each pocket boundary. This segmentation provides both position control for the polymer and reliable absorption by distributing fluid across multiple pockets, preventing polymer from moving beyond restricting portions even during high absorption.
Solution Approach 2:
The restricting portions are arranged in a pattern that creates a three-dimensional confinement structure for the polymer particles within each pocket. This dimensional arrangement ensures that polymer particles are contained not only laterally but also vertically within the pocket structure, maintaining stable absorption even when large amounts of fluid are absorbed.
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
Enhances fluid diffusion properties and maintains a stable absorption amount by guiding fluids into adjacent spaces and restricting lateral diffusion, ensuring efficient absorption and preventing polymer loss.
Implementation Method 1
an absorber having a function of absorbing and retaining a body fluid
Implementation Method 2
diffusion property of the body fluid penetrating between the two sheets
Implementation Method 3
a hot-melt adhesive for fixing polymer particles is applied and a second joint region surrounding the first joint region in which a hot-melt adhesive for sealing is applied
Data Source
AI summary
An absorbent article, such as a sanitary napkin, a pantiliner or an incontinence pad, which improves diffusion property of a body fluid and maintains a stable absorption amount. In FIG. 3, a sanitary napkin (1) includes an absorber (4) including an upper layer sheet (10) disposed at a skin side, a lower layer sheet (11) disposed at a non-skin side, and a highly water-absorbing polymer (12) disposed between the upper layer sheet (10) and the lower layer sheet (11). The upper layer sheet (10) is provided with a plurality of protruding portions (14) bulging out to the skin side and forming space portions (13) to be filled with the highly water-absorbing polymer (12), and a joined portion (15) in which the upper layer sheet (10) and the lower layer sheet (11) are joined to each other intermittently on the peripheral edges of the protruding portions (14) along the circumferential directions.