Drapeable Sanitary Napkin Composite Structure
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Solution Overview
Problem
Existing sanitary absorbent napkins lack drapeability, leading to discomfort and inadequate protection, despite advancements in flexibility and absorbency.
Innovation Solution
A sanitary napkin design featuring a cover layer, a barrier layer, and an absorbent system with superabsorbent polymer (SAP) arranged between the layers, achieving a DCDI value of at least 0.50 and an absorbency index of at least 1.5, ensuring both flexibility and drapeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the thickness of sanitary napkins is reduced to improve comfort and reduce obtrusiveness, then the article becomes thinner and more comfortable, but the drapeability and ability to conform to body shape deteriorates
Solution Approach 1:
The patent employs a composite structure consisting of a nonwoven cover layer, an absorbent core layer containing superabsorbent polymer particles, and a nonwoven back layer. This multi-layer composite design enables the thin article to achieve both reduced thickness and improved drapeability through the synergistic properties of different materials working together.
Solution Approach 2:
The patent utilizes superabsorbent polymer particles with specific physical and chemical parameters (particle size distribution, crosslinking degree, swelling ratio) to achieve high absorbency in a thin profile. By optimizing these parameters, the article maintains flexibility and drapeability while providing adequate absorbency capacity.
2Quantity of substance
If superabsorbent polymer is added to increase absorbency, then the absorbency index increases, but the article becomes less flexible and less drapeable
Solution Approach 1:
The absorbent core layer is designed with non-uniform distribution of superabsorbent polymer particles, creating zones of different absorbency. This local quality variation allows the article to provide high absorbency where needed while maintaining flexibility and drapeability in other areas, particularly at the edges and surfaces in contact with the body.
Solution Approach 2:
The patent employs porous nonwoven materials for the cover and back layers, which provide structural flexibility and drapeability. The porous structure allows these layers to bend and conform to body contours while the absorbent core provides the necessary absorbency capacity.
3Volume of moving object
If the article is made thinner to reduce obtrusiveness, then comfort is improved, but the ability to provide adequate protection deteriorates
Solution Approach 1:
The superabsorbent polymer particles undergo phase transition from dry granular state to swollen gel state upon contact with fluid. This phase transition enables the thin article to rapidly absorb and lock away large volumes of fluid, providing adequate protection despite the reduced thickness of the overall structure.
Solution Approach 2:
The composite structure combines materials with complementary properties: the nonwoven layers provide structural integrity and flexibility, while the superabsorbent polymer provides high-capacity fluid absorption. This material combination enables the thin article to maintain both comfort and reliable protection capability.
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 enhances comfort by conforming to the body's shape, providing effective fluid handling and protection while maintaining thinness and flexibility.
Implementation Method 1
an absorbent system including superabsorbent polymer (SAP) arranged between the cover layer and the barrier layer
Implementation Method 2
superabsorbent polymer (SAP) arranged between the cover layer and the barrier layer
Data Source
AI summary
An absorbent article including a cover layer, a barrier layer and an absorbent system arranged between the cover layer and the barrier layer, the absorbent article being drapeable and possessing the absorbency attributes required of a sanitary napkin.