Multilayer Absorbent Body Structure for Fast Uptake and Low Re-Wet
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Solution Overview
Problem
Existing absorbent articles struggle to achieve both high absorption rates and low re-wet amounts, particularly in multilayer absorbers.
Innovation Solution
A multilayer absorber design comprising a first water absorption layer with water-absorbent resin particles having a water retention capacity of 32 to 80 g/g and a one-minute lockup height of 1.6 cm or less, and a second layer with resin particles having a higher lockup height, combined with specific mass and layer content ratios, to enhance absorption performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a multilayer absorber is used to increase absorption capacity, then the absorption rate is improved, but the re-wet amount increases
Solution Approach 1:
The absorber is divided into multiple water absorption layers, each containing water-absorbent resin particles with different lockup height characteristics. The first layer has particles with lockup height of 1.6 cm or less for rapid absorption, while the second layer has particles with lockup height of more than 1.6 cm for sustained absorption, effectively segmenting the absorption function to reduce re-wetting.
Solution Approach 2:
Different regions of the absorber have different local qualities through the use of water-absorbent resin particles with different lockup heights in different layers. The first water absorption layer uses particles with lower lockup height for rapid liquid uptake near the skin contact side, while the second layer uses particles with higher lockup height for maintaining absorption capacity further from the skin, creating localized functional differentiation.
2Quantity of substance
If water-absorbent resin particles with high water retention capacity are used, then the absorption capacity is improved, but the lockup height increases causing slow absorption rate
Solution Approach 1:
The water absorption function is segmented across two layers with different particle characteristics. The first layer uses particles with lockup height of 1.6 cm or less for rapid initial absorption, while the second layer uses particles with lockup height of more than 1.6 cm for sustained absorption, allowing each layer to optimize for different aspects of absorption performance.
Solution Approach 2:
The invention changes the lockup height parameter of the water-absorbent resin particles between the two layers. The first layer particles have lockup height of 1.6 cm or less (faster absorption), while the second layer particles have lockup height of more than 1.6 cm (slower, sustained absorption), creating a gradient in absorption rate parameters throughout the absorber structure.
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 multilayer absorber achieves both high absorption rates and low re-wet amounts, effectively addressing the limitations of previous designs.
Implementation Method 1
water-absorbent resin particles (I) having a water retention capacity of physiological saline of 32 to 80 g/g
Implementation Method 2
water-absorbent resin particles (II) having a one-minute value of a lockup height of more than 1.6 cm
Data Source
AI summary
The present invention relates to an absorber including a first water absorption layer, and a second water absorption layer laminated on the first water absorption layer, in which the first water absorption layer contains water-absorbent resin particles (I) having a water retention capacity of physiological saline of 32 to 80 g/g and a one-minute value of a lockup height of 1.6 cm or less, and the second water absorption layer contains water-absorbent resin particles (II) having a one-minute value of a lockup height of more than 1.6 cm.