Launderable Outer Covers for Wearable Absorbent Articles
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Solution Overview
Problem
Reusable outer covers for wearable absorbent articles often shrink or lose elasticity during laundering, leading to poor fit, leakage, and discomfort due to changes in size and shape, which affects their performance and appearance.
Innovation Solution
Designing launderable and laundering-resistant outer covers with specific materials and constructions, such as soft and stretchable knit fabrics with Spandex, and tri-laminate structures, that maintain dimensional stability and elastic properties after multiple wash cycles, ensuring a comfortable and secure fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reusable outer covers are made with conventional materials, then they can be laundered, but they shrink and lose elasticity after laundering
Solution Approach 1:
The outer cover uses a composite structure with an elastomeric layer (providing elasticity) and a nonwoven layer (providing structure and durability). This combination allows the material to maintain both elastic properties and dimensional stability after repeated laundering cycles, resolving the contradiction between material flexibility and structural integrity.
Solution Approach 2:
The patent specifies particular ranges for elastomeric content (at least 20% by weight) and nonwoven content (at most 80% by weight) to optimize the balance between elasticity and dimensional stability. By controlling these compositional parameters, the outer cover maintains reliable performance after laundering while preserving the desired elastic properties.
2Ease of operation
If the outer cover is made stretchable, then it provides a secure fit, but it may cause skin marking when stretched
Solution Approach 1:
The patent controls the elastomeric content within specific ranges (at least 20% but not more than 40% by weight of the composite material) to provide sufficient stretch for secure fit while limiting excessive elasticity that could cause skin marking. This parameter optimization resolves the contradiction between fit security and comfort.
Solution Approach 2:
The outer cover incorporates elastic bands in specific regions (waist and leg openings) rather than making the entire cover uniformly stretchable. This localized elasticity provides secure fit at critical areas while reducing overall stretch that could cause skin marking on the wearer's body.
3Ease of operation
If the outer cover loses unload forces, then it becomes more comfortable, but it causes poor sustained fit and leakage
Solution Approach 1:
The outer cover uses an elastomeric material that provides dynamic, responsive elasticity - it stretches to accommodate movement and then actively recoils to maintain fit. This dynamic property allows the cover to adapt to wearer movement for comfort while simultaneously maintaining sustained fit through elastic recovery, resolving the contradiction between comfort and leakage prevention.
Solution Approach 2:
The combination of elastomeric and nonwoven layers creates a material with optimized mechanical properties where the elastomeric component provides the necessary unload forces for sustained fit, while the nonwoven component contributes to overall comfort and breathability. This composite structure resolves the contradiction between maintaining fit and ensuring comfort.
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 designed outer covers prevent sagging and slipping, maintaining comfort, attractiveness, and performance by retaining dimensional stability and elastic forces, thus preventing leakage and ensuring sustained fit throughout the intended lifespan.
Implementation Method 1
soft and stretchable knit fabrics with Spandex... maintain dimensional stability and elastic properties after multiple wash cycles
Implementation Method 2
maintain dimensional stability and elastic properties after multiple wash cycles... prevent sagging and slipping
Data Source
AI summary
Reusable outer covers for wearable absorbent articles.