Layered Absorbent Core With Zoned Density For Softness And Absorption
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Solution Overview
Problem
Existing absorbent cores in disposable articles face challenges in achieving a balance between being soft and flexible while improving absorption rate and liquid distribution characteristics, with a need for more efficient use of superabsorbent materials and reduced cellulose fiber consumption.
Innovation Solution
A layered absorbent core with specific weight and density zones, comprising an upper and lower layer of absorbent fibers and an intermediate layer with a mixture of cellulose fibers and superabsorbent particles, where the intermediate layer includes distribution-storage, transition, and anti-leakage zones to optimize fluid absorption and retention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If superabsorbent materials are used to achieve suitable absorption and retention in thin absorbent cores, then absorption efficiency is improved, but the core may become less soft and flexible
Solution Approach 1:
The patent applies local quality by creating distinct zones within the absorbent core with different material compositions and properties. The core is divided into a first zone with higher superabsorbent material content for maximum absorption, and a second zone with lower superabsorbent material content and higher fiber content for softness and flexibility. This spatial variation in material properties allows different regions to fulfill different functions, resolving the contradiction between absorption efficiency and comfort.
2Ease of operation
If absorbent cores are made thinner to conform to the user's body, then comfort and fit are improved, but absorption capacity may be reduced
Solution Approach 1:
The patent applies parameter changes by varying the concentration of superabsorbent materials and fiber materials across different zones of the core. The first zone has a higher concentration of superabsorbent material (e.g., 70-90% by weight) to maximize absorption capacity, while the second zone has a lower concentration (e.g., 10-30% by weight) to maintain softness. This gradient in material parameters allows the core to be thin and conformable while still achieving high overall absorption capacity through optimized material distribution.
3Productivity
If zones with different densities are incorporated to improve absorption rate and liquid distribution, then absorption performance is improved, but core complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the absorbent core into distinct zones with different material compositions and densities. The core is segmented into a first zone with higher superabsorbent material content for rapid absorption and a second zone with lower superabsorbent material content for fluid distribution and retention. This segmentation creates functional gradients that improve absorption performance while maintaining a relatively simple overall structure that can be manufactured using conventional processes.
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 results in a thin, soft, and flexible core with enhanced absorption and distribution characteristics, reducing the risk of superabsorbent material migration and cellulose fiber usage, while preventing fluid return to the surface, thus improving the overall performance and efficiency of disposable absorbent articles.
Implementation Method 1
an absorbent core with zones of different specific weights and densities... a third layer comprising a mixture of absorbent material fibers and superabsorbent material (SAP) particles... very good absorption rate and liquid distribution characteristics
Implementation Method 2
superabsorbent materials have been used which may be mixed with the fibers of which the absorbent core is comprised by, or located on specific zones of the core... sodium or potassium polyacrylate particles
Data Source
AI summary
The invention relates to an absorbent core intended for use in a disposable absorbent article, said core comprising an upper surface and a lower surface, a front portion and a rear portion, two longitudinal edges and two transverse edges, and being formed of three layers: an upper layer, an intermediate layer and a lower layer. The upper and lower layers contain less than 25% superabsorbent material. The intermediate layer has three zones with different specific weights: one receiving and distribution zone, one or more transition zones and one or more anti-leakage zones.