Absorbent Article With Variable Topsheet Projections
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Solution Overview
Problem
Existing absorbent articles face challenges in reliably preventing liquid leakage, as conventional techniques such as slits in absorbent members and topsheet projections do not effectively manage excrement diffusion and leakage.
Innovation Solution
The absorbent article features a projecting-and-depressed structure on the skin-facing surface, with low-basis-weight portions in the absorbent core and varying-sized projections on the topsheet, where projections of different sizes overlap with low-basis-weight portions to guide and retain excrement, preventing leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional slits or single-size projections are used in absorbent articles, then the structure is simple, but liquid leakage cannot be reliably prevented
Solution Approach 1:
The absorbent core is segmented into multiple low-basis-weight portions extending in one direction, creating distinct regions that guide and contain excrement. This segmentation allows the structure to reliably prevent leakage by directing flow into specific containment zones rather than relying on a single complex mechanism.
Solution Approach 2:
The topsheet incorporates projections of different sizes at different locations, with larger projections in central regions and smaller projections in side regions. This local differentiation optimizes excrement containment at each specific location, improving overall leakage prevention reliability without requiring a uniformly complex structure throughout.
2Reliability
If multiple low-basis-weight portions are added to guide excrement, then excrement containment improves, but the absorbent core becomes more complex
Solution Approach 1:
The absorbent core utilizes parameter changes in basis weight to create functional regions. By varying the basis weight parameter to create low-basis-weight portions, the structure guides excrement flow and improves containment reliability without adding complex mechanical components or structural elements.
3Reliability
If projections of different sizes are used in the topsheet, then excrement diffusion is improved, but manufacturing precision requirements increase
Solution Approach 1:
The projections are segmented into different size categories (larger central projections and smaller side projections) that correspond to different functional regions. This segmentation approach to sizing actually simplifies manufacturing by using discrete size categories rather than requiring precise control of continuous size variations, as each category can be produced with standard tolerances.
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 configuration effectively induces excrement into low-basis-weight portions and prevents leakage by utilizing gentle and steep slopes in the projections, ensuring reliable containment of excrement within the absorbent core.
Implementation Method 1
the absorbent core includes one or a plurality of low-basis-weight portions extending in one direction and having a relatively lower basis weight than other parts of the absorbent core
Implementation Method 2
The absorbent article effectively induces excrement into low-basis-weight portions and prevents leakage by utilizing gentle and steep slopes in the projections
Implementation Method 3
utilizing gentle and steep slopes in the projections, ensuring reliable containment of excrement within the absorbent core
Data Source
AI summary
An absorbent article of the present invention includes an absorbent core (4) and a topsheet (2) disposed on a skin-facing surface of the absorbent core (4) and having a projecting-and-depressed structure on the skin-facing surface. The absorbent core (4) includes one or a plurality of low-basis-weight portions (41) extending in one direction and having a relatively lower basis weight than other parts of the absorbent core (4). In a plan view, the topsheet (2) includes a plurality of types of projections (24) having different sizes in an overlapping region with the low-basis-weight portions (41).