Absorbent Article Surface Layer for Low Friction and Absorbency
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Solution Overview
Problem
Absorbent articles cause skin irritation due to friction and moisture-related factors, leading to issues like chafing and itchiness, and the use of hydrophobic compositions to mitigate this affects absorbency.
Innovation Solution
An absorbent article with a low-friction air-through-bonded fibrous nonwoven surface layer and an intermediate layer with lower elongation than the surface layer, attached via adhesives or welding, providing reduced friction and improved integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrophobic compositions are used to reduce friction and skin irritation, then friction and skin irritation are reduced, but absorbency performance deteriorates
Solution Approach 1:
The patent introduces an intermediate layer between the surface layer and backsheet that acts as a mediator to reduce friction and skin irritation without compromising absorbency. This intermediate layer has specific properties (elongation at 10N/50mm lower than surface layer) that allow it to reduce mechanical interaction with skin while maintaining fluid transport pathways for absorbency.
Solution Approach 2:
The patent applies different properties to different layers: the surface layer has high elongation for low friction, while the intermediate layer has lower elongation for structural support and absorbency maintenance. This local differentiation of material properties allows each layer to optimize its function without compromising the other.
2Object-affected harmful factors
If air through bonded fibrous nonwoven surface layer is used to reduce friction, then friction is reduced, but material integrity may deteriorate
Solution Approach 1:
The patent creates a composite structure combining a surface layer with high elongation properties (for low friction) and an intermediate layer with lower elongation properties (for structural integrity). This composite approach allows the surface layer to prioritize friction reduction while the intermediate layer maintains overall structural strength.
Solution Approach 2:
The patent divides the absorbent article into distinct functional layers: a surface layer optimized for friction reduction and an intermediate layer optimized for structural support. This segmentation allows each layer to be independently optimized for its specific function without compromising the other.
3Object-affected harmful factors
If surface layer material is made more compliant to reduce friction, then friction is reduced, but structural integrity during manufacturing and use may worsen
Solution Approach 1:
The patent uses a composite structure where the surface layer has high elongation (compliant, low friction) and the intermediate layer has lower elongation (structurally stable). This composite material approach allows the surface layer to be compliant for friction reduction while the intermediate layer provides structural integrity throughout manufacturing and use.
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 solution reduces skin irritation by minimizing friction and rapid liquid spreading, maintaining absorbency without the need for hydrophobic compositions.
Implementation Method 1
The air through bonded fibrous nonwoven surface layer having a basis weight of from 14 to 30 g/m2 and a density of from 20 to 90 kg/m3 has been found to provide the surface layer with surprisingly low friction values against the skin both under dry and wet conditions.
Implementation Method 2
The air through bonded fibrous nonwoven surface layer additionally provides the absorbent article with a rapid inlet with a reduced liquid spreading surface
Data Source
AI summary
The absorbent article as disclosed herein has longitudinal side edges extending in a longitudinal direction and transverse front and rear end edges extending in a transverse direction. The absorbent article comprises a fluid permeable surface layer, a backsheet and an intermediate layer located between the fluid permeable surface layer and the backsheet. The surface layer has a wearer-facing portion facing the user during use. The surface layer is an air through bonded fibrous nonwoven surface layer having a basis weight of from 14 to 30 g/m2 and a density of from 20 to 90 kg/m3. The intermediate layer extends under from 70 to 100% of the wearer-facing portion of the surface layer. The intermediate layer and the surface layer have a respective elongation at 10 N/50 mm. The elongation of the intermediate layer is lower than the elongation of the surface layer.