Fiberized Net Adhesive for Absorbent Core Stability
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Solution Overview
Problem
There is a need for absorbent core adhesives with a high storage modulus (G′) to maintain mechanical stability while avoiding stiffness, particularly in disposable absorbent articles, where traditional adhesives may be too dense and stiff, affecting the absorbency and comfort of the products.
Innovation Solution
A fiberized net structure with a storage modulus greater than 1.2×106 Pa is used, comprising a thermoplastic composition that acts as both a fiberized net and a hot melt adhesive, immobilizing superabsorbent polymer material and providing improved wet immobilization without excessive compressive forces, allowing for flexibility and comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If traditional adhesives are used in absorbent core structures, then mechanical stability is maintained, but the adhesive becomes too dense and stiff, reducing absorbency and comfort
Solution Approach 1:
The patent applies parameter changes by modifying the storage modulus (G′) of the fiberized net structure to be greater than 1.2×10^6 Pa at 21°C. This specific parameter change allows the adhesive to maintain mechanical stability while reducing stiffness, thereby resolving the contradiction between strength and harmful stiffness that affects absorbency and comfort
Solution Approach 2:
The patent uses a fiberized net structure that combines thermoplastic composition with specific mechanical properties (G′ > 1.2×10^6 Pa) to create a composite material system. This composite structure provides both the necessary mechanical stability and reduced stiffness, eliminating the need for traditional dense adhesives that caused harmful stiffness
2Productivity
If the absorbent core structure is made thinner to reduce material usage, then productivity and cost are improved, but mechanical stability becomes compromised
Solution Approach 1:
By specifying a minimum storage modulus (G′ > 1.2×10^6 Pa) for the fiberized net structure, the patent enables thinner absorbent core structures to maintain adequate mechanical stability. The enhanced stiffness parameter compensates for reduced thickness, allowing productivity improvement without sacrificing structural integrity
Solution Approach 2:
The fiberized net structure provides localized mechanical support within the absorbent core, concentrating stability functions in specific regions. This allows the overall core structure to be thinner while maintaining necessary mechanical properties where most critical
3Object-affected harmful factors
If channels are added to reduce stiffness and improve liquid transport, then absorbency is improved, but the structure becomes more complex
Solution Approach 1:
The fiberized net structure with G′ > 1.2×10^6 Pa serves multiple functions simultaneously: it provides mechanical stability, controls stiffness, and facilitates liquid transport through its network structure. This multi-functionality eliminates the need for separate channel structures, improving absorbency while maintaining structural simplicity
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 achieves enhanced absorbency and comfort by maintaining the absorbent material's integrity and reducing stiffness, allowing for efficient liquid transport and absorbency while ensuring the adhesive's stability and flexibility, even under wet conditions.
Implementation Method 1
a fiberized net structure to at least partially immobilize said absorbent layer onto said first substrate
Implementation Method 2
This absorbent polymer material ensures that large amounts of bodily fluids, e.g. urine, can be absorbed by the absorbent article during its use
Data Source
AI summary
An absorbent structure for an absorbent article, comprising a first substrate and an absorbent layer supported thereon, said absorbent layer comprising an absorbent material comprising a superabsorbent polymer material; wherein said absorbent structure comprises a fiberized net structure to at least partially immobilize said absorbent layer onto said first substrate, and whereby said fiberized net structure has a storage modulus (G′) at 21° C. of greater than about 1.2×106 Pa.