Dual-Layer Absorbent Core for Menstrual Fluid Management
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Solution Overview
Problem
Absorbent articles designed for menstrual fluid absorption face challenges in balancing comfort, fit, and absorbency, particularly in handling occasional 'gush' flows while maintaining appearance and comfort post-use.
Innovation Solution
The design incorporates an asymmetric dual-layer absorbent core with a smaller, higher-density upper layer and a larger, lower-density lower layer, utilizing open-celled foam and airlaid materials to enhance fluid handling and distribution, ensuring improved fit and reduced wetness without increasing the overall thickness or width of the article.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the width or thickness of the absorbent article is increased to improve absorbency, then the absorbency is improved, but the comfort is worsened
Solution Approach 1:
The absorbent core is divided into two layers with different densities and functions. The first layer (higher density) is positioned at the front where menstrual fluid discharge occurs, providing targeted absorbency. The second layer (lower density) is positioned at the back, providing additional absorbency capacity without increasing overall thickness. This segmentation allows the article to handle both trickle and gush flows effectively while maintaining comfort.
Solution Approach 2:
Different regions of the absorbent article are given different properties to match the distribution of menstrual fluid. The front region (first layer) has higher density and absorbency to handle the primary discharge point, while the back region (second layer) has lower density for secondary absorption. This local differentiation optimizes absorbency where needed while minimizing bulk in less critical areas, thereby improving comfort.
2Quantity of substance
If the width or thickness of the absorbent article is increased to handle gush flow, then the absorbency is improved, but the fit is worsened
Solution Approach 1:
The absorbent core is segmented into two layers with different densities and absorbency capacities. The first layer (higher density) is positioned at the front to handle immediate gush flow, while the second layer (lower density) provides additional capacity. This segmentation allows the article to handle gush flow effectively without requiring a uniform increase in overall thickness, thereby maintaining better fit.
Solution Approach 2:
The patent changes the density parameter of the absorbent layers to optimize performance. The first layer has a higher density (0.15-0.30 g/cm³) for immediate absorption, while the second layer has a lower density (0.05-0.20 g/cm³) for additional capacity. This parameter differentiation allows the article to handle varying flow rates without increasing overall dimensions, thereby improving fit.
3Adaptability or versatility
If the absorbent article is designed to match the natural body shape, then the fit is improved, but the absorbency distribution is worsened
Solution Approach 1:
The absorbent core is segmented into two layers that can be positioned at different locations along the longitudinal axis of the article. This segmentation allows the article to match the natural body shape (improving fit) while simultaneously providing differentiated absorbency distribution - with the higher density first layer at the front for primary discharge and the lower density second layer at the back for secondary absorption.
Solution Approach 2:
Different regions of the absorbent article are given different densities and absorbency properties to match both the body shape and the distribution of menstrual fluid. The front region has higher density for primary absorption, while the back region has lower density for secondary absorption. This local quality differentiation resolves the contradiction between fit and absorbency distribution.
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 provides enhanced absorbency where needed, improves comfort and fit by matching the natural body shape, reduces bunching, and maintains a uniform appearance post-use by minimizing fluid retention and distribution differences between the layers.
Implementation Method 1
the absorbent core has a first density zone and a second density zone... the upper layer is in closer proximity to the body of the wearer... designed to acquire menstrual fluid
Implementation Method 2
utilizing open-celled foam and airlaid materials to enhance fluid handling and distribution
Data Source
Figure 1
Figure 1A
Figure 1B
AI summary
An absorbent article. The absorbent article includes a topsheet having a body contacting surface, a backsheet joined to said topsheet, and an absorbent core disposed between the topsheet and the backsheet, wherein the absorbent core has an upper layer and a lower layer. The lower layer has two density zones.