Absorbent Core Fluid Immobilization via Layer Segmentation
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Solution Overview
Problem
Existing absorbent cores for sanitary napkins and similar products face challenges in efficiently managing and retaining body fluids, particularly menses or blood, due to limitations in fluid distribution and immobilization, leading to discomfort and reduced effectiveness.
Innovation Solution
A three-layer composite absorbent core structure is introduced, comprising a substrate layer with synthetic fibers, a layer of absorbent polymer material, and a layer of adhesive, where the absorbent polymer material is sandwiched between the substrate layer and the adhesive, with a cover layer optional, to enhance fluid management and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a thin absorbent core structure is used, then comfort and discreetness are improved, but fluid distribution and immobilization efficiency deteriorate
Solution Approach 1:
The absorbent core is divided into three distinct functional layers: a first fibrous nonwoven layer for fluid acquisition, a superabsorbent polymer layer for fluid absorption and immobilization, and a second fibrous nonwoven layer for fluid distribution. This segmentation allows each layer to perform its specific function efficiently within a thin overall structure, resolving the contradiction between thin design and fluid management effectiveness.
Solution Approach 2:
The invention uses a composite structure combining different materials with complementary properties: fibrous nonwoven materials for fluid wicking and distribution, and superabsorbent polymers for bulk fluid absorption. This composite approach enables the thin core to achieve both comfort and effective fluid immobilization by leveraging the strengths of each material type.
2Reliability
If superabsorbent materials are localized in concentrated arrangements, then fluid retention is improved, but fluid distribution capability deteriorates
Solution Approach 1:
The system separates fluid distribution and fluid retention functions into different layers. The first fibrous nonwoven layer handles fluid distribution through capillary action, while the superabsorbent polymer layer handles fluid retention. This functional segmentation resolves the contradiction by allowing each layer to optimize for its specific purpose without compromising the other.
Solution Approach 2:
The first fibrous nonwoven layer acts as an intermediary between fluid source and the superabsorbent polymer layer. It receives fluid from the topsheet and distributes it evenly across the superabsorbent layer, preventing localized saturation and ensuring uniform fluid retention throughout the concentrated superabsorbent regions.
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 improves fluid immobilization and absorption efficiency, providing better comfort and performance during use by optimizing the distribution and retention of body fluids, even with complex fluids like menses or blood, while maintaining a thin and flexible design.
Implementation Method 1
a layer of absorbent polymer material... capable of absorbing large quantities of liquids and of retaining such absorbed liquids
Implementation Method 2
a layer of adhesive... The first layer is joined to a face of the second layer in a face to face relationship by bonding between the layers
Implementation Method 3
The substrate layer comprises a composite of at least a first layer and third layer of fibrous nonwoven webs
Data Source
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AI summary
Absorbent core for disposable absorbent articles, for example for the absorption of menses or blood. The absorbent core comprises a substrate layer, thereon a layer of absorbent polymer material, and thereon a layer of adhesive. Either said a substrate layer or said cover layer or both may comprises o composite of at least a first layer and third layer of fibrous non-woven webs, said first layer and said third layer comprising synthetic fibers with an average fiber denier from 1 to 6, said composite further comprises a second layer comprising pulp; the layers of the composite being placed in the order first- second- third and bonded by intertwining the fibers between the layers, e.g. by hydroentanglement. Said first and third layers of said composite may be spunbonded.