Responsive Absorbent Core Topography for Faster Fluid Intake
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Solution Overview
Problem
Existing absorbent articles with superabsorbent materials (SAMs) face challenges due to in-plane swelling, leading to wrinkling and buckling, which hinder the development of products with enhanced fluid distribution and intake capabilities.
Innovation Solution
Incorporating a heterogeneously attached absorbent core that swells significantly in a lateral direction upon wetting, creating responsive topography features to enhance fluid distribution and intake, using materials like FRODO with elastic fibers that expand up to 70% in the cross-machine direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If superabsorbent materials with directional swelling are used to enhance fluid distribution and intake, then absorption performance is improved, but wrinkling and buckling occur due to in-plane swelling
Solution Approach 1:
The absorbent core is segmented into multiple layers with different properties: a first layer with directional swelling capability and a second layer with restraining capability. This segmentation allows the swelling function to be separated from the shape-stabilizing function, enabling fluid intake enhancement without surface buckling.
Solution Approach 2:
Different regions of the absorbent core are assigned different functions: the first layer provides localized swelling for fluid distribution, while the second layer provides localized restraint to maintain surface flatness. This local quality differentiation resolves the contradiction between swelling-induced absorption and swelling-induced deformation.
2Ease of operation
If in-plane swelling is utilized to create channels and void volume for fluid distribution, then fluid distribution is enhanced, but product complexity increases due to topography control requirements
Solution Approach 1:
The absorbent core utilizes its own swelling force to automatically create channels and void volume for fluid distribution. The first layer's directional swelling inherently generates the desired topography without requiring external control mechanisms, simplifying the overall product design while maintaining enhanced fluid distribution.
3Stability of the object's composition
If conventional absorbent materials are used to maintain structural stability, then shape stability is improved, but fluid intake capability is reduced
Solution Approach 1:
The absorbent core is constructed as a composite of two layers with complementary properties: the first layer provides fluid intake capability through directional swelling, while the second layer provides structural stability through restraining properties. This composite structure enables both high fluid intake capability and maintained structural stability simultaneously.
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 absorbent articles achieve reduced intake times, enhanced fluid distribution, and improved capture of runny biological materials by leveraging the swelling force to create channels and void spaces, reducing oversaturation and leakage.
Implementation Method 1
the absorbent core swells in a lateral direction by at least about 20% such that the wetted absorbent core presents a responsive topography feature
Data Source
AI summary
Described herein are responsive absorbent articles. The responsive absorbent articles are capable of producing unique topographies and features upon wetting that add or enhance functionality as compared to conventional absorbent articles. Compositions and methods described herein are useful in a variety of absorbent products.