Superabsorbent Polymer Selection for Rapid Absorption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing absorbent articles with superabsorbent polymer particles face challenges in achieving fast liquid acquisition at the initial contact with body exudates, leading to potential leakage due to poor permeability and absorption speed, especially at the first gush.
Innovation Solution
The absorbent article is designed with a core comprising at least 90% superabsorbent polymer particles, optimized for rapid liquid uptake by requiring a time to reach 20 g/g of less than 240 seconds, and featuring a thermoplastic adhesive material to enhance permeability and immobilization, reducing the risk of gel blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If superabsorbent polymer particles with high FSR and high SFC values are used, then absorption speed and permeability are improved, but fast acquisition time at first gush is not achieved
Solution Approach 1:
The patent changes the characterization parameter from FSR (Free Swell Rate) and SFC (Saline Flow Conductivity) to T20 (time to reach 20 g/g uptake). This parameter change reveals that particles need to meet a specific time criterion (T20 < 240 s) to ensure fast acquisition at first gush, resolving the contradiction by providing a more accurate performance metric that directly correlates with initial absorption speed reliability
2Quantity of substance
If superabsorbent polymer particles are used to absorb liquid exudates, then absorption capacity is improved, but gel blocking occurs reducing permeability
Solution Approach 1:
The patent applies preliminary action by pre-selecting superabsorbent polymer particles that meet specific T20 criteria before they are used in the absorbent article. This preliminary selection ensures that the particles will not cause gel blocking issues during actual use, as their fast acquisition capability is verified in advance through the T20 measurement protocol
3Ease of manufacture
If conventional superabsorbent polymer particles are used, then manufacturing simplicity is maintained, but leakage occurs due to poor initial absorption
Solution Approach 1:
The patent introduces a new selection parameter T20 (time to reach 20 g/g uptake) that directly correlates with leakage prevention. By changing the selection criterion from traditional FSR/SFC to T20, the patent enables manufacturers to easily identify and select particles that prevent leakage without complicating the manufacturing process, as the T20 measurement provides a clear, actionable specification
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 absorption properties and reduces leakage by ensuring fast acquisition of liquid exudates, even at the initial contact, maintaining effective absorption throughout the swelling process.
Implementation Method 1
Superabsorbent polymer particles are able to absorb liquid and swell when entering into contact with liquid exudates
Implementation Method 2
The superabsorbent polymer particles need first to be able to absorb the liquid exudates fast. The absorption speed of superabsorbent polymer particles has generally been characterized in the prior art by measuring the Free Swell Rate (FSR) of the particles
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An absorbent article such as disposable diaper, training pant, and adult incontinence undergarment comprising superabsorbent polymer particles able to absorb and contain body exudates having improved absorption properties and therefore reduce leakage, especially at the first gush, i.e. when the article starts to be wetted.