Absorbent Core Channels in a High-Loft Central Layer
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Solution Overview
Problem
Existing absorbent cores in personal hygiene products face challenges in improving wearing comfort, reducing raw material usage, and enhancing fluid management while maintaining cost-effectiveness, particularly in airfelt-free cores that use high permeability superabsorbent polymers.
Innovation Solution
An absorbent core design featuring a high loft fibrous nonwoven central layer with integrated channels free of superabsorbent polymer particles, combined with a top and bottom layer, uses low permeability SAP particles and a C-wrap construction to enhance fluid distribution and reduce leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If airfelt-free cores with conventional SAP are used, then absorbent capacity is improved, but leakage risk increases due to insufficient fluid passage
Solution Approach 1:
The absorbent core is segmented into multiple functional zones: a high-loft central layer with channels for fluid passage, and lateral absorbent regions with SAP particles for absorption. This segmentation allows simultaneous optimization of fluid transport (through channels) and absorption capacity (through SAP zones), preventing leakage while maintaining high absorbency.
Solution Approach 2:
Different regions of the absorbent core are assigned different properties: the central layer has high loft and low density for fluid distribution, while the lateral regions contain SAP particles for absorption. The channels are positioned specifically to guide fluid away from side edges, creating local quality variations that simultaneously improve fluid management and prevent leakage.
2Ease of operation
If high permeability SAP is used in airfelt-free cores, then fluid passage is improved, but absorbent capacity decreases and cost increases
Solution Approach 1:
The invention separates the fluid passage function from the absorption function. Channels in the high-loft central layer handle fluid transport, while SAP particles in lateral regions handle absorption. This allows use of conventional low-permeability SAP (improving capacity and reducing cost) while maintaining efficient fluid passage through the channel structure.
Solution Approach 2:
The channel structure acts as an intermediary element that facilitates fluid passage without relying on high-permeability SAP. The channels provide a dedicated pathway for fluid transport, decoupling the permeability requirement from the SAP material properties, thereby enabling use of cost-effective conventional SAP with high absorbent capacity.
3Ease of operation
If cellulose fibers are used in absorbent cores, then capillary fluid draw is improved, but material cost and production complexity increase
Solution Approach 1:
The invention extracts the fluid distribution function from cellulose fibers and transfers it to the channel structure in the high-loft central layer. By removing the dependency on cellulose capillary action, the design simplifies material selection and production while maintaining effective fluid distribution through the engineered channel geometry.
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 improves wearing comfort by allowing efficient fluid passage and distribution, reduces the risk of leakage, and lowers material costs by utilizing cheaper SAP particles, while maintaining effective fluid retention.
Implementation Method 1
there are no cellulose fibers to draw the fluid by capillarity within the core
Implementation Method 2
superabsorbent polymers (SAP) particles, also called absorbent gelling materials (AGM)
Implementation Method 3
The central layer is a high loft fibrous nonwoven layer... the void areas of the high loft layer also provide for an improved fluid passage
Data Source
AI summary
An absorbent core for use in an absorbent article, the absorbent core extending in a transversal direction and a longitudinal direction. The absorbent core includes a fluid-permeable top layer, a bottom layer, and a middle layer between the top layer and the bottom layer. The middle layer may be a high loft fibrous nonwoven layer, in particular having a density of less than about 0.200 g/cc, measured at a pressure of 4.14 kPa. Superabsorbent polymer particles may be blended with the fibers of the middle layer, except for one or more longitudinally-extending channels substantially free of superabsorbent polymer particles.