Absorbent Structure With Permanent Channels For Flexibility
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Solution Overview
Problem
Disposable absorbent articles, such as diapers, face challenges in maintaining flexibility and fit, especially when partially or fully loaded with bodily fluids, due to increased stiffness in regions with high absorbent capacity, which affects their ability to conform to the body.
Innovation Solution
Incorporating permanent channels free of superabsorbent polymer material within the absorbent structure, supported by a supporting sheet and immobilized using adhesive materials, to enhance liquid transport and maintain performance while reducing the overall amount of absorbent material used.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the amount of superabsorbent polymer material is increased to improve absorbent capacity, then the absorbent performance is improved, but the stiffness of the absorbent article increases and flexibility is reduced
Solution Approach 1:
The absorbent core is segmented into multiple zones with different absorbent material distributions. High-capacity zones contain more superabsorbent polymer material for maximum absorption, while low-capacity zones contain less material to maintain flexibility. This segmentation allows the article to achieve high overall absorbent capacity while preserving flexibility in regions where full absorption capacity is not required.
2Quantity of substance
If superabsorbent polymer material is distributed uniformly throughout the absorbent core, then the absorbent capacity is maximized, but the liquid transport speed is reduced due to lack of dedicated transport pathways
Solution Approach 1:
A hydrophilic binder layer is introduced as an intermediary component between the superabsorbent polymer particles and the external environment. This binder layer acts as a dedicated liquid transport pathway that facilitates rapid liquid acquisition and distribution throughout the absorbent core. The binder layer's hydrophilic properties enable it to wick and transport liquid efficiently, while the superabsorbent polymer particles embedded within it provide absorption capacity. This intermediary structure resolves the contradiction by providing both fast transport (through the binder network) and high capacity (through the polymer particles).
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 provides improved flexibility and liquid handling properties, preventing leakage and maintaining absorbent performance even when wet, by maintaining the integrity of channels and ensuring the absorbent material remains in place, thus enhancing fit and fluid absorption.
Implementation Method 1
comprises one or more adhesive material to at least partially immobilize said absorbent material onto said supporting sheet
Implementation Method 2
an absorbent material (50) that contains at least a superabsorbent polymer material
Implementation Method 3
superabsorbent polymer material, such as hydrogel-forming polymer material, also referred to as absorbent gelling material, AGM, or super-absorbent polymer, SAP
Implementation Method 4
having first and a second substantially longitudinal channels that are free of said superabsorbent polymeric particles
Data Source
AI summary
A method of making an absorbent structure is provided. The method contains the steps of placing a supporting sheet onto raised portions with a shape and dimensions corresponding to first and second channels, depositing absorbent material onto the supporting sheet, and applying a pressure to the supporting sheet of the absorbent structure, the pressure being applied selectively to the portions of the supporting sheet that correspond to the channels.