Meandering Channels in Absorbent Core for Liquid Distribution
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Solution Overview
Problem
Existing disposable absorbent articles face challenges in maintaining core integrity while ensuring fast liquid distribution and efficient absorbent capacity, often compromising on absorption speed and distribution efficiency in attempts to improve integrity.
Innovation Solution
The absorbent article features a core with meandering channels flanked by absorbent material, where the channels have turning points with specific apex-to-centerline distance variations across different portions, enhancing liquid distribution and absorbent capacity without compromising core integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If channels are created by bonding upper and lower core wrap layers to form areas substantially free of absorbent material, then liquid distribution is improved, but core integrity is compromised
Solution Approach 1:
The patent applies local quality by creating channels only in specific zones (first and second zones) while maintaining absorbent material in other areas. The core wrap layers are bonded to form channels in targeted regions, allowing liquid distribution improvement without compromising overall core integrity. This selective channel creation enables different parts of the core to have different properties - some areas for distribution, others for retention.
Solution Approach 2:
The core is segmented into multiple zones with different functions. The first zone contains channels for rapid liquid distribution, the second zone has channels for additional distribution pathways, and other areas maintain full absorbent material for retention. This segmentation allows the core to perform multiple functions simultaneously - rapid distribution in channel zones and retention in absorbent material zones.
2Speed
If absorbent material is removed to create channels, then absorption speed is improved, but retention capacity is reduced
Solution Approach 1:
The patent creates channels with specific apex-to-centerline distance characteristics in localized zones. The first zone has channels with first apex-to-centerline distances, while the second zone has channels with second apex-to-centerline distances. This local differentiation allows rapid absorption in channel regions while maintaining retention capacity in surrounding absorbent material regions.
Solution Approach 2:
The core comprises a composite structure combining channels (bonded core wrap layers) and absorbent material. This composite design allows the system to exhibit both rapid liquid distribution properties (from channels) and high retention capacity (from absorbent material), resolving the contradiction between absorption speed and retention capacity.
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
This design improves liquid distribution and absorbent capacity, reducing leakage risks while maintaining core integrity and simplifying manufacturing processes.
Implementation Method 1
The channels have a meandering shape extending along a longitudinal direction and comprising a plurality of turning points
Implementation Method 2
the absorbent core must maintain its structure and not break or collapse either in a dry or in a wet state
Implementation Method 3
the absorbent core is generally composed of fibers of absorbent material and/or particles of superabsorbent material
Data Source
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AI summary
Absorbent article comprising an absorbent core in which absorbent material is substantially enclosed by a core wrap. The absorbent core comprises one or more channels flanked by absorbent material wherein at least one of the channels has a meandering shape comprising a plurality of turning points. The plurality of turning points comprises at least a first turning point and at least a second turning point wherein said at least first turning point is offset from said at least second turning point.