Profiled Elastic Belts for Absorbent Article Fit
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Solution Overview
Problem
Conventional absorbent articles tend to sag, gap, and slide down on the wearer due to dynamic motions and forces, leading to premature leakage and poor fit, as their anchoring systems fail to accommodate changing body dimensions and dynamic forces effectively.
Innovation Solution
The absorbent article features a front and rear belt with elastic strands extending along a transverse direction, with varying peak extension forces and zones to provide a sustained dynamic fit, anchored in the low motion zone to minimize sagging and sliding, using a center chassis with a liquid permeable topsheet and impermeable backsheet, and a leg gasketing system for improved containment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional anchoring systems with horizontal line of tension are used, then the article is secured to the wearer, but the article cannot accommodate changes in body dimension caused by wearer movement, leading to sliding and gapping
Solution Approach 1:
The patent applies dynamics by transitioning from a static horizontal line of tension to a dynamic angled line of tension that can adapt to body movements. The anchoring system is configured to move with the wearer's abdomen bulging and contracting, maintaining effective anchoring force while accommodating dimensional changes. This is achieved through strategic placement of elastic strands and belt zones that allow the anchoring line to pivot and adjust its angle relative to the body surface.
Solution Approach 2:
The patent changes the geometric parameters of the anchoring system by positioning the line of tension at an angle rather than horizontally. This angular configuration allows the same anchoring force to produce both vertical holding component and horizontal accommodating component. The elastic properties of the belt materials are also utilized to change the effective length and tension of the anchoring system dynamically as the body moves.
2Reliability
If high forces are applied in high motion zones to anchor the article, then the article is secured firmly, but skin red marking and restriction of freedom of movement occur
Solution Approach 1:
The patent applies local quality by differentiating the elastic properties and force distribution across different zones of the belt. The central belt zones have different elastic characteristics compared to peripheral zones, allowing high anchoring forces to be concentrated in specific low-motion areas while high-motion zones experience reduced forces. This zoned approach ensures effective anchoring without subjecting entire high-motion areas to excessive force.
Solution Approach 2:
The anchoring system is segmented into multiple elastic strands and belt zones rather than applying a single continuous high force. This segmentation allows the anchoring function to be distributed across multiple points, with each segment contributing to the overall holding force while individual segments experience reduced stress, preventing skin damage and movement restriction.
3Area of stationary object
If the absorbent article is designed to fit in zones subject to dynamic motion, then the article covers the necessary areas, but the dynamic forces push the article away from the body, causing sagging and gapping
Solution Approach 1:
The patent addresses the sagging problem by introducing a dimensional change in the anchoring geometry. Instead of relying solely on horizontal coverage, the angled line of tension creates a three-dimensional anchoring configuration that projects force vectors in multiple directions. This dimensional approach allows the article to maintain coverage in dynamic zones while the angled anchoring provides upward and inward forces to counteract sagging and gapping tendencies.
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 solution provides a better fit, reduced leakage, and enhanced wearer comfort by maintaining the absorbent article in place through the use of elastic belts and a center chassis, effectively addressing sagging and sliding issues during use.
Implementation Method 1
The front and rear belt each comprises elastic strands extending along a transverse direction and being disposed between a first and second belt layer
Data Source
AI summary
The disclosure relates to absorbent articles having a front belt and a rear belt, each comprising a central zone and first and second peripheral zones, the zones extending substantially in transverse direction of the absorbent article. The at least first belt provides improved fit in the low motion zone of a wearer while being able to adapt easily to the motion of the wearer outside the low motion zone.