Multi-layer Absorbent Material Fluid Distribution
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Solution Overview
Problem
Current absorbent articles, such as diapers, face challenges with fluid uptake and distribution, leading to leakage and wearer discomfort due to the inability of the absorbent core to rapidly and completely absorb large amounts of liquid and distribute it evenly across the core.
Innovation Solution
A multi-layer absorbent material is introduced, comprising a central absorbent layer and a booster absorbent layer with a differential concentration of superabsorbent polymer particles. The booster layer, positioned near the front edge of the central layer, enhances fluid absorption and distribution, reducing the likelihood of leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single-layer absorbent core is used, then the structure is simple and manufacturing is easy, but the ability to rapidly absorb and distribute large amounts of liquid is insufficient
Solution Approach 1:
The absorbent core is divided into multiple layers with distinct functions: a first absorbent layer for rapid fluid uptake, a second absorbent layer for fluid distribution, and a third absorbent layer for additional absorption capacity. This segmentation allows each layer to be optimized for its specific function, improving overall absorption performance while maintaining manufacturing feasibility through standardized layer assembly
Solution Approach 2:
Different layers are assigned different material properties and thicknesses based on their specific functions. The first layer uses highly absorbent material with specific pore structure for rapid uptake, the second layer uses distribution-optimized material for even fluid spread, and the third layer provides additional capacity. This local optimization of material properties enhances overall system performance
2Quantity of substance
If the absorbent core is designed to hold large amounts of liquid, then absorption capacity increases, but liquid distribution and movement to remote regions deteriorates
Solution Approach 1:
The absorbent core is segmented into functional layers: the first layer provides rapid uptake capacity, the second layer serves as a distribution network with interconnected channels to move liquid to remote regions, and the third layer provides additional storage capacity. This segmentation ensures that high capacity does not compromise distribution ability
Solution Approach 2:
The second absorbent layer acts as an intermediary between the first layer (intake) and the third layer (storage). It receives liquid from the first layer and actively distributes it to remote regions through its distribution network, preventing saturation of the central target area and ensuring even liquid spread throughout the core
3Quantity of substance
If the absorbent core is made thicker to increase capacity, then more liquid can be absorbed, but product fit and wearer comfort deteriorate due to excessive bulkiness and sagging
Solution Approach 1:
Instead of using a single thick layer, the absorbent core is segmented into multiple thinner layers with combined thickness optimized for fit and comfort. Each layer is relatively thin but collectively they provide high absorption capacity, reducing bulkiness and sagging while maintaining product fit
Solution Approach 2:
The absorbent core uses a composite structure of three different absorbent layers with complementary properties. This composite approach allows optimization of both capacity and thickness profile, achieving high fluid retention without the excessive bulkiness associated with single thick layers
4Productivity
If a second absorbent layer is kept at low saturation to maintain intake capability, then fluid uptake is maintained, but control of incoming fluids to prevent leakage is insufficient
Solution Approach 1:
The absorbent core is segmented into three layers where the first layer maintains low saturation for rapid intake capability, the second layer provides distribution and initial containment, and the third layer provides additional capacity and leakage prevention. This segmentation allows the system to maintain both high intake capability and reliable leakage control
Solution Approach 2:
The second absorbent layer serves as an intermediary that receives liquid from the first layer and distributes it before it can cause leakage. It acts as a buffer and control mechanism, managing the flow of incoming fluids and preventing uncontrolled saturation that leads to leakage
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 multi-layer absorbent material effectively absorbs and distributes fluids, reducing leakage and enhancing wearer comfort by providing improved fluid uptake and retention capabilities throughout the life of the product.
Implementation Method 1
the booster absorbent layer comprises a nonwoven carrier with superabsorbent polymer particles
Implementation Method 2
superabsorbent polymer particles which are immobilized in a nonwoven carrier
Implementation Method 3
an acquisition and distribution layer positioned between the topsheet and the central absorbent layer for receiving fluids from the topsheet and transferring the fluids for absorption by the central absorbent layer
Data Source
Figure 1
Figure 2
AI summary
The present invention relates to a multi-layer absorbent material. More particularly, the invention relates to a layered, composite absorbent material with individual layers which are constructed and arranged to selectively cooperate to provide desired performance parameters in the composite, layered structure, to methods for manufacturing said multi-layer absorbent material, as well as to the use of a multi-layer absorbent material according to the invention in an absorbent article, particularly a diaper. Such a multi-layer material provides improved ability to absorb and retain fluids and consequently, prevents excessive rewetting and leakage. The present invention is of particular importance to the field of hygiene products, in particular diapers.