Absorbent Core Structure for Thin Sanitary Napkins
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Solution Overview
Problem
Existing absorbent core structures for sanitary napkins face a trade-off between thinness for comfort and high absorbency, often compromising on fluid handling, particularly in controlling rewet and fast fluid acquisition.
Innovation Solution
An absorbent core structure comprising a substrate layer, a layer of absorbent polymer material, and a layer of adhesive, with specific thickness, permeability, and porosity characteristics, which allows for efficient fluid acquisition and retention while minimizing rewet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the absorbent core structure is made thinner to improve comfort and discreetness, then wearing comfort and adaptability are improved, but fluid acquisition effectiveness and control of rewet deteriorate
Solution Approach 1:
The absorbent core is divided into multiple functional layers: a substrate layer (0.4-1.5 mm thick) providing structural support, a superabsorbent polymer layer for fluid absorption, and a cover layer with high permeability (≥200 Darcy) and high porosity (≥0.85) for rapid fluid acquisition. This segmentation allows each layer to optimize for its specific function while maintaining overall thinness.
Solution Approach 2:
The invention uses composite material structures combining different fibrous materials and superabsorbent polymers in specific layers. The cover layer combines high permeability and high porosity characteristics to enable fast fluid acquisition, while the substrate layer provides mechanical strength. This composite approach resolves the contradiction by integrating materials with complementary properties.
2Length of moving object
If the absorbent core structure is made thinner, then wearing comfort is improved, but the ability to rapidly acquire fluid deteriorates
Solution Approach 1:
The cover layer is designed with high porosity (≥0.85) and high permeability (≥200 Darcy), creating a highly porous structure that facilitates rapid fluid penetration and acquisition. This porous material allows fluid to quickly reach the superabsorbent polymer layer despite the overall thinness of the core structure.
3Length of moving object
If the absorbent core structure is made thinner, then wearing comfort is improved, but the control of rewet deteriorates
Solution Approach 1:
The segmented layer structure creates distinct functional zones that work together to control rewet. The substrate layer provides structural integrity, the superabsorbent polymer layer absorbs and locks away fluid, and the high-performance cover layer manages fluid distribution. This segmentation prevents fluid migration back to the surface, maintaining low rewet in a thin structure.
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 structure achieves a balance between thinness, high absorbency, and low rewet, ensuring effective fluid management and comfort during use.
Implementation Method 1
the second layer of the absorbent core structure has a permeability of at least 200 Darcy
Implementation Method 2
the second layer of the absorbent core structure has a porosity of at least 0.85
Implementation Method 3
a layer of absorbent polymer material, comprising a first surface and a second surface
Implementation Method 4
superabsorbent materials, such as absorbent gelling materials (AGM), usually in finely dispersed form
Implementation Method 5
the absorbent core also comprises a layer of adhesive, comprising a first surface and a second surface
Data Source
AI summary
An absorbent core structure for disposable absorbent articles. The absorbent core having improved fluid handling properties. The absorbent core includes a first layer, a layer of absorbent polymer material, a layer of adhesive, and a second layer. The first layer has a first surface, a second surface, and a thickness of 0.4 mm to 1.5 mm.