Absorber Core Diffusion Area Ratio for Absorption Rate
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Solution Overview
Problem
Absorbers in absorbent articles, such as diapers, face challenges in maintaining a high absorption rate while minimizing the frequency of replacement and environmental impact, as the absorption rate tends to decrease with increased use proportion of fibrous materials.
Innovation Solution
An absorber core with water-absorbent resin particles is designed, where a diffusion area change ratio of 0.80 to 1.0 is maintained by optimizing the content of water-absorbent resin particles and fibrous material, using a combination of water-absorbent resin particles A and B with specific water absorption rates and retention capacities, and incorporating a water-insoluble coating layer, to enhance absorption efficiency and prevent leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the use proportion of water-absorbent resin particles is increased to improve absorption capacity, then the absorption capacity is improved, but the absorption rate tends to decrease
Solution Approach 1:
The patent applies local quality by creating regions with different resin particle characteristics within the absorber. Specifically, it uses a mixture of resin particles with different water absorption rates (fast-absorbing particles and slow-absorbing particles) and different retention capacities, allowing different parts of the absorber to perform different functions - some regions prioritize rapid absorption while others maintain sustained absorption capacity.
Solution Approach 2:
The patent employs composite materials by combining water-absorbent resin particles with different properties (different absorption rates and retention capacities) into a single absorber system. This composite approach allows the absorber to simultaneously achieve high absorption capacity and maintain good absorption rate by leveraging the complementary characteristics of different particle types.
2Loss of substance
If the absorber is made thinner to reduce material usage, then material usage is reduced, but the absorption rate decreases
Solution Approach 1:
The patent applies parameter changes by optimizing the physical and chemical parameters of the resin particles, including their size distribution, absorption rate characteristics, and retention capacity. By carefully selecting and mixing particles with different parameter values, the patent achieves high absorption performance in a thinner absorber structure, eliminating the need for thicker designs to maintain absorption rate.
3Reliability
If the content of water-absorbent resin particles is increased to improve absorption performance, then absorption performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies segmentation by dividing the water-absorbent resin component into multiple segments or types with different functional characteristics. Instead of using a single type of resin particle throughout, the patent segments the resin system into particles with different absorption rates and retention capacities, allowing optimized performance at reduced overall resin content, thereby lowering manufacturing cost while maintaining absorption performance.
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 absorber achieves a better absorption rate and reduced leakage, allowing for extended use and lower replacement frequencies, thereby reducing consumer burden and environmental impact.
Implementation Method 1
an absorber core containing water-absorbent resin particles
Implementation Method 2
water-absorbent resin particles having a particle diameter that enables them to be suitably used for absorbent articles
Implementation Method 3
the water absorption rate of physiological saline and water retention capacity
Data Source
AI summary
The present invention relates to an absorber containing an absorber core having water-absorbent resin particles, in which a diffusion area change ratio measured in the order of (1) to (5) is 0.80 to 1.0.