Absorbent Core Matrix With Bonding Regions For Liquid Distribution
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Solution Overview
Problem
Existing absorbent articles face challenges in maintaining core integrity while ensuring fast liquid distribution and being cost-effective to manufacture, as they often compromise on absorption and distribution efficiency.
Innovation Solution
The absorbent article features a core wrap with discrete bonding regions and unfastened regions, forming an interconnected matrix that allows for efficient liquid distribution and core integrity, with a bonding region to unfastened region weight ratio less than 0.25, and channels that facilitate liquid flow without obstructing absorbent material expansion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the absorbent core is stabilized using nets, adhesives, core wraps, or embossing to prevent breaking, then core integrity is improved, but liquid absorption and distribution speed deteriorate
Solution Approach 1:
The core wrap is segmented into bonding regions and unfastened regions, creating a patterned structure that alternates between providing structural support and allowing rapid liquid distribution. This segmentation resolves the contradiction by spatially separating the functions of integrity maintenance and liquid distribution.
Solution Approach 2:
Different regions of the core wrap are assigned different properties: bonding regions provide structural support and integrity, while unfastened regions provide rapid liquid distribution pathways. This local differentiation resolves the contradiction by allowing each region to optimize for its specific function.
2Speed
If channels are created by bonding upper and lower core wrap layers directly to form channel-forming areas free of absorbent material, then liquid distribution is improved, but core integrity deteriorates
Solution Approach 1:
The core wrap structure is segmented into bonding regions that maintain integrity and unfastened regions that form distribution channels. This segmentation allows channels to form without directly bonding the layers, resolving the contradiction between channel formation and integrity maintenance.
Solution Approach 2:
The unfastened regions act as intermediary spaces between the bonding regions, allowing liquid to flow through channels formed by the separation of core wrap layers without requiring direct bonding of the layers themselves. This intermediary structure resolves the contradiction by providing channel formation while maintaining overall integrity through the bonding regions.
3Ease of manufacture
If zones with lower basis weight are created to facilitate folding and reduce material, then manufacturing cost is reduced, but core integrity deteriorates
Solution Approach 1:
The core wrap structure incorporates local variations in basis weight and bonding density, with bonding regions providing structural support and unfastened regions providing flexibility and reduced material usage. This local quality differentiation resolves the contradiction between cost reduction and integrity maintenance.
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 configuration enhances core integrity, maintains efficient liquid distribution, and reduces the amount of absorbent material needed, while allowing for volume expansion and cost-effectiveness in manufacturing.
Implementation Method 1
the top core wrap layer and a bottom core wrap layer are joined together at one or more bonding regions substantially free of absorbent material
Implementation Method 2
its main functions are to absorb and to retain liquid or semi-liquid exudates from the human body that penetrate through the upper layer of the article
Data Source
AI summary
An absorbent article comprising: a topsheet; a backsheet; and an absorbent core sandwiched between said topsheet and backsheet; said core comprising absorbent material that is substantially enclosed by a core wrap, wherein said core wrap comprises a top core wrap layer and a bottom core wrap layer, said core comprising an absorbent-material-deposition zone comprising a first basis weight of absorbent material, and wherein the top core wrap layer and a bottom core wrap layer are joined together at one or more bonding regions substantially free of absorbent material; and wherein said core further comprises one or more unfastened regions comprising a second basis weight of absorbent material, and wherein the first basis weight is greater than the second basis weight; wherein the one or more bonding regions and the one or more unfastened regions are substantially connected to each other to form an interconnected matrix or shape extending along a longitudinal direction running substantially parallel to a longitudinal centreline of said absorbent core wherein said interconnected matrix or shape is flanked and/or circumscribed by absorbent material of the absorbent-material-deposition zone and the one or more unfastened regions are substantially free of absorbent material such that a ratio of second basis weight to first basis weight is less than 0.25.