Patterned Adhesive Absorbent Core for Menses Retention
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Solution Overview
Problem
Existing absorbent cores for feminine hygiene products face challenges in improving absorption and retention of menses, which differ from urine in surface tension and flowability, while maintaining integrity and comfort.
Innovation Solution
The absorbent core comprises a cover layer, a substrate layer, thermoplastic adhesive, and auxiliary adhesives, with the thermoplastic adhesive applied in microfiber form to immobilize superabsorbent polymer particles, and auxiliary adhesives applied in a pattern to balance fluid passage and integrity, optimizing absorption and retention properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If thermoplastic adhesive is applied in microfiber form to immobilize superabsorbent polymer particles, then the structural integrity is improved, but the fluid acquisition and absorption properties deteriorate
Solution Approach 1:
The adhesive is applied in a pattern rather than uniformly across the entire surface, creating zones of different adhesive concentration. This allows certain areas to maintain high fluid accessibility while other areas provide structural reinforcement, resolving the contradiction between integrity and fluid acquisition.
Solution Approach 2:
Instead of applying adhesive uniformly to maximize immobilization, the invention applies adhesive partially in a patterned distribution. This partial application provides sufficient structural integrity while leaving portions of the superabsorbent polymer particles exposed for optimal fluid contact and absorption.
2Strength
If adhesive amount is increased to improve integrity, then structural integrity is improved, but fluid handling capacity deteriorates
Solution Approach 1:
The patterned adhesive application creates local variations in adhesive density, with higher concentrations in areas requiring structural support and lower concentrations in areas requiring fluid access. This spatial differentiation resolves the trade-off between strength and fluid handling capacity.
Solution Approach 2:
The adhesive layer is segmented into discrete patterned regions rather than forming a continuous film. This segmentation allows the structure to maintain integrity at adhesive locations while preserving fluid handling capacity in non-adhesive regions.
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 enhances the absorbent core's ability to quickly absorb menses while maintaining structural integrity and comfort, improving fluid handling capacity and integrity without compromising on fluid acquisition and absorption.
Implementation Method 1
a layer of a thermoplastic adhesive, in particular in the form of microfibers, which is at least partially in contact with the first surface of the layer of super absorbent polymer particles
Implementation Method 2
super absorbent polymer materials which are capable of absorbing large quantities of liquids and of retaining such absorbed liquids under moderate pressure
Implementation Method 3
water-insoluble, water-swellable, hydrogel-forming crosslinked absorbent polymers
Implementation Method 4
thermoplastic adhesive, in particular in the form of microfibers
Data Source
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AI summary
An absorbent core comprising super absorbent polymer particles and a pattern of adhesive for use in disposable absorbent articles, for example for the absorption of menses or blood.