Folded Leg Cuff Design for Absorbent Article Leakage Control
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Solution Overview
Problem
Current absorbent articles, such as diapers, face challenges in providing effective leakage protection, especially when dealing with fecal material, which can leak out of gaps between the article and the wearer's legs and/or waist. This leads to soiling and contamination of clothing and other items.
Innovation Solution
The development of a disposable absorbent article featuring a leg gasketing system with a folded outer cuff design and at least one waist gasketing element. The leg gasketing system includes an inner and outer cuff with folded edges, and the waist gasketing element is attached to both the chassis and the leg gasketing system, providing enhanced containment and leakage protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymeric film layer is used for the outer cuff to prevent adhesive bleedthrough and provide high opacity, then leakage protection and manufacturing reliability are improved, but the article develops a plastic-like appearance and produces noise during application
Solution Approach 1:
The patent removes the polymeric film layer from the outer cuff structure, extracting the problematic element that caused the plastic-like appearance and noise while maintaining the essential functions through alternative means (elastically expandable material and elastic strands)
Solution Approach 2:
The patent uses a composite structure combining an elastically expandable material with elastic strands to achieve both functional requirements (leakage protection, fit control) and aesthetic appearance without relying on a polymeric film layer
2Ease of manufacture
If outer leg elastic strands are spaced inboard from the longitudinal edge to prevent cutting exposure, then manufacturing safety is improved, but the edge control capability diminishes and gather distribution becomes random
Solution Approach 1:
The patent introduces a longitudinal dimension to the elastic strand arrangement by providing at least one longitudinally extending elastic strand that contacts the longitudinal edge, adding edge control capability in the longitudinal direction while maintaining manufacturing safety through the inboard spacing of other strands
3Device complexity
If only two to three outer leg elastics per side are used to create gathers, then device complexity is reduced, but achieving the desired appearance of a wide finished leg cuff becomes difficult
Solution Approach 1:
The patent employs an elastically expandable material that dynamically adapts to the leg shape, allowing a simpler elastic strand configuration to achieve the desired wide finished leg cuff appearance through elastic expansion rather than relying on multiple closely-spaced strands
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 described design achieves a Blowout Percent Leakage of less than about 9.0% when tested, indicating improved leakage protection and containment of bodily extrudates, thereby reducing the risk of soiling and enhancing user comfort.
Implementation Method 1
The outer cuff contains the outer leg elastic strands, which create the contraction forces and gathers
Implementation Method 2
The barrier leg cuff may be made using a hydrophobic nonwoven and may be disposed on the body-facing surface of the absorbent article
Implementation Method 3
The elastic strands in the leg cuffs are typically joined with molten adhesive during manufacture
Data Source
AI summary
A disposable absorbent article may include a chassis that includes a topsheet, a backsheet, and an absorbent core disposed between the topsheet and the backsheet; and a leg gasketing system and a waist gasketing element. The leg gasketing system may include an inner cuff and an outer cuff; the inner cuff may include an inner cuff folded edge and an inner cuff material edge and the outer cuff may include an outer cuff material edge such that the web of material is folded outward to form the inner cuff folded edge. When tested by the Blowout Method Test as described herein, the disposable absorbent article has a Blowout Percent Leakage of less than about 9.0%.