Absorbent Core Intermediate Layer for Stability
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Solution Overview
Problem
Absorbent articles with channel structures face challenges in maintaining core integrity, especially when subjected to movement stress, due to the absence of effective immobilization means, leading to the need for significant adhesive and mechanical bonding, which increases costs and affects liquid handling properties.
Innovation Solution
Incorporating an intermediate layer between the top and bottom layers of the core wrap in absorbent articles, with absorbent material sandwiched between these layers, to enhance core stability and liquid distribution, while using a combination of cellulose fibers and superabsorbent polymers to improve rewet performance and dryness perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If absorbent material is freely distributed within the core wrap without immobilization means, then manufacturing simplicity is maintained, but core integrity deteriorates during movement stress
Solution Approach 1:
The core wrap is segmented into multiple layers (first core wrap layer, second core wrap layer, third core wrap layer) with absorbent material distributed between them. This segmentation provides structural support while maintaining manufacturing simplicity through a layered assembly process.
Solution Approach 2:
The absorbent material is nested between multiple core wrap layers, creating a sandwich structure where the first core wrap layer contains absorbent material, which is then contained by the second and third core wrap layers. This nesting provides immobilization without requiring additional adhesive bonding steps.
2Stability of the object's composition
If significant adhesive and mechanical bonding is used to maintain core integrity, then core stability improves, but liquid handling properties deteriorate and costs increase
Solution Approach 1:
The core wrap layers are constructed as flexible thin film structures that provide mechanical containment and stability without requiring adhesive bonding. The layered film structure maintains core integrity through its geometric configuration and material properties alone, preserving liquid handling capabilities.
Solution Approach 2:
The invention uses a simple layered structure that relies on the inherent properties of the core wrap materials rather than expensive adhesive bonding systems. The design accepts that the structure is disposable and focuses on providing adequate containment through straightforward layering rather than permanent bonding.
3Stability of the object's composition
If absorbent material is spatially constricted into compartments, then immobilization improves, but device complexity increases
Solution Approach 1:
The core wrap is divided into multiple sequential layers that naturally compartmentalize the absorbent material. Each layer acts as a barrier that constrains the material in a simple linear progression, providing immobilization without requiring complex three-dimensional compartment structures.
Solution Approach 2:
Instead of constraining absorbent material in horizontal compartments within the plane of the core, the invention uses vertical layering to achieve spatial constriction. The multiple core wrap layers stacked in the thickness direction provide compartmentalization效果 without the complexity of in-plane compartment structures.
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 improves core integrity and liquid handling capabilities while reducing the need for excessive adhesive and mechanical bonding, resulting in a cost-effective solution with enhanced absorbency and comfort.
Implementation Method 1
an intermediate layer positioned between a top layer of the core wrap and a bottom layer of the core wrap such that the absorbent material is confined between the top layer and the intermediate layer and between the bottom layer and the intermediate layer
Implementation Method 2
an absorbent core positioned between the topsheet and backsheet, wherein the absorbent core comprises an absorbent material
Implementation Method 3
EP3342386 describing an absorbent core comprising substantially continuous zones of one or more high fluid distribution structures and discontinuous zones of fluid absorption structures
Data Source
Figure 1A~1D
Figure 2A~2C
Figure 3A~3C
AI summary
An absorbent article comprising: a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent core positioned between said topsheet and backsheet, wherein the absorbent core comprises an absorbent material, said absorbent material comprising cellulose fibers and/or superabsorbent polymers, and wherein said absorbent material is contained within at least one core wrap substrate enclosing said absorbent material therein, wherein the absorbent core further comprises an intermediate layer positioned between a top layer of said core wrap and a bottom layer of said core wrap such that said absorbent material is disposed between said top layer and said intermediate layer and between said bottom layer and said intermediate layer.