Sanitary Napkin Elastic Modulus Ratio for Body Fit
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Solution Overview
Problem
Existing disposable absorbent articles, such as sanitary napkins, often fail to provide a reliable and comfortable body fit due to inadequate deformation mechanisms, which can lead to poor fluid handling and increased leakage.
Innovation Solution
A sanitary napkin design featuring a fluid-permeable facing layer with a higher elastic modulus than the absorbent core, joined to a fluid-impermeable backsheet, allowing for upward deformation upon lateral compression, thereby enhancing body fit and fluid handling performance without additional costly components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a deformation element is added to achieve convex upward configuration, then body fit is improved, but device complexity and cost increase
Solution Approach 1:
The patent changes the material parameters of the existing layers by selecting a topsheet with specific elastic modulus (0.1-10 kPa) and absorbent core with different elastic modulus (0.01-1.0 kPa), allowing the structure to deform convex upward through material property optimization rather than adding deformation elements
Solution Approach 2:
The patent removes the need for separate deformation elements by extracting the deformation function into the material properties of the existing topsheet and absorbent core layers, achieving the same effect with simpler structure
2Shape
If adhesive spots and grooves are carefully arranged to achieve inverted U-shape, then body fit is improved, but manufacturing complexity increases
Solution Approach 1:
The patent achieves inverted U-shape deformation through material parameter optimization (elastic modulus ratios) rather than complex adhesive patterns or grooves, simplifying manufacturing while maintaining the desired shape
3Shape
If elastically stretchable members are used to produce convex deformation, then body fit is improved, but manufacturing cost increases
Solution Approach 1:
The patent achieves convex deformation through optimized elastic modulus parameters of standard materials rather than expensive elastically stretchable members, reducing manufacturing cost while maintaining effectiveness
Solution Approach 2:
The patent uses inexpensive, disposable material combinations (topsheet and absorbent core with specific elastic moduli) to achieve the deformation effect, avoiding costly specialized components
4Shape
If W-shaped geometry is achieved through crease lines, then body fit is improved, but reliability is reduced
Solution Approach 1:
The patent achieves reliable body fit through material parameter optimization (elastic modulus relationships) that naturally produces consistent deformation, eliminating the unreliability of crease-line-dependent W-shape formation
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 design achieves improved comfort and fluid handling by ensuring the absorbent core and facing layer deform as a unit, providing close body contact and reducing leakage, while maintaining economic manufacturing simplicity.
Implementation Method 1
at equal strain from about 1% to about 5% the first elastic modulus is greater than the second elastic modulus
Data Source
AI summary
An absorbent article capable of reliably achieving an improved body-fitting profile. The absorbent article includes a fluid permeable facing layer having a first elastic modulus and an absorbent core joined to the facing layer, the absorbent core having a second elastic modulus, wherein at equal strain from about 1% to about 5% the first elastic modulus is greater than the second elastic modulus, and a fluid impermeable backsheet joined to the facing layer.