Layered Absorbent Core Structure for Fast Uptake and Leak Protection
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Solution Overview
Problem
Existing absorbent articles face challenges in providing improved fit, discretion, and leakage protection, with a need for absorbent cores that can quickly uptake liquid and minimize leakage.
Innovation Solution
A layered absorbent core structure comprising a top layer, a bottom layer, a reinforcement layer, and multiple absorbent layers with varying compositions of superabsorbent and fibrous materials, including adhesive layers to stabilize the structure and enhance liquid retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single-layer absorbent core is used, then the structure is simple, but the liquid uptake speed and leakage protection are insufficient
Solution Approach 1:
The absorbent core is divided into multiple functional layers: a first absorbent layer containing superabsorbent material for rapid liquid uptake, a second absorbent layer with different absorbent material for additional retention, and a reinforcement layer for structural support. This segmentation allows each layer to perform its specific function optimally, improving overall leakage protection while maintaining manageable complexity.
Solution Approach 2:
The invention uses composite material composition within the absorbent layers, combining superabsorbent material with other absorbent materials in specific proportions. This composite approach enables the core to leverage the rapid uptake capability of superabsorbent material while incorporating the bulk retention properties of other absorbent materials, thereby enhancing leakage protection.
2Reliability
If the absorbent core is made thicker to increase capacity, then the leakage protection improves, but the product thickness increases
Solution Approach 1:
Different regions of the absorbent core are assigned different material compositions and thicknesses based on local requirements. The first absorbent layer with superabsorbent material is positioned to handle rapid liquid influx, while the second absorbent layer provides additional retention. The reinforcement layer is strategically placed to provide structural support where needed, optimizing leakage protection without uniformly increasing overall thickness.
Solution Approach 2:
The invention optimizes the thickness and material composition parameters of each layer to achieve the desired balance. By carefully controlling the thickness of each functional layer and the proportion of superabsorbent material within them, the design achieves effective leakage protection while minimizing the overall product thickness.
3Speed
If more superabsorbent material is added to increase liquid uptake, then the uptake speed improves, but the cost and material complexity increase
Solution Approach 1:
Instead of using excessive superabsorbent material throughout the entire core, the invention applies it partially in the first absorbent layer where it is most needed for rapid liquid uptake. The second absorbent layer uses different absorbent material for additional retention. This partial application of superabsorbent material achieves fast uptake speed while reducing overall material complexity and cost.
Solution Approach 2:
Superabsorbent material is concentrated in the first absorbent layer where rapid liquid uptake is critical, rather than being uniformly distributed throughout the entire core. This local concentration approach maximizes the liquid uptake speed benefit while minimizing the amount of expensive superabsorbent material required, thereby reducing overall material complexity.
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 layered absorbent core design enhances liquid uptake and retention, providing improved fit and reduced leakage protection in absorbent articles.
Implementation Method 1
the first absorbent layer comprising absorbent material which comprises substantially only superabsorbent material
Implementation Method 2
superabsorbent material embedded within the reinforcement layer
Implementation Method 3
adhesive disposed between the top layer and the second absorbent layer, between the second absorbent layer and the reinforcement layer, and between the first absorbent layer and the bottom layer
Data Source
AI summary
Absorbent cores comprising a layered structure and methods of manufacture are disclosed. An absorbent article can include a layered absorbent structure having top and bottom layers enclosing a reinforcement layer. The body can have a first absorbent layer between the reinforcement layer and the bottom layer, a second absorbent layer between the top layer and the reinforcement layer, and a third absorbent layer disposed between the top layer and the second absorbent layer with the third absorbent layer comprising fibrous absorbent material. The first and second absorbent layers can include superabsorbent material, and superabsorbent material can be embedded within the reinforcing layer. Adhesive can be disposed between the top layer and the third absorbent layer, between the second absorbent layer and the reinforcement layer, and between the first absorbent layer and the bottom layer.