Multi-layer Absorbent Core with Stabilized Superabsorbent Material
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Solution Overview
Problem
Current absorbent articles face challenges in achieving optimal fit, discretion, and leakage protection, with existing absorbent bodies needing improvement in terms of thickness, liquid uptake speed, and retention capacity.
Innovation Solution
A layered absorbent body structure is formed by combining a top and bottom liquid-permeable covering material with a reinforcing material in between, where superabsorbent material is strategically distributed within the reinforcing material in high and low concentration regions, and the structure is embossed to enhance SAM particle stabilization and fluid flow efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the absorbent body is made thinner to improve discretion and fit, then the thickness is reduced, but the liquid uptake speed and retention capacity deteriorate
Solution Approach 1:
The absorbent body is divided into multiple functional layers including a liquid-permeable covering material, a reinforcing material layer, and a superabsorbent material layer. This segmentation allows each layer to perform its specific function efficiently, enabling thin overall thickness while maintaining high liquid uptake speed through the optimized liquid flow path from covering material to superabsorbent material.
Solution Approach 2:
The patent combines different materials with complementary properties: a liquid-permeable covering material for rapid liquid entry, a reinforcing material for structural integrity, and superabsorbent material for high-capacity retention. This composite structure achieves both thin thickness and high performance by selecting materials that excel in their respective functions.
2Quantity of substance
If more superabsorbent material is added to increase retention capacity, then the retention capacity improves, but the thickness increases
Solution Approach 1:
The superabsorbent material is strategically positioned in specific regions where liquid accumulation is most likely to occur, rather than uniformly distributing it throughout the entire absorbent body. This localized placement maximizes retention capacity in critical areas while minimizing overall thickness.
Solution Approach 2:
The patent optimizes the horizontal distribution and concentration of superabsorbent material within the reinforcing material layer, utilizing the two-dimensional plane more effectively rather than simply increasing vertical thickness. This allows high retention capacity to be achieved through optimized spatial arrangement rather than increased volume.
3Quantity of substance
If superabsorbent material is concentrated in one area to improve retention, then the retention capacity improves, but gel-blocking increases
Solution Approach 1:
The superabsorbent material is distributed in a controlled pattern with varying concentrations across different regions of the absorbent body. Areas with higher liquid flow receive higher concentrations for maximum retention, while other areas have lower concentrations to prevent gel-blocking. This spatial variation in quality optimizes both retention capacity and gel-flow characteristics.
4Ease of manufacture
If the absorbent body structure is simplified to reduce manufacturing complexity, then the ease of manufacture improves, but the liquid uptake speed and retention capacity deteriorate
Solution Approach 1:
The absorbent body is constructed as a laminate of distinct layers that can be manufactured separately and then bonded together. This segmentation allows each layer to be optimized and manufactured using standard processes, maintaining ease of manufacture while achieving high liquid uptake speed through the optimized multi-layer architecture.
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 improved liquid intake speed, retention capacity, and reduced gel-blocking, while maintaining lamination strength and user comfort, by optimizing the distribution and stabilization of superabsorbent material within the absorbent body.
Implementation Method 1
superabsorbent material disposed within the reinforcing material in a pattern of high-SAM concentration regions and low-SAM concentration regions
Implementation Method 2
These absorbent bodies are generally responsible for capturing and retaining liquid bodily exudates
Implementation Method 3
embossing the laminate structure
Data Source
AI summary
Multi-layered absorbent bodies and methods of manufacture are disclosed. An absorbent body may comprise a top, liquid permeable covering material, a bottom covering material, a reinforcing material disposed between the top covering material and the bottom covering material, the reinforcing material bonded directly to the top covering material by a first adhesive layer and bonded directly to the bottom covering material by a second adhesive layer, and superabsorbent material disposed between the top covering material and the bottom covering material, wherein between about 30% and about 85%, by weight, of the total amount of superabsorbent material disposed between the top covering material and the bottom covering material is stabilized within the reinforcing material, as determined according to the SAM Stabilization Location Test Method.