Absorbent Core Channels for Liquid Distribution
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Solution Overview
Problem
Existing absorbent articles with absorbent cores lacking cellulose fibers or fluff pulp face issues with liquid distribution, retention, and migration, leading to discomfort, leakage, and reduced effectiveness due to homogeneously distributed absorbent polymer materials, which can act as liquid barriers and cause gel blocking, especially in flexible and lightweight designs.
Innovation Solution
An absorbent article with a liquid pervious topsheet and liquid impervious backsheet, featuring an absorbent core with specific attachment zones and a bridge zone that allows liquid to flow by capillary action and mass flow, creating channels for efficient liquid distribution and retention, preventing leakage and enhancing wear comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If absorbent polymer materials are homogeneously distributed in the absorbent core, then the absorbent core can maintain a continuous structure, but liquid distribution is impaired and gel blocking occurs reducing absorption efficiency
Solution Approach 1:
The absorbent core is segmented into multiple compartments or clusters of absorbent polymer material separated by channel-forming areas. This segmentation prevents homogeneous distribution while maintaining structural stability, allowing liquid to flow through channels without encountering continuous polymer barriers that would cause gel blocking.
Solution Approach 2:
Different regions of the absorbent core are assigned different functions: some regions contain absorbent polymer material for absorption, while other regions (channel-forming areas) are substantially free of absorbent material to facilitate liquid distribution. This local differentiation resolves the contradiction between continuous structure and effective liquid distribution.
2Reliability
If cellulose fibers or fluff pulp are used in the absorbent core, then liquid distribution and retention improve, but the absorbent article becomes bulkier and less flexible
Solution Approach 1:
The absorbent core utilizes the porous structure of absorbent polymer material in combination with channel-forming areas to achieve effective liquid distribution without requiring bulky cellulose fibers or fluff pulp. The porous material provides absorption capacity while the channels provide distribution pathways, maintaining a thin and flexible profile.
Solution Approach 2:
By segmenting the absorbent core into compartments and channel-forming areas, the design achieves efficient liquid distribution typically associated with fluff pulp structures, but with a more compact and flexible configuration that reduces overall core thickness.
3Quantity of substance
If high amounts of absorbent polymer material are used to replace cellulose fibers, then absorption capacity is maintained, but liquid distribution and retention become problematic due to gel blocking
Solution Approach 1:
The absorbent polymer material is divided into discrete compartments or clusters rather than being continuously distributed. This segmentation allows high amounts of polymer material to be used for maintaining absorption capacity while preventing gel blocking by ensuring liquid can flow through channel-forming areas between the compartments, improving liquid retention.
4Volume of moving object
If the absorbent core is made thinner and more flexible, then wearing comfort and portability improve, but liquid distribution capacity and wet integrity are reduced
Solution Approach 1:
The thin absorbent core incorporates channel-forming areas that are substantially free of absorbent material to create dedicated liquid distribution pathways. This local differentiation ensures that even in a thin configuration, liquid can be effectively distributed and retained, maintaining wet integrity without requiring increased thickness.
Solution Approach 2:
The use of porous absorbent polymer material in a thin, segmented configuration provides sufficient liquid distribution and retention capacity without requiring bulky structures, thereby maintaining wet integrity in thin and flexible designs.
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 solution improves liquid distribution and retention within the absorbent article, reducing leakage and discomfort by creating channels that facilitate liquid flow and absorption, maintaining the article's shape and integrity even when wet, thus enhancing user comfort and effectiveness.
Implementation Method 1
at least one of said second, third and fourth zone comprises a bridge zone (B) allowing a liquid flow (F) between the first and the second side edge (131, 132) by capillary action through the absorbent material
Implementation Method 2
The absorbent core comprises absorbent material that is able to absorb fluid and liquid bodily excretions of the user of the absorbent article
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2A~2B
AI summary
An absorbent article comprising a liquid pervious topsheet, a liquid impervious backsheet, and an absorbent core comprising an absorbent material between a top core wrap sheet and a back core wrap sheet, said absorbent core being positioned in between said topsheet and said backsheet, said absorbent core having a first and second side edge, a front edge and a rear edge, wherein the absorbent core is provided with a plurality of attachment zones where the top core wrap sheet is attached to the back core wrap sheet, and where substantially no absorbent material is present, wherein, seen in a longitudinal direction of the absorbent core, looking from the front edge to the rear edge, the absorbent core comprises subsequently a first, second, third, fourth and fifth zone.