Tufted Absorbent Topsheet for Fluid and Comfort Tradeoff
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Solution Overview
Problem
Conventional absorbent articles have a uniform topsheet that fails to provide different benefits in various portions, leading to a tradeoff between fluid acquisition/retention performance and comfort, particularly in the crotch region where curved features require distinct surface textures for effective fluid management and skin comfort.
Innovation Solution
A tufted topsheet design with varying tuft heights and area densities, where tuft region lateral boundaries are strategically positioned to differentiate between fluid collection and skin comfort zones, featuring looped fibers that extend from a fibrous nonwoven web, providing distinct benefits across the absorbent article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform topsheet is used to reduce manufacturing costs, then manufacturing cost is reduced, but fluid acquisition/retention performance and comfort cannot be optimized for different body regions
Solution Approach 1:
The topsheet is designed with spatially varying tuft characteristics where the center portion has higher tuft density and shorter tufts for fluid acquisition, while peripheral portions have lower tuft density and longer tufts for comfort and chafing reduction. This local differentiation allows each region to perform its specific function optimally without requiring a completely separate topsheet for each zone.
Solution Approach 2:
The topsheet is segmented into distinct functional zones (center fluid acquisition zone and peripheral comfort zone) with different tuft configurations. This segmentation enables independent optimization of each zone's characteristics while maintaining a single integrated topsheet structure that can be manufactured as one piece.
2Productivity
If a topsheet with high fluid acquisition rate is used in the center portion, then fluid acquisition performance is improved, but the topsheet may cause sticky sensation and discomfort against the wearer's skin
Solution Approach 1:
The center portion of the topsheet features higher tuft density with shorter tufts that effectively capture and transfer fluid to the absorbent core, while the peripheral portions have lower tuft density with longer tufts that provide a softer, less sticky feel against the wearer's skin. This local quality differentiation resolves the contradiction between fluid acquisition and comfort.
3Device complexity
If a uniform surface texture is used on the topsheet, then manufacturing simplicity is maintained, but different body regions cannot receive region-specific benefits for fluid management and comfort
Solution Approach 1:
The topsheet incorporates spatially varying tuft characteristics with the center portion having higher tuft density and shorter tufts for fluid acquisition, while peripheral portions have lower tuft density and longer tufts for comfort. This local quality approach provides region-specific benefits while maintaining relative manufacturing simplicity through a single topsheet structure.
4Reliability
If peripheral portions of the topsheet have high tuft density for fluid acquisition, then fluid retention is improved, but chafing increases as the wearer moves
Solution Approach 1:
The peripheral portions of the topsheet are designed with lower tuft density and longer tufts that provide a softer, more compliant surface that reduces chafing during movement, while still maintaining sufficient fluid acquisition capability. This local quality differentiation resolves the contradiction between fluid retention and chafing prevention.
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 tufted topsheet design enhances fluid acquisition and retention while ensuring comfort by varying tuft heights and densities, accommodating the curved anatomy of the crotch region, thereby improving the overall performance and user experience of absorbent articles.
Implementation Method 1
The first tufts and the second tufts comprise fibers integral with and extending from the fibrous nonwoven web. A plurality of the fibers of the first tufts and second tufts are looped fibers.
Data Source
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AI summary
An absorbent article having a topsheet in facing relationship with an absorbent core. The topsheet has a pair of tuft region lateral boundaries. Each tuft region lateral boundary is defined by a line or a portion of a line separating a plurality of first tufts from a plurality of second tufts, first tufts and second tufts differing in either height or area density. The tuft region lateral boundaries are on opposing sides of the longitudinal centerline. The tuft region lateral boundaries extend longitudinally along transversely opposite sides of the topsheet and are spaced apart from each other by a distance gradually increasing or gradually decreasing from a minimum or maximum, respectively, at a parallel transverse axis towards longitudinally opposing ends of the tuft region lateral boundaries. The tufts have fibers integral with and extending from the fibrous nonwoven web.